CN106700198A - Glass fiber wet mat modified thermoplastic plastic and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of plastic modification, in particular to a glass fiber wet-process thin felt modified thermoplastic and a preparation method thereof. The invention uses glass fiber wet-process thin felt as a reinforcing material, and the preparation of the composite material adopts a banburying process, and the glass fiber is evenly distributed in the material in a three-dimensional manner, and an isotropic industrial product is produced, which is different from that in the prior art Compared with glass fiber wet-laid thin mat modified thermoplastics, the molding method and fiber distribution method are completely different. The industrial products of the present invention have high tensile strength, bending strength and impact strength, excellent mechanical properties, short manufacturing cycle, and can be repeatedly processed and regenerated; at the same time, the present invention adopts various preparation techniques to produce green, environmental protection, low energy consumption and high mechanical properties Excellent glass fiber wet-process thin mat modified thermoplastics, which can be processed into various industrial products by injection molding or molding according to actual needs.

Description

Glass fiber wet mat modified thermoplastic and preparation method thereof

technical field

The invention belongs to the technical field of plastic modification, and in particular relates to a glass fiber wet-process thin felt modified thermoplastic and a preparation method thereof.

Background technique

Glass fiber wet-laid thin mat is a mat-shaped non-woven glass fiber product made of glass fibers with a fixed length of 3-24mm bonded by a wet process with an emulsion binder. It is made of glass mat and urea-formaldehyde resin by a wet process. Felt. Glass fiber wet-laid thin mat has the advantages of smooth surface and low weight, and is widely used in many fields such as reinforced asphalt building materials, FRP composite materials, battery separators and printed circuit boards.

Patent CN1123014A discloses a method for manufacturing glass fiber felt reinforced thermoplastic panels. In this method, a glass fiber mat is melt-impregnated with a thermoplastic resin, and the composite of glass fiber mats is subsequently pressed, wherein at least one glass fiber mat moves through the nozzle slot of an impregnation nozzle to adjustably supply the glass fiber mat Thermoplastic melt, coated above and below the fiberglass mat at the outlet of the nozzle slot, pre-impregnating the glass fiber mat, after which the pre-impregnated glass fiber mat is transferred to the entrance roll gap of the twin-belt press and pre-aligned, followed by pressing under pressure with the aid of a cooling plate into a glass-fibre-mat-reinforced thermoplastic sheet. This patent improves the uniformity of glass mat impregnated with thermoplastic resin, making the preparation of thermoplastic sheets easier to implement and reducing energy consumption. However, the glass fibers in the glass fiber mat exist in the product sheet in a two-dimensional form.

Patent CN1204280A discloses a composite sheet made of a moldable resin and reinforcing fibers, wherein the resin is a thermoplastic resin, a thermosetting resin or a mixture thereof, and the reinforcing fibers are fibers centrifuged by a rotary fiberizer. Composite panels have at least five distinct reinforcing fiber layers per mm thick. The composite panel is formed by compression molding and has at least ten and preferably thirty distinct layers of reinforcing fibers. At least 85% of the reinforcing fibers are monofilaments, and the reinforcing fibers are glass wool fibers. The reinforcing material glass fiber in this patent is distributed in the composite material in a two-dimensional form, and the content of the fiber is 20-50%.

Patent CN105315620A discloses an epoxy resin reinforced laminated insulating profile and its preparation process. The preparation steps include: A. mixing epoxy resin, curing agent, accelerator, wetting and dispersing agent and solvent according to the ratio to prepare a solution, Then add a flame retardant to obtain a modified polymer solution; B, immerse reinforcing materials such as glass fiber felt in the modified polymer solution obtained in step A to make a prepreg; C, cut the prepreg obtained in step B 1. Laying layers, loading materials in a special mold, using a press to form profiles of various shapes through hot pressing; D, cooling the profiles obtained in step C, unloading and inspecting, and finally processing them into finished products. The method solves the problem that the traditional epoxy resin laminated insulating profiles in the current technology have poor mechanical properties, low tensile strength and bending strength, and do not have arc resistance and tracking resistance. However, the preparation of prepreg needs to impregnate the fiber mat in a large amount of polymer solution, which requires a large amount of organic solvents, which does not meet the requirements of environmental protection, and the epoxy resin is a thermosetting resin, and its matrix has insufficient toughness and resistance to heat and humidity. Defects such as poor quality, non-repeatable processing, and non-recyclable reuse.

At present, there is an urgent need to develop a modified thermoplastic with excellent mechanical properties and reinforced by glass fiber wet-laid mat.

