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PA6 type thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and polyetheramine technology, applied in the field of PA6 thermoplastic elastomer and its preparation, can solve the problems of slow reaction speed, increase of by-products, decrease of average molecular weight, etc., and achieve high production efficiency, not easy to break, and simple process Effect

Inactive Publication Date: 2015-12-30
FUJIAN JINJIANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The reaction mechanism commonly used in the dibasic acid method includes the esterification reaction mechanism of terminal hydroxyl and carboxyl terminal reactions, which requires high temperature and high vacuum conditions (20-50Pa), which will promote the decomposition of polyamide segments during the reaction process. The polyamide monomer causes the molecular chain to break, the average molecular weight decreases, the by-products increase, and the product quality decreases. At the same time, the reaction speed is relatively slow, which affects production efficiency.
These problems restrict the large-scale production of PA6 thermoplastic elastomers

Method used

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Examples

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preparation example Construction

[0014] The present invention also provides a preparation method of PA6 type thermoplastic elastomer, comprising the following steps: adding 4-40 parts of polyetheramine, 50-94 parts of caprolactam, 0.5-2 parts of dibasic acid and 1-8 parts of ring-opening agent, firstly react for 4-7h under the condition of 0.25-0.55Mpa, then react for 5-8h under the condition of normal pressure, and then react for 1-3h under the condition of 0-0.05Mpa, control the reaction temperature and keep it at 240 ~ 270 ℃, and finally through boiling water extraction and vacuum drying process to get PA6 thermoplastic elastomer.

[0015] In the present invention, the amino-terminated polyether, dibasic acid, and caprolactam in a certain weight ratio are kept at 240-270°C under the action of a ring-opening agent. The segment is not easy to break, so that the molecular weight of the final product is high, the process is simple and the production efficiency is high. The prepared PA6 thermoplastic elastomer ...

Embodiment 1

[0024] Add 4kg of polyetheramine, 50kg of caprolactam, 0.5kg of terephthalic acid and 1kg of omega-aminocaproic acid in the polymerization kettle as follows, the polyetheramine is polyethylene oxide with a molecular weight between 1000 and 3000 base polyetheramine, firstly reacted for 4h under the condition of 0.25Mpa, then reacted for 5h under the condition of normal pressure, then reacted for 1h under the condition of 0Mpa, controlled the reaction temperature to keep at 240°C, and finally went through the boiling water extraction and vacuum drying process. A PA6-type thermoplastic elastomer in which the polyetheramine soft segment accounts for 4% of the total mass and the PA6 hard segment accounts for 95.5% of the total mass is obtained.

[0025] After testing, its molecular weight is 35000g / mol, its tensile strength is 57Mpa, its elongation at break is 260%, and its Shore hardness is 65D.

Embodiment 2

[0027] Add 40kg of polyetheramine, 94kg of caprolactam, 2kg of malonic acid and 8kg of omega-aminocaproic acid in the polymerization kettle as follows. Alcohol-based polyether amine, first reacted for 7 hours under the condition of 0.55Mpa, then reacted for 8h under the condition of normal pressure, and then reacted for 3h under the condition of 0.05Mpa. A PA6 thermoplastic elastomer in which the polyetheramine soft segment accounts for 25% of the total mass and the PA6 hard segment accounts for 74.5% of the total mass can be obtained.

[0028] After testing, its molecular weight is 45000g / mol, its tensile strength is 50Mpa, its elongation at break is 460%, and its Shore hardness is 50D.

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Abstract

The invention provides a PA6 type thermoplastic elastomer with high molecular weight, good elasticity and adjustable hardness, and a preparation method thereof. The method comprises the following steps: adding 4-40 parts by weight of polyetheramine, 50-94 parts by weight of caprolactam, 0.5-2 parts by weight of diacid and 1-8 parts by weight of a ring opening agent to a reactor, reacting under 0.25-0.55Mpa for 4-7h, reacting under normal pressure for 5-8h, reacting under 0-0.05Mpa for 1-3h, controlling the reaction temperature to be always in a range of 240-270DEG C, carrying out boiling water extraction, and carrying out vacuum drying to obtain the PA6 type thermoplastic elastomer. Certain temperature maintenance and pressure change of amino-terminated polyether, the diacid and caprolactam are carried out under the action of the ring opening agent, so the method has the advantages of simple process and high production efficiency, and the obtained PA6 type thermoplastic elastomer has the advantages of high molecular weight, good elasticity and adjustable Shore hardness.

Description

technical field [0001] The invention relates to a PA6 thermoplastic elastomer and a preparation method thereof, in particular to a PA6 thermoplastic elastomer obtained by copolymerization of polyetheramine, dibasic acid and caprolactam under the action of a ring-opening agent and a preparation method thereof. Background technique [0002] Polyamide thermoplastic elastomer is a kind of thermoplastic elastomer with excellent performance and wide application. Its molecular chain is composed of hard segment composed of polyamide and soft segment composed of polyether. The molecular weight of each segment generally does not exceed 4000, and each molecular chain is generally larger than a triblock. Among polyamide thermoplastic elastomers, PA6-type thermoplastic elastomers have better comprehensive properties than other thermoplastic elastomers. They can be used as super-tough heat-resistant engineering plastics and can also be made into high-strength elastic fibers. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/40
Inventor 易春旺吴华新张瑞瑞
Owner FUJIAN JINJIANG TECH
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