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Butyl latex and preparing method thereof

A butyl latex and latex technology, which is applied in the field of butyl latex preparation, can solve the problems of butyl latex products, such as the decline in mechanical properties, high shear rate, and long emulsification time

Inactive Publication Date: 2016-10-26
盘锦和运新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing research reports, the choice of emulsifier system lacks optimization. In order to achieve a certain emulsification effect, the emulsification time required is too long or the shear rate is too high, which directly leads to excessive loss of rubber molecular weight, which in turn makes the mechanical properties of butyl latex products Significant performance drop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Get concentration and be 9.0% cyclohexane to dissolve 1000 parts of glue solution of common butyl rubber, join in 500 parts of emulsifier aqueous solution, wherein emulsifier concentration is 2.5%, adjust the pH value of emulsifier aqueous solution with potassium hydroxide to be 10.0 . Use strong mechanical stirring to pre-mix for 20 minutes, then transfer to an emulsification tank, and use a shear to emulsify for 25 minutes at a line speed of 8.8m / s to obtain an O / W emulsion. Pump it into the evaporator for vacuum distillation to remove the hydrocarbon solvent, and use purge gas to defoam. The temperature of the emulsion was 70°C, the vacuum in the evaporator was 65 kPa, and the vacuum distillation was stopped after 70 minutes. The residual value of hydrocarbon solvent in the emulsion was determined to be 1860 ppm. It is then pumped into a vacuum membrane distillation device to further remove the hydrocarbon solvent, in which the feed liquid, that is, the emulsion, fl...

Embodiment 2

[0024] Get concentration and be 1000 parts of the glue solution of common butyl rubber dissolved in pentane of 18.0%, join in 1000 parts of emulsifier aqueous solution, wherein emulsifier concentration is 1.6%, the pH value of regulating emulsifier aqueous solution with potassium hydroxide is 11.0. It was pre-mixed by strong mechanical stirring for 20 min, then transferred to an emulsification tank, and emulsified by a shear for 15 min at a line speed of 7.5 m / s to obtain an O / W emulsion. Pump it into the evaporating kettle for vacuum distillation to remove the solvent, and use purge gas to defoam. The temperature of the emulsion was 45°C, the vacuum in the evaporator was 55 kPa, the vacuum distillation was stopped after 60 minutes, and the residual value of hydrocarbon solvent in the emulsion was determined to be 1020 ppm. It is then pumped into a vacuum membrane distillation device to further remove the hydrocarbon solvent, wherein the feed liquid, that is, the emulsion flow...

Embodiment 3

[0026] Get concentration and be 12.0% hexane and dissolve 1000 parts of glue solution of brominated butyl rubber, join in 800 parts of emulsifier aqueous solution, wherein emulsifier concentration is 1.8%, adjust the pH value of emulsifier aqueous solution with potassium hydroxide to be 12.0 . Use strong mechanical stirring to pre-mix for 15 minutes, then transfer to an emulsification tank, use a shearing machine to emulsify for 10 minutes, and the line speed is 10.0m / s to obtain an O / W emulsion. Pump it into the evaporating kettle for vacuum distillation to remove the solvent, and add 0.05% modified silicone oil for defoaming. Wherein the temperature of the emulsion is 55° C., the vacuum degree in the evaporator is 75 kPa, and the distillation under reduced pressure is stopped after 80 minutes, and the residual value of the hydrocarbon solvent in the emulsion is determined to be 90 ppm. It is then pumped into a vacuum membrane distillation device to further remove hydrocarbo...

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Abstract

The invention provides a butyl latex and a preparing method thereof. Specifically, in the preparing method of the butyl latex, the butyl latex is prepared with a dissolving-emulsifying method, and the preparing method comprises the following steps that butyl rubber or brominated butyl rubber is dissolved with a saturated alkane solvent, emulsification is carried out, the solvent is removed, concentration is carried out, and whey is recycled. In an emulsifying agent system, a main emulsifying agent is one or two of sodium dodecylbenzene sulfonate, disproportionated potassium rosinate and isomerized alcohol ether carboxylate, and an auxiliary emulsifying agent is one or two of Triton X-10 and Tween80. A stabilizing agent is one of EDTA and potassium laurate. The preparing method has the advantages that the dosages of the emulsifying agents are small, the latex yield is high, the molecular weight loss is low, and the whey is recycled. According to the butyl latex, the yield is 85% or above, the solid content is 50.0-70.0%, the content of the solvent is lower than 100 ppm, and the storage stability can reach six months. The butyl latex can be used for impregnation of cord threads and can also serve as primers of adhesives for textiles and the like, a film forming base material for paint, anti-corrosion or packaging coatings and medical sealant.

Description

technical field [0001] The invention relates to a butyl latex, in particular to a preparation method of the butyl latex with high latex yield, low solvent residue and high storage stability. Background technique [0002] Butyl rubber (including halogenated butyl rubber), as a main type of synthetic rubber, has the characteristics of heat resistance, ozone resistance, low temperature resistance and high air tightness, and is widely used in rubber hoses, medical rubber plugs, tire inner liners and Manufacture of adhesive products. Butyl latex retains the characteristics of butyl rubber, the processing technology is simpler, and it is easy to cooperate with other latex. The dipping and coating process can be used to prepare cord dipping, protective clothing, anti-corrosion coatings and packaging coatings, non-woven fabrics, anti-virus gloves, etc. Butyl latex, polyisoprene latex, and ethylene-propylene latex are collectively known as the three major artificial latexes, and ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/22C08L23/28C08J3/07
CPCC08L23/22C08J3/07C08J2323/22C08J2323/28C08L23/283C08L33/02C08L1/286
Inventor 陆军李建军张宏
Owner 盘锦和运新材料有限公司
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