Low-viscosity thermosetting shaving board starch adhesive and preparation method thereof

A technology of starch adhesives and particleboards, applied in the direction of adhesives, adhesive types, grafted polymer adhesives, etc., can solve problems such as increased viscosity, achieve low self-crosslinking degree, good fluidity, and promote self- The effect of crosslinking

Active Publication Date: 2022-03-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the present invention provides a low-viscosity and good water-resistant thermosetting particleboard starch adhesive and a preparation method thereof. However, the cross-linking monomer that can quickly cross-link during the hot pressing process of the sheet can avoid the problem of viscosity increase during the adhesive reaction process, and the cross-linking monomer undergoes a self-crosslinking reaction during the hot pressing process to form a three-dimensional The network structure improves the water resistance of the adhesive, and the addition of itaconic acid can promote the self-crosslinking reaction of the cross-linking monomer during the hot pressing process, further improving the water resistance of the adhesive

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
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  • Low-viscosity thermosetting shaving board starch adhesive and preparation method thereof
  • Low-viscosity thermosetting shaving board starch adhesive and preparation method thereof
  • Low-viscosity thermosetting shaving board starch adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Formula (mass / g):

[0048]

[0049] Process flow:

[0050] (1) Starch and water are made into starch milk with a mass ratio of 35% on a dry basis of starch, and stirred evenly;

[0051] (2) Adjust the temperature of the starch milk to 60°C at a rate of 2°C / min, dilute 10g of 12mol / L concentrated hydrochloric acid solution to 0.6mol / L, add it to the starch milk for acid hydrolysis, acid hydrolysis for 2 hours, and then add 10mol / L L sodium hydroxide solution to adjust the pH to 4; adjust the temperature of the acid-hydrolyzed starch milk to 85°C at a rate of 1°C / min, and keep the reaction temperature at 85°C after pregelatinization for 30 minutes;

[0052] (3) get 0.61g initiator and be dissolved in 35g water and make initiator solution, get 1.3g emulsifier and dissolve in 24.8g water and make 5% emulsifier solution, get 5g graft monomer itaconic acid and dissolve in 45g water Make solution, get 15g cross-linking monomer N-hydroxyethyl acrylamide and dissolve in the...

Embodiment 2

[0059] Formula (mass / g):

[0060]

[0061] Process flow:

[0062] (1) Starch and water are made into starch milk with a mass ratio of 35% on a dry basis of starch, and stirred evenly;

[0063] (2) Adjust the temperature of the starch milk to 60°C at a rate of 2°C / min, keep it warm for 2 hours, then add 10mol / L concentrated hydrochloric acid solution to adjust the pH to 4; adjust the temperature of the starch milk to 85°C at a rate of 1°C / min , after pregelatinization for 30min, the reaction temperature was kept at 85°C;

[0064] (3) Get 0.61g initiator and dissolve in 35g water to make initiator solution, get 1.3g emulsifier and dissolve in 24.8g water to make 5% emulsifier solution, get 5g graft monomer itaconic acid and dissolve it in 45g water to make Become a solution, get 15g cross-linking monomer N-hydroxyethylacrylamide and dissolve in the grafting monomer solution;

[0065] (4) The initiator and emulsifier solution prepared in step (3) are directly added to the r...

Embodiment 3

[0072] Formula (mass / g):

[0073]

[0074] Process flow:

[0075] (1) Starch and water are made into starch milk with a mass ratio of 35% on a dry basis of starch, and stirred evenly;

[0076] (2) Adjust the temperature of the starch milk to 60°C at a rate of 2°C / min, dilute 10g of 12mol / L concentrated hydrochloric acid solution to 0.6mol / L, add it to the starch milk for acid hydrolysis, acid hydrolysis for 2 hours, and then add 10mol / L L sodium hydroxide solution to adjust the pH to 4; adjust the temperature of the acid-hydrolyzed starch milk to 85°C at a rate of 1°C / min, and keep the reaction temperature at 85°C after pregelatinization for 30 minutes;

[0077] (3) get 0.61g initiator and be dissolved in 35g water and make initiator solution, get 1.3g emulsifier and dissolve in 24.8g water and make 5% emulsifier solution, get 5g graft monomer itaconic acid and dissolve in 45g water Make a solution, get 15g cross-linking monomer N-methylolacrylamide and dissolve it in the...

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
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PUM

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Abstract

The invention discloses a low-viscosity thermosetting shaving board starch adhesive and a preparation method thereof, and belongs to the technical field of adhesive preparation. A crosslinking monomer, namely N-hydroxyethyl acrylamide or acetoxyethyl methacrylate, which is low in crosslinking degree in an adhesive preparation process and can be quickly crosslinked in a plate hot pressing process is selected, so that the problem that the viscosity is increased in an adhesive reaction process is avoided; and the crosslinking monomer is subjected to a self-crosslinking reaction in the hot pressing process to form a three-dimensional network structure, so that the water resistance of the adhesive is improved, and meanwhile, the itaconic acid is added to promote the self-crosslinking reaction of the crosslinking monomer in the hot pressing process, so that the water resistance of the adhesive is further improved. Various properties of the manufactured shaving board reach the standard of P2 type shaving boards, and meanwhile, various properties of the manufactured plywood exceed the standard of II type plywood, so that the adhesive can be suitable for mass production and can be widely applied to bonding of hot-pressed wood decoration, shaving boards, plywood and fiberboards.

Description

technical field [0001] The invention relates to a low-viscosity thermosetting particleboard starch adhesive and a preparation method thereof, belonging to the technical field of adhesive preparation. Background technique [0002] my country's forest resources are scarce, and there is a big contradiction between the supply and demand of wood. The current situation of insufficient supply of raw materials in the wood industry has always restricted the development of my country's wood-based panel industry. Comprehensive utilization of wood. At present, most of the wood-based panels on the market are produced by hot pressing process, using the adhesive "trialdehyde glue" with thermosetting properties - urea-formaldehyde resin (UF), phenolic resin (PF) and melamine-formaldehyde resin (MF), but the above-mentioned Adhesive raw materials are non-renewable, and a large amount of formaldehyde is released during production and use, causing environmental pollution and endangering public...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C08F251/00C08F222/02C08F220/58
CPCC09J151/02C08F251/00C08F222/02C08F220/58
Inventor 程力金俊男顾正彪李兆丰洪雁李才明班宵逢
Owner JIANGNAN UNIV
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