Water-based formaldehyde-free adhesive as well as preparation method and application thereof

An adhesive and water-based technology, applied in the field of polymers, can solve the problems of short operation time, short pre-curing time, poor initial viscosity, etc., and achieve the effects of increased equipment investment, good initial viscosity, and long active cycle

Inactive Publication Date: 2021-10-12
广东木森态新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the strength of this type reaches the standard, the operation time is short, and it is difficult for the factory to complete all the operation procedures within the scheduled time, and it will be very difficult to clean the rubber roller
CN201810928064.6 patent document discloses that the emulsion obtained by the polymerization of alkali lignin and ethyl acetate monomer is added to the emulsion of acrylic polymer and nano-mica powder or nano-talc powder to form a formaldehyde-free adhesive technology, but there are poor initial viscosity, Defects such as high cost, short pre-curing time and poor stability
It can be seen from the above that in the process of preparing formaldehyde-free adhesives for wood-based panels at home and abroad, compounds containing water-reactive compounds such as isocyanate are usually used for doping and strengthening. Due to its extremely high active group -NCO, the water-reactive compound can react quickly with water molecules, greatly reducing the reactivity of isocyanate in glue or causing glue gel phenomenon, and at the same time, the adhesive performance of glue is reduced or glued Common problems such as rubber rollers and metal mechanical equipment
These defects make it difficult to carry out normal operations in the actual industrial production process, and it is difficult to adapt to the technical requirements of existing industrial production

Method used

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  • Water-based formaldehyde-free adhesive as well as preparation method and application thereof
  • Water-based formaldehyde-free adhesive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The preparation method of water-based formaldehyde-free adhesive described in the present embodiment comprises the steps:

[0053] (1) Dissolving polyvinyl alcohol in water at 100°C to obtain a high polymer solution, the mass concentration of the high polymer in the high polymer solution is 40%;

[0054] (2) Lower the temperature to 80°C, add sodium acetate to the polymer solution, adjust the pH value to 7, and stir the reaction for 10 hours under the conditions of nitrogen atmosphere, pressure 10MPa, and temperature 80°C to obtain a hydrogel glue;

[0055] (3) In a nitrogen atmosphere, under the conditions of a pressure of 8MPa and a temperature of 80°C, add vinyl acetate / acrylate copolymer emulsion and disodium lauryl sulfosuccinate monoester into the hydrogel, and then , React for 8 hours at a temperature of 0°C, adjust the pH value to 7 to form an emulsion / composite water-colloid system;

[0056] (4) After adding 1,6-hexamethylene diisocyanate and polyvinyl chlori...

Embodiment 2

[0063] The preparation method of water-based formaldehyde-free adhesive described in the present embodiment comprises the steps:

[0064] (1) Dissolving carboxymethyl cellulose in water at 50°C to obtain a polymer solution, the mass concentration of the polymer in the polymer solution is 30%;

[0065] (2) Lower the temperature to 20°C, add sodium silicate to the polymer solution, adjust the pH value to 2, and stir the reaction for 72 hours under the conditions of nitrogen atmosphere, pressure of -1MPa, and temperature of 0°C to obtain Hydrogel-like;

[0066] (3) In a nitrogen atmosphere, under the conditions of a pressure of 1 MPa and a temperature of 0 ° C, polyvinyl acetate emulsion and potassium monododecyl phosphate were added to the hydrogel, and then the pressure was 1 MPa, the temperature was 80 React for 12 hours under the condition of ℃, adjust the pH value to 12 to form an emulsion / composite water-colloid system;

[0067] (4) Add a water-soluble isocyanate adhesive...

Embodiment 3

[0074] The preparation method of water-based formaldehyde-free adhesive described in the present embodiment comprises the steps:

[0075] (1) Dissolving carboxymethyl cellulose in water at 200°C to obtain a polymer solution, the mass concentration of the polymer in the polymer solution is 0.1%;

[0076] (2) Adjust the temperature to 200°C, add sodium silicate to the polymer solution, adjust the pH value to 2, and stir the reaction for 0.1min under the conditions of nitrogen atmosphere, pressure 10MPa, and temperature 170°C to obtain the Hydrogels;

[0077] (3) In a nitrogen atmosphere, under the conditions of a pressure of -10MPa and a temperature of 250°C, add polyvinyl acetate emulsion and potassium monododecyl phosphate into the hydrogel, and then React at 200°C for 12 hours, adjust the pH value to 12 to form an emulsion / composite water-colloid system;

[0078] (4) Add a water-soluble isocyanate adhesive to the emulsion / composite water-gel system to adjust the pH value to...

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Abstract

The invention discloses a water-based formaldehyde-free adhesive as well as a preparation method and application thereof. The method comprises the following steps: (1) dissolving a water-soluble poly-multistructure compound in water at 0-200 DEG C to obtain a high polymer solution; (2) adjusting the temperature to 0-200 DEG C, adding an active auxiliary agent into the high polymer solution, adjusting the pH value to 2-10, and carrying out a stirring reaction for 1.0-72 h to obtain a hydrogel-like material; (3) reacting the hydrogel-like gel with an emulsion and a surfactant to form an emulsion/composite hydrogel system; and (4) adding a reinforcing material into the emulsion/composite hydrogel system to adjust the pH value to 2-11, and reacting to obtain the water-based formaldehyde-free adhesive. According to the invention, a water molecule, emulsion and hydrogel-like co-embedded film structure is constructed, so that the problem that a water reactive compound and a water-based compound are difficult to coexist is solved. Moreover, the prepared water-based formaldehyde-free adhesive has the effects of high stability, long activity period, toughening, water resistance, high adhesion and no formaldehyde release, and is suitable for artificial boards.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a water-based formaldehyde-free adhesive and a preparation method and application thereof. Background technique [0002] Wood adhesive is the key core technology of wood-based panel industry. For a long time, the adhesives of wood-based panels produced in my country are still mainly "trialdehyde glue", which will volatilize harmful gas "free formaldehyde" in the process of production and use, resulting in the current low-grade wood-based panel products in my country, which are harmful to the living environment. The hidden dangers of poisoning are great, such as the leukemia baby incident. The traditional urea-formaldehyde resin, phenolic resin and melamine three aldehyde resin adhesives still occupy the vast majority of the wood and wood-based panel market in my country because of their low price, simple manufacturing process, and ease of use. However, high-performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J129/04C09J131/04C09J101/28C09J103/02C09J133/04C09J109/08C09J11/08C09J11/06C09J11/04B27D1/04B27D1/08B27G11/00
CPCC09J129/04C09J101/286C09J103/02C09J101/284C09J11/06C09J11/08C09J11/04B27D1/04B27D1/08B27G11/00C08L31/04C08L27/06C08K5/098C08K5/29C08K3/34C08L43/04C08K3/16C08L9/08C08L11/00
Inventor 刘德桃胡睿沈仁杰
Owner 广东木森态新材料科技有限公司
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