CN100465231C

CN100465231C - Heat resistant nylon material containing thormotropic liquid crystal polymer and its preparation method

Info

Publication number: CN100465231C
Application number: CNB2006100371632A
Authority: CN
Inventors: 赵建青; 吴水珠; 叶华; 刘述梅
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2006-08-24
Filing date: 2006-08-24
Publication date: 2009-03-04
Anticipated expiration: 2026-08-24
Also published as: CN1912003A

Abstract

The present invention discloses one kind of heat resistant nylon material containing thermal liquid crystal polymer. The heat resistant nylon material consists of nylon-6 slice 60-70 wt%, thermal liquid crystal polymer 25-35 wt%, cross-linking agent 4.5 wt% and antioxidant 0.5 wt%. Its preparation process includes the steps of: mixing all the components via stirring, extruding at 250 deg.c or 260 deg.c, drawing, pelletizing and injection molding. The heat resistant nylon material has Vicat softening point up to 230 deg.c and high melt flow rate, and may be used in making different kinds of heat resistant nylon parts.

Description

A kind of heat-resisting nylon material that contains TLCP and preparation method thereof

Technical field

The invention belongs to heat-resisting nylon material field, relate in particular to a kind of heat-resisting nylon material that contains TLCP and preparation method thereof.

Background technology

TLCP is owing to the polymer segment crystalline texture that added heat collapse and makes non-crystal structure enter molten state to be certain ordered arrangement and liquid crystal state occurs.It is a kind of novel high performance polymer material, be characterized in modulus height, intensity height, under liquid crystal state, present distinctive easy mobility, good thermostability and dimensional stability, chemical proofing and weathering resistance, outstanding solvent resistance, excellent comprehensive performances such as lower coefficient of linear expansion and density.Utilize the characteristics of TLCP,, then can improve the performance of thermoplastic engineering plastic itself and thermoplastic engineering plastic blending and modifying.In TLCP-thermoplastic engineering plastic blending modification system, TLCP has three kinds of significantly effects: the 1. effect of toughener, and the fibrillation surface of formation and length-to-diameter ratio are than the height of common fortifying fibre, thereby reinforced effects is very remarkable; 2. process the effect of flow ability modifying agent, can reduce the viscosity of blend melt, improve the flowability and the moulding processability of unmanageable thermoplastics; 3. save the forming process energy consumption and reduce product cost.In addition, TLCP also can be improved the resistance toheat of thermoplastic engineering plastic.But, in the mixed and modified process of TLCP and thermoplastic engineering plastic, because the difference of both consistencies occurs easily being separated, thereby causes the performance of thermoplastic engineering plastic not only not improve, on the contrary variation.For this reason, development has the TLCP and the thermoplastic engineering plastic system of excellent compatibility, to satisfy the needs of market to heat-resistant engineering plastic, is highly significant.

Chinese patent CN1168395A discloses liquid crystalline polymers and oxy-poly-arylene sulfide mixed and modified, has the material of good anti-nonferromagnetic substance with preparation, and this material can be used for making parts such as gear, tooth bar, bearing.

Chinese patent 03126409.3 discloses a kind of matrix material that contains granular filler and TLCP, and its preparation method is with granular fillers such as hollow glass micro-ball and the complete fragrant liquid crystalline polymer blend modification of main chain, at 260～280 ℃ of following extruding pelletizations; Thereby the matrix material that acquisition has good dimensional stability, this matrix material can be used for making the meticulous plastic part of structure.

Chinese patent CN1357575A discloses a kind of bearing materials, its preparation method be with thermally stable polymer polyphenylene sulfide, TLCP, propylene aralkyl-phenol resin, graphite and molybdenum dioxide mix by a certain percentage, extrude, granulation; This material can be used for making bearing part.

More than three patents be not to be used to prepare the heat-resisting nylon material.

Summary of the invention

The object of the present invention is to provide a kind of heat-resisting nylon material that contains TLCP and preparation method thereof, the advantageous property that utilizes TLCP with preparation have excellent heat resistance can nylon material.In preparation process, utilize coupling agent to improve consistency between TLCP and the Nylon 6, have the excellent comprehensive performance to guarantee prepared material.The heat-resisting nylon material of the present invention's preparation can be used for making the heat-resisting nylon plastic components.

Purpose of the present invention can realize by following technical solution.

The heat-resisting nylon material that contains TLCP of the present invention is made up of nylon 6 slice, TLCP, coupling agent, oxidation inhibitor; Nylon 6 slice, TLCP, coupling agent, oxidation inhibitor are by weight than being 60～70:25～35:4.5:0.5.

Described nylon 6 slice is the section of engineering plastics level nylon 6.

Described TLCP is the Vectra A type TLCP of U.S. Goodfellow company production or the Zenite type TLCP that U.S. Dupont company produces.

Described coupling agent is the A-1100 type coupling agent of U.S.'s union carbide corporation production or the Fusabond type coupling agent of U.S. Dupont company.

Described oxidation inhibitor is the Luchemao-R type hindered phenol antioxygen that U.S. big lake company produces.

