CN111303532A - Light-transmitting/light-absorbing assembly of laser welding polypropylene material and preparation method thereof - Google Patents
Light-transmitting/light-absorbing assembly of laser welding polypropylene material and preparation method thereof Download PDFInfo
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- CN111303532A CN111303532A CN201911362890.XA CN201911362890A CN111303532A CN 111303532 A CN111303532 A CN 111303532A CN 201911362890 A CN201911362890 A CN 201911362890A CN 111303532 A CN111303532 A CN 111303532A
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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Abstract
The invention discloses a light-transmitting/light-absorbing assembly of a laser welding polypropylene material and a preparation method thereof, wherein the laser welding assembly is divided into a light-transmitting component and a light-absorbing component, and the light-transmitting component comprises the following components in percentage by mass: a light-transmitting component: 46.9-99.5% of high-light-transmittance polypropylene; nucleating agent: 0 to 1 percent; a toughening agent: 0 to 20 percent; 0-30% of filler; 10100.1-0.3% of antioxidant; 0.1-0.3% of antioxidant DSTP; 1680.1-0.3% of antioxidant; 70720.1-0.5% of an auxiliary agent; 0.1-0.5% of auxiliary agent-CaST; light absorbing component: 44.1-99.5% of polypropylene; 0-20% of a toughening agent; 0-30% of filler; 0-2% of a laser absorber; 10100.1-0.3% of antioxidant; 0.1-0.3% of antioxidant DSTP; 1680.1-0.3% of antioxidant; 70720.1-0.5% of an auxiliary agent; 0.1-0.5% of auxiliary agent-CaST; 0-2% of toner; the polypropylene material can meet the requirements of laser welding on the material, and is beneficial to the wider application of the polypropylene material in more fields.
Description
Technical Field
The invention relates to a preparation method of a laser welding polypropylene material, wherein polypropylene is welded in the using process as an important processing method, and laser welding is a welding method which is increasingly applied.
Background
The polypropylene is a general plastic with the highest market share at present, the polypropylene has the advantages of light weight, no odor, no toxicity, transparency or translucency, generally the molecular weight of the polypropylene is between 8 and 15 ten thousands, good formability, easy coloring, low water absorption, good chemical stability, excellent electrical insulation performance and the like, the polypropylene material is widely applied, and the polypropylene material is mainly divided into the following parts according to the difference of forming processes: 1. the film products and the forming mode of polypropylene used for the film products can be divided into: blown film, cast film and biaxially oriented film; 2. injection molding of the product: the common injection molding polypropylene is widely applied in the fields of automobiles, electrical appliances, machinery, instruments, daily necessities, building materials and the like; 3. the PP material of the extrusion molded product is generally applied to pipes, fibers, sheets and the like in a wide range, and in addition, the PP material can also be used in the fields of laminates, synthetic papers and the like.
Welding is one of the main methods for secondary processing of plastics, and aims at thermoplastic plastics, and by means of the characteristic that thermoplastic plastics are heated and melted, the surfaces of two plastic parts are simultaneously heated and melted, so that the two parts are integrated under the action of external force, and the welding is called as welding. Plastic welding can be classified into hot plate welding, induction welding, high-frequency welding, hot air welding, extrusion welding, friction welding, ultrasonic welding, and the like, according to the heating manner.
The laser has the advantages of good directivity, good monochromaticity, good coherence, energy concentration, large pulse instantaneous power and the like, and the laser welding is a processing method developed in recent years and influences the main factors of the laser welding: the laser welding requires that the upper layer is laser penetrating layer plastic and the lower layer is light absorbing plastic; the polypropylene material is used as a universal plastic which is most widely applied, and is less applied as a laser welding material at present, mainly because the polypropylene material is used as a light-transmitting layer material, the light transmittance is not enough, the polypropylene material is used as a light absorption layer, except for a black (carbon black) material, the light absorption efficiency of other materials is poor, and other factors are adopted, the defects of the polypropylene material as a light-transmitting and light-absorbing material are overcome, and the polypropylene material meets the requirements of laser welding on the materials, and has important significance on a secondary processing method for enriching the polypropylene material.
