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Preparation method of reinforced polybutylene terephthalate material

A polybutylene terephthalate and raw material technology, which is applied in the field of preparation of reinforced polybutylene terephthalate materials, can solve problems such as difficult dispersion, poor compatibility, and unusable plant fibers, and achieve powerful effect

Pending Publication Date: 2021-07-20
广西安全工程职业技术学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies, the present invention discloses a method for preparing a reinforced polybutylene terephthalate material, which solves the Butanediol ester resin has poor compatibility and is difficult to disperse, which leads to the problem that plant fibers cannot be used for thermoplastic material processing

Method used

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  • Preparation method of reinforced polybutylene terephthalate material
  • Preparation method of reinforced polybutylene terephthalate material
  • Preparation method of reinforced polybutylene terephthalate material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A preparation method for strengthening polybutylene terephthalate material, it may further comprise the steps:

[0029] (1) Weigh raw materials according to the following weight percentages: 75% polybutylene terephthalate, 20% cellulose microcrystalline, 0.1% organotin, 4% toughening agent, 0.2% primary antioxidant, 0.3% Secondary antioxidant, 0.4% lubricant;

[0030]The viscosity of the polybutylene terephthalate is 0.8-1.1dl / g, and the content of terminal carboxyl groups is less than or equal to 12mol / t;

[0031] The cellulose microcrystals exist in the form of cellulose I, with a crystallinity index of 70%, a diameter of 10-15 μm, and a length of 500-600 μm;

[0032] The main antioxidant is tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester;

[0033] The secondary antioxidant is bis(2,4-diacyl)pentaerythritol diphosphite;

[0034] Described lubricant is silicone powder;

[0035] The toughening agent is ethylene-methyl acrylate-glycidyl...

Embodiment 2

[0038] A preparation method for strengthening polybutylene terephthalate material, it may further comprise the steps:

[0039] (1) First cut the plant fiber into pieces, the length of which is 4-6 cm, then add the plant fiber, sodium hydroxide, sodium sulfide and water into the autoclave at a weight ratio of 5:2:2:50, After mixing evenly, react at a temperature of 170°C for 3 hours, then wash the obtained product three times with distilled water, add a solution of sodium chlorite, acetic acid, and water, and mix the product with the added sodium chlorite, acetic acid, and The weight ratio of water is 20:6.7:5:650, and then the solution is reacted at 80 °C for 3 h to obtain cellulose microcrystals, and then the cellulose microcrystals are washed three times with distilled water and then heated at 75 °C The plant fiber is sisal fiber; the cellulose microcrystal exists in the form of cellulose I, its crystallinity index is 75.35%, the diameter is 10-15 μm, and the length is 200-3...

Embodiment 3

[0048] A preparation method for strengthening polybutylene terephthalate material, it may further comprise the steps:

[0049] (1) First cut the plant fiber into pieces, the length of which is 4-6 cm, then add the plant fiber, sodium hydroxide, sodium sulfide and water into the autoclave at a weight ratio of 5:2:2:50, After mixing evenly, react at a temperature of 170°C for 3 hours, then wash the obtained product three times with distilled water, add a solution of sodium chlorite, acetic acid, and water, and mix the product with the added sodium chlorite, acetic acid, and The weight ratio of water is 20:6.7:5:650, and then the solution is reacted at 80 °C for 3 h to obtain cellulose microcrystals, and then the cellulose microcrystals are washed three times with distilled water and then heated at 75 °C The plant fiber is a combination of bamboo fiber and bagasse fiber; the cellulose microcrystal exists in the form of cellulose I, its crystallinity index is 77.26%, its diameter ...

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Abstract

The invention discloses a preparation method of a reinforced polybutylene terephthalate material. The preparation method comprises the following steps: firstly, weighing the following raw materials in percentage by weight: 62-80% of polybutylene terephthalate, 15-20% of cellulose microcrystals, 0.1-0.3% of organic tin, 4% of a toughening agent, 0.2% of a main antioxidant, 0.3% of an auxiliary antioxidant, 0.4% of a lubricant, 0-14% of a flame retardant and 0-4% of a flame retardant accelerant; and uniformly mixing the raw materials, adding the mixture into a double-screw extruder, carrying out melt extrusion in the presence of a catalyst at high temperature, and conducting water cooling, air knife cooling and drying, granulation and homogenization to obtain the reinforced polybutylene terephthalate material. According to the method disclosed by the invention, terminal carboxyl groups of a PBT molecular chain react with hydroxyl groups on the surfaces of cellulose microcrystals through an in-situ reaction, hydrogen bonds of the cellulose microcrystals are destroyed, the polarity is reduced, the interfacial compatibility of the cellulose microcrystals and PBT resin is enhanced, and the problems of poor compatibility and difficult dispersibility of plant fibers and the PBT resin are solved under the conditions of no esterification and no graft modification.

Description

technical field [0001] The invention belongs to the technical field of polymer functional composite materials, and in particular relates to a preparation method of a reinforced polybutylene terephthalate material. Background technique [0002] With the depletion of non-renewable resources, the aggravation of environmental problems and the government's attention to sustainable development, natural renewable, environmentally friendly and degradable materials are more and more popular. Natural plant fiber has the characteristics of wide sources, renewable, degradable, green and environmental protection, good biocompatibility, and no damage to machines and people during molding and processing. At present, the main products are hemp rope, cloth, handmade products, etc., and its products are low-end. , low added value, narrow application range, and less research and application of plant fiber reinforced polymer materials. [0003] Li Rui from Northeast Forestry University used ju...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L1/04C08B15/02
CPCC08L67/02C08B15/02C08L1/04
Inventor 曾德明唐绍其李仲良王燕华黄颖
Owner 广西安全工程职业技术学院