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Preparation method of carboxylic butadiene-acrylonitrile latex

A technology of carboxylated nitrile latex and emulsion, which is applied in the field of seed emulsion polymerization, can solve the problems of high conversion rate, time-consuming, poor stability, and many condensates, and achieve the goals of reduced condensate content, high stability, and balanced reaction rate Effect

Pending Publication Date: 2021-11-23
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in the above method is that it takes a long time to obtain a higher conversion rate
Although the monomer dropping time is short, it is difficult to control the temperature and pressure of the reaction process, which leads to poor stability and many condensates in the product.

Method used

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  • Preparation method of carboxylic butadiene-acrylonitrile latex
  • Preparation method of carboxylic butadiene-acrylonitrile latex
  • Preparation method of carboxylic butadiene-acrylonitrile latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of carboxyl nitrile latex comprises following components and parts by weight thereof:

[0027] A, seed emulsion comprise following components and parts by weight thereof:

[0028]

[0029] Preparation method of seed emulsion:

[0030] After the polymerization kettle is evacuated, add deionized water, sodium lauryl sulfate, sodium dodecylsulfonate, sodium p-styrenesulfonate, sodium persulfate, raise the temperature to 70°C, add styrene and acrylonitrile dropwise , acrylic acid, and n-dodecanethiol for free radical emulsion polymerization, the reaction time is 3 hours, the temperature is raised to 90° C. for 0.5 hour, cooled and filtered to obtain a seed emulsion.

[0031] B, carboxylated styrene-butadiene latex include following components and parts by weight thereof:

[0032]

[0033]

[0034] The preparation method of carboxylated nitrile latex:

[0035] After the polymerization tank is vacuumed, add deionized water, sodium alkyl diphenyl et...

Embodiment 2

[0037] The preparation of carboxyl nitrile latex comprises following components and parts by weight thereof:

[0038] A, seed emulsion comprise following components and parts by weight thereof:

[0039]

[0040] Preparation method of seed emulsion:

[0041] After the polymerization kettle is evacuated, add deionized water, sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, sodium p-styrenesulfonate, sodium acrylamidoisopropylsulfonate, ammonium persulfate, and heat up To 90°C, add dropwise a mixture solution of styrene, acrylonitrile, methacrylic acid, and tertiary dodecylmercaptan to carry out radical emulsion polymerization. The reaction time is 6 hours, and the temperature is raised to 90°C and kept for 0.5 hours. After cooling and filtering, Prepare seed emulsion.

[0042] B, carboxylated nitrile latex include following components and parts by weight thereof:

[0043]

[0044] The preparation method of carboxylated nitrile latex:

[0045] After the polymeri...

Embodiment 3

[0047] The preparation of carboxyl nitrile latex comprises following components and parts by weight thereof:

[0048] A, seed emulsion comprise following components and parts by weight thereof:

[0049]

[0050] Preparation method of seed emulsion:

[0051] After the polymerization kettle is evacuated, add deionized water, sodium dodecylbenzenesulfonate, sodium hexadecylacrylate-2-ethanesulfonate, potassium persulfate, raise the temperature to 80°C, add styrene and acrylonitrile dropwise , methacrylic acid, n-butanthiol mixture solution for free radical emulsion polymerization, the reaction time is 4 hours, the temperature is raised to 90 ° C for 0.5 hours, cooled and filtered to obtain the seed emulsion.

[0052] B, carboxylated nitrile latex include following components and parts by weight thereof:

[0053]

[0054]

[0055] The preparation method of carboxylated nitrile latex:

[0056] After the polymerization kettle is vacuumed, add deionized water, sodium dode...

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Abstract

The invention belongs to the technical field of emulsion polymerization, and relates to a preparation method of carboxylic butadiene-acrylonitrile latex. A seed emulsion polymerization technology is adopted, and the preparation method comprises the steps of vacuumizing a polymerization kettle, adding deionized water, an emulsifier 1, an emulsifier 2, a seed emulsion and an initiator, carrying out gradient heating at the temperature of 25-60 DEG C, starting to dropwise add a mixture solution of acrylonitrile, butadiene, a carboxylic acid monomer and a molecular weight regulator for free radical emulsion polymerization for 6-9 hours, heating to 75 DEG C, keeping the temperature for 2 hours, cooling, adjusting the pH value of a reaction product to 6-8 by using an alkaline substance, and filtering to obtain carboxylic butadiene-acrylonitrile latex. Compared with the prior art, the carboxylic butadiene-acrylonitrile latex provided by the invention has excellent stability. The carboxylic butadiene-acrylonitrile latex is good in flowability, and is suitable for dipping gloves, medical examination gloves, thin (unlined) gloves and the like. The gradient heating process is adopted, the reaction condition is mild, the monomer is dropwise added, the temperature runaway phenomenon and the condensation product generation are effectively controlled, and the process is easy to control.

Description

technical field [0001] The invention relates to the technical field of seed emulsion polymerization, in particular to a preparation method of carboxylated nitrile latex. Background technique [0002] Carboxylated nitrile latex is mainly an aqueous dispersion prepared by emulsion polymerization of acrylonitrile, butadiene and a third monomer containing carboxylic acid such as acrylic acid and methacrylic acid. It has excellent oil resistance, solvent resistance, heat resistance, chemical corrosion resistance, wear resistance, etc. After appropriate modification, it is widely used in thick, thin, lined, unlined gloves and sealing materials, etc. field. [0003] Chinese Patent No. CN 105237682 discloses a production process of carboxylated nitrile latex. It adopts styrene-butadiene latex as the seed, butadiene is all added to the reaction kettle, and another part of the monomer is added dropwise to obtain the carboxylated nitrile latex. A problem in the above method is that i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08F212/08C08F220/46C08F220/14C08F220/06C08F220/18
CPCC08F236/12C08F212/08C08F220/46C08F220/14C08F220/06C08F220/1804C08F220/1802
Inventor 施晓旦张芳芳尹东华
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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