Thermoexpandable thermoplastic microspheres

A thermoplastic microsphere and thermal expansion technology, applied in the field of thermoplastic microspheres, can solve the problems of unsatisfactory performance, high price and complicated production process.

Active Publication Date: 2012-08-15
NANOSPHERE SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing higher T 开始 In the thermally expandable thermoplastic microspheres, methacrylonitrile becomes an essential component of the thermoplastic polymer (shell) (the production process of methacrylonitrile is complex and expensive), and under the condition of no methacrylonitrile, the prepared The properties of thermally expandable thermoplastic microspheres (mainly T 开始 and expansion capacity) are not yet satisfactory to users

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] By mixing 140 grams of acrylonitrile, 20 grams of N,N-dimethylacrylamide, 40 grams of methyl methacrylate, 0.1 grams of 2,2,2-trifluoroethyl methacrylate, 0.4 grams of trimethylol Propane trimethacrylate, 4 grams of benzoyl peroxide and 50 grams of isooctane resulted in a suspension polymerized oil phase.

[0051] Add 280 grams of deionized water, 30 grams of sodium hydroxide, 40 grams of sodium chloride and 0.2 grams of sodium lauryl sulfate into beaker No. 1 to fully dissolve; add 280 grams of deionized water, 85 grams of six Magnesium chloride hydrate, 30 grams of sodium chloride, and 0.01 grams of sodium nitrite are fully dissolved; the solution in the No. 1 beaker is first poured into a 2.5-liter three-necked flask with a stirring paddle, then stirred at 1200 rpm, and then poured into the three-necked flask Slowly add the solution in the No. 2 beaker to the flask. After the addition was complete, the mixture was fully stirred for 15 minutes to obtain a suspension-...

Embodiment 2

[0054] By mixing 40 g of acrylonitrile, 2 g of N,N-dimethylacrylamide, 3 g of methyl methacrylate, 4 g of methyl acrylate, 0.1 g of 2,2,2-trifluoroethyl methacrylate, 0.5 g of methacrylic acid, 0.1 g of acrylic acid, 0.4 g of trimethylolpropane trimethacrylate, 1 g of azobisisobutyronitrile, 12 g of isooctane and 3 g of isopentane yielded an oily phase for suspension polymerization.

[0055] In 200 parts by weight of ion-exchanged water, add 23 parts by weight of sodium chloride, 10 parts by weight (active ingredient amount: 20% by weight) of colloidal silicon dioxide, 0.1 parts by weight of polyvinylpyrrolidone and 0.01 parts by weight of sodium nitrite, then adjust the pH Adjust to 2.4, mix uniformly, and use it as an aqueous dispersion medium.

[0056] The oil phase and the water phase were dispersed by stirring at 6000 rpm for 3 minutes with a homomixer to prepare a suspension solution. Immediately inject the suspension solution into a 1-liter high-pressure reactor, repla...

Embodiment 3-6

[0058] Except changing the type and amount of monomers used, crosslinking agent, initiator and expandable substance and polymer temperature (see Table 1 for details), other conditions are the same as in Example 1 to prepare different heat-expandable microspheres, Its performance is shown in Table 2.

[0059] Table 1

[0060]

[0061] In Table 1, AN: acrylonitrile, MMA: methyl methacrylate, DMAA: N,N-dimethylacrylamide, AM: acrylamide, HMAA: N-methylolacrylamide, TFEMA: trimethacrylate Fluoroethyl ester, HFBA: Hexafluorobutyl acrylate, TMPDMA: Trimethylolpropane trimethacrylate, EGDMA: Ethylene glycol dimethacrylate, DEGDE: Diethylene glycol divinyl ether, BPO: Over Benzoyl oxide, AIBN: azobisisobutyronitrile, LPO: lauroyl peroxide, DCPD: dicyclohexyl peroxycarbonate, IO: isooctane, NH: n-hexane, IP: isopentane.

[0062] Table 2

[0063]

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Abstract

The invention relates to thermoexpandable thermoplastic microspheres which are mainly prepared by carrying out suspension polymerization on olefine polymerizable monomers and expandable substances. The thermoexpandable thermoplastic microspheres have a core-shell structure which uses the thermoplastic polymers as the shell and the expandable substances as the cure. The invention is characterized in that on the basis of 100 wt% as the total weight of the olefine polymerizable monomers, the olefine polymerizable monomers are composed of 30-90 wt% of acrylonitrile, 5-50 wt% of methacrylate monomers, 1-20 wt% of acrylamide monomers, 0.01-1.0 wt% of fluorine-containing acrylate monomers and 0-40 wt% of acrylic monomers. The start T of the thermoexpandable thermoplastic microspheres is 160-200 DEG C.

Description

technical field [0001] The invention relates to a thermally expandable thermoplastic microsphere. Background technique [0002] Thermally expandable thermoplastic microspheres are microspheres with a core-shell structure mainly composed of thermoplastic polymers as the shell and expandable substances as the core. In such microspheres, the expandable substance is generally a liquid with a boiling point no higher than the softening temperature of the thermoplastic polymer (shell). When heated, the liquid evaporates to increase the internal pressure, and at the same time, the thermoplastic polymer (shell) softens, causing the microspheres to expand (the temperature at which the microspheres begin to expand is abbreviated as T 开始 , and the temperature at which the maximum expansion is achieved is abbreviated as T 最大 ). [0003] In some application fields, users want heat-expandable thermoplastic microspheres provided by suppliers to have a higher T 开始 (Generally at 160°C-200...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/48C08F220/18C08F220/56C08F220/22C08F220/06C08F2/20C08K5/01C08J9/20C08J3/12
Inventor 孙伟贤刘峰陈宝生
Owner NANOSPHERE SHANGHAI
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