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High-strength modified plastic processing method

A processing method and high-strength technology, applied in the field of plastics, can solve the problems of physical and mechanical performance degradation, poor light and thermal stability, and affect operation, etc., to achieve the effects of improving flow properties, easy extrusion molding, and reducing processing difficulty

Pending Publication Date: 2021-09-21
JIESHOU JINFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The polyvinyl chloride plastic sold on the market has a small degree of branching, a relative density of about 1.4, a glass transition temperature of 77-90°C, and begins to decompose at around 170°C. It has poor stability to light and heat. When exposed to sunlight, it will decompose to produce hydrogen chloride, and further autocatalyze the decomposition, causing discoloration, rapid decline in physical and mechanical properties, greater brittleness and poor impact resistance, etc., which cannot meet the special requirements of some special industries for material strength and toughness.
[0003] The mechanical properties of polyvinyl chloride plastics are usually modified by adding high-strength fibers, such as carbon fibers, glass fibers, nylon, etc. Increasing the fiber content can improve the mechanical properties of the plastics, but due to the high fiber content during extrusion molding, the mechanical properties Well, the flow properties of plastics are poor, the processing conditions are harsh, and the machine wears seriously, which leads to deformation of parts and affects its operation

Method used

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  • High-strength modified plastic processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of modified coupling agent:

[0043]Step S1, under the protection of nitrogen, add 60.5mmol phenanthrenequinone, 60.5mmol 4-chloroaniline, 241mmol ammonium acetate, 60.5mmol 4-chlorobenzaldehyde, 3.1mL glacial acetic acid and 250mL acetonitrile into a three-necked flask, stir well, and heat Refluxing reaction at 75°C for 20h, cooling to room temperature, pouring the product into methanol, stirring and suction filtration, washing the filter cake with methanol for 3 times, and drying at 60°C for 10h to obtain intermediate 1;

[0044] Step S2, under the protection of nitrogen, add 53.2mmol of intermediate 1, 106.4mmol of 1,4-diol trifluorotoluene, 106.4mmol of potassium carbonate and 151mL of DMAC into a three-necked flask, stir evenly, heat to 145°C for 11h, and cool After reaching room temperature, the product was poured into deionized water, stirred, suction filtered, the filter cake was washed twice with methanol, recrystallized with ethyl acetate, and drie...

Embodiment 2

[0049] Preparation of modified coupling agent:

[0050] Step S1, under the protection of nitrogen, add 60.8mmol phenanthrenequinone, 60.8mmol 4-chloroaniline, 241.2mmol ammonium acetate, 60.7mmol 4-chlorobenzaldehyde, 3.3mL glacial acetic acid and 253mL acetonitrile into a three-necked flask, stir well, and heat to Reflux at 78°C for 21 hours, cool to room temperature, pour the product into methanol, stir and filter with suction, wash the filter cake with methanol for 3 times, and dry at 60°C for 11 hours to obtain intermediate 1;

[0051] Step S2, under the protection of nitrogen, add 53.8mmol of intermediate 1, 107.2mmol of 1,4-diol trifluorotoluene, 107.5mmol of potassium carbonate and 153mL of DMAC into a three-necked flask, stir evenly, and heat to 145°C for 11h. Cool to room temperature, pour the product into deionized water, stir, filter with suction, wash the filter cake twice with methanol, recrystallize with ethyl acetate, and dry at 60°C for 11 hours to obtain inter...

Embodiment 3

[0056] Preparation of modified coupling agent:

[0057] Step S1, under the protection of nitrogen, add 61mmol phenanthrenequinone, 61mmol 4-chloroaniline, 241.5mmol ammonium acetate, 61mmol 4-chlorobenzaldehyde, 3.5mL glacial acetic acid and 255mL acetonitrile into a three-necked flask, stir well, and heat to 82 Reflux at ℃ for 22 hours, cool to room temperature, pour the product into methanol, stir and filter with suction, wash the filter cake with methanol for 4 times, and dry at 60℃ for 12 hours to obtain intermediate 1;

[0058] Step S2, under the protection of nitrogen, add 54mmol of intermediate 1, 108mmol of 1,4-diol trifluorotoluene, 108mmol of potassium carbonate and 155mL of DMAC into a three-necked flask, stir evenly, heat to 145°C for 12h, cool to room temperature, The product was poured into deionized water, stirred, suction filtered, the filter cake was washed 3 times with methanol, recrystallized with ethyl acetate, and dried at 60°C for 12 hours to obtain inter...

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Abstract

The invention discloses a high-strength modified plastic processing method, and belongs to the technical field of plastics. The processing method comprises the following steps: 1, weighing corresponding parts by weight of raw materials; 2, carrying out an impregnation process on glass fibers and a modified coupling agent to obtain modified glass fibers; 3, mixing the modified glass fibers and the remaining raw materials, conveying the obtained mixture to a double-screw extruder, and carrying out melting, compounding, granulation and drying to obtain the high-strength modified plastic. The method is based on the improvement of a conventional plastic processing method, an impregnation technology is added in the steps, the purpose is to conduct surface modification on reinforcing filler glass fibers, so the flowing property of the glass fibers is improved, the processing difficulty is reduced, extrusion molding is easy, a silane coupling agent is modified, and the surface modification effect is achieved; a certain gain effect is achieved on the mechanical strength of the base material; in addition, molybdenum disulfide and diatomite are added to improve wear resistance of the plastic.

Description

technical field [0001] The invention belongs to the technical field of plastics and relates to a processing method for high-strength modified plastics. Background technique [0002] The polyvinyl chloride plastic sold on the market has a small degree of branching, a relative density of about 1.4, a glass transition temperature of 77-90°C, and begins to decompose at around 170°C. It has poor stability to light and heat. When exposed to sunlight, it will decompose to produce hydrogen chloride, and further autocatalyze the decomposition, causing discoloration, rapid decline in physical and mechanical properties, greater brittleness and poor impact resistance, etc., which cannot meet the special requirements of some special industries for material strength and toughness. . [0003] The mechanical properties of polyvinyl chloride plastics are usually modified by adding high-strength fibers, such as carbon fibers, glass fibers, nylon, etc. Increasing the fiber content can improve...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L33/04C08K7/14C08K3/30C08K7/26C08K9/06C08K9/04C08K3/36C08K13/06
CPCC08L27/06C08K2003/3009C08L33/04C08K7/14C08K3/30C08K7/26C08K9/06C08K9/08C08K3/36C08K13/06
Inventor 陈俊青陈军张丽萍
Owner JIESHOU JINFENG PLASTIC
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