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Modified polyvinyl alcohol, preparation method and use thereof

A polyvinyl alcohol and modification technology, applied in the field of polymer chemistry, can solve the problems that the absorption capacity of the plasticizer cannot reach the ideal, the characteristics of the auxiliary dispersant cannot be fully exerted, and the effect of the auxiliary dispersant cannot be fully exerted. effect of reducing the number of fish eyes, excellent processing performance

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

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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  • Modified polyvinyl alcohol, preparation method and use thereof
  • Modified polyvinyl alcohol, preparation method and use thereof
  • Modified polyvinyl alcohol, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Copolymerize 12 parts of allyl polyoxyethylene ether with an average added mole number of ethylene oxide of 10 and 100 parts of vinyl acetate in 150 parts of methanol solvent in the presence of 2.1 parts of AIBN. The polymerization temperature is 60°C. When the polymerization reaction is over, switch to 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 carry out alcoholysis with a sodium hydroxide methanol solution with a concentration of 40g / L to obtain the molecule Modified polyvinyl alcohol containing oxyalkylene groups in the chain.

[0025] 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 in Example 1:

[0026] 1. Infrared qualitative analysis

[0027] Firstly, after air-drying the film of the obtained product, the TENSOR TMSeries FT-IR (l...

Embodiment 2

[0073] The modified polyvinyl alcohol of the present invention is made into the use of aqueous solution assistant dispersant:

[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 add...

Embodiment 3-9

[0100] Embodiment 3-9, comparative example 1-4

[0101] Using the relevant parameters described in the following tables 1 and 2 and in combination with the conventional production process, according to the preparation method of Examples 1 and 2, the aqueous solution of polyvinyl alcohol auxiliary dispersant and the polyvinyl chloride particle product are prepared, as shown in Table 1. ,Table 2.

[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 eight modified polyvinyl alcohols, for polyvinyl alcohols of other structures in the general structural formula of the modi...

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Abstract

The invention relates to modified polyvinyl alcohol, which has the following structure formula, wherein m, n, x, y, p are integers, n is more than 30 and is less than 135, m is more than 20 and is less than 165, m / (m+n) is 40-55 mol%, x is more than or equal to 1 and is less than 20, y is more than 1 and is less than 20, P is more than or equal to 0 and is less than 5, R is hydrogen atom or methyl, and R1, R2 and R3 are hydrogen or alkyl. According to the present invention, after the modified polyvinyl alcohol is used for vinyl polymer suspension polymerization reactions, the strong dispersion capability on monomer drops is provided, the dispersion stability is good, and influence of the vinyl polymer polymerization condition does not exist; and the prepared vinyl polymer has characteristics of high porosity distribution uniformity, high porosity and good removal of remaining monomers of the reaction, and the plasticizer added during the subsequent processing process has characteristics of excellent absorption ability, excellent processability, shortened plasticizing time and reduced number of the fish-eyes.

Description

technical field [0001] The invention relates to a modified polyvinyl alcohol and its preparation method and application, belonging to the 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 solution of a dispersoid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F218/08C08F216/20C08F8/00C08F2/20
Inventor 吕惠霞胡腊梅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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