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Aliphatic polyurethane curing agent and preparation method thereof

An aliphatic polyurethane and curing agent technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of inability to use concrete structure protective topcoat, low elasticity or elongation at break, poor weather resistance, etc., and achieve excellent physical properties Mechanical properties, satisfying durability, and the effect of excellent durability

Inactive Publication Date: 2015-12-16
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular structure of the above-mentioned aliphatic polyurethane curing agent does not contain flexible molecular segments, and the coating film formed after cross-linking and curing tends to have high strength, but low elasticity or elongation at break
The anti-corrosion paint for concrete structures requires the paint film to have good elasticity to adapt to the deformation of the concrete base without cracking. These curing agents currently on the market are difficult to meet these technical requirements.
[0004] Related patent literature (Chinese patent application: 201010607572.8) reports the preparation method of polyurethane elastic curing agent, which is limited to aromatic polyurethane, and this type of curing agent is easy to yellow due to containing benzene ring structure, and has poor weather resistance, so it cannot be used for Concrete structure protective topcoat, so it is necessary to develop an aliphatic elastic curing agent, which can cross-link with active hydroxyl paint components to form a weather-resistant protective paint film with excellent elasticity, which is used for concrete structure protection

Method used

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  • Aliphatic polyurethane curing agent and preparation method thereof
  • Aliphatic polyurethane curing agent and preparation method thereof
  • Aliphatic polyurethane curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The preparation of aliphatic polyurethane curing agent of the present invention:

[0071] The proportioning ratio of each component of the aliphatic polyurethane curing agent of the present invention is as follows: 28g HDI biuret, 25g liquid polycarbonate diol, 35g butyl acetate and 3g HDI trimer;

[0072] Add the liquid polycarbonate diol into the reactor, raise the temperature to 110°C, dehydrate under vacuum (-0.05~0.09MPa) for 30min, then cool down to 75°C; then add butyl acetate and HDI biuret, 75 Stir at constant temperature for 2 hours at ℃; then cool down to 40℃, add HDI trimer, stir for 30 minutes, and filter to obtain the aliphatic polyurethane curing agent of the present invention.

Embodiment 2

[0074] The preparation of aliphatic polyurethane curing agent of the present invention:

[0075] The proportioning ratio of each component of the aliphatic polyurethane curing agent of the present invention is as follows: 30g HDI biuret, 30g liquid polycarbonate diol, 40g butyl acetate and 5g HDI trimer;

[0076] Add the liquid polycarbonate diol into the reactor, raise the temperature to 120°C, dehydrate under vacuum (-0.05~0.09MPa) for 30min, then cool down to 85°C; then add butyl acetate and HDI biuret, 85 Stir at constant temperature for 2 hours at ℃; then cool down to 45℃, add HDI trimer, stir for 30 minutes, and filter to obtain the aliphatic polyurethane curing agent of the present invention.

Embodiment 3

[0078] The technical parameters of the aliphatic polyurethane elastic curing agent prepared in Examples 1 and 2 and the aliphatic polyurethane elastic curing agent in the prior art are shown in Table 1 and Table 2, respectively.

[0079] Table 1: Technical parameters of the aliphatic polyurethane elastic curing agent prepared in Examples 1 and 2

[0080]

[0081] Table 2: Technical parameters of aliphatic polyurethane elastic curing agent in the prior art

[0082]

[0083] Conclusion: aliphatic polyurethane elastic curing agent of the present invention compares with prior art curing agent, and the former isocyanate (NCO) content is lower, and non-volatile matter content is also lower simultaneously, and it is mainly because aliphatic polyurethane of the present invention A flexible polycarbonate structure is introduced into the molecular structure of the elastic curing agent, thereby reducing the NCO content and non-volatile matter, and improving the elasticity of the al...

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Abstract

The invention provides an aliphatic polyurethane curing agent and preparation method thereof. The aliphatic polyurethane curing agent comprises the following raw materials by weight: 25 to 45 parts of HDI biuret, 15 to 35 parts of liquid polycarbonate dihydric alcohol, 35 to 45 parts of butyl acetate and 1 to 20 parts of HDI trimer. The curing agent provided by the invention has the characteristics of high strength and high elasticity and is used for preparing weather-resistant protective paint film with excellent elasticity. Moreover, the aliphatic polyurethane curing agent is applied as a curing agent component of surface lacquer in a thinly-coated polyurethane waterproof layer used for the floor of a high-speed railway bridge; and the prepared modified polyurethane waterproof surface lacquer has good environment adaptability, application properties, excellent physical and mechanical properties and excellent durability, so the surface lacquer can better meet the requirements for durability, service life and waterproof effect of a waterproof layer used for a railway concrete base.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an aliphatic polyurethane curing agent and a preparation method thereof. Background technique [0002] Polyurethane curing agent refers to containing active isocyanate and can cross-link with paint components containing active hydroxyl to form a paint film with various properties. The aliphatic polyurethane curing agent can cross-link with the active hydroxyl-containing paint components to form a paint film with excellent weather resistance, which is used for the anti-corrosion finish paint of steel structures. [0003] The currently commercially available aliphatic polyurethane curing agents are mainly dimers of HDI (hexamethylene diisocyanate) such as biuret and trimer, and these curing agents can be cross-linked with hydroxyl acrylic resin or hydroxyl-terminated polyester resin reaction to form a protective coating film with excellent weather resistance. However...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/12C08G18/78C08G18/79C08G18/44C08G18/62C08G18/10
Inventor 杜存山祝和权张恒刘演新
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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