Preparation method of modified polyurethane sealant

A polyurethane sealant and modification technology, which is applied in polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve problems such as low tensile strength and high viscosity of sealants, and achieve improved alkali resistance , excellent sealing performance, simple and easy-to-control preparation method

Inactive Publication Date: 2021-02-19
杭州鹿扬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sealant does not contain heavy metal catalysts, is high temperature resistant, non-toxic and environmentally friendly, and has good elasticity and bonding performance; however, due to the addition of a large amount of inorganic fillers in the obtained sealant, the viscosity of the sealant is relatively high, although the mechanical properties of the sealant are reinforced by adding fillers. performance, but the single polyether raw material makes its tensile strength still small

Method used

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  • Preparation method of modified polyurethane sealant
  • Preparation method of modified polyurethane sealant
  • Preparation method of modified polyurethane sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1: A kind of fluorine-containing silane coupling agent:

[0076] Under nitrogen, add 60mL tetrahydrofuran to 0.1mol trifluoropropylmethylcyclotrisiloxane (46.8g), inject a n-hexane solution containing 0.1mol n-butyllithium (5.0g) with a syringe after ice-water bath, and react for 2h Then inject 0.1mol methylphenylchlorosilane (15.6g) into a syringe to end-cap for 12h; wash the product with n-hexane after the reaction, separate the organic phase, wash with deionized water for 3 times, and dry with anhydrous sodium sulfate for 5h. The solvent and unreacted monomers were removed by pressure distillation to obtain 60.91 g of hydrosilane, with a yield of about 94.29%; under nitrogen, 0.31 mol of vinyltrimethoxysilane (45.9 g) was added to 100 g of toluene, and then 0.0071 mmol of Karstedt catalyst was added , 4°C / min to raise the temperature to 82°C, add hydrosilane dropwise into the mixed solution very slowly, the dropwise addition is completed in 6 hours, and re...

Embodiment 2

[0078] Embodiment 2: Another fluorine-containing silane coupling agent:

[0079] This example provides another fluorine-containing silane coupling agent according to the method described in Example 1. The only difference from Example 1 is that the hydrosilane is added dropwise within 1 hour to obtain the final product fluorine-containing silane coupling agent. The joint agent is 50.72g, and the yield is about 65.03%.

Embodiment 3

[0080] Embodiment 3: Another fluorine-containing silane coupling agent:

[0081] This example provides another fluorine-containing silane coupling agent according to the method described in Example 1. The difference from Example 1 is that the hydrosilane is added dropwise within 3 hours to obtain the final product fluorine-containing silane coupling agent. The joint agent is 61.22g, and the yield is about 78.49%.

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Abstract

The invention relates to the technical field of polyurethane sealants, in particular to a preparation method of a modified polyurethane sealant, which comprises the following steps of: reacting polyether polyol with polyisocyanate, a first catalyst and a first plasticizer until the NCO% reaches 3-5%, adding a fluorine-containing silane coupling agent, and terminating to obtain a polyurethane prepolymer; and fully mixing the polyurethane prepolymer, a second plasticizer, a filler, a water removal agent, an antioxidant and a second catalyst under a vacuum condition to obtain the single-componentmodified polyurethane sealant. The poor corrosion resistance of the traditional polyurethane sealant is overcome, and the modified polyurethane sealant with excellent corrosion resistance, especiallyalkali resistance, is provided.

Description

technical field [0001] The invention relates to the technical field of polyurethane sealants, in particular to a preparation method of modified polyurethane sealants. Background technique [0002] Polyurethane sealant (polyurethane sealant) is a sealant with polyurethane rubber and polyurethane prepolymer as the main component. It is widely used in buildings, squares, and roads as caulking sealing materials, as well as automobile manufacturing, glass installation, electronic filling, Sealing of submarines and rockets, etc. Polyurethane sealant has the following characteristics: excellent wear resistance; low temperature softness; wide range of performance adjustment; high mechanical strength; good adhesion; good elasticity, excellent recovery, suitable for dynamic joints; weather resistance Good, the service life can reach 15-20 years; excellent oil resistance; biological aging resistance; moderate price. However, polyurethane sealants also have some disadvantages, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/83C08G18/48C08G18/69C08G18/12C07F7/18
CPCC07F7/1876C08G18/12C08G18/48C08G18/698C08G18/837C09J175/08
Inventor 不公告发明人
Owner 杭州鹿扬科技有限公司
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