A kind of cationic aqueous polyurethane emulsion and its preparation method and application

A water-based polyurethane and cationic technology, which is applied in the field of papermaking, can solve the problems of inability to use additives and limit applications, and achieve the effects of improving surface strength, adjusting surface porosity, tearing degree and folding resistance

Active Publication Date: 2022-04-29
ZHEJIANG HENGDA NEW MATERIAL CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that it is insoluble in water, and solvents need to be added in the application, which limits its application, and it cannot be used for adding in slurry

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
  • A kind of cationic aqueous polyurethane emulsion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of preparation method of cationic water-based polyurethane emulsion of the present embodiment, described method specifically comprises the steps:

[0048] Step (1): First, pretreat the raw materials: refrigerate toluene-2,4-diisocyanate (TDI) in an environment < 4°C for later use; dehydrate tetrahydrofuran (THF) with molecular sieves for later use; prepare polyethylene glycol 200 (PEG-200) was vacuum dehydrated at 70°C and 0.08MPa for 12 hours, then placed in a desiccator for later use;

[0049] Step (2): Solution preparation: 50g (0.287mol) of TDI pretreated in step (1) was added to 167g of THF, and mixed to obtain a THF solution of TDI; and 14.4g (0.072mol) of step (1) After pretreatment, PEG-200 was added to 48g THF, and mixed to obtain a THF solution of PEG-200; wherein: in the THF solution of TDI, the concentration of TDI was 30wt%; in the THF solution of PEG-200, The concentration of PEG-200 is 30wt%;

[0050] Step (3): Add the THF solution of TDI that st...

Embodiment 2

[0055] A kind of preparation method of cationic water-based polyurethane emulsion of the present embodiment, described method specifically comprises the steps:

[0056] Step (1): First, pretreat the raw materials: refrigerate toluene-2,4-diisocyanate (TDI) in an environment <4°C for later use; dehydrate tetrahydrofuran (THF) with molecular sieves for later use; prepare polyethylene glycol 400 (PEG-400) was vacuum dehydrated at 70°C and 0.08MPa for 12 hours, then placed in a desiccator for later use;

[0057] Step (2): Solution preparation: 50g (0.287mol) of TDI pretreated in step (1) was added to 100g of THF, and mixed to obtain a THF solution of TDI; and 28.8g (0.072mol) of step (1) After pretreatment, PEG-400 was added to 57.6g THF, and mixed to obtain a THF solution of PEG-400; wherein: in the THF solution of TDI, the concentration of TDI was 50wt%; in the THF solution of PEG-400, The concentration of PEG-400 is 50wt%;

[0058] Step (3): Add the THF solution of TDI that s...

Embodiment 3

[0062] A kind of preparation method of cationic water-based polyurethane emulsion of the present embodiment, described method specifically comprises the steps:

[0063] Step (1): First, pretreat the raw materials: refrigerate toluene-2,4-diisocyanate (TDI) in an environment <4°C for later use; dehydrate tetrahydrofuran (THF) with molecular sieves for later use; prepare polyethylene glycol 800 (PEG-800) was vacuum dehydrated at 70°C and 0.08MPa for 12 hours, and then placed in a desiccator for later use;

[0064] Step (2): Solution preparation: 50g (0.287mol) TDI after step (1) pretreatment is added in 83.3g THF, mix, obtain the THF solution of TDI; And 57.6g (0.072mol) step (1) ) After pretreatment, PEG-800 was added to 96gTHF, and mixed to obtain a THF solution of PEG-800; wherein: in the THF solution of TDI, the concentration of TDI was 60wt%; in the THF solution of PEG-800, The concentration of PEG-800 is 60wt%;

[0065] Step (3): Add the THF solution of TDI that step (2)...

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
Cobb valueaaaaaaaaaa
Cobb valueaaaaaaaaaa
Cobb valueaaaaaaaaaa
Login to view more

Abstract

The invention discloses a cationic water-based polyurethane emulsion, a preparation method and application thereof, and belongs to the technical field of papermaking. The present invention adopts toluene-2,4-diisocyanate (TDI) as main reaction raw material, polyethylene glycol (PEG-200, 400, 600 or 800) as soft segment, tetrahydrofuran (THF) as solvent, 2,4,6 ‑Tri(dimethylaminomethyl)phenol is an end-capping agent, because 2,4,6‑tri(dimethylaminomethyl)phenol has a positive charge in aqueous solution, so the prepared aqueous polyurethane emulsion is also positively charged. Charge, under the action of charge attraction, can be well retained on the negatively charged paper fibers. In addition, the cationic water-based polyurethane emulsion prepared by the present invention can be used as a paper-making wet-end additive to significantly enhance the paper effect (dry and wet strength, tearing degree and folding resistance are all significantly improved, especially the wet strength), and has a certain Sizing effect. Moreover, this additive can also be used for paper surface coating to improve the surface strength of paper and even adjust the surface porosity.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a non-fibrous material added to pulp, more specifically, the invention relates to a cationic water-based polyurethane emulsion and its preparation method and application, especially in medical packaging paper or Application in high wet strength dialysis functional paper, etc. Background technique [0002] Pulp fibers are highly hydrophilic, and water molecules can participate in extensive hydrogen bonding. When paper is in contact with water, fiber-fiber bonding is replaced by fiber-water bonding. Therefore, after paper and cardboard are soaked in water, their mechanical strength is almost It is completely lost, and generally only maintains 4% to 10% of the dry paper strength. Some special papers such as photographic paper, base paper for printing, military map paper, banknote paper, paper tableware, agricultural paper, medical dialysis paper, etc. not only have ...

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 Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G18/28C08G18/10D21H17/57
CPCC08G18/7614C08G18/4833C08G18/3206C08G18/10D21H17/57C08G18/2805
Inventor 伊财富杨菊红刘巧红徐冰虞玲杜琼仙王启华
Owner ZHEJIANG HENGDA NEW MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap