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Primer for polyurethane sealing gum and preparation method thereof

A polyurethane sealant and primer technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as difficulty in wide application and promotion, cracking and peeling of primer film, and bonding failure.

Active Publication Date: 2013-04-17
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of primer can effectively promote the bonding between the polyurethane sealant and the surface-dense substrate, the primer film is relatively brittle after curing. However, after the primer film is hardened, it is easy to crack and fall off from the substrate, resulting in bonding failure. Therefore, it is difficult for this primer to be widely used and promoted in actual engineering.

Method used

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  • Primer for polyurethane sealing gum and preparation method thereof
  • Primer for polyurethane sealing gum and preparation method thereof
  • Primer for polyurethane sealing gum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A preparation method for primer for polyurethane sealant, comprising the following steps:

[0068] Step 1, add 20 parts by mass of E-35 epoxy resin and 4 parts by mass of TDiol-400 (Tianjin No. water for 3 hours, then add 6 parts by mass of toluene diisocyanate to the reactor, mix well, adjust the temperature of the reactor to 65°C, and react for 2 hours, then add 0.05 parts by mass of dibutyltin dilaurate to the reactor, continue React for 1h to obtain the first mixed solution;

[0069] Step 2, measure the weight percent content of the isocyanate group in the first mixed solution to be 4.9%, keep the temperature in the reactor constant, and add 68 parts by mass of ethyl acetate and 0.5 parts by mass of ethyl acetate after drying and dewatering Dispersible carbon black, obtains the second mixed solution;

[0070] Step 3, the second mixed solution is input into the ball mill through the pipeline, and the circular grinding is carried out for 3 hours. During the grinding...

Embodiment 2

[0075] Step 1: Add 24 parts by mass of E-51 epoxy resin and 3.9 parts by mass of TDiol-700 (Tianjin No. water for 3 hours, then add 5.5 parts by mass of diphenylmethane-4,4'-diisocyanate into the reactor, mix well, adjust the temperature of the reactor to 70°C, and react for 2.5 hours, then add 0.03 The stannous octoate of mass parts continues reaction 1.5h, obtains the first mixed solution;

[0076] Step 2, measure the weight percent content of the isocyanate group in the first mixed solution to be 2.5%, keep the temperature in the reactor constant, and add 65 parts by mass of ethyl acetate and 1.5 parts by mass of ethyl acetate after drying and dewatering Dispersible carbon black, obtains the second mixed solution;

[0077] Step 3, the second mixed solution is input into the colloid mill through the pipeline, and the circular grinding is carried out for 4 hours. During the grinding process, high-purity nitrogen is used for protection, and then 0.15 mass parts of UV-320 and ...

Embodiment 3

[0082] Step 1, add 20 mass parts of E-44 epoxy resin, 3.5 mass parts of TDiol-700 (Tianjin No.3 Petrochemical), 1.5 mass parts of TMN-700 (Tianjin No.3 Petrochemical) to the reactor to adjust The temperature is 90°C, the vacuum degree is not lower than 0.095, water is removed for 2.5 hours, and 5.5 parts by mass of diphenylmethane-4,4'-diisocyanate is added to the reaction kettle, and the temperature of the reaction kettle is adjusted to After reacting for 3 hours at 75°C, add 0.1 parts by mass of dibutyltin dilaurate to the reactor, and continue the reaction for 1 hour to obtain the first mixed solution;

[0083] Step 2, measure the weight percent content of the isocyanate group in the first mixed solution to be 5.4%, keep the temperature in the reactor constant, and add 70 parts by mass of acetone and butyl acetate, and 2 parts by mass of After the highly dispersible carbon black, obtain the second mixed solution;

[0084] Step 3, the second mixed solution is input into the...

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Abstract

The invention discloses a primer for polyurethane sealing gum and a preparation method thereof. The primer comprises the following components: 10-45 parts of matrix resin containing isocyanate groups, 0.01-0.7 part of catalyst, 55-85 parts of urethano-grade solvent, 0-3 parts of pigment, 0.1-0.5 part of light stabilizer, 0.1-0.5 part of antioxidant, 0.5-5 parts of silicane adhesion promoter and 0.1-1.5 parts of moisture scavenging agent. The preparation method comprises the following steps of: preparing a first mixed solution; after the weight percentage content of the isocyanate groups in the first mixed solution is stable by measuring, preparing a second mixed solution; and circularly grinding the second mixed solution for 2-8 hours under the protection of high-purity nitrogen gas, adding the light stabilizer, the antioxidant, the catalyst, the silicane adhesion promoter and the moisture scavenging agent in turn, and continuously grinding for 0.5-2.0 hours to obtain the primer for the polyurethane sealing gum. By adopting the primer, a transition layer can be provided when the polyurethane sealing gum is used for bonding a difficultly-permeable substrate, and the bonding effect and the bonding firmness can be remarkably enhanced.

Description

Technical field [0001] The present invention involves the field of sealing glue for bottom coating technology, especially the bottom coating agent and its preparation method of a polyurethane sealing glue. Background technique [0002] Polyurethane sealing has excellent adhesive strength, mechanical mechanical performance, durability, acid -alkali resistance and organic solvents, etc., and is widely used in automotive assembly and building waterproof. [0003] However, although polyurethane sealant has a high tensile strength itself, when it is applied to a substrate material that is difficult to penetrate on the adhesive surface, such as: ordinary glass, aluminum plates, black -side glass for cars, concrete grinding surfaces, etc., etc.,, concrete with grinding surfaces, etc.Its bonding strength is often lower than the expected safety indicators or structural indicators, and sealing and substrate peeling usually occur instead of internal agglomeration damage of sealing.Therefore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D175/08
Inventor 丁云香靳晓雨吴朝森王宇旋任绍志
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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