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Method for foaming polymer microspheres with two-component or multi-component foaming agent under low pressure

A technology of polymer and foaming agent, which is applied in the field of foaming materials, can solve the problems of low temperature and low temperature, such as microballoons that cannot be formed and burst.

Active Publication Date: 2010-11-24
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current polymer microspheres generally use a foaming agent or several mixed foaming agents with very different boiling points. They have very strict requirements on the foaming temperature of the operation, and it is easy to cause microspheres to fail to foam at low temperatures, and When the temperature is high, the microspheres will burst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (1) Preparation of polymer microspheres

[0078] Take 7.5 g of colloidal titanium dioxide, 0.1 g of oleic acid, 22.5 g of sodium chloride, 1 g of 1:10 hydrochloric acid, and 75 g of deionized water to form an aqueous dispersion medium system. 33g of acrylonitrile, 3.7g of methacrylonitrile, 1.0g of methyl acrylate, 1.0g of bifunctional crosslinking agent triethylene glycol dimethacrylate, 4g of n-pentane, 6g of cyclohexane, and azobis Isobutyronitrile 0.07 g constitutes a polymerizable mixture.

[0079] The formed polymerizable mixture and the water-based dispersion medium are stirred and mixed in a homogenizer, so that the polymerizable mixture forms tiny droplets and disperses in the water phase. The micro droplet diameter is 15-20μm, and the dispersion coefficient is 1.3%. Add the water-based dispersion medium containing the tiny droplets of the polymerizable mixture into the polymerization kettle with a stirrer, under N 2 The reaction was carried out at 70° C. fo...

Embodiment 2

[0083] (1) Preparation of polymer microspheres

[0084] Take 5 g of colloidal titanium dioxide, 0.5 g of a 10% aqueous solution of sodium oleate, 30 g of sodium chloride, 1 g of 1:10 hydrochloric acid, and 80 g of deionized water to form an aqueous dispersion medium system. In addition, 35g of acrylonitrile, 4g of methacrylonitrile, 1.2g of methyl acrylate, 1.5g of bifunctional crosslinking agent triethylene glycol dimethacrylate, 5g of n-hexane, 5g of isooctane, and azobis Isobutyronitrile 0.1 g constitutes a polymerizable mixture.

[0085] The polymerizable mixture and the water-based dispersion medium are stirred and mixed in a homogenizer, so that the polymerizable mixture forms fine droplets and disperses in the water phase. The micro droplet diameter is 12-15μm, and the dispersion coefficient is 1.7%. Add the water-based dispersion medium containing the tiny droplets of the polymerizable mixture into the polymerization kettle with a stirrer, under N 2 The reaction was...

Embodiment 3

[0089] (1) Preparation of polymer microspheres

[0090] Take 9 g of colloidal silicon dioxide, 0.8 g of a 10% aqueous solution of diethanolamine-itaconic acid polycondensate, 20 g of sodium chloride, 1.5 g of 1:10 hydrochloric acid, and 70 g of deionized water to form an aqueous dispersion medium system. In addition, a polymerizable mixture containing 4 g of n-pentane, 5 g of n-hexane and the same content of other monomers as in Example 2 was prepared.

[0091] The polymerizable mixture and the water-based dispersion medium are stirred and mixed in a homogenizer, so that the polymerizable mixture forms fine droplets and disperses in the water phase. The micro droplet diameter is 15-20μm, and the dispersion coefficient is 1.5%. Add the water-based dispersion medium containing the tiny droplets of the polymerizable mixture into the polymerization kettle with a stirrer, under N 2 The reaction was carried out at 70° C. for 12 hours under the atmosphere. The product was repeated...

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Abstract

The invention relates to a method for foaming polymer microspheres with two-component or multi-component foaming agent under a low pressure and a foamed material obtained by the method. The polymer microspheres are comprised of a polymer serving as shells and foaming agent serving as a nuclear, wherein the polymer shells may be formed by the polymerization of a polymerizable monomer and a crosslinking agent; and the foaming agent consists of two or more components between which the boiling point difference is 10 to 100 DEG C, preferably 20 to 90 DEG C and more preferably 30 to 80 DEG C. When the outside pressure is less than a standard atmosphere, preferably 0.5 to 0.8 standard atmosphere, and the temperature is 100 to 180 DEG C, preferably 110 to 170 DEG C and more preferably 120 to 160 DEG C, the polymer microspheres begin to foam to form foamed material of which the foaming expansion ratio is no less than 20 times.

Description

technical field [0001] The invention relates to a low-pressure foaming method of polymer microspheres containing a binary or multi-element foaming agent and a foaming material obtained therefrom. In the foaming process, two or more foaming agents can play a synergistic effect. The low-pressure foaming method is used to reduce the foaming temperature of the polymer microspheres and increase their foaming ratio and foaming rate. Background technique [0002] Polymer foamable microspheres can be used in inks, explosives and paper, and can be used as fillers in rubber, plastics and coatings to reduce the weight of materials, and improve material elasticity, sound insulation and thermal insulation. [0003] Polymer foamable microspheres are usually prepared by suspension polymerization, usually by suspending a mixture containing a polymerizable monomer and a volatile blowing agent in an aqueous dispersion medium. As the polymerization reaction progresses, the resulting polymer A...

Claims

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Application Information

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IPC IPC(8): C08J9/32C08J9/20C08F220/44C08F220/42C08F214/08C08L33/20C08L33/18C08L27/08
Inventor 王海涛钱林平杜强国徐新连
Owner FUDAN UNIV
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