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

Method for modifying natural latex by aqueous polyurethane

A water-based polyurethane and natural latex technology, which is applied in the chemical industry to achieve the effect of smooth and smooth surface and reduced escape concentration

Inactive Publication Date: 2013-03-20
QINGDAO WINCHANCE TECH
View PDF1 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural latex products still have some performance defects, for example, natural latex products have poor compactness, aging resistance, and antibacterial properties.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepolymer is prepared with isophorone diisocyanate (IPDI), polytetrahydrofuran glycol (PTMG), 1,4-butanediol (BDO), and dimethylolpropionic acid (DMPA) as raw materials. The ratio is as follows: the molar ratio of IPDI to PTMG, DMPA, and BDO is 1.2:1, BDO accounts for 2% of the prepolymer mass, and DMPA accounts for 5% of the prepolymer mass. The temperature was lowered to 40°C, and triethylamine was added for neutralization reaction to form a salt, in which the amount of triethylamine was the same as that of DMPA, and the reaction was carried out for 4 minutes. Water is added for emulsification for 60 minutes to obtain a water-based polyurethane emulsion, and water-based polyurethane with polytetrahydrofuran as the soft segment is physically blended with natural latex to obtain a water-based polyurethane modified natural latex.

Embodiment 2

[0019] Prepolymer is prepared with isophorone diisocyanate (IPDI), polytetrahydrofuran glycol (PTMG), 1,4-butanediol (BDO), and dimethylolpropionic acid (DMPA) as raw materials. The ratio is: the molar ratio of IPDI to PTMG, DMPA, and BDO is 1.3:1, BDO accounts for 2% of the mass of the prepolymer, and DMPA accounts for 4% of the mass of the prepolymer. The temperature was lowered to 40°C, and triethylamine was added for neutralization reaction to form a salt, in which the amount of triethylamine was the same as that of DMPA, and the reaction was carried out for 4 minutes. Water is added for emulsification for 60 minutes to obtain a water-based polyurethane emulsion, and water-based polyurethane with polytetrahydrofuran as the soft segment is physically blended with natural latex to obtain a water-based polyurethane modified natural latex.

Embodiment 3

[0021] Prepolymer is prepared with isophorone diisocyanate (IPDI), polytetrahydrofuran glycol (PTMG), 1,4-butanediol (BDO), and dimethylolpropionic acid (DMPA) as raw materials. The ratio is: the molar ratio of IPDI to PTMG, DMPA, and BDO is 1.4:1, BDO accounts for 3% of the mass of the prepolymer, and DMPA accounts for 5% of the mass of the prepolymer. The temperature was lowered to 40°C, and triethylamine was added for neutralization reaction to form a salt, in which the amount of triethylamine was the same as that of DMPA, and the reaction was carried out for 4 minutes. Water is added for emulsification for 60 minutes to obtain a water-based polyurethane emulsion, and water-based polyurethane with polytetrahydrofuran as the soft segment is physically blended with natural latex to obtain a water-based polyurethane modified natural latex.

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

A method for modifying natural latex by aqueous polyurethane includes the steps of: preparing a prepolymer from raw materials of IPDI, PTMG, BDO, and DMPA, adding HEA to block the -NCO end of the prepolymer, reacting for 50 min, cooling to 40 DEG C, adding triethylamine for a neutralization reaction to form a salt, reacting for 3-4 min, adding water to emulsify for 60 min to obtain an aqueous polyurethane emulsion, and physically blending the aqueous polyurethane with natural latex to obtain the aqueous polyurethane-modified natural latex. The aqueous polyurethane-modified natural latex of the present invention can improve smoothness, compactness and mechanical strength of natural latex film, and reduce the escape of allergenic proteins at the same time.

Description

technical field [0001] The invention relates to a method for modifying natural latex by water-based polyurethane, which belongs to the field of chemical industry. technical background [0002] Natural latex is a natural and renewable water-based dispersion system. Rubber products made of natural latex have excellent comprehensive properties and irreplaceability, and have been widely used in medical and health fields, such as medical catheters, gloves and condoms. However, natural latex products still have some performance defects, for example, natural latex products have poor compactness, aging resistance, and antibacterial properties. What's more serious is that latex contains some allergenic proteins, which can easily induce immediate allergic reactions such as contact dermatitis, urticaria, and allergic asthma. In severe cases, it can cause anaphylactic shock and even death. [0003] Water-based polyurethane uses water as a solvent, which has the advantages of no pollut...

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): C08L7/02C08L75/08C08G18/75C08G18/66C08G18/48
Inventor 苏建丽
Owner QINGDAO WINCHANCE TECH
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