Disclosure of Invention
The invention provides a laser welding polypropylene material light-transmitting/light-absorbing assembly and a preparation method thereof, which increase the laser penetration capability of light-transmitting components and the laser absorption efficiency of light-absorbing components by material selection and formula design, and related additives are transparent liquid, which do not influence the color matching of polypropylene materials.
In order to solve the technical problems, the invention adopts the technical scheme that:
a laser welding polypropylene material light transmission/absorption assembly and a preparation method thereof comprise the following raw materials by weight percent:
a light-transmitting component:
light absorbing component:
the high-light-transmission polypropylene is a random copolymerization polypropylene material, the molecular chain regularity is poor, the crystallinity is low, the light transmission is high, and the melt index is 5-60g/10min (230 ℃, 2.16 kg).
The polypropylene can be homopolymerized polypropylene or polypropylene, and the melt index is 5-60g/10min (230 ℃, 2.16 kg).
The filling minerals can be talc powder, barium sulfate, wollastonite, whisker and other minerals, and the mesh number is 1000-10000 meshes.
The nucleating agent is a silica nucleating agent which is subjected to nano coating treatment, has high nucleating efficiency and is beneficial to the formation of small crystal grains by polypropylene materials.
The antioxidant is a mixture of 1010/DSTP/168/7072.
The toner may be an inorganic toner, a dye or a pigment.
The toughening agent is ethylene-octene copolymer (POE), and can effectively increase the toughness of the polypropylene material.
The laser absorbent is a nano-scale liquid material, and can effectively absorb the wavelength range near the near infrared (wavelength absorption range: 850-1250nm, peak 1050 nm). Has the advantages of low addition amount, high absorption efficiency, no absorption to visible light, little influence on product color and the like.
The invention provides a laser welding polypropylene material light-transmitting/light-absorbing assembly and a preparation method thereof, wherein the laser welding polypropylene material light-transmitting/light-absorbing assembly comprises the following steps:
a light-transmitting component:
weighing high-light-transmittance polypropylene, a toughening agent, a nucleating agent, an antioxidant 1010, an antioxidant DSTP, an antioxidant 168, an auxiliary agent-7072 and an auxiliary agent-CAST according to a formula ratio; uniformly mixing the components by a high-speed stirrer for later use; and taking the filling minerals according to the formula proportion for later use.
(2) And adding the mixed raw materials into a double-screw extruder through a main feeding port, adding filling minerals through a side feeding port, and performing melt extrusion, granulation, drying treatment and other processes to obtain the light-transmitting component polypropylene material.
Light absorbing component:
(1) weighing polypropylene, a toughening agent, a filler mineral, a laser absorbent, an antioxidant 1010, an antioxidant DSTP, an antioxidant 168, an auxiliary agent-7072, an auxiliary agent-CaST and toner according to a formula ratio; uniformly mixing the components by a high-speed stirrer for later use; the filling minerals are taken according to the formula proportion for standby.
(2) And adding the mixed raw materials into a double-screw extruder through a main feeding port, adding filling minerals through a side feeding port, and performing melt extrusion, granulation, drying treatment and other processes to obtain the light absorption component polypropylene material.
Compared with the prior art, the invention has the advantages that: laser welding is increasingly used as a secondary processing method of thermoplastic plastics, and the market meets the requirement that a polypropylene material for laser welding is almost blank. The transparent laser absorbent is introduced into the formula of the material for absorbing the light-absorbing component, so that the laser can be absorbed, and the additive has small influence on the color, so that polypropylene with different colors can meet the requirements of the light-absorbing component.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer, the present invention will be described in further detail with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The specific embodiment of the invention selects the following materials:
random copolymerized polypropylene A (PP-A), PP673K, SABIC
Random copolymer Polypropylene B (PP-B), 25MF1, SABIC
Polypropylene resin 1 (PP-1): melt index 10, test conditions 230 ℃ 2.16 kg;
polypropylene resin 2 (PP-2): melt index 50, test conditions 230 ℃ 2.16 kg;
talc powder: 3000 mesh, commercially available;
a toughening agent: POE-168, commercially available;
antioxidant 1010: hindered phenolic antioxidants, CIBA, switzerland;
β' -thiodipropionic acid distearate, a commercial antioxidant DSTP;
antioxidant 168: phosphite antioxidants, commercially available;
auxiliary agent-7072: henscman chemical engineering;
auxiliary agent calcium stearate CaST: is sold on the market;
carbon black master batch 2014, cabot
Nucleating agent: NanOsil ASD, Energy Strategy Associates Inc.
