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A kind of method for preparing large particle size diene rubber latex

A diene rubber, large particle size technology, applied in the field of polymer preparation, can solve problems such as equipment corrosion, increase COD in wastewater treatment, and achieve the effect of less equipment corrosion

Active Publication Date: 2021-09-07
WANHUA CHEM (SICHUAN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of acidic raw materials, on the one hand, it caused equipment corrosion, and on the other hand, it increased the COD of wastewater treatment.
Based on known process methods, there is no report of agglomeration using inorganic bases

Method used

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  • A kind of method for preparing large particle size diene rubber latex
  • A kind of method for preparing large particle size diene rubber latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Polymerization: Take 95 parts of butadiene, 5 parts of styrene, 1.3 parts of potassium oleate, 1.1 parts of potassium abietate,

[0037] 2.4 parts of 1,18-octadec-9-ene-dioic acid monopotassium salt, 0.45 parts of tert-dodecyl mercaptan, 0.3 parts of potassium persulfate, 0.36 parts of potassium bicarbonate, 0.24 parts of sodium pyrophosphate, deionized 145 parts of water was added into the reactor, the initial pH was about 10.5, and the polymerization reaction was carried out at 67°C. The reaction time was 11 hours, the conversion rate was 97%, and the polymerization reaction was completed. Small particle size latex particle size 100nm.

[0038] 2) Agglomeration: adding KOH solution to the above polybutadiene latex to pH 12.5, and stirring to obtain latex with large particle size.

[0039] 3) Products:

[0040] Particle size: 300nm.

Embodiment 2

[0042]1) Polymerization: Take 95 parts of butadiene, 5 parts of isoprene, 0.62 parts of potassium oleate, 0.72 parts of potassium abietate, 0.1 part of sodium lauryl sulfate, and monopotassium 1,18-octadecanedioate Add 0.36 parts of salt, 0.25 parts of tert-dodecyl mercaptan, 0.6 parts of potassium persulfate, 0.6 parts of potassium bicarbonate, 0.25 parts of potassium sulfate, 0.4 parts of potassium carbonate, and 90 parts of deionized water into the reaction kettle, and the initial pH About 11, the polymerization reaction was carried out at 65°C. The reaction time was 15 hours, the conversion rate was 91%, and the polymerization reaction was completed. Small particle size latex particle size 150nm.

[0043] 2) Agglomeration: adding KOH solution to the above polybutadiene latex until the pH is 14, stirring to obtain latex with large particle size.

[0044] 3) Products:

[0045] Particle size: 500nm.

Embodiment 3

[0047] 1) Polymerization: Take 95 parts of butadiene, 5 parts of styrene, 0.3 parts of potassium oleate, 0.6 parts of potassium abietate, 8.1 parts of monopotassium 1,12-dodecanedioic acid, tert-dodecyl mercaptan 0.3 parts, 0.3 parts of potassium persulfate, and 140 parts of deionized water were added into the reaction kettle, the initial pH was about 9, and the polymerization reaction was carried out at 67°C. The reaction time was 8 hours, and when the conversion rate was 96%, the polymerization reaction was completed. Small particle size latex particle size 70nm.

[0048] 2) Agglomeration: adding KOH solution to the above polybutadiene latex to pH 11.6, stirring to obtain latex with large particle size.

[0049] 3) Products:

[0050] Particle size: 200nm.

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Abstract

The invention relates to a method for preparing large-diameter diene rubber latex. In the first step, in the presence of initiator, emulsifier, chain transfer agent, deionized water and optional electrolyte, the monomer is emulsion polymerized under the condition of pH 9-11.6 to obtain a small particle size latex, wherein the emulsifier is an anionic emulsifier agent, and the emulsifier contains 20‑90% C12‑C18 dibasic acid monosodium or monopotassium salt. In the second step, the pH of the latex with small particle size is increased to 11.6-14, so that the dibasic acid monosodium salt or monopotassium salt becomes disodium salt or dipotassium salt, and the small particle size latex is agglomerated to obtain a large particle size diameter latex. This method has the advantages of simple operation, reduction of COD in wastewater treatment, and reduction of equipment corrosion.

Description

technical field [0001] The invention belongs to the field of polymer preparation, in particular to a method for preparing large-diameter diene rubber latex. Background technique [0002] ABS resin is a ternary graft copolymer grafted from styrene and acrylonitrile to polybutadiene latex with large particle size (particle size is 250-350nm). Large particle size polybutadiene latex is the core component and skeleton of ABS resin, which endows ABS resin with toughness and directly affects the performance of ABS resin. There are two methods for synthesizing large particle size polybutadiene latex: one-step method and two-step method (agglomeration method). [0003] The one-step synthesis of polybutadiene latex with a particle size of 300nm usually has a longer reaction time, and the particle size growth rate is about 5-10nm / h. As described in CN200910237011.0, the large-particle polybutadiene latex particles produced by the one-step The average diameter is 250-350nm, and the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F212/08C08F222/02
CPCC08F236/10C08F212/08C08F222/02
Inventor 孙双翼韩强乔义涛
Owner WANHUA CHEM (SICHUAN) CO LTD
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