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Polyurethane sealant

A technology of polyurethane sealant and acetyl tributyl citrate, applied in the field of materials, can solve the problems of poor water resistance, poor weather resistance, and poor heat resistance, and achieve the effects of improving weather resistance and water resistance.

Inactive Publication Date: 2018-05-04
苏州炽蓝生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing polyurethane sealants also have some disadvantages, such as: storage stability is greatly affected by packaging and the outside world, heat resistance is not very good, weather resistance is poor, polar groups are hydrophilic, so water resistance is not good, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Isocyanates are the basic raw materials for the preparation of polyurethanes. Among them, 1,5-naphthalene diisocyanate (NDI) has a rigid aromatic naphthalene ring structure and a relatively high melting point (127°C). The PU synthesized from it has incomparable properties of any other polyurethane elastomer, such as excellent dynamic properties, high mechanical properties, outstanding cutting resistance, wear resistance and temperature resistance, etc., and is widely used in automobile shock absorbers Devices, load-bearing wheels of forklifts, rubber rollers for printing and dyeing textiles, squeegee, buffer blocks for bridge construction, entertainment and leisure, military industry, etc.

[0028] Toluene diisocyanate (TDI) is widely used in the production of high-resilience foam. After partial trimerization of TDI, a TDI trimer solution with an isocyanurate six-membered ring structure is obtained, which has very good thermal stability. Its thermal decomposition tempe...

Embodiment 2

[0039] The formula of component A is as follows:

[0040]

[0041]

[0042] The formula of component B is as follows:

[0043]

[0044] Synthesis process of component A: add hydroxyl-terminated polybutadiene, polyether 220, and acetyl tributyl citrate into the reaction kettle, stir and heat up to 110°C, then keep warm and vacuumize for 1 hour, cool down to 70°C after the moisture is less than 0.02%, and Add TDI prepolymer and NDI prepolymer, stir and heat up to 70°C for 3 hours, cool down and pack.

[0045] Synthesis process of component B: Add 4,4′-bis-sec-butylaminodiphenylmethane and ammonium polyacrylate into the reaction kettle, heat up to 60°C, stir for 0.5h, add activated carbon in batches, heat up to 100°C and vacuumize 2h, then lower the temperature to 70°C, add dibutyltin dilaurate and the remaining additives, stir for 1h, cool down and pack.

Embodiment 3

[0047] The formula of component A is as follows:

[0048]

[0049] The formula of component B is as follows:

[0050]

[0051] 0.8 parts of 2,4-diaryl-6-[2-hydroxy-4-(piperidinyloxycarbonylmethoxy)phenyl]-1,3,5-triazine;

[0052] 0.5 parts of isopropyl titanate;

[0053] A-151 3 parts.

[0054] Synthesis process of component A: Add hydroxyl-terminated polybutadiene, polyether 220 and dibutyl phthalate into the reaction kettle, stir and heat up to 110°C, then keep warm and vacuumize for 1 hour, and cool down to 70°C after the moisture is less than 0.02%. Add TDI prepolymer and NDI prepolymer, stir and heat up to 70°C for 3 hours, cool down and pack.

[0055] Synthesis process of component B: Add dipropylene glycol and styrene-maleic anhydride copolymer into the reaction kettle, raise the temperature to 60°C, stir for 0.5h, add vermiculite in batches, heat up to 100°C and vacuumize for 2h, then cool down to 70°C, add isopropyl titanate and the remaining additives, stir...

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Abstract

The invention relates to a polyurethane sealant. The polyurethane sealant comprises a component A and a component B, wherein the component A adopts a formula as follows: 20-30 parts of a TDI prepolymer, 30-50 parts of an NDI prepolymer, 20-30 parts of hydroxyl-terminated polybutadiene, 60-90 parts of polyether 220 and 10-20 parts of a plasticizer; the component B adopts a formula as follows: 30-50parts of a filler, 10-20 parts of a chain extender, 1-3 parts of a dispersant, 2-5 parts of a heat stabilizer, 0.5-1 part of a light stabilizer, 0.2-0.5 part of a catalyst and 1-3 parts of A-151. Inthe polyurethane sealant, the polyether 220 and the hydroxyl-terminated polybutadiene form a soft segment to improve the elasticity of the sealant; the small molecular chain extender is added and reacts with the TDI prepolymer and the NDI prepolymer to produce an oligomer of carbamate, so that the hardness is achieved, the initial decomposition temperature is increased, and the heat stability of the polyurethane sealant is improved; the polyurethane sealant has the advantages of good water resistance, long service life and high strength.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a polyurethane sealant. Background technique [0002] Polyurethane (PU) is one of the six major synthetic materials in the world. PU materials and their products have been widely used in all aspects of the national economy. Polyurethane Adhesive refers to an adhesive containing carbamate groups (-NHCOO-) and / or isocyanate groups (-NCO) in the molecular chain. It has excellent performance and a wide range of applications, and its diversity has a solution for almost every bonding problem. The sealant made of polyurethane not only has the advantages of good elasticity, low temperature resistance, wear resistance, and good adhesion to the substrate interface, but also has the characteristics of a wide range of raw materials, various formulas, and convenient operation. After nearly a century of development, polyurethane has been called the three major sealants together with polysu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C08G18/79C08G18/66C08G18/48C08G18/69C08G18/12
CPCC08G18/12C08G18/48C08G18/698C08G18/79C08G18/794C08K2003/2241C08L2201/08C09J11/04C09J11/06C09J175/08C08G18/3206C08L33/02C08K13/04C08K5/5425C08K3/22C08K7/28C08K13/02C08K5/1345C08K3/04C08K3/346C08K5/34926
Inventor 邵亚陈伟
Owner 苏州炽蓝生物科技有限公司
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