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A method of polyurethane sealing and preparation method of acrylics

A technology of polyurethane sealant and acrylate, applied in the field of sealant, can solve the problems of inability to directly add polyurethane sealant, large viscosity change unfavorable construction, high activity of small molecule monomers, etc., to eliminate foaming and pinhole phenomenon, sticky Wide range of knots and easy control

Active Publication Date: 2021-11-26
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of polyurethane sealants used outdoors is poor weather resistance, easy chalking, and cracking. Easy to break under light exposure
[0005] Acrylic resin is widely used in coatings, paints and adhesives because of its excellent weather resistance, but most of the commercially available macromolecular and large molecular weight acrylates have high glass transition temperature (Tg), poor compatibility with polyurethane, and cannot be directly added To the polyurethane sealant, or need to add a large amount of solvent to dissolve, and the hydroxyl content in the resin is too high, which is unfavorable to the design of the formula; the acrylic resin with a small molecular weight is added to the sealant, and it is easy to precipitate in the later use process, reducing the Weather-resistant type; due to the high activity of acrylate monomers, the viscosity changes in the middle and late stages of adding to the sealant are not conducive to construction
[0006] Moreover, the market is mainly solvent-based, which is not environmentally friendly, and the activity of small molecule monomers is high, so it cannot be directly added to polyurethane sealants

Method used

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  • A method of polyurethane sealing and preparation method of acrylics
  • A method of polyurethane sealing and preparation method of acrylics
  • A method of polyurethane sealing and preparation method of acrylics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Step 1. Synthesis of acrylate-modified isocyanate group I:

[0054] Under the protection of nitrogen, add 55.25g (0.12mol) of 1,6-hexamethylene diisocyanate trimer in the three-necked flask, add 30g of dry ethyl acetate, 0.05g of hydroquinone, after dissolving, pass Slowly add 4.64g (0.04mol) of 2-hydroxyethyl acrylate dropwise into the constant pressure dropping funnel, react at 50°C for 4h, and titrate the NCO value.

[0055] Step 2, the synthesis of acrylate-modified polyurethane resin A:

[0056] Under nitrogen protection, add 800g (0.1mol) of polyether diol (Mr=8000), 120g (0.02mol) of polyether triol (Mr=6000), 27.86g (0.16mol) ) of toluene diisocyanate, 59.4g (0.1mol) of acrylate-modified isocyanate group I, 150g of didecyl phthalate, and 0.02% of the total mass of the above mixture of tin octoate, react at 80°C for 2-5h , react until the free NCO reaches the theoretical value.

[0057] Wherein, the polyether diol is polyoxyalkylene diol, and the polyether tri...

Embodiment 2

[0060] Step 1, the synthesis of acrylate-modified polyurethane resin B:

[0061] Under nitrogen protection, add 800g (0.1mol) of polyether diol (Mr=8000), 120g (0.02mol) of polyether triol (Mr=6000), 4.8g (0.03mol) ) of 2,3-dihydroxypropyl methacrylate, 55.72g (0.32mol) of toluene diisocyanate, 0.15g of hydroquinone, 150g of didecyl phthalate, and accounting for the total mass of the above mixture 0.02% tin octoate is reacted at 80°C for 2-5 hours until the free NCO reaches the theoretical value.

[0062] Wherein, the polyether diol is polyoxyethylene diol, and the polyether triol is polyoxyalkylene triol.

[0063]Step 2. Preparation of polyurethane sealant: Add acrylate modified polyurethane resin B, plasticizer, liquid acrylate M-6200 into the planetary stirring tank, stir for 15 minutes, then add dry modified calcium carbonate, PVC paste resin and charcoal Black and mix under vacuum for 10 minutes, increase the mixing speed and mix for 15 minutes after the filler is wette...

Embodiment 3

[0065] Step 1, polyurethane resin synthesis:

[0066] Under nitrogen protection, 1200g (0.1mol) of dry polyether diol (Mr=8000), 120g (0.02mol) of polyether triol (Mr=6000), 45.28g (0.26 mol) of dimethyl diphenylmethane diisocyanate, 150g of didecyl phthalate, and 0.01% tin octoate accounting for the total mass of the above mixture, react for 2-5h at a temperature of 65°C, and react Stop the reaction until the free NCO reaches the theoretical value.

[0067] Wherein, the polyether diol is polyoxypropylene diol, and the polyether triol is polyoxypropylene triol.

[0068] Step 2. Preparation of polyurethane sealant: Add unmodified polyurethane resin, plasticizer, diethylene glycol acrylate (DEGDA), liquid acrylate to the planetary stirring tank M-7300K, min, then add dry modified calcium carbonate, PVC paste resin and carbon black, and mix under vacuum for 10 minutes, increase the mixing speed and mix for 15 minutes after the filler is wetted, add adhesion promoter, catalyst,...

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Abstract

The invention relates to the technical field of sealants, in particular to an acrylate-modified polyurethane sealant and a preparation method thereof, comprising the following raw materials in parts by weight: 20-60 parts of acrylic-modified polyurethane resin, 1-10 parts of liquid acrylate, 15-35 parts of plasticizer, 20-50 parts of filler, 0.5-3 parts of adhesion promoter, 0.05-3 parts of catalyst, 0.05-3 parts of water remover, and 0.05-3 parts of stabilizer. In the present invention, by using acrylate-modified polyurethane resin and adding liquid acrylate resin, the prepared sealant can be used in the natural environment in the later stage, and the energy of ultraviolet light irradiation can be transferred to the acrylate bond, making it slow Cross-linking protects the urethane bond in the sealant system, and at the same time, the cross-linking of acrylate further improves the weather resistance of the sealant, has a wide range of adhesion, and improves the service life of the polyurethane sealant outdoors.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to an acrylate-modified polyurethane sealant and a preparation method thereof. Background technique [0002] At present, the sealant used in outdoor construction is mainly silicone glue. Although silicone glue has good weather resistance, silicone glue has a strong smell, pollutes stone materials, is easy to mold, and has poor adhesion to concrete. The use of ketone glue, with the improvement of people's awareness of chemical products, further deepens the recognition of product functional characteristics, environmental protection, outstanding weather resistance, and excellent bonding characteristics will become the main development trend of outdoor sealants. [0003] In order to solve the pollution of the glue and the base material and the environmental protection problem, the manufacturer has developed a silane-modified polyether "MS" sealant and a silane-modified polyurethane sea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14C09J133/04C09J11/04C09J11/06C09J11/08C08G18/81C08G18/76C08G18/48
CPCC08G18/4812C08G18/7614C08G18/7671C08G18/8125C08K2003/265C08L2205/03C09J11/04C09J11/06C09J11/08C09J175/14C08L33/04C08L27/06C08K13/06C08K3/26C08K3/04C08K5/12
Inventor 张志文李桂妃周传军黄华詹锋张志军
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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