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End vinylsiloxane rubber cold curing method with controllable time of operation

An operation time and vinyl-terminated technology, applied in the field of room temperature curing of vinyl-terminated silicone rubber, can solve the problems that the vulcanization process cannot be carried out normally, reduce the comprehensive performance of silicone rubber, and the curing speed cannot be controlled, so as to improve storage stability and delay. Curing time, easy design effect

Inactive Publication Date: 2009-02-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, some substances will cause irreversible poisoning (permanent poisoning) of the catalyst, causing the vulcanization process to fail to proceed normally, and compounds containing alkynyl and vinyl groups are widely used as a delayed inhibitor without causing irreversible poisoning to inhibit the catalytic activity of platinum
At present, the commonly used inhibitor at room temperature is 1,3-divinyltetramethyldisiloxane, but in actual operation, 1,3-divinyltetramethyldisiloxane can be used better at lower room temperature , and the curing speed cannot be controlled at higher room temperature, if the dosage is increased, the overall performance of silicone rubber will be reduced

Method used

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  • End vinylsiloxane rubber cold curing method with controllable time of operation
  • End vinylsiloxane rubber cold curing method with controllable time of operation
  • End vinylsiloxane rubber cold curing method with controllable time of operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The base glue is selected from low-viscosity vinyl-terminated polysiloxane with a viscosity of 1800mPa s, branched-chain vinyl polysiloxane with a viscosity of 4000mPa s and high-viscosity vinyl-terminated polysiloxane with a viscosity of 7000mPa s. :107-Vi glue with moderate viscosity obtained by compounding at a mass ratio of 1:2, adding hexamethylsilazane to 15g of precipitated white carbon black for every 100g of 1800mPa·s low-viscosity vinyl-terminated polysiloxane And 2g high hydrogen-containing silicone oil, hydrogen content 1.58%wt. Mix the base rubber, filler, and crosslinking agent according to the formula ratio, first manually stir to make the filler and the base rubber preliminarily mix, then grind the rubber material through a three-roll mill for 3 to 4 times, so that the filler is evenly dispersed in the base rubber, and take it out Standby to obtain component A with a viscosity of 18000mPa·s.

[0032] The synthesis of the catalyst is to add a solution of...

Embodiment 2

[0035] A component is the same as Example 1, and the viscosity is 18000mPa·s.

[0036] The preparation of the toluene solution of platinum tetravinyl tetramethylcyclotetrasiloxane complex was the same as in Example 1. Take out 8g of the toluene solution of the platinum complex and add 2.74g of tetramethyltetravinylcyclotetrasiloxane, which is component B.

[0037] Mix component A and component B at a mass ratio of 500:1, stir, vacuumize to remove air bubbles, cure at 40°C for 8 hours, and then release the mold. The operation time is respectively: the scorch time T10 is 2396s, the positive vulcanization time T90 is 3360s, and the curing reaction time ΔT is 964s. The mechanical properties of the product are tensile strength of 1.85MPa, elongation at break of 120%, Shore A hardness of 35, and permanent deformation of 2%.

Embodiment 3

[0039] The base glue for component A is low-viscosity vinyl-terminated polysiloxane with a viscosity of 1500mPa s, branched-chain vinyl polysiloxane with a viscosity of 4000mPa s and high-viscosity vinyl-terminated polysiloxane with a viscosity of 7000mPa s. 107-Vi glue with moderate viscosity obtained by compounding oxane in a mass ratio of 7:1:2, adding hexamethylsilazane to every 100g of 1500mPa·s low-viscosity vinyl-terminated polysiloxane to treat precipitation method White carbon black 15g and hydrogen-containing silicone oil 5g, hydrogen content 1.0%wt. Mix the base rubber, filler, and crosslinking agent according to the formula ratio, first manually stir to make the filler and the base rubber preliminarily mix, then grind the rubber material through a three-roll mill for 3 to 4 times, so that the filler is evenly dispersed in the base rubber, and take it out Standby to obtain component A with a viscosity of 15000mPa·s.

[0040] The preparation of the toluene solution ...

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Abstract

The invention discloses a method for terminal vinyl silicone rubber cold curing with the operation time controllable. The method can precisely regulate and control the operation time of silicon rubber cold curing; the operation time endures from several minutes to several hours, and the design of the curing process is greatly facilitated. The method includes the following steps: (1) preparation of composition A; (2) preparation of composition B: toluene solution with 0.2-0.4 weight percent of platinum complex co ordinative with platiniferous vinyl siloxanes is prepared; (3) the toluene solution with 0.2-0.4 weight percent of platinum complex is taken out, tetravinyl tetramethyl cyelo tetrasiloxane is added into the solution, and component B is obtained under low storage temperature, wherein, the tetravinyl tetramethyl cyelo tetrasiloxane is inhibitor, the addition is 0.2-1.2 times of the mass of the toluene solution with 0.2-0.4 weight percent of platinum complex taken out; by regulating the dosage, the silicon rubber cold curing method with controllable operation time can be achieved.

Description

technical field [0001] The invention relates to a method for curing silicone rubber at room temperature, in particular to a method for curing vinyl-terminated silicone rubber at room temperature with controllable operation time. Background technique [0002] Addition type room temperature curing silicone rubber refers to polysiloxane containing vinyl (abbreviated as base rubber) and cross-linking agent hydrogen-containing silicone oil under the action of platinum catalyst at room temperature through the addition of silicon hydrosilicon to form a three-dimensional network structure. Elastomer, addition-type RTV silicone rubber does not produce by-products during the vulcanization process, has a very small shrinkage rate, and can be vulcanized deeply, so it can be used to prepare products with high purity, high transparency, and high precision. There are usually two packaging forms of addition RTV silicone rubber, as shown in Table 1. [0003] Table 1 Packaging forms o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L83/07C08K5/5425C08K3/36C08K3/34
Inventor 陈双俊张军
Owner NANJING UNIV OF TECH
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