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Environment-friendly high urea linkage fast curing single component polyurea material and preparation method thereof

A fast-curing, high-urea bond technology, which is applied in the field of environment-friendly high-urea-bond fast-curing one-component polyurea material and its preparation, one-component polyurea material and its preparation field, can solve the problem of long curing time, low content of urea bond in the coating, Slow and other problems, to achieve the effects of shortened curing time, 100% solid content, and broad application prospects

Active Publication Date: 2019-12-03
李泽阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Since this material contains solvents and a large amount of fillers, it is not environmentally friendly in actual use, and due to solvent volatilization and excessive fillers, cracks are prone to occur during operation after curing;
[0005] (2) This kind of material is slowly solidified by absorbing moisture in the air. Generally, the surface drying time needs more than 10 hours, and the hard drying time needs more than 72 hours, which does not meet the needs of rapid repair in practical applications;
[0007] (4) The NCO content of this type of material is less than 3%, and finally only less than 1.5% of NCO reacts with the amino group after the unblocking of the latent curing agent to form urea bonds, so the urea bond content in the formed coating is very low, resulting in Problems such as easy hydrolysis and aging in practical application
[0008] According to many literature studies, the hydrolysis resistance of urethane bonds is far lower than that of urea bonds. If the urea bonds are low, more hydroxyl groups and isocyanate groups (NCO) are required to react in the system, and ammonia The ester bond will be relatively increased, resulting in a decrease in the hydrolysis resistance of the cured material, that is to say, it is easy to absorb water and age, thus affecting the durability of use in the hydraulic environment
[0009] Therefore, in order to solve the above-mentioned problems such as long curing time, non-environmental protection, low urea bonds, and easy hydrolysis and aging, it is urgent to develop a new type of high urea bond, solvent-free, 100% solid content, green environmental protection, fast curing, low temperature construction, One-component polyurea material with high bonding strength to the base surface and suitable for rapid repair and anti-seepage reinforcement of water conservancy projects

Method used

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  • Environment-friendly high urea linkage fast curing single component polyurea material and preparation method thereof
  • Environment-friendly high urea linkage fast curing single component polyurea material and preparation method thereof
  • Environment-friendly high urea linkage fast curing single component polyurea material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The following is a specific example of an environmentally friendly high urea bond single-component polyurea material provided by the present invention, and the specific formula ratio is shown in Table 1:

[0071] Table 1 Composition and content

[0072]

[0073]

[0074] Wherein, the NCO content of the prepolymer of this embodiment is 11.8%, and the number of moles of NCO can be calculated, and then 2-methylimidazole is 4 times of the number of moles of NCO.

[0075] Due to the relatively high viscosity of the polyurea-type liquid filler, it is easy to hang on the wall during the production process, so it should be produced in a larger amount than the actual amount used during production, and then take out the required amount from the produced polyurea-type liquid filler. Serving size is used.

[0076] The preparation method of the above-mentioned environment-friendly high urea bond rapid curing single-component polyurea material comprises the following steps:

...

Embodiment 2

[0102] The following is a specific example of another environmentally friendly high urea bond single-component polyurea material provided by the present invention, and the specific formula ratio is shown in Table 3:

[0103] Table 3 Composition and content

[0104]

[0105]

[0106] Wherein, the preparation method of the above-mentioned environment-friendly high urea bond rapid curing single-component polyurea material comprises the following steps:

[0107] (1) Prepare blocked isocyanate prepolymer, the specific steps are as follows:

[0108] 1) Reaction conditions: nitrogen protection;

[0109] 2) The above-mentioned polyols PTMG2000 and PCDL2000, the hydroxyl chain extender BDO, and the hydroxyl cross-linking agent TMP are respectively subjected to water removal treatment, and the above-mentioned polyols PTMG2000 and PCDL2000, the hydroxyl chain extender BDO and the hydroxyl cross-linking agent TMP are respectively added to the high-speed Disperse in a vacuum kettle...

Embodiment 3

[0132] According to the test method of 7.14 of the national standard GB / T23446-2009, the environmental protection type high urea bond rapid curing single-component polyurea material and the commercially available single-component polyurea material prepared by embodiment 1 and embodiment 2 are tested for water absorption, the result Such as image 3 shown, from image 3 It can be seen that the water absorption rate of the environment-friendly high urea bond rapid curing one-component polyurea material prepared in Example 1 and Example 2 is much lower than that of the commercially available one-component polyurea material.

[0133] The low water absorption rate is mainly due to the high urea bond of the material, and the low water absorption rate means that when used in a water environment, it absorbs no or less water, and the molecular structure is not affected by water and changes, which means it has good performance in the water environment. The stability and durability are ...

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Abstract

The invention provides an environment-friendly high urea linkage fast curing single component polyurea material. The environment-friendly high urea linkage fast curing single component polyurea material is prepared from the following components in parts: 80-140 parts of blocked isocyanate prepolymer, 5.5-7 parts of a polyurea liquid filler, 30-40 parts of amine-terminated polyether, 5-10 parts ofa terminated amino chain extender, 4-6 parts of a solid filler and 1-2 parts of an auxiliary agent. According to the environment-friendly high urea linkage fast curing single component polyurea material, the polyurea liquid filler can improve the urea linkage content of a system, and the solvent-free solid content is 100%, thereby ensuring high durability used in water environment. The environment-friendly high urea linkage fast curing single component polyurea material has good mechanical properties, environmental protection is achieved, hydrolysis resistance is achieved, and the material canbe thick coated into a film at a time, cured fast, and is suitable for quick repair needs of water conservancy projects, and the like. In addition, the environment-friendly high urea linkage fast curing single component polyurea material has a simple preparation method and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, and relates to a single-component polyurea material and a preparation method thereof, in particular to an environment-friendly high urea bond rapid curing single-component polyurea material and a preparation method thereof. Background technique [0002] Polyurea elastomer is formed by reacting hydroxyl polyether / amino polyether with polyisocyanate to generate isocyanate-terminated semi-prepolymer (component A), and then combined with amino-terminated polyether, amino-terminated chain extender and other additives The constituent resin component (B component) reacts to form an elastomeric material with a high urea bond content. The main difference between polyurethane and polyurea is whether it contains urea bonds or not. The content of urea bonds in polyurea elastomers is greater than that of urethane bonds, while polyurethane does not contain urea bonds and only contains urethane bond...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/75C08G18/69C08G18/66C08G18/48C08G18/44C08G18/50C08G18/12C08G18/28C08G18/32
CPCC08G18/12C08G18/285C08G18/289C08G18/3206C08G18/3228C08G18/44C08G18/4854C08G18/5021C08G18/6677C08G18/698C08G18/755C08G18/758C08G18/79
Inventor 李炳奇李泽阳李泽月
Owner 李泽阳
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