A kind of expandable PMMA powder and preparation method thereof
A powder and system technology, applied in the field of foamable polymer preparation, can solve the problems of affecting the appearance and use, low degree of controllability of bubbles, etc., and achieve the effect of high degree of controllability
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[0020] The preparation method of foamable PMMA powder of the present invention includes the following steps:
[0021] 1) Dissolve:
[0022] 1a) At 40-60℃, dissolve 2-6 parts of ethylene-vinyl acetate copolymer in 90 parts of refined acrylic monomers (refined methyl methacrylate, ethyl methacrylate, methacrylic acid) One or a mixture of butyl ester, methyl acrylate, ethyl acrylate or butyl acrylate), cool to room temperature to obtain A solution; add 0.5-3 parts of azo compounds (as azobisisobutyronitrile, One or a mixture of two kinds of azobisisoheptanoyl nitrile) and 0.1-0.5 parts of organic peroxy initiator (for one or two mixtures of dibenzoyl peroxide or dilauroyl peroxide) Dissolve in solution A to obtain solution B; add 0.1-0.5 parts of organic tertiary amine compounds (for N,N-dimethylaniline, N,N-dihydroxyethyl-p-toluidine or N,N-dihydroxypropyl) A mixture of one or more of methyl-p-toluidine) is dissolved in 10 parts of refined acrylate monomers to obtain a C solution. ...
Embodiment 1
[0028] 1) Dissolve:
[0029] 1a) At 60℃, dissolve 4 parts of ethylene-vinyl acetate copolymer in 90 parts of refined methyl methacrylate and cool to room temperature to obtain A solution; 3 parts of azobisisobutyronitrile and 0.3 parts of peroxide Dissolve dibenzoyl in solution A to obtain solution B; dissolve 0.3 parts of N,N-dihydroxyethyl p-toluidine in 10 parts of refined methyl methacrylate to obtain solution C;
[0030] 1b) Dissolve 2 parts of polyvinyl alcohol in 200 parts of water at 60°C and cool to room temperature to obtain D solution; dissolve and disperse 0.3 parts of sodium dodecylbenzene sulfonate in D solution to obtain E solution.
[0031] 2) Micro-suspension: Under the action of strong mechanical stirring, the B solution is dispersed and suspended in the E solution to form a micro-suspension system F with droplets in the range of 1.0 μm.
[0032] 3) Low-temperature micro-suspension polymerization: First, add 1 / 2 of the C solution to the micro-suspension system F at 4...
Embodiment 2
[0034] 1) Dissolve:
[0035] 1a) At 40°C, dissolve 6 parts of ethylene-vinyl acetate copolymer in 90 parts of refined ethyl methacrylate, and cool to room temperature to obtain A solution; add 0.5 part of azobisisoheptonitrile and 0.1 part of peroxide Dilauroyl is dissolved in solution A to obtain solution B; 0.1 part of N,N-dimethylaniline and N,N-dihydroxyethyl p-toluidine are dissolved in 10 parts of refined ethyl methacrylate to obtain C Solution
[0036] 1b) Dissolve 3 parts of polyvinyl alcohol in 300 parts of water at 40°C and cool to room temperature to obtain D solution; dissolve and disperse 0.2 parts of sodium dodecylbenzene sulfonate in D solution to obtain E solution.
[0037] 2) Micro-suspension: Under the action of strong mechanical stirring, the B solution is dispersed and suspended in the E solution to form a micro-suspension system F with droplets in the range of 1.5 μm.
[0038] 3) Low-temperature micro-suspension polymerization: first, add 1 / 2 of the C solution to...
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