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Method for preparing environment-friendly adhesive by aminated graphene modified urea-formaldehyde resin

A technology of aminated graphene and urea-formaldehyde resin, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems such as the decline in the strength and performance of the board, and achieve improved bonding strength and reduced formaldehyde content , The effect of reducing the release of free formaldehyde

Active Publication Date: 2022-03-08
XIAN TECH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The method includes reducing the molar ratio of formaldehyde to urea in the synthesis of urea-formaldehyde resin. Although the reduction of the molar ratio can significantly reduce the release of free formaldehyde, it will also reduce the strength of the board.

Method used

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  • Method for preparing environment-friendly adhesive by aminated graphene modified urea-formaldehyde resin
  • Method for preparing environment-friendly adhesive by aminated graphene modified urea-formaldehyde resin
  • Method for preparing environment-friendly adhesive by aminated graphene modified urea-formaldehyde resin

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Embodiment

[0019] S1. Preparation of graphene oxide: Add 3g of natural graphite and 1.5g of sodium nitrate to 70mL of concentrated H at 2 SO 4 After electric stirring for 40min, slowly add 9gKMnO 4 (add within 1.5h), and keep the temperature below 20°C with an ice-water bath; after 30 minutes of reaction, raise the temperature of the system to 40°C and stir for 30 minutes, slowly add 200mL of distilled water to the system, continue to rise to 98°C and stir for 15 minutes , the system was lowered to room temperature and poured into 400 mL of deionized water, and 30% H 2 o 2 until the solution is golden, let it stand for 12 hours, filter and centrifuge, wash the remaining solid with 5% HCL and distilled water until the pH is 7, and then dry the obtained sample at 70°C to obtain graphite oxide;

[0020] S2. Preparation of aminated graphene: Add 200 mg of graphite oxide into a three-neck flask equipped with 100 mL of DMF, mechanically stir at room temperature for 91 h, then add 36 mL of et...

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Abstract

The invention discloses a method for preparing an environmentally friendly adhesive by aminated graphene-modified urea-formaldehyde resin. The graphene oxide is prepared by the Hummers method, and the surface of the graphene oxide is modified by a grafting method supplemented by an ultrasonic treatment method to prepare an aminated adhesive. Graphene, the synergistic effect of aminated graphene and melamine was introduced in the process of preparing urea-formaldehyde resin to realize the control of free formaldehyde in urea-formaldehyde resin. Aminated graphene was used as a formaldehyde capture agent and polycondensation reaction cross-linking agent at the same time, and an environmentally friendly urea-formaldehyde was prepared Resin adhesive. It provides a new idea and approach for the design, synthesis and modification of urea-formaldehyde resin adhesives with low free formaldehyde content, and has important scientific guiding significance for the further research of urea-formaldehyde resin adhesives.

Description

technical field [0001] The invention relates to the field of urea-formaldehyde resins, in particular to a method for preparing an environment-friendly adhesive by aminated graphene-modified urea-formaldehyde resins. Background technique [0002] Urea-formaldehyde resin adhesive is a thermosetting polymer adhesive discovered earlier. It is generally synthesized by urea and formaldehyde, and then forms an insoluble and infusible cured resin under the action of a curing agent or an auxiliary agent. Urea-formaldehyde resin adhesive is one of the main adhesives in the wood industry due to its advantages of high bonding strength, fast curing speed, simple synthesis process, convenient use, good performance, low cost, and abundant raw material sources. However, in the production process of urea-formaldehyde resin adhesives, in the process of using urea-formaldehyde resin to make plywood, and in the process of decoration and use of wood-based panels, a large amount of free formalde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/38C09J161/32
CPCC08G12/40C08G12/38C09J161/32
Inventor 颜海燕薛秀秀刘玉君王昭
Owner XIAN TECH UNIV
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