Contents of the invention

The purpose of the present invention is to provide a glass fiber wet-process thin mat modified thermoplastic with excellent mechanical properties, high tensile strength, bending strength and impact strength, short manufacturing cycle, and capable of repeated processing and regeneration; the present invention also provides its preparation method.

The glass fiber wet-process thin mat modified thermoplastics of the present invention uses the glass fiber wet-process thin mat as a reinforcement body, takes thermoplastics as a matrix, and uses banburying technology for mixing to obtain molten materials, which are obtained after molding. Glass fiber wet-laid thin mat modified thermoplastic.

in:

Based on the total weight of the glass fiber wet mat modified thermoplastics, the content of the glass fiber wet mat is 10-80 wt%.

The thermoplastic is polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, polyetheretherketone or polyetherketoneketone.

The temperature of the banburying process is 100-450° C., the time is 5-40 minutes, and the rotor speed is 10-100 r/min. The mixing process parameters vary with the type of matrix resin.

When the mixing process is carried out by banburying, a maleic anhydride grafted polyolefin compatibilizer is added, and the amount of the compatibilizer is 0-10wt% based on the total weight of the glass fiber wet-process thin mat modified thermoplastic.

When using banburying process for mixing, add coupling agent, based on the total weight of glass fiber wet-process thin felt modified thermoplastic, the amount of coupling agent is 0-1wt%, and the coupling agent is γ-aminopropyl triethyl One of oxysilane, γ-(2,3-glycidoxy)propyltrimethoxysilane or γ-mercaptopropyltrimethoxysilane.

The resulting molten material can be prepared in one of the following ways:

(1) Put the obtained molten material into a press mold for compression molding.

(2) Put the obtained molten material into an extruder, extrude a plate-shaped molten billet, put it into a mold of the press, and mold it or form it through multi-roller calendering.

(3) Put the obtained molten material into the silo of the injection device for injection molding.

(4) Put the obtained molten material into the feed bin of the injection machine for injection molding.

(5) Put the obtained molten material into an injection molding machine for injection molding.

Taking polyethylene as an example, adopt method (3) injection molding process to process a cover plate with a thickness of 10mm, wherein the molding temperature is 100-240°C, the preheating time is 5-15min, the holding time is 10-40min, and the pressure is 10-240℃. 25MPa.

Taking polyethylene as an example, the plate is obtained by injection molding in method (4), wherein, the injection temperature is 120-240°C, the injection pressure is 6-8MPa, the holding time is 20-60s, and the cooling time is 1-2min. The improvement of the pressure, the holding time and cooling time will increase accordingly.

The preparation method of the glass fiber wet mat modified thermoplastic is to mix the glass fiber wet mat and thermoplastics by using a banburying process to obtain a molten material, and after molding, the glass fiber wet mat is obtained. Modified thermoplastic in which the glass fibers are uniformly distributed in three dimensions throughout the material.

The beneficial effects of the present invention are as follows:

The present invention uses glass fiber wet-process thin felt as a reinforcing material, adopts banburying technology, and evenly distributes glass fibers in the material in a three-dimensional manner to produce isotropic industrial products. Compared with thin mat modified thermoplastics, the molding method and fiber distribution method are completely different.

The industrial products of the present invention have high tensile strength, bending strength and impact strength, excellent mechanical properties, short manufacturing cycle, and can be repeatedly processed and regenerated; at the same time, the present invention adopts various preparation techniques to produce green, environmental protection, low energy consumption and high mechanical properties Excellent glass fiber wet-process thin felt modified thermoplastics, which can be processed into various industrial products by injection molding, molding, calendering, pressure injection or injection according to actual needs.

detailed description

The present invention is further described below in conjunction with embodiment.

Example 1

30wt% glass fiber wet-laid thin felt, 1wt% silane coupling agent KH560, 4wt% maleic anhydride grafted polyethylene, 65wt% high-density polyethylene, mixed with a plastic internal mixer at 220°C for 10min, the rotor speed 60r/min, take out the mixed composite material and put it into the injection molding machine, and inject it into a standard sample for testing for testing.

Mechanical performance test results:

Tensile strength, 41.47MPa;

Bending strength, 47.84MPa;

Impact strength, 11.11kJ/m ² .

Example 2

50wt% glass fiber wet-laid thin mat, 0.5wt% silane coupling agent KH560, 8wt% maleic anhydride grafted polyethylene, 41.5wt% high-density polyethylene, using a plastic mixer at 220 ° C for 10 minutes, The rotor speed is 60r/min. The mixed composite material is taken out and put into the injection molding machine, and injected into a standard sample for testing for testing.

