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Silicane terminated polysulfide rubber and its preparing method

A polysulfide rubber and silane-capped technology, which is applied in the field of polysulfide rubber, can solve problems such as poor adhesion, inconvenient use and operation, and slow curing speed, and achieve the effects of enhanced application effect, convenient construction, and improved bonding effect

Inactive Publication Date: 2009-05-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the curing mechanism of the existing curing agent of polysulfide rubber, it can be seen that the sealant prepared from polysulfide rubber is usually temporarily mixed with the two components of polysulfide rubber main agent and curing agent in an appropriate amount before use. The ratio is mixed evenly, which brings inconvenience to its use and operation
Some systems cure too slowly, delaying the construction period
Moreover, polysulfide rubber sealant has poor adhesion to most non-porous materials such as metal, glass, plastic, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 300.0g (0.1mol, molecular weight 3000) of highly dehydrated liquid polysulfide rubber and 47.2g (0.2mol) of γ-glycidyl etheroxypropyltrimethoxysilane are added to a dry reactor, and Stir evenly, then add 0.35g of DMP-30, continue to stir, the system undergoes an exothermic reaction, and the temperature rises rapidly, if the temperature is not enough, then raise the temperature to 80°C for 3 hours, then cool down to obtain trimethoxysilane-terminated polysulfide rubber polymer. In order to avoid the reaction between reactants and products and moisture in the air during the reaction process, feeding or discharging, the whole process is completed under the protection of high-purity nitrogen atmosphere.

[0023] The obtained trimethoxysilane-terminated polysulfide rubber polymer was a light brown transparent flowable liquid with a viscosity of 82000 mPa·s as measured by an NDJ-1 rotary viscometer; it was placed in air for 4 hours to dry.

Embodiment 2

[0024] Embodiment 2: 200.0g (0.1mol, molecular weight 2000) of highly dehydrated liquid polysulfide rubber and 59.0g (0.25mol) of gamma-glycidyl etheroxypropyl trimethoxysilane are added in the dry reactor, and Stir evenly, then add 1.5g DMP-30, continue to stir, the system undergoes an exothermic reaction, the temperature rises rapidly, observe the change of reaction temperature, and then react at room temperature for 12 hours to obtain trimethoxysilane-terminated polysulfide rubber polymer. In order to avoid the reaction between reactants and products and moisture in the air during the reaction process, feeding or discharging, the whole process is completed under the protection of high-purity nitrogen atmosphere.

[0025] The obtained trimethoxysilane-terminated polysulfide rubber polymer was a light brown transparent flowable liquid with a viscosity of 75,000 mPa·s as measured by an NDJ-1 rotary viscometer; it was exposed to air for 2 hours.

Embodiment 3

[0026] Example 3: 200.0 g (0.2 mol, molecular weight of 1000) of highly dehydrated liquid polysulfide rubber and 59.0 g (0.30 mol) of γ-glycidyl etheroxypropyl trimethoxysilane were added to a dry reactor, And stir evenly, then add 0.3g DMP-30, continue to stir, the system undergoes an exothermic reaction, and the temperature rises rapidly, if the temperature is not enough, then raise the temperature to 80°C for 3 hours to obtain trimethoxysilane-terminated polysulfide rubber polymer . In order to avoid the reaction between reactants and products and moisture in the air during the reaction process, feeding or discharging, the whole process is completed under the protection of high-purity nitrogen atmosphere.

[0027] The obtained trimethoxysilane-terminated polysulfide rubber polymer was a light brown transparent flowable liquid with a viscosity of 68000 mPa·s as measured by an NDJ-1 rotary viscometer; it was placed in air for 5 hours to dry.

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Abstract

This invention discloses the polysulphide rubber end-capped with silane and its preparation method. Its structural formula is: (I), R is the bivalent organic groups, including (II); R' is the hydrogen or the alkyl, R'' represents the molecular chain of the polysulfide rubber, X is the alkoxy that can be hydrolyzed, n is 1, 2 or 3; The preparation method is: the polysulphide rubber and the silicon with organic functional groups were mixed according to the mol ratio 1:1.5-2.5, and then reacted at 20-120 DEG C for 1-12h under the condition of the high pure inert gas. The polysulphide rubber end-capped with silane related in this invention was made up of lowpolymers or prepolymers which were nigger-brown or colorless, liquid state or semisolid, and their mean molecular weight is 1,200 ~ 12,000. The invention is characterized in that the technique of production is simple, the process is easy to control, the quality of the product is stable and the application is easy.

Description

technical field [0001] The invention relates to polysulfide rubber, in particular to a silane-terminated polysulfide rubber which can be used in the fields of sealants, adhesives, coatings and the like and a preparation method thereof. Background technique [0002] Polysulfide rubber was successfully researched in the United States in 1927, and its first trade name was Thiokol A. After long-term development, three types of products have been developed successively, including liquid polysulfide rubber, solid polysulfide rubber and polysulfide rubber emulsion. At the same time, five types of polysulfide rubber vulcanization systems have been developed successively, including metal oxides, metal Peroxides, inorganic oxidants, organic peroxides, organic oxidants. [0003] Polysulfide rubber was first used in the solid propellant bonding of rocket motors, and then in the sealing of aircraft-related components, and has been widely used in automobiles, containers, construction (su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G75/06C08K5/541
Inventor 马文石
Owner SOUTH CHINA UNIV OF TECH