Low-pollution flame-retardant thermal expansion microspheres and preparation method thereof
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A heat-expandable microsphere, flame-retardant technology, applied in flame-retardant fibers, textiles and papermaking, fiber processing, etc., to achieve the effect of improving flame-retardant efficiency, low pollution, and high-efficiency flame-retardant effects
Active Publication Date: 2018-05-29
YANGZHOU UNIV
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Problems solved by technology
However, halogen-containing compounds have greater pollution, so it is urgent to develop flame-retardant thermally expandable microspheres with excellent flame retardancy and low pollution.
Method used
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Embodiment 1
[0056] Add 270g deionized water, 10g sodium hydroxide, 30g magnesium chloride hexahydrate, 1wt% sodium lauryl sulfate aqueous solution 4g and 35g sodium chloride in 500ml three-necked flask, at 1000r / min Stir vigorously under the same conditions for 30 minutes to obtain an aqueous phase protection solution.
[0057] The reaction is water phase polymerization, and the oil phase reaction liquid droplets can react in a spherical shape in the water phase, so that the shape of the foamed microspheres is circular.
[0058] Add 60g of acrylonitrile, 36g of methyl methacrylate, 24g of vinyl acetate, 20g of n-hexane, 16g of trioctyl phosphate, 3g of azobisisobutyronitrile, 0.48g of ethylene glycol diformic acid acrylate, and 3 g of benzene and 60 g of KH570 modified magnesium hydroxide micron particles were mixed uniformly to obtain an oil phase.
[0059] KH570 modified magnesium hydroxide micron particles: it is the surface modified hydroxide in the shell material components. It is ...
Embodiment 2
[0063] On the basis of Example 1, the raw materials of the oil phase were changed to: 60g of acrylonitrile, 36g of methyl methacrylate, 24g of vinyl acetate, 36g of tributyl phosphate, 3g of azobisisobutyronitrile, ethylene glycol di 0.48 g of formic acid acrylate, 2 g of ethylene glycol di(meth)acrylate, and 40 g of KH570 modified magnesium hydroxide nanoparticles were uniformly mixed to obtain an oil phase.
[0064] Other similar operations.
Embodiment 3
[0066] On the basis of Example 1, the oil phase raw materials were changed into: 60g of acrylonitrile, 36g of methyl methacrylate, 24g of vinyl acetate, 30g of pyrophosphate, 10g of isooctane, 3g of azobisisobutyronitrile, and 0.48 g of diol diformic acid acrylate, 6 g of di(ethylene glycol) di(meth)acrylate, and 60 g of KH560 modified magnesium hydroxide micron particles were uniformly mixed to obtain an oil phase.
[0067] Other similar operations.
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Abstract
The invention discloses low-pollution flame-retardant thermal expansion microspheres and a preparation method thereof, and relates to a preparation technology of a chemical product. The preparation method comprises the following steps: uniformly mixing deionized water, sodium hydroxide, magnesium chloride hexahydrate, an aqueous sodium dodecyl sulfate solution and sodium chloride to obtain a waterphase protection solution; uniformly mixing surface-modified hydroxide, an unsaturated olefinic monomer polymer, an oil-soluble flame retardant, an inert hydrocarbon and an initiator in the presenceof a dispersing agent and an auxiliary agent to obtain an oil phase; under a stirring condition, dropwise adding the oil phase into the water phase protection solution, performing a suspension polymerization reaction to obtain stable liquid drops, then raising the temperature, then performing a reaction under an anoxic condition to obtain a suspension, performing suction filtration on the suspension, and drying to obtain the flame-retardant thermal expansion microspheres. The low-pollution flame-retardant thermal expansion microspheres have the most important characteristics of a highly-effective flame-retardant effect, relatively low toxicity and relatively low pollution.
Description
technical field [0001] The invention relates to a chemical product, in particular to a production process of high-efficiency flame-retardant heat-expandable microspheres. Background technique [0002] Thermally expandable microspheres refer to particles with a core-shell structure formed by encapsulating inert hydrocarbons with a polymer shell. Because of its light weight and uniformity, uniform foaming ratio, and the foamed microspheres have the characteristics of sound insulation, heat insulation, shock absorption, and weight reduction, it is widely used in paint printing, foam industry, leather, automobile manufacturing and other industries. middle. [0003] In the prior art, thermally expandable microspheres used as flame retardants have been developed. The basic method is to replace the foaming agent of the heat-expandable microspheres with a fluorine-containing compound containing an ether structure, no chlorine and bromine in the molecular formula, and a carbon numb...
Claims
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