Polymer foaming microspheres as well as preparation method and application thereof

A technology of foaming microspheres and polymers, applied in the field of foaming materials, to achieve the effects of improving temperature resistance, improving dispersion, and increasing foaming ratio

Inactive Publication Date: 2021-12-17
陆筱棣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But in the prior art, polymer foam microspheres are applied to rubber to prepare rubber foam material less

Method used

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  • Polymer foaming microspheres as well as preparation method and application thereof
  • Polymer foaming microspheres as well as preparation method and application thereof
  • Polymer foaming microspheres as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0025] According to the present invention, a method for preparing polymer foamed microspheres is provided, the method comprising: preparing an oil phase mixture; preparing an aqueous dispersion medium, dispersing the oil phase mixture in the aqueous dispersion medium for suspension polymerization, and preparing the polymerized foamed microspheres.

[0026] According to the invention, the oil phase mixture comprises polymerizable monomers and a crosslinking agent.

[0027] According to the present invention, polymerizable monomers include nitrile-based monomers, carboxyl-containing monomers, vinyl halide-based monomers, (meth)acrylate-based monomers, acrylamide-based monomers, maleamide-based monomers, non- One or more of saturated monoolefin monomers, vinyl ketone monomers, N-vinyl monomers, vinyl naphthalene salts, etc.

[0028] According to the present invention, nitrile monomers such as acrylonitrile, methacrylonitrile, 2-methyl-2-propenyl, 2-chloroacrylonitrile, 2-ethoxya...

Embodiment approach

[0036] According to a preferred embodiment of the present invention, the polymerizable monomer comprises the following raw material components in weight ratio:

[0037] Nitrile monomer 40-90 parts by weight, preferably 45-85 parts by weight

[0038] Acrylamide monomer 1-30 parts by weight, preferably 5-25 parts by weight

[0039] The (meth)acrylate monomer is 5 to 40 parts by weight, preferably 10 to 30 parts by weight.

[0040] The present inventors found that the polymerizable monomer adopts nitrile monomer, (meth)acrylate monomer and acrylamide monomer to obtain higher foaming initiation temperature, and the obtained polymer foamed microsphere has High heat resistance and gas barrier properties.

[0041] According to a preferred embodiment of the present invention, the polymerizable monomers include acrylonitrile, methyl methacrylate, N,N-dimethylacrylamide.

[0042] According to the present invention, polymerizable monomers also include carboxyl-containing monomers, and...

Embodiment 1

[0123] 45g of acrylonitrile, 25g of N,N-methacrylamide, 30g of methyl methacrylate, 5g of sodium styrene sulfonate, 0.3g of allyl methacrylate, 10g of isopentane, 10g of isooctane, 10g of ethanol, 2g KH550 and 1g AIBN are mixed to obtain an oil phase mixture;

[0124] 200g of deionized water, 20g of magnesium hydroxide and 2g of polyvinylpyrrolidone were mixed, and then the pH was adjusted to 3.0 as an aqueous dispersion medium;

[0125] Mix the oil phase mixture and the aqueous dispersion medium, and disperse for 3 minutes at a speed of 10,000 rpm with a homomixer to obtain a suspension, then place the suspension in a polymerization reactor, replace it with nitrogen, and set the pressure of the polymerization reactor The temperature is 0.8MPa, the polymerization reaction temperature is 60°C, and the polymerization reaction time is 20h. Polymer foamed microspheres are obtained after polymerization.

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Abstract

The invention discloses polymer foaming microspheres as well as a preparation method and application thereof. The preparation method of the polymer foaming microspheres comprises the step of mixing and reacting an oil phase mixture with a water-based dispersion medium to obtain polymer expansion microspheres, wherein the oil phase mixture comprises a polymerizable monomer, a cross-linking agent and at least one foaming agent. The polymer foaming microspheres have a core-shell structure, with the polymer as a shell and the foaming agent as a core. A surfactant is introduced to the outside of the polymer, so that the dispersibility and fluidity of the polymer foaming microspheres are improved. The polymer foaming microspheres prepared by the invention can be directly applied to rubber, and can be directly foamed in the rubber vulcanization process without changing the existing rubber production process, so that the rubber density is reduced.

Description

technical field [0001] The present invention relates to the field of foaming materials, in particular to a polymer foaming microsphere and its preparation method and application. Background technique [0002] Thermally expandable polymer microspheres (polymer foamed microspheres) are a versatile multifunctional foaming material that can be used in inks, explosives and paper, and can also be used as fillers in rubber, plastics and coatings additives to reduce the weight of the material, improve the material's elasticity, sound and heat insulation. [0003] Polymer foamed microspheres have a structure in which a polymer shell coats a foaming agent, and polymer foamed microspheres are generally prepared by a suspension polymerization method. The application of the polymer foamed microspheres can be filled or other effects by adding the foamed polymer microspheres to other materials, and the unfoamed polymer microspheres can also be added to other materials. Microsphere foamin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/32C08L83/04C08L83/05C08L9/00C08L71/02C08L7/00C08K13/04C08K7/26C08K3/34C08K3/22C08K5/14C08K5/3492C08K3/38C08K5/5313C08F2/12B01J13/14
CPCC08J9/32C08J9/0061C08J9/0066C08J9/0095C08J9/0038C08J9/0023C08J9/0028C08F220/48C08F2/12B01J13/14C08J2203/22C08J2383/04C08J2483/05C08J2309/00C08J2471/02C08J2407/00C08J2205/044C08F220/54C08F220/14C08F212/30C08F220/40
Inventor 沈后平徐新连
Owner 陆筱棣
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