Fiber-reinforced polycarbonate composition and preparation method thereof

A polycarbonate, fiber reinforced technology, applied in the field of engineering plastics, can solve the problems of not being able to achieve the balance of rigidity and toughness, reducing material toughness, affecting dimensional stability and processing fluidity, etc., achieving reduced damage, excellent low temperature toughness, and increased application The effect of functionality and practicality

Inactive Publication Date: 2016-03-23
SHANGHAI KINGFA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, fibrous fillers are mainly used for reinforcement in the system. The addition of fibrous fillers will greatly reduce the toughness of the material, and the balance of rigidity and toughness cannot be achieved. The conventional method is to increase the toughe

Method used

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  • Fiber-reinforced polycarbonate composition and preparation method thereof
  • Fiber-reinforced polycarbonate composition and preparation method thereof
  • Fiber-reinforced polycarbonate composition and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-9 and

[0053] Embodiment 1-9 and comparative example 1-7 follow the steps below, to prepare polycarbonate composition:

[0054] Step 1: Prepare raw materials according to the following components: polycarbonate, polysiloxane-polycarbonate copolymer, glass fiber, release agent and additives;

[0055] Step 2: Dry the raw materials in step 1, the drying temperature is 120-130°C, and the drying time is 4-6h;

[0056] Step 3: Add the dried polycarbonate, polysiloxane-polycarbonate copolymer, mold release agent and auxiliary agent into a high-speed mixer for mixing at a temperature of 30-50°C and a mixing time of 5-15min, obtain the mixed material, stand-by;

[0057] Step 4: Add the mixed material in step 3 to the first feeding port 1, add the glass fiber to the first feeding port 1, the second feeding port 2 or the third feeding port 3, and in the first screw barrel 4 , Stay in the second screw barrel 5 or the third screw barrel 6 for a certain period of time, the number of parts added ...

Embodiment 1-9

[0082] The proportioning of the used raw material of embodiment 1-9 sees the following table:

[0083]

[0084]

[0085] Wherein embodiment 1,4 and 7: based on the glass fiber gross weight, the glass fiber that accounts for glass fiber gross weight 50% adds from the first feeding port 1, and the residence time in the first screw barrel 4 is 20- 30s; Based on the glass fiber gross weight, the glass fibers that account for 50% of the glass fiber gross weight are from the second feeding port 2, and the residence time in the second screw barrel 5 is 8-15s; obtain embodiment 1, embodiment 4. The composition of Component I and Component II of Example 7 comprising specific glass fiber length distribution and weight ratio;

Embodiment 2

[0086] Embodiment 2, 5 and 8: Based on the total weight of glass fibers, the glass fibers accounting for 80% of the total weight of glass fibers are added from the first feeding port 1, and the residence time in the first screw barrel 4 is 20-30s Based on the glass fiber gross weight, the glass fiber that accounts for 20% of the glass fiber gross weight is from the second feeding port 2, and the residence time in the second screw barrel 5 is 8-15s; obtain embodiment 2, embodiment 5 Compositions of Component I and Component II comprising specific glass fiber length distributions and weight ratios of Example 8;

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Abstract

The invention discloses a fiber-reinforced polycarbonate composition which includes the following components, by weight: 50-90 parts of polycarbonate, 5-50 parts of a polysiloxane-polycarbonate copolymer, 5-50 parts of a fiber-like filling material, 0.01-1 part of a composite demoulding agent and 0-10 parts of an additive. The polysiloxane-polycarbonate copolymer is prepared by polymerizing polydimethylsiloxane and polycarbonate. The polydimethylsiloxane accounts for 0.05-30% by weight of the polycarbonate composition. The invention also provides a preparation method of the fiber-reinforced polycarbonate composition. In the invention, by means of regulation of distributions of length and content of the fiber-like filling material in the polycarbonate composition, double-peak distribution of the fiber-like filling material in the polycarbonate composition is achieved. With combination of the composite demoulding agent, the polycarbonate composition is improved in rigidity and also has flame-retarding property and excellent toughness. Meanwhile, the polycarbonate composition is reduced in demoulding force and damage on a mould, and is improved in applicability and practicability.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, in particular to a fiber-reinforced polycarbonate composition and a preparation method thereof. Background technique [0002] Polycarbonate PC is one of the five major engineering plastics. It has high impact resistance and heat resistance, and is widely used in all aspects of people's production and life. However, due to some defects of polycarbonate, such as poor processing performance, easy stress cracking, sensitive notch resistance, and poor wear resistance, it cannot meet the needs of actual use in some occasions, so people began to use glass fiber for polycarbonate. Esters are enhanced. [0003] Glass-reinforced PC materials are widely used in the fields of automobiles, electronic appliances, and home appliance materials due to their good strength, toughness, and thermal properties. However, in conventional glass fiber-reinforced PC materials, glass fiber can give the materi...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L83/10C08K13/04C08K7/14C08K5/526B29C47/92B29C48/92
CPCC08L69/00B29C48/92B29C2948/92704C08K2201/003C08L83/10C08K13/04C08K7/14C08K5/526
Inventor 岑茵
Owner SHANGHAI KINGFA SCI & TECH
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