Acidic and transparent silicone weather-resistant sealant for construction

A construction and sealant technology, applied in the direction of adhesives, adhesive additives, dyed low-molecular-weight organic compounds, etc. The problem of harsh glue environment, etc., can achieve the effect of broadening the wavelength of absorbed light, reducing the influence of external humidity and temperature, and improving the conversion efficiency.

Active Publication Date: 2015-01-07
ZHEJIANG TIME NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The research on silicone sealants in my country started later than in Europe and the United States, and foreign high-end products have long occupied the dominant position in the market. Domestic silicone sealants have been able to compete with similar foreign products in terms of mechanical properties, hydrophobicity and air permeability, but in terms of weather resistance and There is still a big gap between the application and installation compared with foreign countries, which is mainly reflected in the fact that the colloids of the same kind of domestic products have been used on large glass curtain walls for one year, and the yellowing phenomenon has occurred, especially when used in humid and hot coastal areas, the yellowing phenomenon is more serious; On the one hand, domestic silicone sealants take a long time to crosslink and cure at room temperature when sizing, and have high surface cleaning requirements for the bonded materials, and are also relatively harsh on the sizing environment (temperature, humidity, etc.)

Method used

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  • Acidic and transparent silicone weather-resistant sealant for construction

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Hydroxyl-terminated polydimethylsiloxane 80000 mPa·s: 25 parts

[0023] Hydroxyl-terminated polydimethylsiloxane 200000 mPa·s: 25 parts

[0024] Methyl-terminated polydimethylsiloxane 500 mPa·s: 20 parts

[0025] Modified fumed silica 150 m 2 / g: 10 parts

[0026] Methyltriacetoxysilane: 5 parts

[0027] Dibutyltin diacetate: 0.05 parts

[0028] 2,3-dihydroxy-4-n-decyloxybenzophenone: 0.04 parts

[0029] Tris(1,2,2,6,6-pentamethylpiperidinyl) phosphite: 0.01 parts

[0030] The preparation method of the modified fumed silica is as follows: (1) firstly carry out a coupling modification treatment on the surface of fumed silica with vinyl tris (β-methoxyethoxy) silane; (2 ) The primary modified silica and vinyl silicone oil are subjected to secondary coating and grafting modification under peroxide conditions.

[0031] The above-mentioned acidic transparent silicone weather-resistant sealant for construction is prepared by the following steps: (1) adding hydroxyl-ter...

example 2

[0033] Hydroxyl-terminated polydimethylsiloxane 10000 mPa·s: 50 parts

[0034] Hydroxyl-terminated polydimethylsiloxane 1000000 mPa·s: 100 parts

[0035] Methyl-terminated polydimethylsiloxane 1000 mPa s: 140 parts

[0036] Modified fumed silica 400 m 2 / g: 60 parts

[0037] Methyltriacetoxysilane: 25 parts

[0038] Ethyltriacetoxysilane: 10 parts

[0039] Propyltriacetoxysilane: 5 parts

[0040] Dibutyltin dilaurate: 0.5 parts

[0041] 2,3-dihydroxy-4-n-decyloxybenzophenone: 0.1 parts

[0042] Tris(1,2,2,6,6-pentamethylpiperidinyl) phosphite: 0.4 parts

[0043] The above raw materials were uniformly mixed according to the method of Example 1 to prepare an acidic transparent silicone weather-resistant sealant.

example 3

[0045] Hydroxyl-terminated polydimethylsiloxane 10000 mPa·s: 10 parts

[0046] Hydroxyl-terminated polydimethylsiloxane 400000 mPa·s: 90 parts

[0047] Methyl-terminated polydimethylsiloxane 100 mPa·s: 50 parts

[0048] Modified fumed silica 200 m 2 / g: 25 servings

[0049] Ethyltriacetoxysilane: 15 parts

[0050] Dibutyltin dilaurate: 0.1 part

[0051] Dioctyltin dilaurate: 0.1 parts

[0052] 2,3-dihydroxy-4-n-decyloxybenzophenone: 0.1 parts

[0053] Tris(1,2,2,6,6-pentamethylpiperidinyl) phosphite: 0.1 parts

[0054]The above raw materials were uniformly mixed according to the method of Example 1 to prepare an acidic transparent silicone weather-resistant sealant.

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Abstract

The invention relates to an acidic and transparent silicone weather-resistant sealant for construction, and belongs to the technical field of adhesives. The acidic and transparent silicone weather-resistant sealant is prepared from the following components in parts by weight: 50-150 parts of hydroxyl terminated polydimethylsiloxane, 20-140 parts of methyl terminated polydimethylsiloxane, 10-60 parts of fumed silica, 5-40 parts of a cross-linking agent, 0.05-0.5 part of a catalyst and 0.05-5 parts of a composite anti-yellowing agent. The acidic and transparent silicone weather-resistant sealant has the advantages of high strength, good adhesive performance, excellent weather resistance, quick crosslinking curing at room temperature and the like, and can be widely applied to weather-resistant sealing of glass curtain walls, glass daylighting roofs and other constructional engineering.

Description

technical field [0001] The invention relates to an acidic transparent silicone weather-resistant sealant for construction and a preparation method thereof, belonging to the technical field of adhesives. Background technique [0002] Silicone sealant is a kind of building sealing material, which can withstand the outward movement of joints to achieve the purpose of airtightness and watertightness. The molecular structure of silicone sealant contains Si-O bond, and its bond energy is as high as 425 kJ / mol, which is far greater than the C-C bond energy (345 kJ / mol) and C-O bond energy (351 kJ / mol). Therefore, its stability Good, with strong mechanical properties; coupled with the large molecular volume and low cohesive energy density of polysiloxane, it has excellent stain resistance, high and low temperature resistance, high hydrophobicity and good air permeability, etc. , can be used for a long time in the range of -60~200℃, and its mechanical properties such as tensile stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/06C09J11/04C09C1/28C09C3/08C09C3/10
Inventor 林菊琴
Owner ZHEJIANG TIME NEW MATERIAL
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