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

Active Publication Date: 2014-05-14
CHINA PETROCHEMICAL CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, since polyvinyl alcohol with a degree of alcoholysis of less than 60mol% is insoluble in water, (A) powdery material is used during suspension polymerization, or (B) is dissolved into water / alcohol or water / ketone After using the solution of the system, the method (A) has poor operability when adding materials, and the effect as a co-dispersing agent cannot be fully exerted, while the method (B) will cause problems such as alcohol solvent pollution to the environment.
In order to solve this kind of problem, there has been an aqueous solution of a dispersoid of a vinyl compound with amine groups, amino groups, carboxyl groups, sulfonic acid groups, etc. on the molecular chain and VAC as a dispersant, as an auxiliary dispersant. However, when using this ion-modified polyvinyl alcohol as an auxiliary dispersant, the pH value of the system should be adjusted between 3 and 3 according to the amount of buffer used in the polymerization, the input time of the buffer, the oxygen concentration of the polymerization system, etc. 8, the characteristics of the auxiliary dispersant cannot be fully utilized, and there are still problems such as poor polymerization stability, adhesion and fouling during the polymerization preparation process; the porosity of the prepared vinyl polymer is not high, and the pore distribution is not uniform , its de-monomerization and plasticizer absorption capacity cannot be ideal when processing with plasticizer

Method used

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  • Auxiliary dispersant and preparation method
  • Auxiliary dispersant and preparation method
  • Auxiliary dispersant and preparation method

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to an auxiliary dispersant, which is an aqueous solution of polyvinyl alcohol possessing a following structural formula: (img file='dest_path_image001.TIF' wi='399' he='125' / ), wherein m, n, x, y and p are integers, n is less than 135 and greater than 30, m is less than 165 and greater than 20, m / m+n is 40mol%-55mol%, x is greater than or equal to 1 or less than 20, y is less than 20 and greater than 1, p is greater than or equal to 0 or less than 5; R is hydrogen atom or methyl, R1, R2, R3 are hydrogen or alkyl. The auxiliary dispersant is used in a suspension polymerisation reaction of vinyl, and has strong dispersing capability and good dispersing stability to the monomer droplets, the influence of polymerization condition of vinyl compounds can not generated; the prepared vinyl polymer has the advantages of uniform porosity distribution and high porosity amount, and has good removal performance to the residual monomer from the reaction, a plasticizer with excellent absorption capability is added during a subsequent processing process, The processing property is excellent, the plasticizing time can be shortened, and fish eye number is reduced.

Description

technical field [0001] The invention relates to a dispersant aid for polymer polymerization and a preparation method thereof, belonging to the application field of polymer chemistry. Background technique [0002] For a long time, polyvinyl alcohol with a degree of alcoholysis lower than 60 mol% has been widely used as an auxiliary dispersant for suspension polymerization of vinyl compounds (especially vinyl chloride). However, since polyvinyl alcohol with a degree of alcoholysis of less than 60mol% is insoluble in water, (A) powdery material is used during suspension polymerization, or (B) is dissolved into water / alcohol or water / ketone The solution of system is used again later, with (A) method, operability is bad when feeding, and the effect as co-dispersing agent can not be brought into full play, and with (B) method, problems such as the pollution of alcohol solvent to environment can be produced. In order to solve this kind of problem, there has been an aqueous solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/20C08F283/06C08F218/08C08F216/20C08F8/00
Inventor 胡腊梅吕惠霞吴永忠廖永康黎园李永江雷德松郭永松张安清
Owner CHINA PETROCHEMICAL CORP
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