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CN-121991339-A - Composition for polyamide elastomer, preparation method and application thereof

CN121991339ACN 121991339 ACN121991339 ACN 121991339ACN-121991339-A

Abstract

The invention relates to the field of elastic fiber manufacturing, and discloses a composition for a polyamide elastomer, the polyamide elastomer, a preparation method and application thereof. The composition comprises a component A, polyether polyol and a component B, wherein the content of the polyether polyol is 15-95 parts by weight, the content of the component B is 0.5-4 parts by weight, the component B contains carbodiimide compounds, hindered phenol main antioxidants and phosphite ester auxiliary antioxidants, the content of the carbodiimide compounds is 0.5-2wt% of the total mass of the component A and the polyether polyol, and the total content of the hindered phenol main antioxidants and the phosphite ester auxiliary antioxidants is 0.3-2wt% of the total mass of the component A and the polyether polyol. The polyamide elastomer provided by the invention has excellent high-temperature melt stability.

Inventors

  • ZHAO SIQI
  • XU MENGJIN
  • GUO YINGJIE
  • HAN ZHENXING
  • PAN YU

Assignees

  • 沧州旭阳化工有限公司

Dates

Publication Date
20260508
Application Date
20260310

Claims (10)

  1. 1. A composition for polyamide elastomer is characterized by comprising a component A, polyether polyol and a component B; The polyether polyol is contained in an amount of 15 to 95 parts by weight and the component B is contained in an amount of 0.5 to 4 parts by weight relative to 60 parts by weight of the component A; The component A is amino alkyl acid salt and/or polyamide monomer salt; The component B contains carbodiimide compounds, hindered phenol main antioxidants and phosphite auxiliary antioxidants; The content of the carbodiimide compound accounts for 0.5-2wt% of the total mass of the component A and the polyether polyol, and the total content of the hindered phenol primary antioxidant and the phosphite secondary antioxidant accounts for 0.3-2wt% of the total mass of the component A and the polyether polyol.
  2. 2. The composition of claim 1, wherein the amino alkanoate is a nylon 12 salt and/or an amino caproate salt; and/or, the polyamide monomer salt is nylon 1010 salt; And/or the polyether polyol has a number average molecular weight of 600 to 3000; And/or the polyether polyol is selected from at least one of polytetramethylene ether glycol, polyethylene glycol and polypropylene glycol.
  3. 3. The composition according to claim 1 or 2, wherein the carbodiimide compound is selected from at least one of polycarbodiimide, N- (2, 6-diisopropylphenyl) carbodiimide, N-dicyclohexylcarbodiimide; and/or the hindered phenol main antioxidant is N, N' -bis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hexamethylenediamine and/or bis (3, 5-di-tert-butyl-4-hydroxy-phenylpropionyl) hydrazine; and/or the phosphite auxiliary antioxidant is at least one selected from 3, 5-di-tert-butyl-4-hydroxy benzene propionic acid isooctyl ester, tri (2, 4-di-tert-butylphenyl) phosphite ester and bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite ester.
  4. 4. Composition according to claim 1 or 2, wherein the content mass ratio of the hindered phenol based primary antioxidant to the phosphite based secondary antioxidant is 1:0.5-2.
  5. 5. The composition according to claim 1 or 2, wherein the composition further comprises a catalyst in an amount of 0.3 to 3 parts by weight relative to 60 parts by weight of the component A; And/or the catalyst is tetrabutyl titanate and/or tetrabutyl zirconate.
  6. 6. A process for preparing a polyamide elastomer, characterized in that it is carried out using the components of the composition according to any one of claims 1 to 5, said process comprising: (1) Carrying out pre-polycondensation reaction on a mixed system containing the component A, the polyether polyol and the component B in an inert atmosphere to obtain an intermediate product, wherein the mass content of water in the mixed system is less than 10ppm; The component B contains carbodiimide compounds, hindered phenol main antioxidants and phosphite auxiliary antioxidants; (2) And (3) carrying out vacuum final polycondensation reaction on the intermediate product, and stopping the reaction when the molecular weight of the intermediate product reaches 18000-25000 to obtain the polyamide elastomer.
  7. 7. The method of claim 6, further comprising performing the pre-polymerization in the presence of a catalyst.
  8. 8. The method according to claim 6 or 7, wherein the conditions for the pre-polycondensation reaction comprise a temperature of 210 to 260 ℃, a heating rate of 1 to 2 ℃ per minute, a pressure of 0.1 to 0.5MPa, and a time of 0.5 to 2 hours; And/or the conditions of the vacuum final polycondensation reaction include a temperature of 220-260 ℃ and a pressure of <100Pa; and/or, before the vacuum polycondensation reaction is carried out, gradually reducing the pressure of the reaction system to the level of carrying out the vacuum polycondensation reaction, wherein the pressure reduction rate is 0.1-2KPa/s.
  9. 9. A polyamide elastomer prepared by the process of any one of claims 6-8.
  10. 10. Use of the composition for polyamide elastomer according to any one of claims 1 to 5, the polyamide elastomer according to claim 9 for the preparation of side-by-side elastic fibers.

