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Modified polyurea and its application

A modification and raw material technology, applied in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problem of poor color retention and UV resistance, inability to be flexibly used in small scales, and poor substrate material wettability, etc. problems, to achieve the effect of simple and convenient construction operation, prolonging the construction time limit, and increasing the construction time limit

Active Publication Date: 2021-12-28
SHANGHAI CARPOLY PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the construction time limit of polyurea material is very short, and the gel time is only a few seconds to a few minutes. It is required to use special equipment during construction, which cannot be used flexibly on a small scale, and the cost of wood paint coating equipment is high; and, due to If the curing speed is too fast, the wettability of the adhesive film to the base material is not good, which affects the adhesion, the film forming is complicated, the appearance is easy to form defects such as orange peel, and the color retention and UV resistance are poor.

Method used

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  • Modified polyurea and its application
  • Modified polyurea and its application
  • Modified polyurea and its application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] In one of the embodiments, the preparation method of the monofunctional isocyanate comprises the following steps:

[0068] Mix the toluene diisocyanate, auxiliary agents and aliphatic unit alcohols for reaction, and stop the reaction when the -NCO content in the system is less than 15%.

[0069] In one embodiment, the temperature of the reaction is 40°C-60°C, and the reaction time is 6h-10h.

[0070] In one of the embodiments, the auxiliary agent includes an antioxidant;

[0071] The amount of the antioxidant added is 0.05% to 0.15% by mass of the total mass of raw materials for preparing the monofunctional isocyanate.

[0072] In one of the embodiments, the antioxidant is 2,6-di-tert-butyl-p-methylphenol, also known as 2,6-di-tert-butyl-4-methyl-phenol, or 3,5 -3,5-di-tert-butyl-4-hydroxytoluene, hereinafter abbreviated as BHT-264.

[0073] In one of the embodiments, the auxiliary agent also includes a solvent;

[0074] The solvent is at least one selected from est...

Embodiment 1

[0095] This embodiment provides a modified polyurea and its application.

[0096] (1) Preparation of monofunctional isocyanate 1

[0097] Put 174.16g (1 mole) of T-100, 130.22g (1 mole) of isooctyl alcohol, 34g of butyl acetate and 2g of BHT-264 into the reaction kettle, blow nitrogen gas, and raise the temperature to 40°C~42°C , reacted for 6 hours, when the NCO% was 12.3%, cooled to room temperature, filtered and packaged to obtain monofunctional isocyanate 1, the performance results are shown in Table 1.

[0098] (2) Preparation of modified polyurea 1

[0099] Mix monofunctional isocyanate 1 and F520 polyaspartic acid ester resin at a molar ratio of -NCO: -NH of 1:1, and stir evenly to obtain modified polyurea 1. The performance results are shown in Table 2.

Embodiment 2

[0101] This embodiment provides a modified polyurea and its application.

[0102] (1) Preparation of monofunctional isocyanate 2

[0103] Put 174.16g (1 mole) of T-80, 16g of butyl acetate and 3g of BHT-264 into the reactor, blow nitrogen, heat up to 58°C to 60°C, and drop 130.22g (1 mol) of isooctyl alcohol is added for 2 hours. After the dropwise addition, react at 58°C to 60°C for 4 hours. When the NCO% is 13.0%, cool down to room temperature, filter and package to obtain monofunctional isocyanate 2. The performance results are shown in Table 1.

[0104] (2) Preparation of modified polyurea 2

[0105] Mix monofunctional isocyanate 2 and F520 polyaspartic acid ester resin at a molar ratio of -NCO: -NH of 1:1, and stir evenly to obtain modified polyurea 2. The performance results are shown in Table 2.

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Abstract

The invention relates to a modified polyurea and its application. The raw materials for the preparation of the modified polyurea include: monofunctional isocyanate and amino resin containing secondary amino groups; the molar ratio of -NCO in the monofunctional isocyanate to -NH in the amino resin containing secondary amino groups is 1:1 ~1:2; the structural formula of the monofunctional isocyanate is shown in formula (I), and R represents a hydrocarbon group. Its construction time limit can reach 300 minutes, high solid content, low VOC emission, simple and convenient construction operation, low requirements for equipment, low temperature curing and thick coating construction, the formed coating has high hardness, good toughness, and no adhesion to the substrate. Good strength, good weather resistance, good chemical corrosion resistance, excellent comprehensive performance, and broad application prospects.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a modified polyurea and its application. Background technique [0002] With the vigorous development of the wood furniture market, correspondingly, wood lacquer also has a broad application market. In practical application, in addition to requiring the paint film formed by wood lacquer to have excellent performance, at the same time, it is not easy to spray on furniture with various carvings (protrusions or grooves), so it is also required that wood lacquer can be applied flexibly, and The investment cost of coating equipment should be low. [0003] Nowadays, solvent-free, low-pollution green coatings such as water-based coatings, high-solid and radiation-cured coatings, and powder coatings have been widely used in large quantities. Among these green coatings, spray polyurea materials are one of the important varieties. Polyurea is a product obtained by reacting an isocyanate component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/71C08G18/64C09D175/02C09D5/08
CPCC08G18/714C08G18/6415C09D175/02C09D5/08
Inventor 莘建忠郑振杰
Owner SHANGHAI CARPOLY PAINT
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