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High temperature expanded polymer microspheres and preparation method thereof

A high-temperature expansion and polymer technology, which is applied in the field of high-temperature expansion polymer microspheres and its preparation, can solve the problems of low expansion ratio, insufficient heat resistance, low foaming agent coating rate, etc., and achieve good heat resistance and crystallization performance, excellent barrier performance and air tightness, and the effect of small film permeability coefficient

Active Publication Date: 2020-11-27
SHANDONG RUIFENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the prior art, the heat-expandable polymer microspheres prepared by the suspension polymerization method still have the following deficiencies, and it is difficult to obtain high-temperature expansion polymer microspheres:
[0009] 1. Uneven particle size distribution
[0010] 2. The thermoplastic resin shell polymer of heat-expandable polymer microspheres has poor heat resistance, which leads to yellowing and rupture of heat-expandable microspheres during resin foaming processing
[0011] 3. The core-structure is incomplete, and the coverage rate of the foaming agent is low
[0012] 5. The heat resistance of the product is not good enough
[0013] 6. The expansion ratio is low, and the temperature range of foam stabilization is not wide enough
[0014] 7. The suspension polymerization reaction time in the prior art is as long as 20 hours, resulting in uneven particle size distribution of the product and low foaming agent coating rate
and increased production costs

Method used

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  • High temperature expanded polymer microspheres and preparation method thereof
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  • High temperature expanded polymer microspheres and preparation method thereof

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Embodiment 1~12

[0111] The high temperature expansion polymer microspheres of the present invention are prepared according to the following steps

[0112] 1. Preparation of Aqueous Dispersion Compositions

[0113] ① Preparation of raw material aqueous solution

[0114] a. Preparation of dispersant solution

[0115] In 160 parts by weight of deionized water, add 0.12 to 1 part by weight of dispersant, dissolve, stir evenly, and set aside;

[0116] b. Preparation of aqueous polymerization inhibitor solution

[0117] In 350 parts by weight of deionized water, add 36 to 120 parts by weight of sodium chloride, dissolve, and set aside;

[0118] c.. Preparation of dispersing aid sodium nitrite aqueous solution

[0119]A 1wt% sodium nitrite aqueous solution was prepared with deionized water, for subsequent use;

[0120] d. Preparation of hydrazine hydrate aqueous solution

[0121] Prepare a 1wt% hydrazine hydrate aqueous solution with deionized water, for subsequent use;

[0122] e. Preparatio...

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Abstract

The invention provides high-temperature expanded polymer microspheres and a preparation method thereof and belongs to expandable particles. The high-temperature expanded polymer microspheres are prepared from a thermoplastic resin shell body and a foaming agent packaged in the shell body, wherein an oil-phase composition composed of a polymerizable monomer and a crosslinking agent can be dispersedinto a water-phase dispersed composition; in the presence of the foaming agent, the polymer microspheres coated with the foaming agent are directly prepared through carrying out suspension polymerization reaction and coating the foaming agent in situ; the high-temperature expanded polymer microspheres are characterized in that the oil-phase composition contains the polymerizable monomer and the crosslinking agent, and also comprises a silane coupling agent; the foaming agent is a mixture of isopentane, isooctane and n-octane; the high-temperature expanded polymer microspheres provided by theinvention have the advantages of complete core-shell structure, uniform grain diameter distribution, high foaming agent coating efficiency, good heat resistance of a shell-layer polymer, relatively high initial temperature in an expansion process, relatively high highest expansion temperature and high foaming ratio, have a relatively wide foam stabilizing temperature range, and are suitable for being applied to a thermoplastic resin, rubber or thermoplastic elastomer foaming and processing technology.

Description

technical field [0001] The present invention is a high-temperature expansion polymer microsphere and a preparation method thereof. are expandable particles. Background technique [0002] Thermally expandable polymer microspheres are a versatile and versatile foam material. It is an extremely small spherical particle with a shell-core structure. The inner core of the microsphere is a liquid low-boiling alkane, and the shell of the microsphere is a thermoplastic polymer with good air tightness that can prevent the escape of the substance in the core. At room temperature, the shell of the microspheres is hard and the particles are tiny. When heated, when the heating temperature is higher than the glass transition temperature of the shell, the shell material softens and the inner core material vaporizes to generate internal pressure, causing the microspheres to expand. volume increased significantly. The particle size of the microspheres before expansion is generally 5-100μ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/20C08F220/46C08F220/14C08F220/06C08F220/18C08F212/10C08F214/04C08F222/14C08F2/18C08F2/20C08J9/228C08L27/06C08L25/06C08L23/06C08L23/12C08L75/04C08L61/06
CPCC08F2/18C08F2/20C08F220/06C08F220/14C08F220/46C08J9/20C08J9/228C08J2323/06C08J2323/12C08J2325/06C08J2327/06C08J2361/06C08J2375/04C08J2435/02C08F220/1804C08F212/10C08F214/04C08F222/102C08F222/103
Inventor 刘春信张振国张海瑜冯智刚焦淑元
Owner SHANDONG RUIFENG CHEM
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