Single-component polyurea coating and preparation method thereof

A single-component, polyurea technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of reducing the waterproof and anti-corrosion effect of products, affecting the physical properties of coating films, etc., and achieve excellent physical properties, bright colors, and weather resistance good effect

Pending Publication Date: 2020-07-28
SWD HIGH TECH MATERIALS JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN106497371B discloses a kind of one-component polyurea coating and preparation method thereof, although this one-component polyurea coating has higher mechanical properties, but the terminal isocyanate group prepolymer (NCO group) in the coating and When the moisture in the air undergoes cross-linking reaction, carbon dioxide will be generated, and the generated carbon dioxide will generate air bubbles or pinholes in the film, which will affect the physical properties of the coating film and reduce the waterproof and anti-corrosion effect of the product.

Method used

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  • Single-component polyurea coating and preparation method thereof
  • Single-component polyurea coating and preparation method thereof
  • Single-component polyurea coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Stir and mix polyether polyol, polyester polyol and pigments and fillers according to the parts by weight in Table 1.1, heat up to 120°C, and carry out vacuum dehydration for 2 hours under the condition of vacuum degree of -0.08Mpa;

[0034] After cooling down to 45°C, add 10 parts of liquefied MDI, heat up to 80°C and store for 2 hours;

[0035] According to the parts by weight in Table 1.2, add amine chain extenders and organic solvents, cool down to 60°C and store for 1 hour;

[0036] When the measured NCO group content is 2.8%, lower the temperature to below 45°C, add 2 parts of latent curing agent, keep stirring for 30 minutes, filter and discharge the material, and obtain the one-component polyurea coating A.

[0037] Table 1.1

[0038] Material parts by weight / part High activity polyether GEP330N 20 T-1136 special structure linear polyester polyol 10 Titanium dioxide 10

[0039] Table 1.2

[0040] contents parts by ...

Embodiment 2

[0042] Stir and mix polyether polyol, polyester polyol and pigments and fillers according to the parts by weight in Table 2.1, heat up to 120°C, and carry out vacuum dehydration for 2 hours under the condition of vacuum degree of -0.08Mpa;

[0043] After cooling down to 45°C, add 30 parts of liquefied MDI, heat up to 80°C and store for 2 hours;

[0044] According to the parts by weight in Table 2.2, add amine chain extenders and organic solvents, cool down to 60°C and store for 1 hour;

[0045] When the NCO group content was measured to be 2.8%, the temperature was lowered to below 45°C, 6 parts of latent curing agent was added, and after 30 minutes of heat preservation and stirring, the material was filtered and discharged to obtain a one-component polyurea coating B.

[0046] Table 2.1

[0047] Material parts by weight / part High activity polyether GEP551C 40 T-1136 special structure linear polyester polyol 20 carbon black 20

[0048] Table ...

Embodiment 3

[0051] Stir and mix polyether polyol, polyester polyol and pigments and fillers according to the parts by weight in Table 3.1, heat up to 120°C, and carry out vacuum dehydration for 2 hours under the condition of vacuum degree of -0.08Mpa;

[0052] After cooling down to 45°C, add 20 parts of liquefied MDI, heat up to 80°C and store for 2 hours;

[0053] According to the parts by weight in Table 3.2, add amine chain extender and organic solvent, cool down to 60°C and store for 1 hour;

[0054] When the measured NCO group content is 2.8%, lower the temperature to below 45°C, add 3 parts of latent curing agent, keep warm and stir for 30 minutes, then filter and discharge to obtain one-component polyurea coating C.

[0055] chart 3.1

[0056] Material parts by weight / part High activity polyether GEP330N 30 T-1136 special structure linear polyester polyol 15 big red powder 15

[0057] Table 3.2

[0058] contents parts by weight / part ...

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Abstract

The invention discloses a single-component polyurea coating and a preparation method thereof. The single-component polyurea coating is prepared from liquefied MDI, polyether polyol, polyester polyol,pigment filler, an amine chain extender and a latent curing agent. Compared with the prior art, according to the technical scheme provided by the invention, a proper amount of latent curing agent is added into the preparation components; the latent curing agent preferentially reacts with water to generate alkylol amine or primary amine, the produced amine reacts with isocyanate, and CO2 is not generated, so that pores and bubbles are not generated on a coating film, the bonding strength with concrete or a cement base material is high; meanwhile, the mechanical property of the coating film is more excellent.

Description

technical field [0001] The invention relates to the technical field of polyurea coatings, in particular to a single-component polyurea coating and a preparation method thereof. Background technique [0002] Buildings exposed to sulfate, chloride, CO 2 Under the action of corrosive media in the air such as gas, it will cause rust and corrosion of steel bars, and cracks will occur when concrete absorbs water and expands, thereby reducing the service life of buildings. Spraying polyurea elastomer technology is a rapid prototyping thick coating construction technology on the surface of objects. After the technology is formed, it can form an overall dense, continuous and seamless high-strength, high-elastic coating, and has good wear resistance. The impact performance and marine weather aging resistance can better reduce the corrosion rate of buildings under the influence of severe weather. Polyurea elastomer is composed of terminal isocyanate prepolymer (NCO group) and amino c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D7/61C08G18/66C08G18/48C08G18/42C08G18/64
CPCC08G18/4018C08G18/42C08G18/48C08G18/6415C08G18/6603C08K2003/2241C08L2201/08C09D175/02C09D7/61C08K3/22C08K3/04
Inventor 王道前连联益肖国亮
Owner SWD HIGH TECH MATERIALS JIANGSU
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