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

Environment-friendly co-condensed resin wood adhesive with high solid content, and preparation method and application thereof

An environmentally friendly, co-condensation resin technology, applied in the field of polymers, can solve problems such as no public reports, and achieve the effects of reducing production costs, stabilizing the structure, and reducing environmental pollution

Active Publication Date: 2018-01-19
SOUTHWEST FORESTRY UNIVERSITY
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And through literature search, do not see the public report identical with the present invention

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

preparation example Construction

[0020] The preparation method of the environment-friendly co-polycondensation resin wood adhesive with high solid content of the present invention includes raw material preparation, addition reaction, polycondensation reaction and post-processing steps, specifically including:

[0021] A. Raw material preparation: Weigh glyoxal, urea and paraformaldehyde respectively according to the ratio of raw materials for standby;

[0022] B. Addition reaction: Add the weighed glyoxal, urea and paraformaldehyde into the reactor, stir and dissolve, adjust the pH value to 7.0~9.0 with a pH regulator, heat up to 70~90°C, 70~ React at a constant temperature of 90°C for 30-50 minutes to obtain material a;

[0023] C. Polycondensation reaction: then use a pH regulator to adjust the pH value of material a to 4.0~6.0, react at a constant temperature of 70~90°C, and obtain material b for 50~70 minutes;

[0024] D. Post-processing: adjust the pH value of the material b to 7.5~8.5 with a pH regulat...

Embodiment 1

[0031] (The urea, glyoxal, and paraformaldehyde mentioned in the examples are all in moles, and the paraformaldehyde is calculated by the moles of decomposed formaldehyde, and the concentration of the glyoxal aqueous solution is 40%)

[0032] (1) Weigh 2.0 moles of urea, 1.4 moles of glyoxal, and 1.4 moles of paraformaldehyde.

[0033] (2) Add the weighed paraformaldehyde, urea, and 40% glyoxal aqueous solution into the three-necked flask at one time, slowly raise the temperature and stir to dissolve it, then adjust the pH value to weak alkaline (pH 7.0~9.0) ; Then slowly raise the temperature to 70-90 degrees, and keep it warm for 40 minutes in this temperature range.

[0034] (3) Adjust the pH of the reaction mixture obtained in (2) to acidic (pH 4.0-6.0), and keep it warm for 1h.

[0035] (4) Cool, adjust to weak alkaline discharge (pH 7.5~8.5).

Embodiment 2

[0037] (The urea, glyoxal, and paraformaldehyde mentioned in the examples are all in moles, and the paraformaldehyde is calculated by the moles of decomposed formaldehyde, and the concentration of the glyoxal aqueous solution is 40%)

[0038] (1) Weigh 2.0 moles of urea, 1.0 moles of glyoxal, and 1.8 moles of paraformaldehyde.

[0039] (2) Add the weighed paraformaldehyde, urea, and 40% glyoxal aqueous solution into the three-necked flask at one time, slowly raise the temperature and stir to dissolve it, then adjust the pH value to weak alkaline (pH 7.0~9.0) ; Then slowly raise the temperature to 70-90 degrees, and keep it warm for 40 minutes in this temperature range.

[0040] (3) Adjust the pH of the reaction mixture obtained in (2) to acidic (pH 4.0-6.0), and keep it warm for 1h.

[0041](4) Cool, adjust to weak alkaline discharge (pH 7.5~8.5).

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 strengthaaaaaaaaaa
release amountaaaaaaaaaa
Login to View More

Abstract

The invention discloses an environment-friendly co-condensed resin wood adhesive with high solid content, and a preparation method and an application thereof. The environment-friendly co-condensed resin wood adhesive with high solid content contains raw materials such as glyoxal, urea and paraformaldehyde, and is prepared by addition and condensing reactive synthesis; and the molar ratio of glyoxal to urea to paraformaldehyde is (0.5-1.0):1.0:(0.3-0.9). The preparation method comprises the steps of material preparation, addition reaction, condensation polymerization and after-treatment. The application is the application of the environment-friendly co-condensed resin wood adhesive with high solid content in production and / or manufacture of artificial boards, solid wood plywood, clothing and impregnated paper. The environment-friendly co-condensed resin wood adhesive with high solid content prepared according to the invention has the characteristics of being great in viscosity, high insolid content, steady in structure and excellent in performance and having the free formaldehyde content of less than 0.1%, and can be directly used in production without dehydration treatment, thus having a good industrial application prospect and practical application value.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to an environment-friendly co-condensation resin wood adhesive with high solid content and a preparation method and application thereof. Background technique [0002] As the main type of glue used in the wood industry, the application of formaldehyde series resin adhesives has greatly promoted the rapid development of the wood-based panel industry. However, its widespread use has also brought serious social problems such as free formaldehyde polluting the environment and endangering health. Therefore, it is the current trend to choose non-toxic, non-volatile glyoxal to partially or completely replace formaldehyde and react with urea to prepare a new type of amino resin wood adhesive, and to eliminate or reduce the harm of formaldehyde release from wood products to the environment and human health from the source. One of the main directions for the development of ...

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): C09J161/24C08G12/12
Inventor 邓书端李向红杜官本
Owner SOUTHWEST FORESTRY UNIVERSITY
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