The heat-resisting nylon preparation methods that contains TLCP of the present invention may further comprise the steps:

(1) be that nylon 6 slice, TLCP, coupling agent, the oxidation inhibitor of 60～70:25～35:4.5:0.5 mixes under agitation condition with weight part ratio;

(2) under 250 ℃ or 260 ℃, extrude, traction, granulation, and injection moulding is made sample and is obtained the heat-resisting nylon material.

The present invention compared with prior art has following advantage and beneficial effect:

(1) TLCP during heat-resisting nylon material of the present invention is formed with the nylon 6 slice extrusion in, in the Nylon 6 matrix, form microfibrillar structure, thereby reduce the melt viscosity of Nylon 6, improve melt flow rate (MFR), and then improve processing characteristics;

(2) adding of coupling agent has improved the consistency between TLCP and the nylon-6 matrix body resin, help forming homodisperse phase structure, avoid the generation that is separated, thereby make prepared matrix material both can show the excellent heat resistance energy of thermotropic liquid crystal, have excellent comprehensive performances simultaneously again;

(3) adding of oxidation inhibitor can avoid material oxidative degradation and consequent degradation to occur in the course of processing.

Embodiment

In order to understand the present invention better, the present invention is done to describe further below in conjunction with embodiment.

Embodiment 1

By weight, take by weighing 70 parts of nylon 6 slices (the engineering plastics level nylon 6 section that Mei Da limited-liability company produces is newly understood in Guangdong), 25 parts of Vectra A type TLCP (production of U.S. Goodfellow company), 4.5 parts of A-1100 type coupling agents (U.S.'s union carbide corporation is produced), 0.5 part of Luchemao-R type hindered phenol antioxygen (production of U.S. big lake company); Under agitation condition, above-mentioned component is mixed, then the gained mixture is extruded under 250 ℃ in forcing machine, traction, granulation, and injection moulding makes sample, carry out performance test.The resistance toheat of sample is according to the test of " mensuration of GB/T1633 thermoplastics vicat softening temperature (VST) " method, and its dimension card heat resisting temperature is 230 ℃; The melt flow rate (MFR) raising rate of sample is according to " GB3682-83 thermoplastics melt flow rate (MFR) test method " test, and the melt flow rate (MFR) raising rate of sample is 13%.

Embodiment 2

By weight, take by weighing 60 parts of nylon 6 slices (the engineering plastics level nylon 6 section that Mei Da limited-liability company produces is newly understood in Guangdong), 35 parts of Zenite type TLCP (production of U.S. Dupont company), 4.5 parts of Fusabond type coupling agents (production of U.S. Dupont company), 0.5 part of Luchemao-R type hindered phenol antioxygen (production of U.S. big lake company); Under agitation condition, above-mentioned component is mixed, then the gained mixture is extruded under 260 ℃ in forcing machine, traction, granulation, and injection moulding makes sample, carry out performance test.The resistance toheat of sample is according to the test of " mensuration of GB/T1633 thermoplastics vicat softening temperature (VST) " method, and its dimension card heat resisting temperature is 230 ℃; The melt flow rate (MFR) raising rate of sample is according to " GB3682-83 thermoplastics melt flow rate (MFR) test method " test, and the melt flow rate (MFR) raising rate of sample is 15%.

Embodiment 3

By weight, take by weighing 65 parts of nylon 6 slices (the engineering plastics level nylon 6 section that Mei Da limited-liability company produces is newly understood in Guangdong), 30 parts of Vectra A type TLCP (production of U.S. Goodfellow company), 4.5 parts of Fusabond type coupling agents (production of U.S. Dupont company), 0.5 part of Luchemao-R type hindered phenol antioxygen (production of U.S. big lake company); Under agitation condition, above-mentioned component is mixed, then the gained mixture is extruded under 260 ℃ in forcing machine, traction, granulation, and injection moulding makes sample, carry out performance test.The resistance toheat of sample is according to the test of " mensuration of GB/T1633 thermoplastics vicat softening temperature (VST) " method, and its dimension card heat resisting temperature is 230 ℃; The melt flow rate (MFR) raising rate of sample is according to " GB3682-83 thermoplastics melt flow rate (MFR) test method " test, and the melt flow rate (MFR) raising rate of sample is 15%.

Claims

1. a heat-resisting nylon material that contains TLCP is characterized in that being made up of nylon 6 slice, TLCP, coupling agent, oxidation inhibitor; Than being 60～70:25～35:4.5:0.5, described nylon 6 slice is the section of engineering plastics level nylon 6 by weight for nylon 6 slice, TLCP, coupling agent, oxidation inhibitor; Described TLCP is the VectraA type TLCP of U.S. Goodfellow company production or the Zenite type TLCP that U.S. Dupont company produces; Described coupling agent is the A-1100 type coupling agent of U.S.'s union carbide corporation production or the Fusabond type coupling agent of U.S. Dupont company; Described oxidation inhibitor is the Luchemao-R type hindered phenol antioxygen that U.S. big lake company produces.

2. the described heat-resisting nylon preparation methods that contains TLCP of claim 1 is characterized in that step is as follows:

(1) be that described nylon 6 slice, TLCP, coupling agent, the oxidation inhibitor of 60～70:25～35:4.5:0.5 mixes under agitation condition with weight part ratio;