Unlock instant, AI-driven research and patent intelligence for your innovation.

High extensibility silicone seal adhesive for concrete expansion joint and its preparing method

A silicone sealant, high elongation technology, applied in the field of sealant, can solve the problem of low elongation, achieve the effect of improving co-bonding performance and performance improvement

Active Publication Date: 2006-02-15
GUANGZHOU GLORYSTAR CHEM
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elongation rate of the existing various silicone sealants is relatively low, only 350-450%, which cannot meet the large deformation of these joints under various external factors, such as temperature, shear force, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High extensibility silicone seal adhesive for concrete expansion joint and its preparing method
  • High extensibility silicone seal adhesive for concrete expansion joint and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of chain extender:

[0043] (1) 179 g of CH 2 ==CH(CH 2 ) 10 H and 69 grams of CH 2 ==CH(CH 2 ) 12 H is made into a mixture;

[0044] (2) Add 197 grams of viscosity (25°C) 15mm slowly within 20 minutes at 120°C 2 / s of methyl hydrogen silicone oil Me 3 SiO(MeHSiO) n SiMe 3 and 10ppm of H 2 PtCl 6 (in Pt);

[0045] (3) Stir and react at 130°C for 4 hours, and after evaporating low boilers, a viscosity of 140mm is obtained. 2 / s Me 3 SiO(MeC 12 h 25 SiO)x (MeC 14 h 29 SiO) y (MeHSiO)zSiMe 3 . Its reaction formula can be expressed as follows:

[0046]

[0047]

[0048] Preparation of capping agent:

[0049] In the reactor containing 51.6 grams of dimethyldiethoxysilane, add 48.4 grams of polysilicate ethyl (Ethyl silicate 40), 29.3 grams of water and 300 grams of dioxane, the mixture in the packed tower Heating to 100° C. for reaction, and then distilling off the solvent and the alcohol formed in the condensation to obtain 3...

Embodiment 2

[0059] Preparation of chain extender:

[0060] (1) 197 grams of CH 2 ==CH(CH 2 ) 10 H and 69 grams of CH 2 ==CH(CH 2 ) 12 H is made into a mixture;

[0061] (2) Add 197 grams of viscosity (25°C) 15mm slowly within 45 minutes at 100°C 2 / s of methyl hydrogen silicone oil Me 3 SiO(MeHSiO) n SiMe 3 and 10ppm of H 2 PtCl 6 (in Pt);

[0062] (3) Stir and react at 130°C for 6 hours, after removing low boilers, the viscosity is 140mm 2 / s Me 3 SiO(MeC 12 h 25 SiO) x (MeC 14 h 29 SiO) y (MeHSiO)zSiMe 3 , the desired chain extender.

[0063] Preparation of capping agent:

[0064] In the reactor containing 51.6 grams of dimethyldiethoxysilane, add 48.4 grams of polysilicate ethyl (Ethyl silicate 40), 29.3 grams of water and 300 grams of dioxane, the mixture in the packed tower Heating to 100° C. for reaction, and then distilling off the solvent and the alcohol formed in the condensation to obtain 34.7 g of reactant with a hydroxyl content of 6.25% by weight. Then...

Embodiment 3

[0073] Preparation of chain extender:

[0074] (1) 197 g of CH 2 ==CH(CH 2 ) 10 H and 69 grams of CH 2 ==CH(CH 2 ) 12 H is made into a mixture;

[0075] (2) Add 197 grams of viscosity (25°C) 15mm slowly within 20 minutes at 120°C 2 / s of methyl hydrogen silicone oil Me 3 SiO(MeHSiO) n SiMe 3 and 10ppm of H 2 PtCl 6 (in Pt);

[0076] (3) Stir and react at 130°C for 4 hours, and after removing low boilers, the viscosity is 140mm 2 / s Me 3 SiO(MeC 12 h 25 SiO) x (MeC 14 h 29 SiO) y (MeHSiO)zSiMe 3 , the desired chain extender.

[0077] Preparation of capping agent:

[0078] In the reactor containing 41.6 grams of dimethyldiethoxysilane, add 50.4 grams of polysilicate ethyl (Ethyl silicate 40), 23.3 grams of water and 250 grams of dioxane, this mixture in the packed tower Heating to 110° C. for reaction, and then distilling off the solvent and the alcohol formed in the condensation to obtain 43.7 g of reactant with a hydroxyl content of 7.25% by weight. The...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Login to View More

Abstract

The sealing silicone adhesive consists of DMC 100 portions, alkali catalyst 0.001-1 portions, gas phase white carbon black 10-20 portions, calcium carbonate 50-150 portions, blocking agent 0.01-0.5 portions, chain expander 0.1-2 portions and composite curing agent 3-10 portions. The preparation process includes compounding chain expander, blocking agent and composite curing agent; throwing DMC, chain expander and alkali catalyst into reactor to prepare basic silicone rubber; compounding base material with the basic silicone rubber and blocking agent in kneading machine; and mixing the base material and the composite curing agent to obtain product. The sealing silicone adhesive has an elongation of 640-650 %.

Description

technical field [0001] The invention relates to a sealant applied to concrete expansion joints of buildings, especially a silicone sealant. Background technique [0002] During the construction of roads, bridges, airstrips, etc., it is often necessary to reserve expansion joints to avoid pavement cracks due to thermal expansion and contraction. However, expansion joints are prone to water seepage and accumulation of foreign matter. Water seepage will cause the pavement to be soft and sink, and the accumulation of foreign matter will restrict the movement of the joints, which will bring great harm to the use of buildings. Therefore, it is often necessary to fill the joints with sealing materials. On the premise of relieving the stress inside the concrete, it can prevent water and foreign matter from accumulating in the gaps and prolong the service life of roads, bridges, and airstrips. [0003] Traditionally applied to the sealing of concrete expansion joints, there are sea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09J183/00C09K3/10E04B1/68
Inventor 莫万全
Owner GUANGZHOU GLORYSTAR CHEM