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Continuous production system of cooperative type urea-formaldehyde resin adhesive and production method

A technology of urea-formaldehyde resin glue and production system, which is applied in the directions of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem that the degree of reaction and the production process are not easy to control, there are many users, and the product quality varies greatly. and other problems, to achieve the effect of completely consistent product quality standards, small changes in heat demand, and continuous production process

Active Publication Date: 2018-05-04
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional production process and production equipment have the following main problems: (1) Environmental pollution: In the production process of using traditional process and equipment, it is necessary to manually adjust the pH and test the reaction end point, and it is inevitable to discharge a large amount of unreacted formaldehyde, which is harmful to the environment. cause serious pollution
(2) High energy consumption and low yield
In the traditional production technology, the loss of electricity, heat and water is large, resulting in high energy consumption; at the same time, because the whole process is carried out in a non-closed environment, there are more discharges, which pollute the environment and reduce the yield
(3) The quality of different batches of products varies greatly
Due to the batch production, the control of the reaction end point is different, and the quality of each batch of products varies greatly.
(4) The production process is not easy to control
Since the reaction process is greatly affected by pH and temperature, and is very sensitive, the reaction degree and production process are not easy to control, and it is easy to produce gel or the reaction fails to meet the requirements, which affects the product quality.
(5) The production process is cumbersome and the labor load of workers is large
Since the feeding and process control are all done manually, there are many users and a large amount of labor
(6) Different products cannot be completed at the same time
In addition, the products produced by traditional crafts have the disadvantages of poor water resistance, aging resistance and toughness, especially in today's increasingly environmental awareness and requirements, traditional craft products release a large amount of free formaldehyde during production and use, polluting the environment , will seriously restrict and limit the use of the product
As residents pay more attention to environmental protection and safety issues, the existing production methods of urea-formaldehyde resin adhesives have been restricted in application. In order to maintain the normal development of the wood industry, technological innovation must be carried out

Method used

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  • Continuous production system of cooperative type urea-formaldehyde resin adhesive and production method
  • Continuous production system of cooperative type urea-formaldehyde resin adhesive and production method
  • Continuous production system of cooperative type urea-formaldehyde resin adhesive and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of synergistic urea-formaldehyde resin adhesive continuous production system, such as figure 1 As shown, it is composed of a first-level general-purpose reactor 1, a second-level general-purpose reactor 2, a third-level general-purpose reactor 3, a first-level equilibrium reactor 4, a second-level equilibrium reactor 5, and a product storage container 6. Connection composition; wherein the first-level general-purpose reactor 1 and the second-level general-purpose reactor 2 are also connected in turn with a material delivery pump 7 and a first-level acceleration reactor 8. Similarly, the second-level general-purpose reactor 2 and the third-level The general-purpose reactor 3 is also connected with a material transfer pump 7 and a secondary acceleration reactor 9, and the three-stage general-purpose reactor 3 is connected to the primary balance reactor 4 through the material transfer pump 7, and then the primary balance reactor 4. The discharge port is connected to...

Embodiment 2

[0051] When utilizing the production system of the embodiment of the present invention 1 to be used for preparing urea-formaldehyde resin, its specific production method is as follows:

[0052] Inject 37% formaldehyde / urea into the first-stage general-purpose reactor 1 with a molar ratio of 2.7 / 1 and mix for 15-20 minutes. The temperature is controlled at 90°C and the stirring speed is 20-100 rpm. Then use 30% sodium hydroxide aqueous solution to adjust the pH to 8.0-10. After adjusting the pH, start the continuous feeding, and turn on the material delivery pumps and subsequent reactors at all levels. Continuously inject the mixed liquid into the primary acceleration reactor 8 through the primary material delivery pump, and react at 90-100°C for 30-60 seconds to generate the primary reaction liquid; inject the reaction liquid into the secondary general-purpose reactor 2 , add urea, so that the formaldehyde / urea mol ratio in the secondary general-purpose reactor 2 reaches 1.8 / 1...

Embodiment 3

[0054] When utilizing the production system of the embodiment of the present invention 1 to be used for preparing urea-formaldehyde resin, its specific production method is as follows:

[0055] Mix 37% formaldehyde / urea / melamine in the first-stage general-purpose reactor 1 for 15-20 minutes according to the molar ratio of 2.3 / 1 / 0.022. The temperature is controlled at 90-95°C, and the stirring speed is 20 rpm~ 100 rpm, adjust the pH to 8~10.0 with 30% alkaline solution, after adjusting the pH, continuously inject the liquid in the first-level general-purpose reactor 1 into the first-level acceleration reactor 8 (at the same time, open the subsequent reaction devices at all levels ), react at 90-100°C for 30 seconds to 60 seconds to generate a primary reaction solution; the primary reaction solution is injected into the secondary general-purpose reactor 2, and urea is added to make the formaldehyde / urea in the secondary general-purpose reactor 2 The mol ratio reaches 1.65 / 1, the...

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Abstract

The invention discloses a continuous production system of a cooperative type urea-formaldehyde resin adhesive and a production method. The production system comprises a plurality of grades of general-purpose reactors, a first-grade balance reactor, a second-grade balance reactor and a product storage device, wherein the general-purpose reactors are connected sequentially in series and then are connected with the first-grade balance reactor; the first-grade balance reactor is connected with the second-grade balance reactor; the second-grade balance reactor is connected with the product storagedevice through a material conveying pump; the general-purpose reactors are connected with the first-grade balance reactor through the material conveying pump; the adjacent general-purpose reactors arefurther connected with the material conveying pump and an acceleration reactor in sequence. The continuous production system and the production method, disclosed by the invention, are carried out ina completely sealed environment and no harmful substances are emitted; a reaction process is completely and automatically finished by a machine; the plurality of general-purpose reactors, the acceleration reactor and the balance reactors have a cooperative effect and all raw materials rapidly and completely react and a product is continuously prepared in one step, so that manpower and material resources are saved, a production environment is purified and the market competitiveness is extremely great.

Description

technical field [0001] The invention relates to a continuous production system and production method of a synergistic urea-formaldehyde resin adhesive, belonging to the technical field of chemical production. Background technique [0002] Urea-formaldehyde resin was first synthesized by B.Tollens in 1844, and was first used after the research of C.Goldschmidt and others around 1896. In 1929, IG company developed a urea-formaldehyde resin condensation intermediate named Kanrit Leim that can cure glued wood at room temperature , attracting people's attention. Because urea-formaldehyde resin has the advantages of good initial bonding strength, fast curing, light color, no pollution to wood, high bonding strength, and convenient use, it is widely used in plywood, particleboard, medium density fiberboard, wood-based panel secondary processing, paper products, fiber products, It has been widely used in interior decoration and other aspects. It is the most produced variety of adhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/38C08G12/36C09J161/24C09J161/30
CPCC09J161/24C09J161/30C08G12/36C08G12/38
Inventor 郭金亭纪合建
Owner LINYI UNIVERSITY