Mechanical performance test results:

Tensile strength: 28.72MPa;

Bending strength: 35.872MPa;

Impact strength: 6.5185kJ/m ² .

Example 3

50wt% glass fiber wet-laid thin mat, 0.5wt% silane coupling agent KH560, 49.5wt% high-density polyethylene, mixed for 10min at a temperature of 200°C with a plastic internal mixer, and the rotor speed was 60r/min. After the good composite material is taken out, it is put into the injection molding machine, and injected into a standard sample for testing for testing.

Mechanical performance test results:

Tensile strength: 59.86MPa;

Bending strength: 76.55MPa;

Impact strength: 10.07kJ/m ² .

Example 4

50wt% glass fiber wet-laid thin felt, 50wt% high-density polyethylene, mixed with a plastic internal mixer at a temperature of 240°C for 10min, and the rotor speed was 60r/min, took out the mixed composite material and put it into the injection molding machine , injection molded into a standard sample for testing.

Mechanical performance test results:

Tensile strength: 47.45MPa;

Bending strength: 55.76MPa;

Impact strength: 14.60kJ/m ² .

Example 5

70wt% glass fiber wet-laid thin felt, 30wt% high-density polyethylene, mixed with a plastic internal mixer at a temperature of 220°C for 10min, and the rotor speed was 60r/min, took out the mixed composite material and put it into the injection molding machine , injection molded into a standard sample for testing.

Mechanical performance test results:

Tensile strength: 55.62MPa;

Bending strength: 70.42MPa;

Impact strength: 9.19kJ/m ² .

Example 6

30wt% glass fiber wet-laid thin felt, 8wt% maleic anhydride grafted polyethylene, 62wt% high-density polyethylene were mixed for 10 minutes at a temperature of 220°C with a plastic internal mixer, and the rotor speed was 60r/min. After the good composite material is taken out, put it into the feeding barrel of the extruder, extrude the plate-shaped molten billet at 220°C and 40r/min, and form it into a 3mm plate by direct multi-roller calendering.

Mechanical performance test results:

Tensile strength: 120MPa;

Bending strength: 135MPa.

Example 7

After the composite material mixed in Example 6 was taken out, it was crushed into granules of about 10 mm, and then put into a mold of a press, and molded into a 3 mm plate at 220° C. and 6 MPa.

Mechanical performance test results:

Tensile strength: 128.8MPa;

Bending strength: 161.2MPa.

Claims (10)

1. a kind of glass fiber wet mat modified thermoplastic, it is characterised in that：It is enhancing with glass fiber wet mat Body, with thermoplastic as matrix, is kneaded using banburying process, obtains molten material, and glass fibre is obtained after shaping Wet method mat modified thermoplastic.

2. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：With glass fibre On the basis of wet method mat modified thermoplastic gross weight, the content of glass fiber wet mat is 10~80wt%.

3. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：Thermoplastic It is polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, makrolon, polyether-ether-ketone or PEKK.

4. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：Banburying process Temperature is 100~450 DEG C, and the time is 5~40min, and rotor speed is 10~100r/min.

5. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：Using banburying work When skill is mixed, maleic anhydride stem grafting polyolefin compatilizer is added, it is total with glass fiber wet mat modified thermoplastic On the basis of weight, compatilizer consumption is 0~10wt%.

6. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：Using banburying work When skill is mixed, coupling agent is added, on the basis of glass fiber wet mat modified thermoplastic gross weight, coupling agent is used It is 0~1wt% to measure, and coupling agent is gamma-aminopropyl-triethoxy-silane, γ-(2,3- glycidoxy) propyl trimethoxy silicon One kind in alkane or γ-mercaptopropyl trimethoxysilane.

7. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：It is molten by what is obtained Melt shape material and insert compression molding in press die.

8. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：It is molten by what is obtained Melt shape material to insert in extruder, the blank of extrusion tabular melting, be put into the mould of press compression molding or roll through multiple roll Shaping.

9. glass fiber wet mat modified thermoplastic according to claim 1, it is characterised in that：It is molten by what is obtained Melt in the feed bin that shape material inserts injecting unit, carry out injection-compression molding, or the molten material that will be obtained inserts injector In feed bin, injection moulding is carried out, or the molten material that will be obtained is inserted in injection machine, carries out injection moulding.

10. the preparation method of any described glass fiber wet mat modified thermoplastic of a kind of claim 1~9, its It is characterised by：Glass fiber wet mat, thermoplastic are kneaded using banburying process, is obtained molten material, into Glass fiber wet mat modified thermoplastic is obtained after type.