Waterborne strippable polyurethane coating and preparation method thereof

A polyurethane coating, water-based polyurethane technology, applied in the field of coatings, can solve problems such as unsuitability for application, and achieve the effect of excellent film-forming performance

Active Publication Date: 2015-09-02
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-port reactor, under nitrogen protection, polybutylene adipate (hydroxyl value: 112): 25.0g, IPDI: 18.3g was added to the reactor in sequence, and the stirring was adjusted to a speed of 450-550rpm. Heating temperature is 60°C, add acetone 81.3g, react for 1 hour, add catalyst dibutyltin dilaurate (DBTDL) 10mg, continue stirring and reacting for 2 hours, add DMBA (dimethylolbutyric acid, 7.4g) acetone Solution, when the NCO concentration reaches the expected value, add 25.5 g of Silicone Tech-2170 (Mn=1700 Tag additive), and keep stirring at this temperature for more than 4 hours. Lower the internal temperature to 40°C, add 5.1g of triethylamine, adjust the rotation speed to 2000-2500rpm, add 122.6g of water to disperse, maintain high-speed stirring for 30min, adjust the rotation speed to 500-800rpm, remove the solvent acetone by vacuum, and obtain a transl...

Embodiment 2

[0036] Preparation of Waterborne Strippable Coatings:

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

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

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

[0040] (4) The operation procedure of P4 is the same as ...

Embodiment 3

[0047] A water-based peelable polyurethane coating, prepared by using the following components and raw materials in parts by weight: 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] Wherein, the water-based polyurethane is the brand UH2953 / 1 polyurethane produced by Bayer, the defoamer is mineral oil, the wetting agent is the commercially available brand hydropalat 140 lubricant, the film-forming aid is ethylene glycol, and the leveling agent There are no special requirements.

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

[0050] Mix and stir the polyester polyol and diisocyanate, at 60°C, adjust the rotation speed to 300rpm, react for not less than 2 hours, then add DMBA acetone solution, during this period, add acetone, a low-boiling organic solvent according to the viscosity of the system, and continue ...

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Abstract

The invention relates to a waterborne strippable polyurethane coating and a preparation method thereof. The waterborne strippable polyurethane coating is prepared from the following components and raw materials in parts by weight: 30-70 parts of waterborne polyurethane, 0.1-20 parts of silane modified polyurethane oligomer, 20-70 parts of deionized water, 0.04-1.6 parts of a defoaming agent, 0.04-1.6 parts of a wetting agent, 0-1.6 parts of a thickening agent, 0.04-1.6 parts of a leveling agent and 0.2-5 parts of a coalescing agent. Compared with the prior art, the waterborne strippable polyurethane coating provided by the invention is modified by silane, contains a polyurethane chain segment of carbamate bonds, and can be well dispersed in anionic waterborne polyurethane emulsion to ensure that the emulsion has good film forming property; and meanwhile, silane is connected to the main chain of the polyurethane chain segment by reacting with isocyanate groups, and a silane chain segment trends to be arranged on the surface of a film during film forming to ensure that a coating film has good stripping property, and when a protective film is stripped off, small molecules cannot be left on a coated surface, so that the mixed emulsion can be used for preparing a strippable film.

Description

technical field [0001] The invention relates to a paint, in particular to a water-based peelable polyurethane paint and a preparation method thereof. Background technique [0002] In manufacturing, service industry and other industries, product components must go through links such as processing, storage, and transportation. During this process, the surface of the components is often damaged due to factors such as dust, water droplets, oil stains, and friction, which affects the quality of the components. Aesthetics, performance and longevity. Such problems can be solved by using a peelable film. Water-based peelable coatings are 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, friction, etc. For some products that require high surface finish, the protection of the peelable film is even more important. Only when thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D7/12C08G18/83C08G18/42
Inventor 郝超张长远季菁华
Owner SHANGHAI RES INST OF CHEM IND
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