Description

Composition for polyamide elastomer, preparation method and application thereof Technical Field The invention relates to the field of elastic fiber manufacturing, in particular to a composition for a polyamide elastomer, the polyamide elastomer, a preparation method and application thereof. Background In the elastic fiber manufacturing industry, parallel composite spinning technology has gradually developed into a key process for producing high-performance elastic fabrics. The technology combines two polymers with obvious difference of heat shrinkage rate in a parallel mode through a special spinning component, and makes use of different heat shrinkage behaviors of the two components to spontaneously form a permanent and stable three-dimensional spiral curled structure. The fiber (such as the common T400 fiber in the market) and the fabric thereof prepared by the method have excellent elastic recovery rate, fluffy hand feeling and comfortable wearing experience, and meanwhile, the inherent defects of easy aging, poor chlorine resistance, difficult dyeing and the like of the traditional spandex fiber are avoided, so that the fiber can be widely applied to high-end clothing fabrics. Polyamide elastomers, which are block copolymers composed of polyamide hard segments and polyether soft segments, are considered as one of the potential candidates for the preparation of the aforementioned side-by-side elastic fibers because of their excellent flexibility, light weight properties, excellent low temperature resistance and chemical resistance. However, in the specific process context of side-by-side spinning, extremely stringent requirements are placed on the degree of melt viscosity matching of the two polymer components and their stability at high temperatures. The ester bond and ether bond in the molecular chain of the polyamide elastomer are extremely easy to generate two degradation reactions of thermooxidative degradation and hydrolytic degradation at the melt processing temperature exceeding 260 ℃, and the molecular weight of the polyamide elastomer is obviously reduced in the spinning process, and the specific characteristics are that the melt strength is sharply reduced, the melt flow index is increased and the fluctuation is severe. Melt instability can cause a series of serious production problems and end product defects, mainly including: 1. The discontinuous spinning process is that the filament is easy to break when spinning at high speed due to insufficient melt strength, so that stable and continuous industrial production can not be realized, and the production efficiency is severely restricted. 2. The curling performance is poor, namely, shrinkage force between the elastic body component and another component (such as nylon 6) is out of alignment due to instability of melt rheological behavior of the elastic body component, and finally, irregular fiber curling form and large fluctuation range of curling frequency and shrinkage rate are caused, so that the elasticity effect after weaving is affected. 3. The appearance of the fiber does not reach the standard, namely, the surface of the nascent fiber is not smooth and has a lot of broken filaments caused by melt fracture, and the smooth proceeding of the subsequent weaving process and the quality of the final fabric are directly affected. CN117661150a discloses a variety of parallel composite fiber schemes involving polyamides, the invention focus mainly on screening and combining polymer types (e.g. using bio-based polyamides to improve sustainability, hygroscopicity and crimping properties of materials), but there is no report on solving the melt stability problem faced by polyamide elastomers when subjected to high temperature history of spinning process. CN120098326a discloses that stability compounding with copper salt, hindered amine, phosphite and hindered phenol improves spinning performance by improving fiber strength and melt stability, reduces the breakage rate in the spinning process, and the melt pressure is more stable, but the introduction of copper salt can affect the resin color. CN120026406a discloses a degradation-resistant reinforced PLA filament and a preparation method thereof, and a 'post-addition' mode of simple physical blending with polymer chips is adopted, so that the harsh requirement of a parallel spinning process on long-term accurate matching of melt viscosity cannot be met. Disclosure of Invention The invention aims to provide a polyamide elastomer with excellent high-temperature melt stability. In order to achieve the above object, a first aspect of the present invention provides a composition for a polyamide elastomer, comprising a component A, a polyether polyol and a component B; The polyether polyol is contained in an amount of 15 to 95 parts by weight and the component B is contained in an amount of 0.5 to 4 parts by weight relative to 60 parts by weight of the component A; The component A is amino alkyl acid sal