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Preparation method of polyamide-based water-based cross-linking dispersing agent and formaldehyde-free water-based polymer composite adhesive prepared from polyamide-based water-based cross-linking dispersing agent

A composite adhesive and water-based technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of difficulty in uniform spraying of particleboard, large amount of adhesive, and high cost, and achieve Good emulsification and dispersion effect

Active Publication Date: 2021-02-02
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the polymethylene polyphenyl polyisocyanate PMDI adhesive is difficult to spray evenly when preparing particleboard, and utilize polymethylene polyisocyanate PMDI adhesive Phenyl polyisocyanate PMDI adhesive is used in the production of particleboard. The amount of adhesive used in the production of particleboard is too large, which leads to the technical problem of high cost. A preparation method of polyamide-based water-based cross-linking dispersant and an aldehyde-free water-based polymer composite prepared by using it are provided. Adhesive

Method used

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  • Preparation method of polyamide-based water-based cross-linking dispersing agent and formaldehyde-free water-based polymer composite adhesive prepared from polyamide-based water-based cross-linking dispersing agent
  • Preparation method of polyamide-based water-based cross-linking dispersing agent and formaldehyde-free water-based polymer composite adhesive prepared from polyamide-based water-based cross-linking dispersing agent
  • Preparation method of polyamide-based water-based cross-linking dispersing agent and formaldehyde-free water-based polymer composite adhesive prepared from polyamide-based water-based cross-linking dispersing agent

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specific Embodiment approach 1

[0029] Specific embodiment one: the preparation method of polyamide-based water-based crosslinking dispersant in this embodiment is carried out according to the following steps:

[0030] 1. Stir and heat up to T 1 =45-130°C, keep for 30-45 minutes, then continue to heat up to distill water while the system is heating up, until the system does not distill any water or the system temperature reaches 195°C, then keep at 190°C-195°C for 2 hours;

[0031] 2. Stop heating, reduce the system temperature to 120°C, add 125 to 470 parts by weight of water until the temperature of the system drops below 30°C, and the mass concentration of the solids in the system is 30% to 50%;

[0032] 3. Take 100 parts by weight of the product obtained in step 2, add 130 to 250 parts by weight of water, stir evenly, add 5 to 35 parts of epichlorohydrin, and gradually heat up to T during stirring. 2 = 40-90°C, and keep the reaction at this temperature for about 4-8 hours, until the end point viscosity ...

specific Embodiment approach 2

[0034] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the adipic acid / organic dibasic acid anhydride mixture in step 1 is a mixture of adipic acid and organic dibasic acid anhydride in any ratio. Others are the same as the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the organic dibasic anhydride in step 1 is one of maleic anhydride and phthalic anhydride or a mixture of the two in any ratio. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a polyamide-based water-based cross-linking dispersing agent and a formaldehyde-free water-based polymer composite adhesive prepared from the polyamide-based water-based cross-linking dispersing agent. In order to solve the technical problems that the polymethylene polyphenyl polyisocyanate (PMDI) adhesive is difficult to uniformly spray when being used for preparing shaving boards and the cost is high due to large dosage, the dispersing agent is prepared by stirring adipic acid or an adipic acid / organic binary anhydride mixture and a polyamine compound, heating, adding water, adding epoxy chloropropane, heating and reacting. The adhesive is prepared by stirring a polyamide-based aqueous cross-linking dispersant, water and PMDI at room temperature. The method effectively solves the problem of nonuniform spraying of the PMDI adhesive on particle boards and other particle boards, can effectively reduce the PMDI adhesive application amount so as to reduce the adhesive cost of the prepared formaldehyde-free artificial board, has the working life required by the artificial board production process, and is green and environment-friendly. The invention belongs to the technical field of dispersants and adhesives.

Description

technical field [0001] The invention relates to a water-based crosslinking dispersant and a formaldehyde-free adhesive. Background technique [0002] As the largest country in wood-based panel production, consumption and import and export trade, China's wood-based panel production in 2019 was about 308 million cubic meters, of which plywood output reached 180 million cubic meters, fiberboard was 62 million cubic meters, and particleboard was 3,000 cubic meters. However, my country's wood-based panel production is still mainly based on urea-formaldehyde resin adhesives and melamine-modified urea-formaldehyde resin adhesives, which account for more than 90% of wood-based panel adhesives. Urea-formaldehyde resin adhesive is a synthetic resin adhesive synthesized with urea and formaldehyde as the main raw materials. It has excellent bonding performance, process performance and low cost, but it will release free formaldehyde during production, transportation and use. A substance...

Claims

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Application Information

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IPC IPC(8): C08G69/48C08G69/26C08G69/28C08G18/67C09J175/14
CPCC08G69/48C08G69/265C08G69/28C08G18/6705C09J175/14
Inventor 高振华孙宗兴白玉梅顾继友
Owner NORTHEAST FORESTRY UNIVERSITY
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