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A kind of e0 grade environment-friendly modified urea-formaldehyde resin for particleboard and preparation method thereof

A urea-formaldehyde resin and particle board technology, applied in the field of urea-formaldehyde resin, can solve the problems of unstable formaldehyde emission, large fluctuation of solid content, poor slab pre-compression performance, etc., to improve the pre-compression effect, reduce the release amount, and reduce the heat of reaction. Effect

Active Publication Date: 2019-03-26
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

[0005] The biggest problem with urea-formaldehyde resin for particleboard is the large variability in the synthesis process. When the synthesis temperature, pH and F / U molar ratio (that is, the molar ratio of formaldehyde and urea) change slightly, the properties of the synthesized resin will change. Moreover, the synthesis process requires vacuum dehydration, and there are quality problems such as large fluctuations in solid content, poor slab pre-compression performance, and unstable state of formaldehyde emission. In order to maintain its stable performance, precise synthesis control technology is required.

Method used

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  • A kind of e0 grade environment-friendly modified urea-formaldehyde resin for particleboard and preparation method thereof
  • A kind of e0 grade environment-friendly modified urea-formaldehyde resin for particleboard and preparation method thereof

Examples

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Effect test

Embodiment 1

[0048] Particleboard of the present invention uses E 0 An example of grade environment-friendly modified urea-formaldehyde resin. In the present embodiment, the synthesis of the urea-formaldehyde resin comprises the following steps:

[0049] (1) Put formaldehyde into the reaction kettle, stir, adjust the pH to 3.0 with acid, and raise the temperature to 45°C, add polyvinyl alcohol, and keep warm for 35 minutes;

[0050] (2) Add the first batch of urea and keep warm at 45°C for 35 minutes;

[0051] (3) Add alkali to adjust pH=7.0~7.5, mix the second batch of urea and melamine into the reactor;

[0052] (4) Heat up to 90°C, time and keep warm for 60 minutes, and check that the pH is ≥ 6.5;

[0053] (5) Cool down to 83°C, add acid to adjust pH=4.8-5.2, carry out polycondensation to the target viscosity of 150-180 cp / 30°C, and terminate the reaction;

[0054] (6) Cool down, add alkali to adjust pH=6.0~6.3, add the third batch of urea to the reactor, keep warm at 82°C for 35 mi...

Embodiment 2

[0061] Particleboard of the present invention uses E 0 An example of grade environment-friendly modified urea-formaldehyde resin. In the present embodiment, the synthesis of the urea-formaldehyde resin comprises the following steps:

[0062] (1) Put formaldehyde into the reaction kettle, stir, adjust the pH to 3.0 with strong acid, and raise the temperature to 55°C, add polyvinyl alcohol, and keep warm for 25 minutes;

[0063] (2) Add the first batch of urea and keep warm at 55°C for 25 minutes;

[0064] (3) Add alkali to adjust pH=7.0~7.5, mix the second batch of urea and melamine into the reactor;

[0065] (4) Heat up to 92°C, time and keep warm for 40 minutes, and check that the pH is ≥ 6.5;

[0066] (5) Lower the temperature to 93°C, add acid to adjust the pH=4.8-5.2, carry out polycondensation to the target viscosity of 150-180 cp / 30°C, and terminate the reaction;

[0067] (6) Cool down, add alkali to adjust pH=6.0~6.3, add the third batch of urea to the reaction kett...

Embodiment 3

[0074] Particleboard of the present invention uses E 0 An example of grade environment-friendly modified urea-formaldehyde resin. In the present embodiment, the synthesis of the urea-formaldehyde resin comprises the following steps:

[0075] (1) Put formaldehyde into the reaction kettle, stir, adjust the pH to 3.0 with strong acid, and raise the temperature to 50°C, add polyvinyl alcohol, and keep warm for 30 minutes;

[0076] (2) Add the first batch of urea and keep warm at 50°C for 30 minutes;

[0077] (3) Add alkali to adjust pH=7.0~7.5, mix the second batch of urea and melamine into the reactor;

[0078] (4) Heat up to 90°C, time and keep warm for 50 minutes, and check that the pH is ≥ 6.5;

[0079] (5) Cool down to 88°C, add acid to adjust pH=4.8-5.2, carry out polycondensation to the target viscosity of 150-180 cp / 30°C, and terminate the reaction;

[0080] (6) Cool down, add alkali to adjust pH=6.0~6.3, add the third batch of urea to the reactor, keep it warm at 85°C...

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Abstract

The invention discloses E0-level environment-friendly modified urea formaldehyde resin for a shaving board. In addition, the invention also discloses a preparation method of the E0-level environment-friendly modified urea formaldehyde resin for the shaving board. The preparation method is characterized by adopting high-concentration formaldehyde and urea which are low in molar ratio as raw materials and modifying urea formaldehyde resin by adding polyvinyl alcohol, melamine and a reinforcing agent. Through accurate control of a synthesis technology, a vacuum dewatering technological process is omitted, and the prepared urea formaldehyde resin is low in formaldehyde content, good in pre-pressing property, high in internal binding strength and surface binding strength and low in cost.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin, in particular to a modified urea-formaldehyde resin and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, my country's wood-based panel industry has developed rapidly. There are currently more than 10,000 wood-based panel companies with an output of more than 200 million cubic meters and an output value of more than 800 billion yuan. It is the world's largest 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 2012, the amount of glue used for wood-based panels alone reached 24.924 million tons, equivalent to 13.122 million tons of solid adhesives. The urea-formaldehyde resin adhesive accounts for more than 90% of the glue used in wood-based panels, and is the largest variety in the adhesive. U...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/38C08L61/32
CPCC08G12/38C08G12/40C08L61/32
Inventor 邱海文
Owner 广州市长安粘胶制造有限公司
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