CN1105742C - Special material for modifying PP-R plastics and its preparing process - Google Patents

Abstract

The invention relates to a PP-R plastic special material modified by engineering plastics and a preparation method thereof. The modified PP-R plastic special material of the present invention comprises 50-75 parts of PP-R resin and 10 parts of engineering plastics in parts by weight. -30 parts, 1-10 parts of compatibilizer, 0.5-3 parts of lubricant, 7-20 parts of high melting point polypropylene and 1-5 parts of active nanomaterials can also be added. The preparation method includes mixing, cooling and granulation 1. Cooling and cutting four steps, the plastic products made of the modified PP-R plastic special material of the present invention have high temperature resistance, high strength, fatigue resistance and long service life.

Description

Modified PP-R plastic special material

The invention relates to a PP-R plastic special material modified by engineering plastics.

PP-R currently used at home and abroad is a non-toxic, hygienic new polymer chemical material, which is the third type of PP-R, which is the third generation product after the second type of PP-R. The method makes ethylene and propylene randomly polymerized in the molecular chain, but due to the characteristics of its own molecular structure, the use temperature range is narrow. When the temperature rises to the glass transition temperature Tg, the volume of the interstitial space between the molecular chains begins to expand, and the main chain The rotation barrier within the single bond suddenly decreases, the chain segment begins to move, and the polymer begins to change its phase state. At this time, under the action of pressure, as long as the temperature increases by a few degrees, the deformation value suddenly increases dozens of times, and the modulus decreases by 3- 4 orders of magnitude. If the temperature continues to rise, the thermal kinetic energy of the polymer and the volume of the inter-molecular voids can reach the relative displacement movement of the chain segments relatively freely. At this time, the PP-R plastic is already in a highly elastic state. If the plastic product is under pressure or tensile force, the chain segment will undergo a relatively larger displacement movement, causing the polymer chain to change from a curled conformation to an extended conformation. . Macroscopically, the deformation is large, the modulus is small, and it will relax after a long time. Therefore, the plastic products made of PP-R plastic at home and abroad have a maximum service temperature of 90-95°C, and a short-term use of 110°C. At present, the state expressly stipulates that galvanized pipes will be phased out, and the best alternative product is PP-R plastic pipes. In fact, the temperature of boiling water, boiler steam, and hot springs is sometimes much higher than 95°C, and long-term use cannot meet this requirement.

The purpose of the present invention is to improve the deficiencies of the above-mentioned prior art, and provide a modified PP-R plastic special material with high temperature resistance, high strength, fatigue resistance and long service life.

In order to achieve the above object, the present invention is achieved in this way: modified PP-R plastic special material, by weight, includes 50-75 parts of PP-R resin, 10-30 parts of engineering plastics, 1-10 parts of compatibilizer, Lubricant 0.5-3 parts.

The preferred version of the modified PP-R plastic special material of the present invention includes 55-70 parts of PP-R resin, 12-25 parts of engineering plastics, 3-8 parts of compatibilizer, and 0.5-2.5 parts of lubricant by weight. .

The best solution of the modified PP-R plastic special material of the present invention comprises 67 parts of PP-R resin, 15.5 parts of engineering plastics, 6.8 parts of compatibilizer and 0.65 parts of lubricant in parts by weight.

The modified PP-R plastic special material of the present invention, the engineering plastics are polyoxymethylene, polyamide, polycarbonate, polyamide-polyphenylene ether blend, polyamide/styrene-maleic anhydride copolymer Polyphenylene ether blends, polyphenylene ether-polyamide blends, polyamide/styrene-maleic anhydride copolymers, and polyesters can be used alone or in combination of any two or more; The compatibilizer is ethylene-acrylate copolymer, methacrylate-styrene-butadiene elastomer graft copolymer, ethylene-vinyl acetate copolymer, EPDM (product code), maleic anhydride grafted polyolefin copolymer Commodity, product code C803 produced in the United States, product code HTNA01 produced in Japan, can be used alone or in combination of any two or more; the lubricant is polyethylene wax, stearic acid, stearic acid alone Glycerides can be used alone or in combination of any two or more.

The modified PP-R plastic special material of the present invention can also add 7-20 parts of high melting point polypropylene.

In addition, 1-5 parts of active nanomaterials can also be added to the modified PP-R plastic special material of the present invention.

The modified PP-R plastic special material of the present invention can simultaneously add 7-20 parts of high melting point polypropylene and 1-5 parts of active nanomaterials.

In the modified PP-R plastic special material of the present invention, the active nanomaterials are silicon dioxide, titanium dioxide and calcium carbonate.

