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Polyurethane coating for shoes and manufacturing method of coating of polyurethane coating

A technology of polyurethane coatings and polyester polyols, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems that the reaction speed bubbles cannot escape the resin body, the problem of coating bubbles, and the separation of leather fabrics. Achieve the effect of improving interlayer peeling strength, high peeling strength of coating, and improving hydrophobicity

Active Publication Date: 2022-05-13
FOSHAN NANHAI QIHONG SHOES MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production and application, due to the fast reaction speed and too thick coating of the two-component polyurethane coating in the process of spraying or flow coating, the air bubbles cannot escape from the resin body, and tiny air bubbles are formed in the coating.
In the process of spraying or flow coating production, the reserve of paint is large, and it is difficult for the paint to dissipate heat. Therefore, during spraying or flow coating, the temperature of the paint is generally high (greater than 100°C) due to the heat release during chain extension. Polyurethane coatings Excessively high temperature makes the bubbles in the tiny holes on the upper or sole edge expand, and the problem of bubbles in the coating cannot be solved after the product is formed.
Moreover, the coating after the product is formed still has the problems of low peel strength and poor hydrophobicity, especially the problem of glue separation on leather fabrics

Method used

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  • Polyurethane coating for shoes and manufacturing method of coating of polyurethane coating
  • Polyurethane coating for shoes and manufacturing method of coating of polyurethane coating
  • Polyurethane coating for shoes and manufacturing method of coating of polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3 and comparative example 1-3

[0052] Examples 1-3 and Comparative Examples 1-3 are polyurethane coatings.

[0053] The raw materials or component contents of the polyurethane coatings of Examples 1-3 of the present invention and Comparative Examples 1-3 are shown in Table 1 below.

[0054] The raw material of table 1 embodiment 1-3 and comparative example 1-3 polyurethane coating or component content

[0055]

[0056] *In the table, the molecular weight of polyester polyol is 2000, the molecular weight of polyether polyol is 2000, and the mass content of dehydrated potassium aluminum sulfate dodecahydrate in the glycerol solution is 10%.

[0057] The preparation method of polyurethane coating is as follows:

[0058] (1) Add isocyanate, polyester polyol, polyether polyol, water remover (carbodiimide) and diluent (propylene carbonate) into the reaction kettle, stir evenly, and react at 100°C for 7 hours , remove air bubbles in vacuum (-0.095MPa), cool to room temperature to obtain component A;

[0059]...

Embodiment 4-6 and comparative example 4-10

[0062] Examples 4-6 and Comparative Examples 4-10 are finished shoes with polyurethane coatings.

[0063] The polyurethane coatings used in the coatings of the finished shoes of Examples 4-6 of the present invention and Comparative Examples 4-10 and the materials of the uppers are shown in Table 2 below.

[0064] The polyurethane coating of finished shoes is produced as follows:

[0065] (1) Put the upper of the shoe upwards, and set a coating line around the shoe between the sole and the shoe opening;

[0066] (2) make above-mentioned any kind of polyurethane coating flow down from the coating line to the sole along the coating line, the polyurethane coating is coated in the area of ​​the coating line and the bottom edge of the sole to form a coating film, the diameter of the nozzle is 10mm during coating, During the flow coating process, the pigment is mixed with the polyurethane coating to make the coating form a specific pattern;

[0067] (3) Curing and forming at room t...

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Abstract

The invention belongs to the technical field of polyurethane coatings, and particularly relates to a polyurethane coating for shoes and a manufacturing method of a coating of the polyurethane coating. The polyurethane coating is prepared from a component A and a component B, the component A is prepared from the following raw materials: isocyanate, polyester polyol, polyether polyol, a water removal agent and a diluent, and the component B is prepared from polyether polyol, 1, 4-butanediol, a catalyst, a glycerin solution of dehydrated aluminum potassium sulfate dodecahydrate, 2-hydroxyethyl disulfide and caprolactone-terminated polydimethylsiloxane. 2-hydroxyethyl disulfide and caprolactone-terminated polydimethylsiloxane are added, and the dosage and proportion of the 2-hydroxyethyl disulfide and caprolactone-terminated polydimethylsiloxane and a chain extender 1, 4-butanediol are regulated, so that the peel strength between the coating and the vamp is higher, the hydrophobicity is higher, and the coating is more durable. And bubbles in tiny holes at the edge of the vamp or the sole are prevented from expanding due to overheat chain extension.

Description

technical field [0001] The invention belongs to the technical field of polyurethane coatings, and in particular relates to a polyurethane coating for shoes and a method for preparing the coating. Background technique [0002] Although the existing transparent moisture-proof polyurethane paint can realize the transparent and bubble-free effect in the laboratory. However, in actual production and application, because the two-component polyurethane coating reacts too fast and the coating is too thick in the process of spraying or flow coating, the bubbles cannot escape from the resin body, and tiny bubbles are formed in the coating. In the process of spraying or flow coating production, the reserve of paint is large, and it is difficult for the paint to dissipate heat. Therefore, during spraying or flow coating, the temperature of the paint is generally high (greater than 100°C) due to the heat release during chain extension. Polyurethane coatings Excessively high temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C08G18/32C08G18/38C08G18/42C08G18/48C08G18/61C08G18/66
CPCC09D175/04C08G18/61C08G18/3855C08G18/3206C08G18/42C08G18/48C08G18/4018C08G18/6607
Inventor 孙维忠陈姝晓
Owner FOSHAN NANHAI QIHONG SHOES MATERIAL CO LTD
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