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A kind of heat-expandable microsphere and preparation method thereof

A technology of heat-expandable microspheres and microspheres, which is applied in the field of foaming materials, can solve the problems of high expansion rate high-temperature foam stabilization performance, no effective solution, and the difficulty of heat-resistant high-temperature thermal expansion microspheres, etc., to improve the use of Comfortable, good foaming effect, guaranteed homogeneity effect

Active Publication Date: 2022-05-10
汕头市夏娃之秀内衣有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foaming ability of thermally expandable microspheres is affected by many factors such as the composition of the foaming agent, the composition of the shell wall polymer, the ratio of the foaming agent to the shell wall polymer, the size and distribution of the microspheres, and so on. The regulation is more complex
Moreover, it is often difficult to balance the high expansion ratio and excellent high-temperature foam stabilization performance, so it is difficult to prepare heat-resistant high-temperature thermal expansion microspheres.
[0005] In view of the above problems, there is no very effective solution at present, so it is necessary to further develop thermally expandable microsphere materials and their preparation processes

Method used

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  • A kind of heat-expandable microsphere and preparation method thereof
  • A kind of heat-expandable microsphere and preparation method thereof
  • A kind of heat-expandable microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 2

[0052] Add 89.5g of water and 1.5g of gelatin to the reaction bottle, stir evenly and heat it up to 80°C, then add a mixed solution containing 9g of methyl methacrylate and 0.03g of benzoyl peroxide dropwise to the gelatin The polymerization reaction is carried out in the aqueous solution, and the drip rate is controlled by a peristaltic pump, and the dripping is uniformly added in about 3 hours.

[0053] During the dropping process, the polymerized PMMA precipitates out of the system, and is suspended in the system due to the stirring and dispersing agent. After all the reactions are completed, the required ultra-high molecular weight PMMA-2 is obtained by filtration. The molecular weight Mw is 304193, and its GPC spectrum See attached figure 2 .

Synthetic example 3

[0055] Add 90g of water and 1g of gelatin to the reaction bottle, stir evenly and heat it up to 75°C, then add the mixed solution containing 9g of methyl methacrylate and 0.02g of benzoyl peroxide dropwise to the gelatin aqueous solution Carry out the polymerization reaction in the middle, use the peristaltic pump to control the dropping rate, and drop evenly for about 3 hours.

[0056] During the dropping process, the polymerized PMMA precipitated from the system, and was suspended in the system due to the stirring and dispersing agent. After all the reactions were completed, the required ultra-high molecular weight PMMA-3 was obtained by filtration. The molecular weight Mw was 346492, and its GPC spectrum See attached image 3 .

Embodiment 1

[0058] 5g of PMMA-1 was dissolved in 10g of dichloromethane, 95g of acetic acid was added as a core material, 1g of polyvinyl alcohol was added as a dispersant, and 0.5g of sodium dodecylbenzenesulfonate was added as an emulsifier;

[0059] After stirring evenly, add 400g of water, control the solution temperature to maintain between 10-20°C and keep stirring for 2 hours to make the solution emulsify evenly;

[0060] After the emulsification was uniform, the emulsion was placed on a tray and dried at 35°C until the dichloromethane was completely removed to obtain an aqueous solution 1 of PMMA-coated organic acid microspheres. attached Figure 4 It is the microscopic observation figure of the microsphere aqueous solution 1 of PMMA coating organic acid.

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Abstract

The invention discloses a heat-expandable microsphere and a preparation method thereof. The heat-expandable microsphere has a composite microsphere structure and includes an outer layer and an inner layer, wherein the outer layer is a polymer layer, and the inner layer is composed of several small microspheres and a solid A mixed layer of particles, the small microspheres include a shell material and a core material, and the solid particles react chemically with the core material to release gas. The present invention foams through chemical reaction, so that low-boiling alkane foaming agents common on the market are not used, and on the premise of not affecting the foaming effect, the problem of oil production of traditional foaming agents is solved. It is a kind of foaming agent with good performance , heat-expandable microspheres that can be used in daily necessities, which can be used in TPE foamed daily-use materials, and because of its oil-free characteristics, can be used to make materials for personal use. The present invention adopts a two-stage foaming method, and the final foaming structure is more stable.

Description

technical field [0001] The invention relates to the field of foaming materials, in particular to a heat-expandable microsphere and a preparation method thereof. Background technique [0002] Thermally expandable microspheres are mainly composed of polymer shells and heat-expandable core materials. When heated, their volume can expand dozens of times. This feature makes them important applications in light weight, patterning, and three-dimensional materials. value. [0003] In recent years, when heat-expandable microspheres are used in the foaming industry, compared with the original foaming agent, they have the advantage of uniform foaming. After high-temperature foaming, it will change from solid or liquid to gas, and volume expansion will occur. However, when the foaming process ends and enters the cooling process, the gaseous alkanes will return to solid or liquid. In the subsequent use, small molecular components will slowly penetrate When it reaches the surface of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/32C08F120/14
CPCC08J9/32C08F120/14
Inventor 柯伟强
Owner 汕头市夏娃之秀内衣有限公司
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