Modified PP-R plastic special material of the present invention, its preparation method comprises the following steps successively:

a. Mixing: After mixing various powdery raw materials, add them to a high-speed mixer and stir to 60-100°C;

b. Cooling: automatically discharge the above-mentioned mixture into the cold mixer, cool to 20-40°C, and set aside;

c, granulation: put the prepared material into the granulator, and extrude to granulate;

d. Cooling and granulation: the temperature of cold cutting water is 20-45°C; after granulation, it becomes a special material for modified PP-R plastics; the barrel temperature of the granulator during the granulation process is: conveying section: 180-195°C; compression Section: 190-195°C; melting section: 190-195°C; metering section: 190-198°C; head temperature: head body 190-210°C; die: 190-255°C.

The modified PP-R plastic special material of the present invention uses engineering plastics to modify PP-R resin to form an intricate molecular conformation, and the molecular chains are entangled with each other to reduce stress concentration, reduce orientation, and balance vertically and horizontally. , so that the heat resistance, strength, fatigue resistance and service life of the modified PP-R plastic are improved.

Compared with the prior art, the modified PP-R plastic special material of the present invention has a positive effect. Using conventional testing tools and means for plastic products, it is measured that the pipe made of the modified PP-R plastic special material has the highest service life. The temperature is 100-123.5°C, which is 10-28.5°C higher than the current maximum use temperature of 90-95°C PP-R plastic; the short-term use temperature is 125-131.8°C, which is 15-21.8°C higher than the current PP-R plastic; Tensile strength ≥ 29MPa, 3-6MPa greater than the current PP-R plastic tensile strength; at 0°C, the impact test is 28J, higher than the current PP-R plastic 15J; in addition, its Shore hardness > 75, Rockwell hardness >65, flexural modulus >885MPa, flexural stress >33.5MPa, tensile modulus >818MPa.

For better understanding and implementation, the present invention will be described in detail below in conjunction with the examples.

Example 1, after preparing 67Kg of PP-R resin (RA130E), 15.5Kg of polyoxymethylene, 6.8Kg of ethylene-acrylate copolymer, and 0.65Kg of polyethylene wax, add it to a high-speed mixer and stir until the temperature is 80°C. It is automatically discharged into the cold mixer, cooled to 30°C, and then added to the granulator whose temperature has been set. The barrel temperature of the granulator is: conveying section: 185°C; compression section: 190°C; melting section: 192 ℃; metering section: 194°C; head temperature: head body 195°C; die: 220°C, extruded and granulated, then cooled and pelletized, the temperature of the cold cutting water is 30°C, and it becomes modified PP after pelletizing -R plastic special material.

Embodiment 2, with PP-R resin (RA130E) 50Kg, polyamide/styrene-maleic anhydride copolymer 10Kg, methacrylic acid-butadiene styrene elastomer graft copolymer 1Kg, stearic acid 0.25Kg, polyethylene wax After the 0.25Kg is prepared, add it to the high-speed mixer, stir until the temperature is 60°C, automatically discharge it into the cold mixer, cool it to 20°C, and then add the granulator whose temperature has been set, the barrel temperature of the granulator For: conveying section: 180°C; compression section: 190°C; melting section: 190°C; metering section: 190°C; head temperature: head body 190°C; Cooling and pelletizing, the temperature of cold cutting water is 20°C, after pelletizing, it becomes special material for modified PP-R plastics.

Embodiment 3, PP-R resin (RA130E) 75Kg, polyamide-polyphenylene ether blend 15Kg, polyamide 15Kg, ethylene-vinyl acetate copolymer 5Kg, maleic anhydride grafted polyolefin copolymer 5Kg, stearin 1Kg of monoglyceride, 1Kg of polyethylene wax, and 1Kg of stearic acid. After preparation, add to a high-speed blender, stir until the temperature is 100°C, automatically discharge into the cold blender, cool to 40°C, and then add The barrel temperature of the fixed granulator is: conveying section: 195°C; compression section: 195°C; melting section: 195°C; metering section: 198°C; head temperature: head body 210°C Die: 255°C, extruded and granulated, and then cooled and cut into pellets. The temperature of the cold cutting water is 45°C. After pelletizing, it becomes a special material for modified PP-R plastics.

Example 4, PP-R resin (RA130E) 70Kg, polyoxymethylene 8Kg, polycarbonate 8Kg, polyamide/styrene-maleic anhydride copolymer and polyphenylene ether blend 9Kg, high melting point polypropylene 7Kg, two Silicon oxide 1Kg, EPDM 3Kg, ethylene-vinyl acetate copolymer 3Kg, ethylene-acrylic acid ester copolymer 3Kg, polyethylene wax 1.0Kg After mixing, add to a high-speed mixer, stir until the temperature is 75°C, and then automatically discharge into the cold stirring In the machine, cool to 25°C, and then add the granulator whose temperature has been set. The barrel temperature of the granulator is: conveying section: 192°C; compression section: 194°C; melting section: 195°C; metering section: 195°C; head temperature: head body 205°C; die: 245°C, extruded and granulated, then cooled and cut into pellets, the cold cutting water temperature is 40°C, after pelletizing, it becomes a special material for modified PP-R plastics .

