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Preparation method of high-performance carboxylic butadiene-acrylonitrile latex

A high-performance technology of carboxylated nitrile latex, which is applied in the field of preparation of high-performance carboxylated nitrile latex, can solve the problems of poor processability, slow film-forming speed and complicated process of carboxylated nitrile latex, and achieve good performance.

Pending Publication Date: 2021-10-29
江西岳峰集团环保新材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, carboxylated nitrile latex has slow film-forming speed and poor processability
Synthetic carboxylated nitrile latex of the prior art generally adopts thermal method-batch emulsion polymerization, but this method technique is comparatively complicated, and reaction temperature fluctuates greatly, is difficult to control
And another kind of synthetic method cold method-continuous emulsion polymerization of carboxylated nitrile latex, although reaction temperature is low, easy to control, but the polymerization time is long, the reaction cycle is long and the latex performance of making is slightly poor

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A high-performance carboxylated nitrile latex:

[0034] S1. In terms of parts by mass, add 70 parts of desalted water, 72 parts of butadiene, 26 parts of acrylonitrile, 2 parts of methacrylic acid, and 8 parts of composite emulsifier (sodium alkylbenzene sulfonate and fatty alcohol) into the polymerization kettle. Polyoxyethylene ether (mass ratio 11:4) and 2.0 parts of tertiary dodecyl mercaptan were stirred evenly.

[0035] S2. The polymerization kettle was evacuated and replaced with nitrogen, 1.8 parts of initiator was added thereto, the temperature was adjusted to 9° C. (stirring speed was 120 r / min), and the polymerization reaction was continued for 7 hours.

[0036] S3. Add 0.011 and 0.008 molecular weight regulators respectively when the polymerization conversion rate reaches 25% and 35%, adjust the reaction temperature to 5° C. (stirring speed is 72 r / min), and carry out polymerization reaction for 1.5 hours after adding.

[0037] (Step S2 and Step S3 need to ...

Embodiment 2

[0040] A high-performance carboxylated nitrile latex:

[0041] S1. In terms of parts by mass, add 70 parts of desalted water, 70 parts of butadiene, 26 parts of acrylonitrile, 4 parts of acrylic acid, and 6 parts of composite emulsifier (sodium alkylbenzene sulfonate and fatty alcohol polyoxygen) into the polymerization kettle. Vinyl ether (mass ratio 9:4) and 1.5 parts of tertiary dodecyl mercaptan were stirred evenly.

[0042] S2. The polymerization kettle was evacuated and replaced with nitrogen, 1.5 parts of initiator was added thereto, the temperature was adjusted to 8° C. (stirring speed was 110 r / min), and the polymerization reaction was continued for 6 hours.

[0043] S3. Add 0.010 and 0.007 molecular weight modifiers respectively when the polymerization conversion rate reaches 25% and 35%, adjust the reaction temperature to 5° C. (stirring speed is 66 r / min), and carry out polymerization reaction for 1.2 hours after addition.

[0044] (Step S2 and Step S3 need to add...

Embodiment 3

[0047] A high-performance carboxylated nitrile latex:

[0048] S1. In terms of parts by mass, add 70 parts of desalted water, 75 parts of butadiene, 24 parts of acrylonitrile, 1 part of methacrylic acid, and 10 parts of composite emulsifier (sodium alkylbenzene sulfonate and fatty alcohol) into the polymerization kettle. Polyoxyethylene ether (mass ratio 13:4) and 2.5 parts of tertiary dodecyl mercaptan were stirred evenly.

[0049]S2. The polymerization kettle was evacuated and replaced with nitrogen, 2.2 parts of initiator was added thereto, the temperature was adjusted to 10° C. (stirring speed was 130 r / min), and the polymerization reaction was continued for 8 hours.

[0050] S3. Add 0.012 and 0.009 molecular weight modifiers respectively when the polymerization conversion rate reaches 25% and 35%, adjust the reaction temperature to 6° C. (stirring speed is 78 r / min), and carry out polymerization reaction for 2 hours after addition.

[0051] (12 parts of deionized water n...

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Abstract

The invention discloses a preparation method of high-performance carboxylic butadiene-acrylonitrile latex. The preparation method comprises the following steps: adding desalted water, a polymeric monomer, a compound emulsifier and a molecular weight regulator into a polymerization kettle, uniformly stirring, vacuumizing the polymerization kettle, replacing with nitrogen, then adding an initiator into the polymerization kettle, regulating the temperature to 8-10 DEG C, and continuously carrying out polymerization reaction, and when the polymerization conversion rate reaches 25% and 35%, respectively supplementing a molecular weight regulator once, adjusting the reaction temperature to 5-6 DEG C, continuing polymerization after supplementing, and when the polymerization conversion rate reaches 75-80%, adding a terminator to stop the reaction. The polymerization reaction process only lasts for about 10 hours and is easy to control, the time of the polymerization reaction process is basically close to that of a hot method-intermittent emulsion polymerization method, and the prepared carboxylic butadiene-acrylonitrile latex is good in performance and meets the use conditions of multiple fields.

Description

technical field [0001] The invention relates to the technical field of carboxylated nitrile latex, in particular to a preparation method of high-performance carboxylated nitrile latex. Background technique [0002] Nitrile latex is a variety developed in the mid-1960s in my country. Its application is becoming more and more extensive, the technology is continuously improved, and the varieties are increasingly serialized. Carboxylated nitrile latex developed on the basis of nitrile latex is a water dispersion system of butadiene, acrylonitrile and carboxylic acid copolymer. [0003] Carboxylated nitrile latex has carboxyl groups on its molecular chain, so its performance is better than that of ordinary nitrile latex, and it has the advantages of self-crosslinking. Performance and ozone aging resistance have been improved. The introduction of carboxyl groups can also increase the polarity of nitrile latex and increase its compatibility with polyvinyl chloride, phenolic resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08F220/46C08F220/06C08F4/38C08F2/26C08F2/30
CPCC08F236/12C08F220/46C08F220/06C08F4/38C08F2/26C08F2/30Y02T10/86
Inventor 田沃曾建波
Owner 江西岳峰集团环保新材有限公司