Laser light absorber OMNISTAB NIR, I.C.G. Specialty Chemical Group
The product performance testing method comprises the following steps:
tensile property: according to ISO 527 method, spline size: 170 × 10 × 4mm, speed 50 mm/min.
Notched impact strength: according to ISO 179 method, spline size: 80 x 10 x 4 mm.
Combustion residue: ISO 3451 method.
Total light transmittance: according to ISO 13468 method, spline size: 60 x 2 mm.
Welding strength: and (3) welding the light absorbing layer and the light transmitting layer polypropylene sample sheet (100X 25X 3.2mm), carrying out tensile test on the welded sample sheet, and adopting a universal material testing machine, wherein the testing speed is 50mm/min, and the breaking strength is the welding strength.
Example 1:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 80g of nucleating agent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.8 kg of PP-21.5 kg of PP, 1.4kg of POE, 200g of laser absorbent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Example 2:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 80g of nucleating agent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.7 kg of PP-21.5 kg of PP, 1.4kg of POE, 100g of toner-carbon black, 200g of laser absorbent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product. .
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Example 3:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 80g of nucleating agent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing PP-14.7 kg, PP-21.5 kg, POE 1.4kg, toner-titanium dioxide powder 100g, laser absorbent 200g, antioxidant 101010 g, antioxidant DSTP 10g and antioxidant 16820 g; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Example 4:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 80g of nucleating agent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.7 kg of PP-21.5 kg of PP, 1.4kg of POE, 100g of toner-ferric oxide, 200g of laser absorbent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Example 5:
light-transmitting component
Weighing 3.5kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.8 kg of PP-21.5 kg of PP, 1.4kg of POE, 200g of laser absorbent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Comparative example 1:
light-transmitting component
Weighing 13.42 kg of PP-23.0 kg of PP, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.8 kg of PP-21.5 kg of PP, 1.4kg of POE, 200g of laser absorbent, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Comparative example 2:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 15.0 kg of PP-21.5 kg of PP, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Comparative example 3:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.9 kg of PP-21.5 kg of PP, 1.4kg of POE, 100g of toner-carbon black, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Comparative example 4:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing PP-14.9 kg, PP-21.5 kg, POE 1.4kg, toner-titanium dioxide powder 100g, antioxidant 101010 g, antioxidant DSTP 10g and antioxidant 16820 g; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer polypropylene sample sheets (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in Table 1.
Comparative example 5:
light-transmitting component
Weighing 3.42kg of PP-A, 3.0kg of PP-B, 1.4kg of POE, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
Light absorbing component
Weighing 14.9 kg of PP-21.5 kg of PP, 1.4kg of POE, 100g of toner-ferric oxide, 101010 g of antioxidant, 10g of antioxidant DSTP and 16820 g of antioxidant; assistant-calcium stearate 10g, assistant-707250 g, polar additive 840R: 200g of black masterbatch 2014100 g; uniformly mixing in a high-speed stirrer to obtain a mixture for later use; weighing 2.0kg of talcum powder for later use
The above mixture was fed through the main feed port into a twin screw extruder (extruder length to diameter ratio L/D36, screw diameter 35mm) with controlled temperatures (from feed port to head outlet) at each stage of the twin screw extruder of 160 ℃, 180 ℃, 210 ℃, 215 ℃,220 ℃,220 ℃,225 ℃,230 ℃ by side feed. The rotating speed of the main screw is 450-550 r/min, and the temperature of the water tank is 20-50 ℃. And cooling the extruded material strips by a water tank, drying by a blast drier, and granulating to obtain the product.
