Low-temperature heat-expandable microspheres, preparation method and application thereof

A heat-expandable microsphere, unsaturated technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problem of insufficient inhibition of heat-expandable microcapsule agglomeration, achieve high expansion performance, improve dispersibility, and solve the effect of cohesion

Active Publication Date: 2020-11-10
NANOSPHERE SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the ratio of the water-soluble monomer to the polymerizable monomer increases, the aggregation of the heat-expandable microcapsules during drying cannot be sufficiently suppressed only by the salting-out effect of the added sodium chloride.

Method used

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  • Low-temperature heat-expandable microspheres, preparation method and application thereof
  • Low-temperature heat-expandable microspheres, preparation method and application thereof
  • Low-temperature heat-expandable microspheres, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] By mixing 70g acrylonitrile, 40g methyl acrylate, 20g methyl methacrylate, 5.0g polyethylene glycol methyl ether methacrylate, 3.5g azobisisobutyronitrile, 0.7g tris(ethylene glycol) bis( Meth)acrylate and 40 g of isopentane give a suspension polymerized oil phase.

[0052] Add 250g of deionized water, 20g of sodium hydroxide, 10g of calcium chloride and 0.15g of sodium lauryl sulfate into the No. 1 beaker to fully dissolve; add 250g of deionized water, 5g of calcium chloride, and 5g of sulfuric acid into the No. 2 flask Magnesium, 0.01g of sodium nitrite is fully dissolved; first pour the solution in the No. 1 beaker into a 2L three-necked flask with a stirring paddle, then stir at a speed of 1000rpm, and then slowly add it into the No. 2 flask The solution. After the addition was complete, the mixture was fully stirred for 10 minutes to obtain a suspension-polymerized aqueous phase.

[0053] A suspension solution was prepared by dispersing the oil phase and the wate...

Embodiment 2-10

[0055] See Table 1, except that the type and amount of monomers, initiators, crosslinking agents and blowing agents used were changed, the polymerization temperature was 73°C, and the polymerization time was 20 hours. Other conditions were the same as in Example 1, and the obtained The properties of heat-expandable microspheres are shown in Table 3.

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Abstract

The invention discloses a preparation method of low-temperature thermal expansion microsphere and application thereof. The low-temperature thermal expansion microsphere comprises a shell and an expandable material wrapped in the shell, wherein the shell made from ethylenically unsaturated monomer and metal salt obtain a polymer obtained by polymerization reaction. The thermal expansion microsphereprovided by the invention does not contain halogen monomers in the shell, has lower Tstart, and can be used in industries such as paper making, automobile chassis, coating and the like. The acrylatemonomer replaces the vinylidene chloride monomer in the prior art in the invention, does not contain halogen, is environment-friendly and non-toxic. The polyether-type unsaturated monomer is added toprovide a large amount of hydrophilic groups, the dispersibility of the microspheres in water is improved, lower Tstart and higher expansion performance are achieved. The thermal expansion microspherein the invention contains aqueous dispersion medium of the 2-8 metal salts, which can effectively solve the problem of dissolution of the water-soluble monomers, such as polyether-type unsaturated monomers, in the water phase , and further effectively resolve the condensation problem caused by the water-soluble monomers in the drying of the microspheres.

Description

technical field [0001] The invention relates to a heat-expandable microsphere, a preparation method and application thereof. Background technique [0002] Heat-expandable thermoplastic microspheres are microspheres with a core-shell structure mainly composed of thermoplastic polymers as shells and expandable substances as cores. In such microspheres, the expandable substance is generally a liquid alkane having a boiling point no higher than the softening temperature of the thermoplastic polymer shell. Under heating conditions, the expansion agent vaporizes, the internal pressure increases, and at the same time, the thermoplastic polymer (shell) softens, and the microspheres expand significantly. The temperature at which the microspheres begin to expand is called T start , the temperature at which the maximum expansion is reached is called T max . [0003] In some application fields, such as: papermaking, ink printing, etc., users hope that the thermally expandable micros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/44C08F220/14C08F2/18B01J13/14
CPCB01J13/14C08F2/18C08F283/065C08F220/44
Inventor 张晓婷高英曹君张恒頔胡志军刘峰
Owner NANOSPHERE SHANGHAI
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