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A preparation method of flame-retardant and toughened PBT for motor inserts

A technology of inserting and toughening, which is applied in the field of preparation of flame-retardant and toughened PBT, can solve the problems of PBT toughness influence, damage to PBT molecular connection performance, etc., and achieve the effect of improving adaptability, capacity and flame retardancy

Active Publication Date: 2022-03-15
常州市侨光电器塑料厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the direct addition of flame retardants to PBT will destroy the connection performance between PBT molecules, which will affect the toughness of PBT
[0004] For the above-mentioned related technologies, the inventor believes that there is a defect that affects the toughness of PBT after adding a flame retardant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] S1. After mixing silicon carbide powder and graphene powder at a weight ratio of 53:1, pour it into a mold, and perform dry pressing at 180MPa to obtain a silicon carbide green body.

[0036] S2. Put the above-mentioned silicon carbide green body into a vacuum pressureless sintering furnace, raise the temperature to 2100°C, then cool down to 1950°C for sintering and heat preservation for 9 hours, take it out and grind it after cooling to obtain silicon carbide-graphene powder.

[0037] S3. SiC-graphene powder, sintering aid B 4 C. Flame retardant zinc borate, defoamer n-octanol and dispersant cetylpyridinium bromide are mixed according to the weight ratio of 30:0.6:4:0.4:1.3 to form a mixture; the mixture is 0.4kg according to the mass volume ratio / L was added to deionized water, and ball milled for 18 hours to form a slurry.

[0038] S4. Send the slurry into a pressurized sintering furnace, adjust the sintering pressure to 40MPa, and sinter at 360°C for 2 hours at hi...

Embodiment 2

[0042] S1. After mixing silicon carbide powder and graphene powder at a weight ratio of 53:1, pour it into a mold, and perform dry pressing at 180MPa to obtain a silicon carbide green body.

[0043] S2. Put the above-mentioned silicon carbide green body into a vacuum pressureless sintering furnace, raise the temperature to 2100°C, then cool down to 1900°C for sintering and heat preservation for 8 hours, take it out and grind it after cooling to obtain silicon carbide-graphene powder.

[0044] S3. SiC-graphene powder, sintering aid B 4 C. Flame retardant zinc borate, defoamer n-octanol and dispersant cetylpyridinium bromide are mixed according to the weight ratio of 30:0.5:3:0.3:1.3 to form a mixture; the mixture is 0.3kg according to the mass volume ratio / L was added to deionized water, and ball milled for 15 hours to form a slurry.

[0045] S4. Send the slurry into a pressurized sintering furnace, adjust the sintering pressure to 40MPa, and sinter at a high temperature of 3...

Embodiment 3

[0049] S1. After mixing silicon carbide powder and graphene powder at a weight ratio of 53:1, pour it into a mold, and perform dry pressing at 180MPa to obtain a silicon carbide green body.

[0050] S2. Put the above-mentioned silicon carbide green body into a vacuum pressureless sintering furnace, raise the temperature to 2100°C, then cool down to 2000°C for sintering and heat preservation for 10 hours, take it out and grind it after cooling to obtain silicon carbide-graphene powder.

[0051] S3. SiC-graphene powder, sintering aid B 4 C. Flame retardant zinc borate, defoamer n-octanol and dispersant cetylpyridinium bromide are mixed according to the weight ratio of 30:0.7:5:0.5:1.3 to form a mixture; the mixture is 0.5kg according to the mass volume ratio / L was added to deionized water, and ball milled for 20 hours to form a slurry.

[0052] S4. Send the slurry into a pressurized sintering furnace, adjust the sintering pressure to 40MPa, and sinter at a high temperature of ...

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Abstract

The application relates to the field of motor inserts, and specifically discloses a method for preparing flame-retardant and toughened PBT used for motor inserts. The preparation method is: the modified silicon carbide powder, B 4 C. Flame retardant and defoamer are mixed to form a mixture; the mixture is mixed with water, and ball milled to form a slurry; the slurry is sintered at high temperature, cooled and ground after being released from the furnace to obtain a compound powder of silicon carbide-zinc borate; polyparaphenylene After preheating of butanediol diformate; mix the composite powder of polybutylene terephthalate, silicon carbide-zinc borate, antioxidant, lubricant, and hydrolysis inhibitor to obtain a mixed material; mix the mixed material The mixture is added into a twin-screw extruder, blended, extruded, cooled, and pelletized to obtain PBT composition particles. The preparation method of the present application has the advantage of reducing the impact of the flame retardant on the toughness of PBT, and the use of the above-mentioned PBT material in the motor insert can strengthen the flame retardancy of the insert without affecting the toughness of the insert.

Description

technical field [0001] This application relates to the field of PBT preparation, more specifically, it relates to a preparation method of flame-retardant and toughened PBT used for motor inserts. Background technique [0002] The motor insert is used to electrically conduct the motor with the motor control system. The motor insert usually includes a body and a connecting part. The connecting part is arranged on one side of the long side of the body and is bent downward in a direction perpendicular to the long side of the body. PBT refers to polybutylene terephthalate, which is a polyester made by polycondensation of terephthalic acid and 1,4-butanediol. [0003] The prior art can refer to the Chinese invention patent with the publication number CN105968742A, which discloses a halogen-free flame retardant PBT, including a nitrogen-based flame retardant, a phosphorus-based flame retardant, a nucleating agent, a lubricant, a char-forming agent, an anti- Oxygen, glass fiber, PB...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08K13/06C08K9/02C08K9/00C08K3/34C08K3/38
CPCC08K13/06C08K9/02C08K9/00C08K3/34C08K3/38C08L2201/02C08K2003/387C08L67/02
Inventor 顾科
Owner 常州市侨光电器塑料厂有限公司
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