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Expandable foaming microsphere capable of being post-crosslinked at high temperature and preparation method thereof

A foamed microsphere, high temperature technology, applied in the preparation of microspheres, microcapsule preparation, application, etc., can solve the problem of non-expansion, high temperature resistance and solvent resistance performance can not be significantly improved, expandable foamed microspheres expand problems such as low magnification, to achieve the effect of simple preparation process, solving high temperature collapse and irregularity and poor solvent resistance

Inactive Publication Date: 2020-09-18
运研材料科技(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] All known schemes are cross-linked before the expandable foamed microspheres are expanded, so that only a small amount of cross-linking agent (generally no more than 3%) can be added, and too little cross-linking agent can lead to high temperature resistance and Solvent resistance cannot be significantly improved, and too much crosslinking agent will cause the expansion ratio of expandable foamed microspheres to be too low or even not expand

Method used

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  • Expandable foaming microsphere capable of being post-crosslinked at high temperature and preparation method thereof
  • Expandable foaming microsphere capable of being post-crosslinked at high temperature and preparation method thereof
  • Expandable foaming microsphere capable of being post-crosslinked at high temperature and preparation method thereof

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preparation example Construction

[0067] In a preferred embodiment mode, the preparation method of the high temperature post-crosslinkable expandable foamed microspheres of the present invention comprises the following steps:

[0068] (1) Preparation of the oil phase: 30 parts by weight of isooctane and 30 parts by weight of isopentane, 200 parts by weight of acrylonitrile, 100 parts by weight of methyl methacrylate, 50 parts by weight of methacrylic acid, 60 parts by weight of methyl Hydroxyethyl acrylate, 36 parts by weight of blocked hexamethylene diisocyanate, and 4.7 parts by weight of azobisisobutyronitrile are mixed to obtain an oil phase;

[0069] (2) Preparation of the water phase: 100 parts by weight of magnesium hydroxide sol, 0.2 parts by weight of polyvinylpyrrolidone and 0.15 parts by weight of sodium nitrite are dispersed in 12000 parts by weight of a mass concentration of 16.7% sodium chloride aqueous solution to obtain water Phase, adjust the pH value of the aqueous phase to 3 with hydrochlori...

Embodiment 1-12 and comparative example 1-2

[0089] These examples prepare expandable foamed microspheres according to the following method:

[0090] (1) Preparation of oil phase: According to formula table 1 and table 2, mix and stir at 25°C for 10-15 minutes according to the corresponding raw materials and dosage to form a uniform oil phase;

[0091] (2) Preparation of the water phase: Dissolve the corresponding amount of deionized water in which the corresponding sodium chloride is dissolved in the formula table 1 and table 2, then add a corresponding amount of magnesium hydroxide solution, add a corresponding amount of polyvinylpyrrolidone aqueous solution or Sodium lauryl sulfate, then add a corresponding amount of 1% sodium nitrite aqueous solution and stir evenly, then add hydrochloric acid to adjust the pH to 3, and the formed solution is an aqueous phase;

[0092] (3) Homogenization of the water-oil phase: Pour the above-mentioned oil phase into the above-mentioned water phase, and disperse the mixed liquid in a...

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Abstract

The invention discloses an expandable foaming microsphere capable of being post-crosslinked at a high temperature and a preparation method thereof. The expandable foaming microsphere comprises a thermoplastic resin shell and a foaming agent, wherein the thermoplastic resin shell is provided with hydroxyl or amino and a sealed isocyanate curing agent, the foaming agent is encapsulated in the shell,and the boiling point of the foaming agent is not higher than the softening point of thermoplastic resin. The preparation method comprises the following steps: dispersing a polymeric monomer composition, which contains blocked isocyanate and is used for forming a shell, a polymeric monomer with hydroxyl or amino and other oil phases into a water phase under the action of a dispersing agent, initiating suspension polymerization by using an initiator, washing, dehydrating, and drying the polymerization product to obtain the expandable foaming microsphere capable of being post-crosslinked at a high temperature. The expandable foaming microsphere collapses at a high temperature and is small in irregular proportion and good in solvent resistance, and the preparation method is simple.

Description

technical field [0001] The present invention relates to heat-expandable microspheres, more specifically, to a kind of expandable foamed microspheres capable of high-temperature post-crosslinking and a preparation method thereof. Background technique [0002] Thermally expandable microspheres are polymer particles with a core-shell structure that expands when heated. The microspheres contain a permeable low-boiling hydrocarbon, while the outer shell consists of a gas-tight thermoplastic polymer that controls the release of hydrocarbons. At room temperature, the polymer shell is rigid. However, the shell softens when heated, while the hydrocarbons increase the internal pressure. Eventually the microsphere swells like a balloon and increases significantly in volume. Once the microspheres are cooled, the polymer shell remains rigid and expands, so the volume remains the same as it was when heated. This reduces the density of the microspheres from about 1100 kg·m-3 to about 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/32C08J9/14B01J13/14C08G18/80C08G18/62C09D11/00C09D7/40C09J11/00C08L27/06C08L101/00C08L75/04
CPCC08J9/32C08J9/141B01J13/14C08G18/80C08G18/6229C08G18/6283C09D11/00C09D7/40C09D7/70C09J11/00C08J2203/22C08J2327/06C08J2300/26C08J2375/04C08J2203/14
Inventor 周小三潘仕荣
Owner 运研材料科技(上海)有限公司
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