Synthesis method and application method of low-medium temperature thermal expansion microspheres
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A technology of heat-expandable microspheres and expanded microspheres, applied in adhesive types, nitrile copolymer adhesives, coatings, etc., can solve problems such as large investment costs, high equipment requirements, and easy breakage of disabled parts. To achieve the effect of density reduction and volume increase
Active Publication Date: 2014-03-26
SHANGHAI GOLD LION CHEM CO LTD
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Although isobutane as a foaming agent can meet the current requirements of low-boiling foaming agents for expanded microspheres in the leather industry, isobutane as a foaming agent needs to be encapsulated into thermoplastic resins at lower temperatures or high pressures In the middle, the equipment requirements are relatively high, and the input cost is large
At the same time, since leather is co
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[0058] Example 1
[0059] Add 120g acrylonitrile, 24g methacrylonitrile, 24g methyl methacrylate, 72g ethyl acrylate, 0.4g trimethylolpropane trimethacrylate, 30g isopentane, 0.3g benzoyl peroxide, The oil phase of suspension polymerization is obtained.
[0060] Add 300g of deionized water, 10g of sodium chloride, 8g of sodium hydroxide, 14g of magnesium chloride hexahydrate in turn, stir and react for half an hour at room temperature, then add 3g of sodium lauryl sulfate solution (1% by mass) to obtain The aqueous phase of suspension polymerization.
[0061] After mixing the above-mentioned oil phase and water phase, use a homogeneous dispersant machine at 7000 rpm in an ice water bath to stir for 5 minutes to obtain a suspension solution. The suspension solution was injected into a 1.0 L autoclave, after replacing the air with nitrogen, the reactor was pressurized to an initial pressure of 0.3 MPa; then, the reaction was carried out at 60° C. for 20 hours. Then cool down, relea...
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[0063] Example 2-12 and Comparative Example 1-5
[0064] 1) Using the same synthesis method as in Example 1, the components and reaction temperature are shown in Tables 1-2
[0066] 2) Through the particle size distribution characteristics and foaming performance test experiments, the thermal expansion microspheres are compared and analyzed
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Abstract
The present invention discloses a synthesis method of low-medium temperature thermal expansion microspheres. The synthesis method comprises: adding a foaming agent to a water system dispersion medium containing a dispersion stabilizer, carrying out suspension polymerization on a monomer mixture adopting an acetonitrile monomer and an olefin monomer as main materials to prepare a shell of a thermoplastic copolymer with a low glass transition temperature, and encapsulating the foaming agent into the shell to obtain the surface-functionalized thermally-foamable expansion microspheres, wherein the initial particle size of the expansion microspheres is 6-11 mum, the initial foaming temperature is low than 110 DEG C, and the concentrated foaming temperature is 110-135 DEG C. According to the present invention, the low-medium temperature thermal expansion microspheres can be adopted as the filler or the foaming agent so as to be well combined with the base resin; and after being heated, the coated acrylic resin polymer shell is softened, the liquid state alkane compound in the internal becomes the gas so as to expand, and the volume is expanded to 30-40 times the original volume so as to effectively achieve effects of filling, part difference reduction and density reduction, such that the lightweight on the leather and the synthetic leather is particularly and easily achieved, and good effects are provided for leather filling and mending.
Description
technical field [0001] The present invention relates to a thermally expandable microsphere, specifically a method for synthesizing a medium-low temperature expandable microsphere with a surface modification group, and the use of the microsphere as a filling and foaming agent. Compositions, and methods of application in the leather industry and beyond. Background technique [0002] Heat-expandable microspheres are tiny spherical plastic particles composed of a polymer shell and the gas wrapped in it. When heated to a certain temperature, the thermoplastic shell softens, the gas inside the shell expands, and the volume of the microsphere is Dozens of times the increase. Heat-expandable microspheres having a thermoplastic resin outer shell and a foaming agent sealed inside are generally called heat-expandable microcapsules. As the thermoplastic resin, generally, vinylidene chloride-based copolymers, acrylonitrile-based copolymers, and acrylate-based copolymers can be used. A...
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