Primer for silane modified building sealant

A technology of silane modification and primer, applied in the field of materials, can solve the problems of poor compatibility, poor flexibility, poor water resistance and hydrolysis resistance, etc.

Active Publication Date: 2020-05-08
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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  • Primer for silane modified building sealant
  • Primer for silane modified building sealant
  • Primer for silane modified building sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135]

[0136]

[0137] Concrete selection and mass parts of each component in table 1 embodiment 1

[0138] In this embodiment 1, the γ-trimethoxysilane end-capped polybutadiene of silane-modified polymer (A) is the product of commercially available Evonik for selection EP ST-M, the specific structure and description are detailed in the specification part.

[0139] In this example, the crosslinking agent (B) is a methylphenyl silicone resin containing multiple methoxysilyl groups. It is prepared by referring to the methods of WO2008 / 107331, WO 2015 / 057851 and WO 2015 / 158624: Add 1400g of phenyltrimethoxysilane (or PTMO) and methyltrimethoxysilane (or MTMO) into a four-necked flask with a dropping funnel (connected to vacuum during distillation), reflux water condenser, stirrer and thermometer 600g (Ph / Me=1.6 / 1, mol / mol) was stirred and mixed, stirred at room temperature and mixed with 40g of 20% aqueous hydrochloric acid solution, heated to 65-68°C under condensation...

Embodiment 2

[0142]

[0143]

[0144] Concrete selection and mass parts of each component in table 2 embodiment 2

[0145] Same as in Example 1, silane-modified polymer (A) is silane-terminated polybutadiene EP ST-M, the crosslinking agent (B) is also the methylphenyl silicone resin with an average molar mass of 1100g / mol and a viscosity of 30cPs at 23°C prepared in Example 1; the silane-modified polymer (P) is selected STP-E 10, commercially available from Wacker Chemie, is α-dimethoxysilane-terminated polypropylene glycol, whose hydrolytic crosslinking does not require organometallic catalysts, and can promote the hydrolysis and crosslinking of other compounds containing trimethoxysilane structures. Linkage, its specific structure as described in the description; 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.

[0146] The specific preparation steps of ...

Embodiment 3

[0148]

[0149] Concrete selection and mass parts of each component in table 3 embodiment 3

[0150] In this embodiment 3, the silane-modified polymer (A) is a mixture of silane-modified polyisoprene and silane-modified polybutadiene of formula I, and the preparation method is: using hydroxyl-terminated isoprene ( 1, 2 addition structure is the main, molecular weight is 30000,) using hydroxyl-terminated polybutadiene R-15 (commercially purchased from CRAY VALLEY in the United States, obtained by free radical polymerization, number average molecular weight 2500 to 2800 mol / g, average functionality of hydroxyl group 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...

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Abstract

The present invention relates to a primer composition. which comprises: 100 parts by mass of an alkoxy-modified polymer (A) having a P1-[(CR<1>2)a-Si(OR<2>)bR<3>(3-b)]c structure, 10 to 250 parts by mass of a cross-linking agent (B) containing more than three alkoxy silicon groups, 5 to 80 parts by mass of a silane coupling agent C comprising at least more than 1 part by mass of a nitrogen-containing organosilane coupling agent (C<1>) having a ZkSiR<23>1(OR<24>)mO(4-k-l-m)/2 unit, 0 to 10 parts by mass of a catalyst (D), and a solvent (E) in an amount satisfying m(E)/m (primer) of 0.5 to 0.9.The primer composition can be used for pretreating a porous base material bonded by a silane-modified building sealant, is hydrolyzed and cross-linked in the presence of moisture after being applied,has excellent hydrolysis resistance and sealant precipitate erosion resistance after being cured, and can be suitable for most of silane modified sealants sold in the market, such as modified silicone(MS), silane terminated polyurethane (SPU), silane terminated polyether (STPE) and the like.

Description

technical field [0001] The invention relates to a primer, in particular to a primer for silane-modified building sealant, belonging to the technical field of materials. 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 / 035255, which are advantageously u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D115/00C09D183/06C09D171/02C09D7/63
CPCC08L2205/025C08L2205/03C09D115/00C09D171/02C09D183/06C09D7/63C08L15/00C08K5/544C08K5/5435C08L71/02C08L83/06C08K5/5425C08K5/5415
Inventor 娄从江
Owner 娄从江
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