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Silane modified building sealant primer capable of quickly forming film and having high barrier property

A silane-modified, high-barrier technology, applied in the field of materials, can solve the problems of damaging the bond between sealant and concrete, loose particles, water seepage, 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

Especially for the old concrete surface, the particles are loose and the pores are large. After the primer is applied, it will quickly penetrate into the interior of the concrete, and it is difficult to form a film on the bonding interface, so that the concrete is exposed at the bonding interface. An important primer The function is the barrier property of sealing pores and interfacial film formation. On the one hand, it prevents the alkali water and water-soluble substances produced after concrete meets water from migrating to the bonding interface due to the siphon effect through the pores of the concrete, and erodes the bonding interface; on the other hand , the non-reactive plasticizer in the sealant formula precipitates to the bonding interface due to changes in environmental conditions, and will also erode the bonding interface, thereby destroying the bond between the sealant and concrete, resulting in seal failure and water leakage , water seepage accident

Method used

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  • Silane modified building sealant primer capable of quickly forming film and having high barrier property
  • Silane modified building sealant primer capable of quickly forming film and having high barrier property
  • Silane modified building sealant primer capable of quickly forming film and having high barrier property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120]

[0121]

[0122] Concrete selection and mass percent of each component in table 1 embodiment 1

[0123] 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;

[0124] 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:

[0125]

[0126] 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.

[0127] In this embodiment, the reactive film-forming resin (F) ...

Embodiment 2

[0130]

[0131] Concrete selection and mass percent of each component in table 2 embodiment 2

[0132] 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.

[0133] The preparation method of crosslinking agent (B): 3-aminopropyltrimethoxysilane H 2 N(CH 2 ) 3 Si(OCH 3 ) 3 Mix with 3-glycidyl ether propyl trimethoxysilane (KH-560) at a molar ratio of 1:2, stir and react under nitrogen protection at 70°C for 2 to 4 hours under condensing and reflux, then cool down to room temperature under nitrogen protection, and let stand for 12 hours use.

[0134] The preparation method of the reactive film-forming resin (F) of the silane-terminated polyester hot-melt adhesive (containing 50% ethyl acetate solvent) with the structure of formula (5)...

Embodiment 3

[0140]

[0141] Concrete selection and mass percent of each component in table 3 embodiment 3

[0142] In this embodiment 3, the silane-modified polymer (A) is the silane-modified polyisoprene of formula I(b), and the preparation method is:

[0143] Use hydroxyl-terminated isoprene (mainly 1,2 addition structure, molecular weight 30,000,) use 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 reacted for 3 hour...

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Abstract

The invention discloses a silane modified building sealant primer capable of quickly forming a film and having high barrier property. The silane modified building sealant primer comprises the following components in percentage by mass: 4-45% of a siloxane-based modified polymer (A), 3-30% of a primer cross-linking agent (B), 2-22% of a reactive film-forming resin (F), 0.5-10% of a silane couplingagent (C), 0.001-2% of a catalyst (D) and 10-90% of a solvent (E). The primer composition can be used for pretreating a porous base material bonded by a silane-modified building sealant, and is volatilized along with the solvent after application, the reactive film-forming resin (F) can quickly form a film on the surface of the base material, and the reactive group can be hydrolyzed and cross-linked with the alkoxy modified polymer (A) and the cross-linking agent (B) in the presence of a catalyst when meeting moisture, so that the silane modified building sealant primer has excellent barrier property and hole sealing property 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 rapid film-forming and high-barrier primer for silane-modified building sealants; it belongs 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 WO2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/00C09D115/00C09D7/63
CPCC09D201/00C09D7/63C08L15/00C08K5/5419C08K5/544
Inventor 娄从江
Owner 娄从江
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