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

Preparation of starch-based waterborne polyurethane emulsion and application of starch-based waterborne polyurethane emulsion in packaging paper

A water-based polyurethane and emulsion technology, used in packaging paper, wrapping paper, packaging, etc., can solve the problems of difficult hydration of PU prepolymer, difficulty in obtaining water dispersion, and large particle size of WPU, and achieve film-forming properties. And the effects of improved biodegradability, improved surface water resistance, and fast curing rate

Active Publication Date: 2020-01-07
SHANYING INT HLDG CO LTD +1
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The potential application of the present invention is to obtain the water-based polyurethane emulsion with high solid content, small emulsion particle size, concentrated distribution, and good film-forming performance, which will affect the molecular weight, chemical structure, etc. Higher requirements are put forward. At present, petrochemical-based WPU mostly uses oligomer diols or polyols as raw materials, and the molecular weight is mostly 10. 3 ~10 4 , while the molecular weight of native starch is mostly 10 5 ~10 7 , and often contain both direct chain and branched chain structures. If the PU prepolymer is prepared from native starch and diisocyanate, its molecular weight and chemical structure uniformity are poor. The hydration of the PU prepolymer is extremely difficult, and it is difficult to obtain an aqueous dispersion. Or the performance of WPU large particle size, uneven distribution, poor film-forming properties, etc.

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
  • Preparation of starch-based waterborne polyurethane emulsion and application of starch-based waterborne polyurethane emulsion in packaging paper
  • Preparation of starch-based waterborne polyurethane emulsion and application of starch-based waterborne polyurethane emulsion in packaging paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of embodiment 1 liquefied cornstarch-based aqueous polyurethane emulsion

[0041] (1) Take 56g of waxy polyethylene glycol 2000 and put it in a three-necked flask, and fully melt it at 130°C; take 20g of fully dried cornstarch and add it to polyethylene glycol in three times, and add it while stirring to avoid starch hanging on the wall , until the starch and polyethylene glycol are completely mixed and there are no starch lumps;

[0042] (2) Add 0.82g of 98% concentrated sulfuric acid dropwise in the flask, stir and insulate for 40min, add NaOH to neutralize the material, cool and discharge, the product is a wine red viscous fluid starch polyol liquefaction product, and its hydroxyl value is 265mgKOH / g , the apparent viscosity is 1860mPa.s;

[0043] (3) Put a 500ml four-neck flask in an oil bath, equip with a cantilever electric stirrer, a reflux condenser, and feed nitrogen. Take 54.02 g of the above-mentioned corn starch liquefaction product and put...

Embodiment 2

[0045] The preparation of embodiment 2 liquefied tapioca starch-based waterborne polyurethane

[0046] (1) Take 50g of waxy polyethylene glycol 4000 and put it in a three-necked flask, and fully melt it at 140°C; take 10g of fully dried tapioca starch and add it to the polyethylene glycol, and add it while stirring to avoid starch hanging on the wall until Starch and polyethylene glycol are completely mixed without starch lumps;

[0047] (2) Add 0.5 g of 98% concentrated sulfuric acid dropwise in the flask, add NaOH to neutralize the material after stirring and insulated for 30 min, and cool and discharge. The product is a wine red viscous fluid starch polyol liquefaction product, and its hydroxyl value is 230 mgKOH / g , the apparent viscosity is 1200mPa.s;

[0048] (3) Put a 500ml four-neck flask in an oil bath, equip with a cantilever electric stirrer, a reflux condenser, and feed nitrogen. Take 50.10 g of the above-mentioned tapioca starch liquefaction product and place it...

Embodiment 3

[0050] The preparation of embodiment 3 potato starch-based aqueous polyurethane emulsions

[0051] (1) Take 40g of waxy polyethylene glycol 2000 and place it in a three-necked flask, and fully melt it at 120°C; take 30g of fully dried potato starch and add it to the polyethylene glycol, and add it while stirring to avoid starch hanging on the wall until Starch and polyethylene glycol are completely mixed without starch lumps;

[0052] (2) Add 1.5 g of 98% concentrated sulfuric acid dropwise in the flask, add NaOH to neutralize the material after stirring and insulated for 15 min, and cool and discharge the product. The product is a yellow-brown viscous fluid-like starch polyol liquefaction product, and its hydroxyl value is 406 mgKOH / g , the apparent viscosity is 3200mPa.s;

[0053] (3) Put a 500ml four-neck flask in an oil bath, equip with a cantilever electric stirrer, a reflux condenser, and feed nitrogen. Take 50.16g of the above-mentioned potato starch liquefaction prod...

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

PropertyMeasurementUnit
shear viscosityaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to preparation of a starch-based waterborne polyurethane emulsion and an application of the starch-based waterborne polyurethane emulsion in packaging paper; corn starch and cassava starch are used as raw materials, and the waterborne polyurethane emulsion is prepared through liquefaction, neutralization, prepolymerization, salification and phase transfer processes. The prepared bio-based waterborne polyurethane emulsion is environment-friendly, non-toxic, long in storage life and high in solid content, and the preparation method has the advantages of low production cost,standard process and stable product quality. The prepared bio-based polyurethane emulsion is good in film-forming property, high in adhesiveness and high in curing rate, the mechanical strength, especially the surface water resistance, of the packaging paper is remarkably improved, and the bio-based polyurethane emulsion can be used as a coating for packaging paper and paperboards.

Description

technical field [0001] The invention belongs to the technical field of natural high molecular polymer modification and application, and relates to the preparation technology of water-based polyurethane (WPU) emulsion, especially a method for preparing novel bio-based water-based polyurethane emulsion with starch as raw material and its application in the field of packaging paper . Background technique [0002] The proportion of paper-based packaging materials in all packaging materials is second only to plastics, and it has inherent advantages over plastics in terms of renewable, degradable, and low-carbon recycling. In recent years, with the rapid development of the logistics industry driven by e-commerce, the packaging industry has put forward higher requirements for the quality and quantity of paper-based packaging materials. The development trend of packaging paper is lightweight, high-strength and multi-functional. . [0003] Due to the keratinization and cutting effe...

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): C08G18/66C08G18/10C08G18/48C08G18/64C08G18/65C08G18/34D21H27/10D21H21/16D21H19/14D21H19/24
CPCC08G18/10C08G18/6541C08G18/6692C08G18/4833C08G18/6484D21H27/10D21H21/16D21H19/14D21H19/24C08G18/348
Inventor 陶正毅占正奉刘忠陈学萍
Owner SHANYING INT HLDG CO LTD
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