The above materials were dried in a forced air drying cabinet at 100 ℃ for 2h and then injection molded into standard bars at a temperature of 230 ℃. Testing the injection-molded mechanical property sample strips after the state is adjusted for 24 hours in a standard laboratory environment (23 ℃ and 50% RH), welding the light-absorbing layer and the light-transmitting layer nylon sample strips (100 × 25 × 3.2mm), and performing a tensile test on the welded sample strips to represent the welding strength, wherein the test results are shown in tables 1 and 2.
Table 1: results of the performance tests of examples 1-5.
Table 2: results of the performance test of comparative examples 1 to 5.
As can be seen from the data in tables 1 and 2, the light transmittance can be effectively increased by selecting high-light-transmittance polypropylene as the light-transmittance component, and further the laser welding strength is increased, the nucleating agent can slightly increase the light transmittance by reducing the reflection of light due to the reduction of the grain size of crystal grains, the light absorption agent can effectively absorb laser and increase the welding strength, the efficiency of the nucleating agent is far higher than that of conventional toner such as carbon black, the laser absorption agent is transparent and does not influence the color matching of polypropylene materials, and the polypropylene materials with different colors can be used as the light absorption component.
Claims (10)
1. A laser welding polypropylene material light transmission/absorption assembly and a preparation method thereof are characterized in that: the composite material comprises the following raw materials in percentage by weight:
the light-transmitting component is:
the light absorption component is:
2. the light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the high-light-transmission polypropylene is a random copolymerization polypropylene material, the molecular chain regularity is poor, the crystallinity is low, the light transmission is high, and the melt index is 5-60g/10min (230 ℃, 2.16 kg).
3. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the polypropylene can be homopolymerized polypropylene or polypropylene, and the melt index is 5-60g/10min (230 ℃, 2.16 kg).
4. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the toughening agent is ethylene-octene copolymer (POE), and can effectively increase the toughness of the polypropylene material.
5. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the filling minerals can be talc powder, barium sulfate, wollastonite, whisker and other minerals, and the mesh number is 1000-10000 meshes.
6. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the nucleating agent is a silica nucleating agent which is subjected to nano coating treatment, has high nucleating efficiency and is beneficial to the formation of small crystal grains by polypropylene materials.
7. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the antioxidant is a mixture of 1010/DSTP/168/7072.
8. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the toner may be an inorganic toner, a dye or a pigment.
9. The light-transmitting/light-absorbing assembly of laser-welded polypropylene material and the preparation method thereof as claimed in claim 1, wherein: the laser absorbent is a nano-scale liquid material, and can effectively absorb the wavelength range near the near infrared (wavelength absorption range: 850-1250nm, peak 1050 nm). Has the advantages of low addition amount, high absorption efficiency, no absorption to visible light, little influence on product color and the like.
10. A laser-welded polypropylene light transmitting/absorbing assembly and a method for its preparation according to any one of claims 1 to 9, wherein: the method comprises the following steps:
a light-transmitting component:
weighing high-light-transmittance polypropylene, a toughening agent, a nucleating agent, an antioxidant 1010, an antioxidant DSTP, an antioxidant 168, an auxiliary agent-7072 and an auxiliary agent-CAST according to a formula ratio; uniformly mixing the components by a high-speed stirrer for later use; and taking the filling minerals according to the formula proportion for later use.
(2) Adding the mixed raw materials into a double-screw extruder through a main feeding port, adding filling minerals through a side feeding port, and performing melt extrusion, granulation, drying and other processes to obtain the light-transmitting component polypropylene material;
light absorbing component:
(1) weighing polypropylene, a toughening agent, a filler mineral, a laser absorbent, an antioxidant 1010, an antioxidant DSTP, an antioxidant 168, an auxiliary agent-7072, an auxiliary agent-CaST and toner according to a formula ratio; uniformly mixing the components by a high-speed stirrer for later use; weighing the filling minerals according to the formula proportion for later use;
(2) and adding the mixed raw materials into a double-screw extruder through a main feeding port, adding filling minerals through a side feeding port, and performing melt extrusion, granulation, drying treatment and other processes to obtain the light absorption component polypropylene material.
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