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Primer coating for polyurethane sealant and preparation method thereof

A polyurethane sealant and primer technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of long waiting time, narrow use range, slow curing speed, etc., to reduce waiting time, improve production efficiency, fast curing effect

Active Publication Date: 2013-05-22
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the existing polyurethane sealant primer contains organic solvents and needs to be dried, resulting in slow curing speed, long waiting time, low production efficiency and narrow application range, the purpose of the present invention is to provide a fast curing and high A primer with initial tack strength to effectively improve production efficiency, enhance adhesion with different substrates, and shorten curing time; another purpose of the present invention is to provide a simple process, easy to operate, strong practicability, and easy to popularize and use The preparation method of solid primer with high initial bonding strength for polyurethane sealant

Method used

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  • Primer coating for polyurethane sealant and preparation method thereof

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Embodiment

[0025] Weigh 50-70 parts by mass of polyol and 5-10 parts of non-reactive thermoplastic resin, adjust the temperature to 130°C to melt, and dry the melt for 45 minutes under the condition of less than 10mba; in protective gas (dry nitrogen or In the presence of carbon dioxide), add a certain amount of polyisocyanate and melt it uniformly, react at 110~130°C for 30~45min, until the isocyanate content is 2~5%; then add 5~15 parts by mass of silane compound, mix well, Finally, 10-20 parts by mass of polyisocyanate is added, mixed evenly, and reacted for 15-25 minutes to obtain a quick-drying solid primer with high initial bonding strength for polyurethane sealants.

[0026] The molar ratio of the polyhydroxy compound to the polyisocyanate compound is 1: 2.1 to 2.3; according to the above primer manufacturing process, the following 1-5 examples are obtained, as shown in Table 1. The following examples can further illustrate the present invention , but does not limit the invention....

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Abstract

The invention discloses a primer coating for a polyurethane sealant, in particular relates to a primer coating with high initial adhesive strength for the polyurethane sealant and a preparation method thereof and belongs to the technical field of adhesives. The primer coating is prepared from the following raw materials: 50-70 parts of hard resin containing isocyanate groups, 5-15 parts of silane compound, 10-20 parts of polyisocyanate and 5-10 parts of non-reactive thermoplastic resin. The polyurethane primer coating prepared by the method has high initial adhesive strength for different base materials and is high in curing speed and firm in adhesion, the polyurethane adhesive / sealant can be coated without waiting, and the production efficiency of the automobile glass assembly line can be improved.

Description

technical field [0001] The invention relates to a primer for polyurethane sealants, in particular to a quick-drying primer for polyurethane sealants with fast initial bonding strength, which belongs to the technical field of adhesives. Background technique [0002] Polyurethane sealants have excellent bonding strength, mechanical properties, durability, acid and alkali resistance, and organic solvent resistance. They are widely used in automobile assembly, product assembly, building waterproofing and other fields. Moreover, the solvent-free polyurethane sealant The production further expands the application field of the material. However, although polyurethane sealant itself has high tensile strength, when it is applied to bond substrates with impermeable surfaces such as glass, aluminum plate, steel, plastic, etc., the phenomenon of peeling of the sealant from the substrate often occurs , rather than internal failure of the sealant. At present, the more economical and eff...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D175/06C09D133/12C09D133/10C09D7/12
Inventor 王金良周晓楠王建莉王金涛邢艳君沈政
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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