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A high water-resistance primer for silane-modified building sealants

A silane modification and sealant technology, applied in the field of materials, can solve the problems of increasing the risk of bonding failure, poor water resistance and hydrolysis resistance, and high polarity of silicone resin, so as to solve the problem of porous and fragile interface bonding, high efficiency Barrier properties, the effect of optimizing adhesive properties

Active Publication Date: 2021-10-29
娄从江
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number of 2014108307412 discloses a primer for silane-modified polyether sealant and its preparation method, which can be directly coated on the substrate to be bonded, and then sizing on the surface of the substrate after a few minutes The process can enhance the bonding strength between the silane-modified polyether sealant and the substrate. Even if the substrate is soaked in water for a long time, the silane-modified polyether sealant is completely bonded to the substrate, but the silicone resin is extremely The primer has the disadvantages of poor low temperature flexibility and poor compatibility with silane-modified sealants
The Chinese patent with the publication number CN107474726 A discloses a primer, which has poor water resistance and hydrolysis resistance, especially the alkalinity of concrete after encountering water, which increases the risk of bonding failure in a long-term water environment.

Method used

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  • A high water-resistance primer for silane-modified building sealants
  • A high water-resistance primer for silane-modified building sealants
  • A high water-resistance primer for silane-modified building sealants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086]

[0087]

[0088] Concrete selection and mass percent of each component in table 1 embodiment 1

[0089] In this embodiment 1, the silane-modified polymer (A) is a silane-terminated polybutadiene of formula I(a), that is, in the structural formula of formula I(a), m1=0, R 2 for -CH 2 CH 2 CH 2 -, p=0, R 4 for -CH3;

[0090] R in Formula III a , R b , R c , R d , R e and R f Both are H atoms, the range of x1+x2 is 10% to 60%, the range of x3 is 40% to 90%; x4=0; the unit structure of which the molar content is x3 – CH2-CH=CH-CH2-, has The following two isomeric forms:

[0091]

[0092] Specifically in the present embodiment, select the product of commercially available Evonik for use EP ST-M is a silane-modified polymer (A), which is trimethoxysiloxane-terminated polybutadiene with a number-average molecular weight of 3500 g / mol and an average functionality of siloxane of 6.9 to 7.2.

[0093] The cross-linking agent (B) has a polysiloxane polymer o...

Embodiment 2

[0098]

[0099] Concrete selection and mass percent of each component in table 2 embodiment 2

[0100] Same as in Example 1, the silane-modified polymer (A) is a silane-terminated polybutadiene of formula I(a) EP ST-M. 1146 is a commercial product of EVONIK, which is an oligomer copolymerized with aminosilane and alkylsilane, and is used as the silane coupling agent (C) in this embodiment.

[0101] The preparation steps are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0103]

[0104]

[0105] Concrete selection and mass percent of each component in table 3 embodiment 3

[0106] In this embodiment 3, the silane-modified polymer (A) is a silane-modified polyisoprene of formula I(b), and the preparation method is: using hydroxyl-terminated isoprene (1,2 addition structure is Mainly, the molecular weight is 30000,) using hydroxyl-terminated polybutadiene (POLY R-15, commercially available from CRAY VALLEY in the United States, obtained by free radical polymerization, with a number average molecular weight of 2500 to 2800 mol / g, and an average hydroxyl group functionality of 2.2 to 2.6) was mixed at a mass ratio of 1:1 and heated to 110°C And vacuum stirring and dehydration for 2h, and cooling to room temperature, the mixture of the obtained hydroxyl-terminated polybutadiene and hydroxyl-terminated polyisoprene is used as a raw material, firstly mixed with TDI (toluene diisocyanate, commercially available Commercially available) was reac...

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Abstract

The invention discloses a highly water-resistant primer for silane-modified building sealants, which comprises: 5% to 50% of alkoxy-modified polymer (A), 3% to 50% of crosslinking agent (B), 0.5% to 10% of silane coupling agent (C), 0% to 2% of catalyst (D), and 10% to 90% of solvent (E). The primer can be used to pretreat porous substrates joined by silane-modified building sealants. After the primer is applied, the solvent volatilizes, and after being cured by moisture, it is hydrolyzed and cross-linked by siloxane groups. Porous substrate bonding interface film formation, the cured film-forming polymer contains a large amount of non-polar main chain structure, has excellent hydrolysis resistance, and the siloxane-cured bonding point and the bonded sealant have excellent adhesion Therefore, it can improve the bonding ability between the sealant and the substrate, and is suitable for most of the commercially available silane-modified sealants, such as modified silicone (MS), silane-terminated polyurethane (SPU) , Silane-terminated polyether (STPE) and other sealants.

Description

technical field [0001] The invention relates to a primer, in particular to a highly water-resistant primer used for silane-modified building sealants; it belongs to the field of material technology. Background technique [0002] Building sealant is an adhesive used to firmly stick different building materials together, and most of them have good viscosity. However, due to the wide range and diversity of bonding objects, as well as the uncertainty of use conditions, construction sealants need to use a primer (or primer liquid) to improve the bonding between the sealant and the substrate in actual use. The effect, and practice has also proved that in some bonding parts that require relatively high bonding effect, the use of primer can achieve satisfactory bonding strength and bonding stability. [0003] Both at home and abroad, they are committed to optimizing and improving the performance of primers. Adhesion promoter compositions as disclosed in PCT application WO2007 / 0352...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D147/00C09D183/04C09D115/00C09D7/63
CPCC09D5/002C09D115/00C09D147/00C09D183/04C09D7/63C08L83/04C08K5/544C08K5/5435C08L47/00
Inventor 娄从江
Owner 娄从江
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