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A kind of water-based peelable polyurethane coating and preparation method thereof

A technology of polyurethane coating and water-based polyurethane, which is applied in the field of coatings, can solve problems such as unsuitable applications, and achieve excellent film-forming properties

Active Publication Date: 2018-04-20
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not suitable for some electronic components, such as mobile phones, computer screens, etc., which require that the appearance of the film cannot be affected after coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of silane-modified polyurethane oligomer:

[0030] (1) Preparation of L1:

[0031] In a one-liter four-neck reactor, under the protection of nitrogen, polybutylene adipate (hydroxyl value: 112): 25.0g, IPDI: 18.3g was added to the reactor in turn, adjusted and stirred to 450-550rpm, set Heating temperature is 60℃, add 81.3g of acetone, after 1 hour of reaction, add 10mg of catalyst dibutyltin dilaurate (DBTDL), continue to stir and react for 2 hours, add DMBA (dimethylolbutyric acid, 7.4g) acetone When monitoring the NCO concentration of the solution to reach the expected value, add 25.5 g of organosilicon Tech-2170 (Mn=1700 Tiger additives), maintain this temperature and continue to stir for more than 4 hours. Reduce the internal temperature to 40°C, add 5.1g of triethylamine, adjust the speed to 2000-2500rpm, add 122.6g of water to disperse, maintain high-speed stirring for 30 minutes, adjust the speed to 500-800rpm, vacuum the solvent acetone, get a transluce...

Embodiment 2

[0036] Preparation of water-based peelable paint:

[0037] (1) The formula of P1 is: UH2953 / 1 (Bayer): 90g, L1: 5g, defoamer: 0.2g, wetting agent: 0.3g, thickener: 1.0g, leveling agent: 0.3g, film forming Assistant: 1g. Specific operating procedures: At room temperature, add UH2953 / 1 to a four-necked flask, adjust the rotation speed to 1500rpm, add silane-modified polyurethane oligomer and other additives in sequence, and stir for 30min to obtain the water-based peelable paint P1.

[0038] (2) The operating procedure of P2 is the same as the preparation process of P1. The formula is: UH2953 / 1 (Bayer): 90g, L2: 5g, defoamer: 0.2g, wetting agent: 0.3g, thickener: 1.0g, liquid Ping agent: 0.3g, film-forming aid: 1g.

[0039] (3) The operating procedure of P3 is the same as the preparation process of P1. The formula is: UH2953 / 1 (Bayer): 90g, L3: 5g, defoamer: 0.2g, wetting agent: 0.3g, thickener: 1.0g, liquid Ping agent: 0.3g, film-forming aid: 1g.

[0040] (4) The operating procedure...

Embodiment 3

[0047] A water-based peelable polyurethane coating prepared by using the following components and parts by weight of raw materials: water-based polyurethane 30, silane-modified polyurethane oligomer 0.1, deionized water 20, defoamer 0.04, wetting agent 0.04, leveling Agent 0.04, film-forming aid 0.2.

[0048] Among them, the water-based polyurethane is a polyurethane produced by Bayer with the grade UH2953 / 1, the defoaming agent is mineral oil, the wetting agent is a commercially available grade hydropalat 140 lubricant, the film-forming aid is ethylene glycol, and a leveling agent There are no special requirements.

[0049] The silane-modified polyurethane oligomer is prepared by the following method:

[0050] Mix the polyester polyol and the diisocyanate with stirring, adjust the speed to 300 rpm at 60°C, and react for no less than 2 hours, then add DMBA acetone solution, during this period add the low boiling point organic solvent acetone according to the system viscosity, and co...

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Abstract

The invention relates to a water-based peelable polyurethane coating and a preparation method thereof, which is prepared by using the following components and raw materials in parts by weight: water-based polyurethane 30-70, silane-modified polyurethane oligomer 0.1-20, deionized water 20-70 , defoaming agent 0.04-1.6, wetting agent 0.04-1.6, thickener 0-1.6, leveling agent 0.04-1.6, film-forming aid 0.2-5. Compared with the prior art, the present invention is modified by silane, and can be well dispersed in the anionic water-based polyurethane emulsion by urethane chain segments containing urethane bonds, so that the emulsion has good film-forming properties; The isocyanate group reacts and is connected to the main chain of the polyurethane segment. The silane segment tends to be arranged on the surface of the film when the film is formed, so that the coating film has good peelability, and at the same time when the protective film is removed , and no small molecules will remain on the coated surface, so the mixed emulsion can be used to prepare a peelable film.

Description

Technical field [0001] The invention relates to a coating, in particular to a water-based peelable polyurethane coating and a preparation method thereof. Background technique [0002] In the manufacturing, service industry and other industries, product components must undergo processing, storage, transportation and other links. During this period, the surface of the component is often damaged due to factors such as dust, water droplets, oil, friction, etc., which affects the components. Beauty, performance and longevity. The use of peelable film can solve such problems. The water-based peelable coating is applied to the surface of the substrate by spraying, painting, dipping, etc., which can effectively block the physical and chemical erosion of the surface by dust, moisture, salt spray, acid rain, bacteria, and friction. For some products that require high surface finish, the protection of the peelable film is even more important. Only when these surfaces are well protected i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D7/62C09D7/63C08G18/83C08G18/42
Inventor 郝超张长远季菁华
Owner SHANGHAI RES INST OF CHEM IND
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