Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Polyurethane sealant

A polyurethane sealant and isocyanate-terminated technology, used in the field of sealants, can solve the problems of increased modulus of the sealant, environmental pollution, low volatility, etc., and achieve the effects of prolonging service life, high purity, and avoiding pollution

Inactive Publication Date: 2021-06-01
吴超群
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chlorinated paraffin is a chlorinated derivative of paraffin. It has the advantages of low volatility, flame retardancy, good barrier property, and low price. It can be used as additives such as plasticizers and flame retardants. It has been widely used in sealants , but as the use time prolongs, the chlorinated paraffin is easy to migrate out of the polymer network, which will not only increase the modulus of the sealant, but also cause environmental pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polyurethane sealant
  • Polyurethane sealant
  • Polyurethane sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of carboxyl-containing chlorinated paraffin 42: Dissolve 20 g of chlorinated paraffin 42 in 210 mL of acetone, stir to dissolve, add 20 g of p-hydroxybenzoic acid and 28 g of potassium carbonate, and react at 55° C. for 30 h under nitrogen protection. After the reaction, the pH was adjusted to 3.0 with hydrochloric acid, and then extracted with ethanol, and the product was vacuum-dried at 100° C. for 5 h to obtain carboxyl-containing chlorinated paraffin 42.

[0027] (2) Preparation of chlorinated paraffin 42 containing acid chloride: add 70mol carboxyl-containing chlorinated paraffin 42 to the reaction kettle, add dropwise 85mol phosphorus trichloride, stir and heat up to 70°C, react for 4h, cool to room temperature, and stand to separate Layer to obtain chlorinated paraffin 42 containing acid chloride.

[0028] (3) Preparation of chlorinated paraffin 42 modified diamine: add 100mol anhydrous dichloromethane, 50mol tetrakis(4-aminophenyl)methane and an ...

Embodiment 2

[0030] (1) Preparation of carboxyl-containing chlorinated paraffin 52: Dissolve 20 g of chlorinated paraffin 52 in 220 mL of acetone, stir to dissolve, add 20 g of p-hydroxybenzoic acid and 29 g of potassium carbonate, and react at 80° C. for 10 h under nitrogen protection. After the reaction, the pH was adjusted to 3.0 with hydrochloric acid, and then extracted with ethanol. The product was vacuum-dried at 100° C. for 5 h to obtain carboxyl-containing chlorinated paraffin 52.

[0031] (2) Preparation of chlorinated paraffin 52 containing acid chloride: add 70 mol of chlorinated paraffin 52 containing carboxyl to the reaction kettle, dropwise add 85 mol of phosphorus trichloride, stir and heat up to 50°C, react for 6 hours, cool to room temperature, let stand to separate layer to obtain the chlorinated paraffin 52 containing the acid chloride.

[0032] (3) Preparation of chlorinated paraffin 52 modified diamine: add 100mol anhydrous dichloromethane, 50mol tetrakis(4-aminopheny...

Embodiment 3

[0034] (1) Preparation of carboxyl-containing chlorinated paraffin 70: Dissolve 20 g of chlorinated paraffin 70 in 200 mL of acetone, stir to dissolve, add 20 g of p-hydroxybenzoic acid and 30 g of potassium carbonate, and react at 65° C. for 24 h under nitrogen protection. After the reaction, the pH was adjusted to 3.0 with hydrochloric acid, and then extracted with ethanol, and the product was vacuum-dried at 100°C for 5 hours to obtain carboxyl-containing chlorinated paraffin 70.

[0035] (2) Preparation of chlorinated paraffin 70 containing acid chloride: add 70mol carboxyl-containing chlorinated paraffin 70 to the reaction kettle, add dropwise 85mol phosphorus trichloride, stir and heat up to 60°C, react for 5h, cool to room temperature, and stand to separate layer to obtain chlorinated paraffin 70 containing acid chloride.

[0036] (3) Preparation of chlorinated paraffin 70 modified diamine: add 100mol anhydrous dichloromethane, 50mol tetrakis(4-aminophenyl)methane and a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a polyurethane sealant. The polyurethane sealant comprises a chlorinated paraffin modified diamine curing agent. A preparation method of the chlorinated paraffin modified diamine curing agent comprises the following steps of: reacting chlorinated paraffin with p-hydroxybenzoic acid to prepare carboxyl-containing chlorinated paraffin, acylating the carboxyl-containing chlorinated paraffin, and carrying out amidation reaction on the acylated carboxyl-containing chlorinated paraffin and tetra (4-aminophenyl) methane to obtain the chlorinated paraffin modified diamine curing agent. The preparation method is simple to operate, wide in raw material source and mild in reaction condition, industrial production is met, and the prepared polyurethane sealant has good mechanical property and a wide application prospect.

Description

technical field [0001] The invention relates to a polyurethane sealant, which belongs to the technical field of sealants. Background technique [0002] Sealant refers to a sealing material that deforms with the shape of the sealing surface, is not easy to flow, and has a certain degree of adhesion. It is widely used in the sealing of construction, transportation, electronic instruments and parts. Elastic polyurethane is a commonly used sealing material, which has technical characteristics such as large elongation, high elasticity, and strong adhesion to materials. When the sealant is used in the engineering field, if the tensile modulus of the sealant is too high, it is easy to cause the sealant to peel off or damage the joint surface. When the sealant is used in a low temperature environment for a long time, a smaller modulus is required. In order to obtain Smaller modulus, a large amount of plasticizer is usually added to polyurethane sealant. [0003] Chlorinated paraf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C08G18/32
CPCC08G18/3825C08K2003/222C08K2003/265C09J11/04C09J175/08C08K3/34C08K3/22C08K3/26
Inventor 吴超群
Owner 吴超群
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com