Humidity-hardening binding agent

A binder and hardening technology, applied in the field of moisture-hardened binders, including two-component kits, and polyurethane-based binders, can solve the problems of polyurethane-based mechanical properties loss and achieve good adhesion , excellent development prospects, and the effect of simple preparation

Inactive Publication Date: 2007-10-24
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrolysis causes loss of mechanical properties of polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Free radical polymerization is the most widely used method for preparing synthetic polymers. In particular large-scale used plastics such as LDPE, PVC and PMMA are produced almost exclusively by free-radical polymerization. Free radical polymerization is a chain reaction. Chain initiation, chain growth, and chain termination occur sequentially and simultaneously. Compounds which form free radicals by introducing energy, such as azo compounds or peroxy compounds, can be used as initiators. These free radicals react with monomers and initiate chains. During chain growth, the free radicals generated during chain initiation cause stacking of other monomers in multiple additions and thus form polymer chains. Free radicals are highly reactive and interact with controlled diffusion under conditions of combination or disproportionation. Another possible reaction process is the transfer of the active center to eg another chain, a monomer, a solvent molecule or a deliberately...

Embodiment 1

[0149] Silane-modified polyurethane according to method a): Polymer 1

[0150] 1. Preparation of NCO-polyurethane prepolymer

[0151] In a 1 l jacketed three-necked flask with a stirrer, thermometer and reflux cooler and under a nitrogen atmosphere, 69.1 g (0.28 mol) of liquid 4,4'-diphenylmethyl diisocyanate and 736.9 g (0.18 mol) of polypropylene glycol with an average molecular weight of 4000 (NCO / OH ratio about 1.5). Heat to 50° C. and add 50 ppm of dibutyltin dilaurate (parts by weight based on total weight) as a catalyst. Heat to 75[deg.] C. and stir the mixture at this temperature long enough to reach a calculated 0.9% (parts by weight based on total weight) of free NCO groups. The percentage content of free NCO groups can be determined eg by titration (ASTM D2572) or IR spectroscopy.

[0152] 2. Silane modification with secondary γ-aminosilane (such as DYNASYLAN  1189)

[0153] At 75°C, add 45.2 g (0.19 mol) of secondary g-aminosilane n-butylaminopropyl trimethox...

Embodiment 2

[0155] Silane-modified polyurethane according to method b): Polymer 2

[0156] 3. Preparation of OH-terminated polyurethane prepolymer

[0157] In a 1l jacketed three-necked flask with stirrer, thermometer and reflux cooler and under a nitrogen atmosphere, 15.6g (0.07mol) liquid isophorone diisocyanate (MG222g / mol) and 500g ( 0.06 mol) polypropylene glycol with an average molecular weight of 8000 (NCO / OH ratio about 1.2). Heat to 50°C and add dibutyltin dilaurate (50 ppm) as catalyst. Heat to 100° C. and keep the mixture under stirring at this temperature for 1 h. Then cool to 60°C.

[0158] 2. Silane modification using α-isocyanatosilane

[0159] At 60°C, 24.6 g (0.14 mol) of OH-terminated polyurethane prepolymer prepared in 1. Isocyanatosilane Isocyanatomethyltrimethoxysilane (MG177g / mol) and stirred at this temperature for 1h. It was then cooled to room temperature within 2 h. And a silane-terminated polyurethane (polymer 1) was obtained. The NCO content is 0% (IR sp...

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Abstract

To provide a transparent structure retrieval function while optimizing an MXL document-relational table schema mapping definition.A mapping definition tuning module 105 refers to issuing history of a structure retrieve formula to change a schema-to-schema mapping definition 109 so that an XML document is properly divided and stored in a relational database 105 and a structure retrieval engine 106 for the purpose of enhancing the efficiency of retrieval processing with high issuing frequency. A structure retrieval formula conversion module 102 converts the structure retrieval formula based on the schema-to-schema mapping definition 109. A query execution control module 103 issues queries to the relational database 105 and the structure retrieval engine 106, respectively, and reconstitutes a result for the original structure retrieval formula from the respective results.

Description

field of invention [0001] The present invention relates to a moisture-curing polyurethane-based adhesive, in particular for industrial and construction applications. In addition, the invention also relates to a kit comprising two components for the preparation of a moisture-curing adhesive, to a method for the preparation of a moisture-curing adhesive and to a product obtained from the moisture-curing adhesive. Moisture-hardening adhesive. Background of the invention [0002] Long-term, with at least one reactive silane group (these silane groups can contain hydroxyl groups or hydrolyzable groups attached to the silicon, such as alkoxy, acetoxy, oxime, benzamide or also chlorine atoms) , room temperature crosslinkable and silane-terminated polyurethanes, preferably with two or three reactive silane groups, are used for the preparation of adhesives and sealants as well as other industrial and construction products such as screeds, floor coverings, paints and coatings. Paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/10C08F8/42C09K3/10
CPCC08G18/10C09J175/04C08L2666/04C08G18/289C08G18/718C09J133/06C09J133/08
Inventor H·马克
Owner CONSTR RES & TECH GMBH
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