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A kind of preparation method of modified polybutylene terephthalate granular material

A technology of polybutylene terephthalate and pellets is applied in the field of preparation of modified polybutylene terephthalate pellets, which can solve the problem of low notched impact strength, poor product toughness, and sensitivity to notched impact. and other problems, to achieve the effect of reducing the relative density and melting point, increasing the elongation at break, and increasing the notched impact strength

Active Publication Date: 2015-09-23
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of the existing polybutylene terephthalate (PBT) notched impact sensitivity, poor product toughness, and low notched impact strength, the invention provides a modified polybutylene terephthalate pellet preparation method

Method used

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  • A kind of preparation method of modified polybutylene terephthalate granular material
  • A kind of preparation method of modified polybutylene terephthalate granular material
  • A kind of preparation method of modified polybutylene terephthalate granular material

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Experimental program
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Effect test

Embodiment 1

[0014] The relative density is 1.32, the melting point is 225°C, and the notched impact strength is 3.45KJ / m 2 , PBT resin with an elongation at break of 14.25%, a tensile strength of 58.56 MPa, and a bending strength of 78.83 MPa was placed in an electric heating constant temperature blast dryer, and the temperature of the electric heating constant temperature blast dryer was controlled at 117 ° C for 4 hours; SEBS-g-MAH with a mass percentage of 1.8% grafting rate of anhydride and a melt mass flow rate of 3.5g / 10min was placed in another electrothermal constant temperature blast dryer, and the temperature of the electrothermal constant temperature blast dryer was controlled at 102°C , dried for 2 hours; weighed 82 kg of dried PBT resin and 17 kg of dried SEBS-g-MAH and placed them in a high-speed mixer, added 0.7 kg of tris(2,4-di-tert-butylphenyl) phosphite, Control the speed of the high-speed mixer at 500r / min, the temperature at 93°C, stir and mix for 5 minutes to form a ...

Embodiment 2

[0019] The relative density is 1.32, the melting point is 225°C, and the notched impact strength is 3.45KJ / m 2 , PBT resin with an elongation at break of 14.25%, a tensile strength of 58.56 MPa, and a bending strength of 78.83 MPa was placed in an electric heating constant temperature blast dryer, and the temperature of the electric heating constant temperature blast dryer was controlled at 116°C, and dried for 4 hours; SEBS-g-MAH with 1.8% mass percentage of toric anhydride grafting rate and 3.5g / 10min melt mass flow rate is placed in another electric heating constant temperature blast dryer, and the temperature of the electric heating constant temperature blast dryer is controlled at 101°C , dried for 2 hours; weighed 79 kg of dried PBT resin and 20 kg of dried SEBS-g-MAH and put them in a high-speed mixer, added 1 kg of tris(2,4-di-tert-butylphenyl) phosphite, Control the speed of the high-speed mixer at 500r / min, the temperature at 92°C, and stir and mix for 5 minutes to f...

Embodiment 3

[0024] The relative density is 1.32, the melting point is 225°C, and the notched impact strength is 3.45KJ / m 2, PBT resin with an elongation at break of 14.25%, a tensile strength of 58.56 MPa, and a bending strength of 78.83 MPa was placed in an electric heating constant temperature blast dryer, and the temperature of the electric heating constant temperature blast dryer was controlled at 118°C, and dried for 4 hours; The SEBS-g-MAH with a grafting rate of toic anhydride of 1.8% and a melt mass flow rate of 3.5g / 10min is placed in another electric constant temperature blast dryer, and the temperature of the electric constant temperature blast dryer is controlled at 103°C , dry for 2 hours; weigh 85 kg of dried PBT resin and 14 kg of dried SEBS-g-MAH and put them in a high-speed mixer, add 0.5 kg of tris(2,4-di-tert-butylphenyl) phosphite, Control the speed of the high-speed mixer at 500r / min, the temperature at 94°C, and stir and mix for 5 minutes to form a mixture; place the...

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Abstract

The invention relates to a method for preparing modified polybutylene terephthalate granules. The method comprises the steps of adding 14-20 parts by weight of maleic anhydride grafted styrene-ethylene-butadiene-styrene block copolymer and 0.5-1 part by weight of tris(2,4-di-tert-butylphenyl)phosphite to 79-85 parts by weight of polybutylene terephthalate which serves as a basic raw material, and carrying out the processes of drying for dehumidifying, material mixing, melt extrusion, traction cooling, dicing and packaging, thereby obtaining the modified polybutylene terephthalate granules. Compared with pure polybutylene terephthalate resin, the granules prepared by adopting the method have the advantages that the elongation at break is increased by over 200%, the notched impact strength is improved by over 130%, the tensile strength and bending strength are lowered to some extent, the relative density and melting point are lowered slightly, and the physical and mechanical properties are excellent, thus the granules are applicable to the injection molding of products, such as impact-resistant electronic appliance shells, impact-resistant engineering plastic fittings and the like.

Description

technical field [0001] The invention relates to a preparation method of modified plastic granules, in particular to a preparation method of modified polybutylene terephthalate granules. Background technique [0002] Polybutylene terephthalate (PBT) is a crystalline thermoplastic engineering plastic with high heat resistance, good fatigue resistance, stable size, high mechanical strength, good electrical insulation performance, and low creep at high temperature, etc. Advantages, it has become the fifth largest general-purpose engineering plastic after polyamide (PA), polycarbonate (PC), polyoxymethylene (POM) and modified polyphenylene oxide (MPPO), and is widely used in automobiles, machinery, household appliances, etc. field is applied. However, pure PBT has defects such as sensitivity to notched impact, poor toughness, and low notched impact strength, which limit its application fields. [0003] In recent years, researchers at home and abroad have used toughening modific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L51/00C08K5/526B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/875B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 张华集肖荔人张雯其他发明人请求不公开姓名
Owner FUJIAN NORMAL UNIV