Embodiment 5, with PP-R resin (RA130E) 60Kg, polyamide/styrene-maleic anhydride copolymer 10Kg, polyamide 10Kg, high melting point polypropylene 15Kg, maleic anhydride graft olefin copolymer 5Kg, stearic acid After 2.0Kg is prepared, add it to a high-speed mixer and stir until the temperature is 90°C, then automatically discharge it into the cold mixer, cool it to 35°C, and then add it to the granulator whose temperature has been set. The temperature of the barrel of the granulator For: conveying section: 190°C; compression section: 192°C; melting section: 193°C; metering section: 195°C; head temperature: head body 200°C; Cooling and pelletizing, the temperature of cold cutting water is 40°C, after pelletizing, it becomes special material for modified PP-R plastics.

Embodiment 6, PP-R resin (RA130E) 55Kg, polyamide/styrene-maleic anhydride copolymer 4Kg, polyphenylene ether-polyamide blend 4KG, polyamide/styrene-maleic anhydride copolymer and After mixing 4Kg of polyphenylene ether, 3Kg of silicon dioxide, 3.0Kg of C803, and 1.5Kg of polyethylene wax, add it to a high-speed mixer, stir until the temperature reaches 70°C, then automatically discharge it into the cold blender, cool to 28°C, and then add The temperature of the granulator has been set. The barrel temperature of the granulator is: conveying section: 182°C; compression section: 191°C; melting section: 192°C; metering section: 192°C; head temperature: head Body 195°C; Die: 200°C, extruded and granulated, and then cooled and cut into pellets. The temperature of the cold cutting water is 35°C. After pelletizing, it becomes a special material for modified PP-R plastics.

Embodiment 7, after PP-R resin (RA130E) 65Kg, polyester 18Kg, high melting point polypropylene 20Kg, titanium dioxide 5Kg, HTNAO1 8Kg, stearic acid monoglyceride 2.5Kg are prepared, add high-speed mixer, stir until temperature is At 75°C, it will be automatically discharged into the cold mixer, cooled to 25°C, and then added to the granulator whose temperature has been set. The barrel temperature of the granulator is: conveying section: 188°C; compression section: 192°C; Melting section: 194°C; metering section: 196°C; machine head temperature: machine head body 198°C; die: 235°C, extruded and granulated, then cooled and pelletized, the temperature of the cold cutting water is 30°C, after pelletizing Become a special material for modified PP-R plastics.

The modified PP-R plastic special material of the present invention can be made into plastic pipes through extruders with general plastic processing equipment and techniques, and is widely used in cold and hot water systems, heating systems, central air-conditioning systems, transportation or Discharge chemical media, etc., and can also be made into various plastic containers according to conventional processes.

Claims (10)

1, special material for modifying PP-R plastics by weight, comprises PP-R resin 50-75 part, engineering plastics 10-30 part, expanding material 1-10 part, lubricant 0.5-3 part.

2, by the described special material for modifying PP-R plastics of claim 1, by weight, comprise PP-R resin 55-70 part, engineering plastics 12-25 part, expanding material 3-8 part, lubricant 0.5-2.5 part.

3, by the described special material for modifying PP-R plastics of claim 1, by weight, comprise 67 parts of PP-R resins, 15.5 parts in engineering plastics, 6.8 parts of expanding materials, 0.65 part of lubricant.

4, by claim 1 or 2 or 3 described special material for modifying PP-R plastics, it is characterized in that described engineering plastics are polyoxymethylene, polymeric amide, polycarbonate, polyamide-polyphenylene ether blend, polymeric amide/styrene-maleic anhydride copolymer and polyphenylene ether blend, polyphenylene ether-polyamide blend, polymeric amide/styrene-maleic anhydride copolymer, polyester, can be singly with also can be any two kinds and two or more mixing.

5, by claim 1 or 2 or 3 described special material for modifying PP-R plastics, it is characterized in that described expanding material is ethylene-acrylate copolymer, methacrylic ester-butadiene-styrene elastomer graft copolymer, ethylene-vinyl acetate copolymer, terpolymer EP rubber EPDM, maleic anhydride graft polyolefin copolymer, polymeric amide/rubber blend C803, polymeric amide/rubber blend HTNA01, can be singly with also can be any two kinds and two or more mixing.

6, by claim 1 or 2 or 3 described special material for modifying PP-R plastics, it is characterized in that described lubricant is polyethylene wax, stearic acid, stearic acid monoglycerides, can be singly with also can be any two kinds and two or more mixing.

7, by the described special material for modifying PP-R plastics of claim 1, it is characterized in that also can adding high-melting-point polypropylene 7-20 part.

8, by the described special material for modifying PP-R plastics of claim 1, it is characterized in that also can adding active nano material 1-5 part.

9, by the described special material for modifying PP-R plastics of claim 7, it is characterized in that also can adding active nano material 1-5 part.

10, by claim 8 or 9 described special material for modifying PP-R plastics, it is characterized in that described nano material is silicon-dioxide, titanium dioxide, lime carbonate.