Auxiliary dispersant and preparation method
A technology of auxiliary dispersing agent and solvent, applied in the field of auxiliary dispersing agent for polymer polymerization and its preparation, can solve the problem that the absorption capacity of plasticizer cannot reach the ideal, the characteristics of auxiliary dispersing agent cannot be fully exerted, and the effect of auxiliary dispersing agent cannot be fully exerted. and other problems, to achieve the effect of shortening the plasticizing time, excellent processing performance, and reducing the number of fish eyes
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Embodiment 1
[0024] A kind of preparation method of assistant dispersant, carry out as follows:
[0025] 1. Preparation and verification of modified polyvinyl alcohol: 12 parts of allyl polyoxyethylene ether with an average addition mole number of 10 ethylene oxide and 100 parts of vinyl acetate in the presence of 2.1 parts of AIBN, in 150 parts of methanol Carry out copolymerization in a solvent, the polymerization temperature is 60°C, when the polymerization reaction is over, switch and blow out the residual single to obtain the comonomer, take a part of the comonomer and adjust it into a methanol solution with a concentration of 40wt%, and the concentration in use is 40g / L Alcoholysis of sodium hydroxide methanol solution to obtain modified polyvinyl alcohol containing oxyalkylene groups in the molecular chain.
[0026] In order to analyze and confirm the structural formula of the obtained modified polyvinyl alcohol, we have carried out the following detection to the polymer synthesized...
Embodiment 2
[0073] The assistant dispersant that embodiment 1 is made is used in polymerization reaction:
[0074] Usually, the water-based auxiliary dispersant of the present invention and other dispersion stabilizers are added into water to disperse the vinyl monomers in it, and carry out polymerization in the presence of an oil-soluble initiator. Such other dispersion stabilizers include methylcellulose, hydroxypropylcellulose, derivatives of hydroxypropylmethylcellulose and cellulose, gelatin or water-soluble polymers such as polyvinyl alcohol and polyvinylpyrrolidone, among which Polyvinyl alcohol with an alcoholysis degree of 68-88mol% and a polymerization degree of 500-2500 is most suitable for use. As for the type of dispersant, the weight ratio range of the added amount of the dispersion stabilizer and the auxiliary dispersant aqueous solution should be 95 / 5-20 / 80, preferably 80 / 20-30 / 60. The aqueous solution of the auxiliary dispersant can be added once at the initial stage of ...
Embodiment 3-9
[0100] Embodiment 3-9, comparative example 1-4
[0101] Using the relevant parameters described in Tables 1 and 2 below and in combination with the conventional production process, according to the preparation methods of Examples 1 and 2, the auxiliary dispersant and the polyvinyl chloride particle product were prepared, see Table 1 and Table 2 for details.
[0102] Table 1
[0103]
[0104] Note: A in the table 3 ~A 9 : Specifically: A 3 : Acryl polyether (APEG)-500, A 4 : APEG-600, A 5 .: APEG-300, A 6 : Polyoxyethylene (methyl) allyl ether, A 7 : Isobutylene polyoxyethylene ether, A 8 : Polyoxypropylene allyl ether, A 9 : polyoxypropylene (meth)propenyl ether; --: no modified monomer added; A: dodecyl mercaptan; B: SMAS; C: itaconic acid.
[0105] Table 2
[0106]
[0107] In addition to the above-mentioned eight modified polyvinyl alcohols used in the auxiliary dispersant of the present invention, for polyvinyl alcohols of other structures in the general st...
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