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Concentration method of polyisoprene latex

A technology of polyisoprene and isoprene, which is applied in the field of concentration of polyisoprene latex and can solve problems such as poor latex stability

Active Publication Date: 2021-09-10
ZIBO LUHUA HONGJIN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of the flocculation effect of the paste method itself and the poor stability of latex, it is urgent to provide a method for concentrating polyisoprene latex

Method used

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  • Concentration method of polyisoprene latex
  • Concentration method of polyisoprene latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031](1) Add 2 kg of isoprene-modified sodium carboxymethyl cellulose to 1000 kg of dilute polyisoprene latex with a solid content of 8% and mix, leave to stand for stratification for 30 minutes, and obvious stratification boundaries occur, remove Part of the whey, to obtain concentrated polyisoprene latex; part of the whey still contains a small amount of tiny latex particles, using a two-dimensional layered Ti layer with a pore size of 80nm 3 C 2 The latex with higher concentration is then mixed with the concentrated polyisoprene latex for further processing, so as to realize the recycling of tiny latex particles.

[0032] The preparation of the isoprene-modified sodium carboxymethylcellulose is as follows: under the action of nitrogen and 1.5mol ammonium persulfate, take 50mol sodium carboxymethylcellulose as the main raw material, and 40mol isoprene as The modifier was reacted for 40 minutes, and the product was dried at 90° C. to obtain isoprene-modified sodium carboxym...

Embodiment 2

[0038] (1) Add 3 kg of isoprene-modified sodium carboxymethyl cellulose to 1000 kg of dilute polyisoprene latex with a solid content of 6% and mix, leave to stand for stratification for 20 minutes, and obvious stratification boundaries occur, remove Part of the whey, to obtain concentrated polyisoprene latex; part of the whey still contains a small amount of tiny latex particles, using a two-dimensional layered Ti layer with a pore size of 100nm 3 C 2 The latex with higher concentration is then mixed with the concentrated polyisoprene latex for further processing, so as to realize the recycling of tiny latex particles.

[0039] The preparation of the isoprene-modified sodium carboxymethyl cellulose is as follows: under the action of nitrogen and 5mol ammonium persulfate, take 100mol sodium carboxymethyl cellulose as the main raw material, and 60mol isoprene as the modified The reactant was reacted for 20 minutes, and the product was dried at 75° C. to obtain isoprene-modified...

Embodiment 3

[0045] (1) Add 1 kg of isoprene-modified sodium carboxymethyl cellulose to 1000 kg of dilute polyisoprene latex with a solid content of 7% and mix, leave to stand for stratification for 40 minutes, and obvious stratification boundaries occur, remove part of the whey to obtain concentrated polyisoprene latex; part of the whey still contains a small amount of tiny latex particles, and a two-dimensional layered Ti layer with a pore size of 150nm is used 3 C 2 The latex with higher concentration is then mixed with the concentrated polyisoprene latex for further processing, so as to realize the recycling of tiny latex particles.

[0046] The preparation of the isoprene-modified sodium carboxymethyl cellulose is as follows: under the action of nitrogen and 4mol ammonium persulfate, take 100mol sodium carboxymethyl cellulose as the main raw material, and 70mol isoprene as the modified The reactant was reacted for 30 minutes, and the product was dried at 60° C. to obtain isoprene-mod...

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Abstract

The invention belongs to the technical field of chemical rubber, and particularly relates to a concentration method of polyisoprene latex. The method comprises the following steps: adding a creaming agent into the diluted polyisoprene latex, mixing, standing for layering, and removing part of whey to obtain concentrated polyisoprene latex; and adjusting the pH value of the concentrated polyisoprene latex system, and adding an emulsifier into the concentrated polyisoprene latex for blending to obtain the concentrated polyisoprene latex. According to the invention, not only is the concentrated polyisoprene latex with high solid content obtained, but also the stability of the concentrated polyisoprene latex is ensured. The solid content of the concentrated polyisoprene latex ranges from 47% to 57%, the mechanical stability is larger than 1500 s, and the shelf life is larger than 6 months.

Description

technical field [0001] The invention belongs to the technical field of chemical rubber, in particular to a method for concentrating polyisoprene latex. Background technique [0002] Natural rubber latex products have high elasticity, low creep, high tensile strength, high elongation at break, good film-forming properties, etc., and occupy a dominant position in the field of latex products. Although the latex products prepared from natural latex have excellent performance, due to the small amount of protein contained in them, some people, especially those who are often in contact with natural latex products, are prone to allergic reactions or other adverse reactions, resulting in painful or uncomfortable symptoms. In order to solve the allergy problem caused by natural latex, and at the same time in order to solve the source and cost of natural latex, the development of synthetic latex to replace natural latex has become a very necessary way to produce latex products. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/075C08J3/02C08L9/10C08L71/02C08K5/41C08B11/20
CPCC08C1/075C08J3/02C08B11/20C08J2309/10C08J2471/02C08K5/41
Inventor 崔广军王锦昌李辉阳张文文王斌陈雷
Owner ZIBO LUHUA HONGJIN NEW MATERIAL CO LTD