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Preparation method of modified polyisoprene latex

A technology of polyisoprene and isoprene, which is applied in the field of rubber, can solve the problems of poor hydrophilicity, mold pollution, and high equipment requirements, and achieve the effects of easy dispersion, reduced dosage, and improved mechanical stability

Pending Publication Date: 2022-04-12
北京戍光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of direct emulsion polymerization of isoprene is generally not adopted because of its high gel content and uncontrollable structure, which cannot meet the requirements of high-performance isoprene latex.
[0004] However, due to the high molecular weight and poor hydrophilicity of polyisoprene latex, this method of emulsion emulsification requires a considerable amount of additional emulsifiers to assist emulsification. These emulsifiers tend to migrate and residue when preparing dipped products. pollution, and the preparation process has high requirements for equipment, and the mechanical stability of the emulsion is generally poor

Method used

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  • Preparation method of modified polyisoprene latex

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of modified polyisoprene latex proposed by the present invention comprises the following steps:

[0022] S1, Preparation of polyisoprene rubber solution

[0023] The polymerization kettle was replaced with high-purity nitrogen and cleaned with cyclohexane, and 2kg of isoprene, 22kg of cyclohexane, and 10ml of n-butyllithium solution (1.0M hexane solution) were respectively added to the polymerization kettle and stirred evenly to remove impurities. , raise the temperature of the feed liquid in the reaction kettle to 45°C, then add 2.5mL of n-butyl lithium solution (1.0M hexane solution) as an initiator into the polymerization kettle to initiate the polymerization reaction, and after 2 hours of reaction, raise the temperature to 60°C to continue the reaction 1h, then add ethanol equal to the mole of the initiator to terminate the reaction, finally add 75g of 20% anti-aging agent 264 hexane solution, stir for about 5 minutes to obtain polyisopr...

Embodiment 2

[0029] S1, Preparation of polyisoprene rubber solution

[0030] The polymerization kettle was replaced with high-purity nitrogen and cleaned with cyclohexane, and 2kg of isoprene, 22kg of cyclohexane, and 10ml of n-butyllithium solution (1.0M hexane solution) were respectively added to the polymerization kettle and stirred evenly to remove impurities. , raise the temperature of the feed liquid in the reaction kettle to 45°C, then add 3mL of n-butyl lithium solution (1.0M hexane solution) as an initiator into the polymerization kettle to initiate the polymerization reaction, after 2h of reaction, raise the temperature to 60°C and continue the reaction for 1h , and then add ethanol equimolar to the initiator to terminate the reaction, and finally add 75 g of 20% anti-aging agent 264 in hexane, and stir for about 5 minutes to obtain polyisoprene glue.

[0031] S2, polyisoprene graft modification

[0032] Add 16 kg of hexane to dilute the polyisoprene glue solution obtained in st...

Embodiment 3

[0036] (1) The preparation of polyisoprene rubber solution is the same as in Example 1

[0037] (2) Polyisoprene graft modification

[0038]Dilute the polyisoprene rubber solution obtained in step S1 by adding 16 kg of hexane, heat to 77° C., and stir for 20 minutes. Add 160g SR-10, 14.4g benzoyl peroxide and 2160g toluene into the dripping tank and stir for 20min, then drop the feed liquid in the dripping tank into the reactor to start the grafting reaction, the rate of addition is controlled The dropwise addition was completed in 5 hours, and then the temperature was raised to 82° C., and the reaction was continued for 5 hours to obtain a grafted modified polyisoprene glue solution.

[0039] (3) Polyisoprene glue emulsification

[0040] Transfer the modified polyisoprene glue to a high-speed emulsification kettle, add 50kg deionized water, 38g sodium dodecylbenzenesulfonate, 19g disproportionated potassium abietate, 8gspan-80, 50g potassium hydroxide, and then stir at a hi...

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Abstract

The invention provides a preparation method of modified polyisoprene latex, which comprises the following steps: S1, in the presence of an organic alkali metal catalyst and a first organic solvent, carrying out anionic polymerization on an isoprene monomer to obtain a polyisoprene glue solution; s2, grafting a reactive hydrophilic monomer to a polyisoprene molecular chain by using the polyisoprene glue solution obtained in the step S1 through a free radical initiator to obtain a modified polyisoprene glue solution; and S3, emulsifying the modified polyisoprene rubber solution obtained in the step S2, water and an external emulsifier in an emulsifying kettle, and carrying out solvent removal and centrifugal concentration treatment to obtain the finished product modified polyisoprene latex. The reactive hydrophilic monomer is introduced to endow polyisoprene with certain hydrophilicity and self-emulsifying function, so that the polyisoprene is more easily dispersed in a water phase, the dosage of an external emulsifier in the latex preparation process can be reduced, and the mechanical stability of the latex is improved.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a preparation method of modified polyisoprene latex. Background technique [0002] Polyisoprene latex is the closest to natural latex in synthetic latex. Since the synthetic polyisoprene latex does not contain any protein, it can replace natural latex to avoid the problem of human allergy caused by natural latex products, and is very suitable for the field of latex products that come into contact with the human body. [0003] At present, there are two main ways to prepare high-performance polyisoprene latex: 1. Use rare earth catalyst system to prepare polyisoprene glue, then emulsify and desolventize to prepare latex 2. Use lithium catalyst to prepare polyisoprene The glue solution is then emulsified and desolventized to prepare latex. The method of direct emulsion polymerization of isoprene is generally not adopted because of its high gel content and uncontrollable structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/07C08L51/00C08F279/02C08F220/28C08F2/60
Inventor 辛明泽李文元林洪凯贺留洋林金河
Owner 北京戍光科技有限公司