Low-shrinkage long-carbon-chain polyamide elastomer foamed bead as well as preparation method and application thereof

A technology of carbon chain polyamide and foamed beads, which is applied in the production of bulk chemicals, etc., can solve the problems of low shrinkage rate of foamed beads, easy shrinkage of foamed beads, and low crystallization temperature, and achieve the size and volume Uniformity, low shrinkage, and improved melt strength

Active Publication Date: 2022-04-12
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art. The present invention provides a kind of low shrinkage long carbon chain polyamide elastomer (LCPAE) foamed beads and its preparation method and application, prepared by the preparation method provided by the present invention The long carbon chain polyamide elastomer foamed beads have a lower shrinkage rate, which overcomes the low crystallization temperature and slow crystallization speed of the existing low-hardness LCPAE materials, which lead to the use of such materials for supercritical foaming and foaming beads Easy to shrink the problem, thereby improving production efficiency and reducing costs

Method used

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  • Low-shrinkage long-carbon-chain polyamide elastomer foamed bead as well as preparation method and application thereof
  • Low-shrinkage long-carbon-chain polyamide elastomer foamed bead as well as preparation method and application thereof
  • Low-shrinkage long-carbon-chain polyamide elastomer foamed bead as well as preparation method and application thereof

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Embodiment 1

[0060] In the present embodiment, the specific steps for preparing long carbon chain polyamide elastomer (LCPAE) foamed beads (A1) are as follows:

[0061]Preparation of long carbon chain polyamide elastomer: Add 207kg of dodecyl dibasic acid and 102kg of decanediamine in a 1500L high-pressure reactor, replace the air in the reactor with nitrogen flow for 10min, and heat to 250°C under nitrogen flow atmosphere , and close the nitrogen flow after 1h, keep the reactor in an airtight state, and the mixed materials continue to react in the reactor for 1h. Then vacuumize to reduce the pressure in the reactor to -98kPa, dehydrate and keep the vacuum for 30 minutes, then stop the vacuum, then use nitrogen to return to a state slightly greater than atmospheric pressure, and then add 300.0kg PTMEG2000 and catalyst tetrabutoxyl to the reactor Titanium 0.05kg, 1098 antioxidant 1kg. Heating to 250°C under nitrogen atmosphere and stirring for 30 minutes, then evacuating to -98kPa, reactin...

Embodiment 2

[0067] In the present embodiment, the specific steps of preparing long carbon chain polyamide elastomer (LCPAE) foamed beads (B1) are as follows:

[0068] Preparation of long carbon chain polyamide elastomer: Add 232.0kg tetradecanedioic acid and 120.0kg dodecyl diamine into a 1500L high-pressure reactor, replace the air in the reactor with nitrogen flow for 10min, and Heating to 250°C, and closing the nitrogen flow after 1 hour, keeping the reactor in a sealed state, and continuing to react the mixed material in the reactor for 2 hours. Then vacuumize to reduce the pressure in the reactor to -98kPa, dehydrate and keep the vacuum for 30 minutes, then stop vacuuming, then use nitrogen to return to a state slightly greater than atmospheric pressure, and then add 600kg of PTMEG 3000 and catalyst tetrabutoxyl to the reactor Titanium 0.05kg, 1098 antioxidant 1kg. Heating to 255°C under nitrogen atmosphere and stirring for 30 minutes, then evacuating to -98kPa, reacting at constant...

Embodiment 3

[0074] In the present embodiment, the specific steps of preparing long carbon chain polyamide elastomer (LCPAE) foamed beads (A2) are as follows:

[0075] Add 1 kg of the ellipsoidal long carbon chain polyamide elastomer foamed particles obtained in Example 1 and 2 kg of water into a 30L high-pressure foaming kettle, and start stirring at a speed of 10 r / min. The foaming conditions are set with reference to Table 1. Then inject high-pressure CO through the plunger pump 2 , while heating, when the temperature in the kettle reaches 132°C and the pressure reaches 25MPa, stop pressurizing and heating. Heat preservation and pressure for 60 minutes to make the foamed particles of the long carbon chain polyamide elastomer reach saturation, and obtain a polymer-supercritical fluid homogeneous system.

[0076] Open the discharge valve at the bottom of the autoclave, and foam the polymer-supercritical fluid homogeneous system at a rate of 30 MPa / min to obtain LCPAE foamed beads (A2). ...

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Abstract

The invention provides a low-shrinkage long-carbon-chain polyamide elastomer foamed bead as well as a preparation method and application thereof. According to the preparation method, the foamed bead is prepared from a long-carbon-chain polyamide elastomer formed by polycondensation of a polyamide hard segment and a polyether soft segment, wherein the carbon atom number of diamine and the carbon atom number of binary acid are 2N2 (N + 1) types. The binary acid aliphatic chain and the diamine aliphatic chain of the polyamide hard segment structure of the 2N2 (N + 1) type long carbon chain polyamide elastomer prepared by the method have the same methylene number, so that spatial arrangement in which methylene chain segments are completely symmetrical can be formed, and more regular hydrogen bond interaction is formed between amido bonds. Therefore, the long-carbon-chain polyamide elastomer has higher crystallization temperature and higher crystallization rate, and the foamed beads of the long-carbon-chain polyamide elastomer are low in shrinkage rate and good in structural stability. The foaming material prepared from the foaming bead has the characteristics of soft texture, good damping property, high resilience, small permanent deformation, low density and the like, and can be widely applied to the fields of high-grade shoe materials, damping packaging and the like.

Description

technical field [0001] The invention belongs to the technical field of high polymer material foaming, and in particular relates to a low-shrinkage long carbon chain polyamide elastomer foaming bead and its preparation method and application. Background technique [0002] Long chain polyamide elastomer (long chain polyamide elastomer), referred to as "LCPAE", is a kind of alternating block polymer with long chain polyamide as hard segment and polyether as soft segment. LCPAE has both the excellent elasticity of rubber and the excellent processability of plastics. By adjusting the composition of soft and hard segments of LCPAE, a series of LCPAE with different hardness can be obtained. LCPAE combines the advantages of long carbon chain polyamide and polyether, and has excellent comprehensive properties such as good processability, wear resistance, solvent resistance, and high resilience. It can be widely used in sporting goods, fabric coating, medical equipment and toys and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08J9/12C08L77/06
CPCY02P20/54
Inventor 董侠朱平王笃金赵莹苗晓亮杜辉韩永志戚成成
Owner INST OF CHEM CHINESE ACAD OF SCI
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