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A kind of e0 grade melamine modified urea-formaldehyde resin adhesive

A technology of urea-formaldehyde resin glue and melamine, which is applied in the direction of adhesives, adhesive additives, aldehyde/ketone condensation polymer adhesives, etc., which can solve the problems of insufficient board bonding performance, long product production cycle, and high manufacturing costs, etc. problems, to achieve the effect of shortening the hot-pressing cycle, good pre-pressing effect, improving utilization rate and production efficiency

Active Publication Date: 2019-01-25
广州市长安粘胶制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From a technical point of view, my country has developed the production technology of E1 products, but E1 0 The production technology of high-grade products is not very perfect, mainly reflected in the following aspects: a. In order to achieve the purpose of reducing aldehyde, the free urea in the glue is too much, the reaction of melamine is not sufficient, and the bonding performance of the board cannot meet the national and foreign standards; b. The amount of formaldehyde released by the products is unstable, and the amount of formaldehyde released by the same batch of products varies from time to time, resulting in hidden quality risks and trade risks; c. Long product production cycles, low equipment utilization, low production efficiency, and high manufacturing costs, etc. problems that affect the competitiveness of products

Method used

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  • A kind of e0 grade melamine modified urea-formaldehyde resin adhesive
  • A kind of e0 grade melamine modified urea-formaldehyde resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] E of the present invention 0 A kind of embodiment of the preparation method of grade melamine modified urea formaldehyde resin, comprises the following steps:

[0033] (1), adding hexamethylenetetramine, polyvinyl alcohol and water into a formaldehyde solution with a pH of 8.0 to 8.5, and controlling the temperature at 45 to 47°C;

[0034](2) Add the first batch of melamine, control the temperature to 52-54°C, control the pH ≥ 6.5, add the first batch of urea, raise the temperature to 90-94°C, and control the pH to 7.5-7.8;

[0035] (3) Control the temperature to 90-94°C, control the pH ≥ 7.0 until the viscosity is 90-130mPa.s, cool down and quickly add alkali, adjust the pH to 8.5-9.0, add the second batch of melamine, and control the temperature to 85-87 ℃, react until the reaction solution in the kettle turns clear, and check that the pH is 8.0-8.5;

[0036] (4) Add the third batch of melamine, continue the reaction at 82-85°C until the viscosity is 150-180mPa.s, c...

Embodiment 2

[0044] E of the present invention 0 A kind of embodiment of the preparation method of grade melamine modified urea formaldehyde resin, comprises the following steps:

[0045] (1), adding hexamethylenetetramine, polyvinyl alcohol and water into a formaldehyde solution with a pH of 8.0 to 8.5, and controlling the temperature at 45 to 47°C;

[0046] (2) Add the first batch of melamine, control the temperature to 52-54°C, control the pH ≥ 6.5, add the first batch of urea, raise the temperature to 90-94°C, and control the pH to 7.5-7.8;

[0047] (3) Control the temperature to 90-94°C, control the pH ≥ 7.0 until the viscosity is 90-130mPa.s, cool down and quickly add alkali, adjust the pH to 8.5-9.0, add the second batch of melamine, and control the temperature to 85-87 ℃, react until the reaction solution in the kettle turns clear, and check that the pH is 8.0-8.5;

[0048] (4) Add the third batch of melamine, continue the reaction at 82-85°C until the viscosity is 150-180mPa.s, ...

Embodiment 3

[0056] E of the present invention 0 A kind of embodiment of the preparation method of grade melamine modified urea formaldehyde resin, comprises the following steps:

[0057] (1), adding hexamethylenetetramine, polyvinyl alcohol and water into a formaldehyde solution with a pH of 8.0 to 8.5, and controlling the temperature at 45 to 47°C;

[0058] (2) Add the first batch of melamine, control the temperature to 52-54°C, control the pH ≥ 6.5, add the first batch of urea, raise the temperature to 90-94°C, and control the pH to 7.5-7.8;

[0059] (3) Control the temperature to 90-94°C, control the pH ≥ 7.0 until the viscosity is 90-130mPa.s, cool down and quickly add alkali, adjust the pH to 8.5-9.0, add the second batch of melamine, and control the temperature to 85-87 ℃, react until the reaction solution in the kettle turns clear, and check that the pH is 8.0-8.5;

[0060] (4) Add the third batch of melamine, continue the reaction at 82-85°C until the viscosity is 150-180mPa.s, ...

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Abstract

The invention discloses a preparation method of E0-level melamine modified urea formaldehyde resin. The E0-level melamine modified urea formaldehyde resin is prepared by the following steps of feeding urea by three batches, and feeding melamine by three batches. The invention also discloses the E0-level melamine modified urea formaldehyde resin and an E0-level melamine modified urea formaldehyde resin adhesive. The method has the advantages that the distribution of the internal molecular structure of the urea formaldehyde resin is changed by the multi-batch feeding type, the prepared resin is added into an adhesive mixer, a formaldehyde removing agent, a reinforcing agent, an acid curing agent and industrial flour are stirred until all the components are uniformly mixed, so as to obtain a mixed adhesive, and the obtained mixed adhesive is applied into the production of parquets; the hot pressing cycle can be shortened, the hot pressing time is shortened from conventional 70-79s / mm to 30-35s / mm under the condition of no change of pressure and temperature parameters, and the utilization rate and production efficiency of a hot press are greatly improved; the release amount of formaldehyde in the prepared plate reaches superE0 level.

Description

technical field [0001] The invention relates to an adhesive, in particular to an E 0 Grade melamine modified urea-formaldehyde resin adhesive. Background technique [0002] Since entering the 21st century, my country's wood-based panel industry has developed rapidly, and it is the largest country in the world's wood-based panel production, consumption and import and export trade. In 2015, the total output of my country's wood-based panels reached 287 million cubic meters, ranking first in the world for many years in a row, of which the output of plywood reached 165.5 million cubic meters, especially the plywood for solid wood composite flooring is also a sudden rise, in the domestic decoration market and export Has a gratifying performance. Similarly, the amount of glue used for wood-based panels has also increased significantly. Since urea-formaldehyde resin is the cheapest variety in synthetic resins, as a wood adhesive, it has the characteristics of excellent bonding per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/38C09J161/32C09J199/00C09J11/04C09J11/06
CPCC08G12/38C08G12/40C09J11/04C09J11/06C09J161/32C08L99/00C08K13/02C08K3/16C08K5/29C08K5/21C08K5/17
Inventor 邱海文
Owner 广州市长安粘胶制造有限公司
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