Preparation method of straw ethanol by-product urea-formaldehyde resin

A technology of urea-formaldehyde resin and by-products, which is applied in the fields of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesive additives, etc., can solve the problems of high free formaldehyde in urea-formaldehyde resins, rely on petroleum products for water resistance, etc., and achieve Improve water resistance, achieve resource utilization, and reduce sugar content

Active Publication Date: 2016-03-23
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem to be solved: In order to solve the problems of high free formaldehyde of urea-formaldehyde resin, dependence on petroleum products and poor water resistance, the present invention proposes a preparation method of urea-formaldehyde resin, a by-product of straw ethanol

Method used

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  • Preparation method of straw ethanol by-product urea-formaldehyde resin
  • Preparation method of straw ethanol by-product urea-formaldehyde resin

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preparation example Construction

[0017] A method for preparing straw ethanol by-product urea-formaldehyde resin glue, the preparation steps are:

[0018] The first step: add 36.8wt.% formaldehyde solution, water, pre-pressing modifier, the first batch of urea, the first batch of melamine and the first batch of straw ethanol by-products into the reactor, wherein the water / formaldehyde mass ratio is 0.40 ~1.54:1, the mass ratio of pre-press modifier / formaldehyde is 0.001~0.02:1, the mass ratio of the first batch of urea / formaldehyde is 0.70~1.20:1, the mass ratio of the first batch of melamine / formaldehyde is 0.02 ~0.14:1, in order to adjust the pH value to 7.0~9.0, raise the temperature to 80~95℃, react for 30~50min; the second step: adjust the pH to 4.0~6.5, react at 80~95℃, control the reaction at 30min~120min to the cloud point;

[0019] Step 3: Add the second batch of urea, the second batch of melamine and the second batch of straw ethanol by-products, wherein the mass ratio of the second batch of urea / fo...

Embodiment 1

[0024]Step 1: Add 250g of 36.8wt.% formaldehyde solution, 37.8g of water, 0.1g of polyvinyl alcohol 2699, 102.7g of the first batch of urea, 2g of the first batch of melamine and 10g of the first batch of straw ethanol in a 500mL four-necked flask product. Start stirring and adjust the pH value to 7.0 with 30wt.% NaOH solution, raise the temperature to 80°C, and react for 30 minutes;

[0025] The second step: use 20wt.% NH 4 Adjust the pH of the Cl solution to 4.0, and react at 85°C for 30 minutes to the cloud point;

[0026] Step 3: Add the second batch of urea 34.5g, the second batch of melamine 2g, the second batch of straw ethanol by-product 10g, adjust the pH to 6.0 with 30wt.% NaOH solution, and react at 90°C for 30min.

[0027] Step 4: Add the third batch of melamine 12g and straw ethanol by-product 10g, adjust the pH value to 7.1 with 30wt.% NaOH solution, and react at 90°C for 30min.

[0028] Step 5: Cool down to 70°C, add the third batch of urea 34g, react for 10-...

Embodiment 2

[0031] Step 1: Add 250g of 36.8wt.% formaldehyde solution, 50.8g of water, 0.7g of polyvinyl alcohol 1799, 90g of the first batch of urea, 4g of the first batch of melamine and 15g of the first batch of straw ethanol by-products in a 500mL four-neck flask . Start stirring and adjust the pH value to 7.5 with 30wt.% NaOH solution, raise the temperature to 85°C, and react for 40min;

[0032] The second step: use 20wt.% NH 4 Adjust the pH of the Cl solution to 4.5, and react at 90°C for 80 minutes to the cloud point;

[0033] Step 3: add the second batch of urea 27.5g, the second batch of melamine 4g, the second batch of straw ethanol by-product 15g, react at 90°C for 30min, and adjust the pH to 6.5 with 30wt.% NaOH solution;

[0034] Step 4: Add the third batch of melamine 24g and straw ethanol by-product 15g, adjust the pH value to 7.5 with 30wt.% NaOH solution, and react at 85°C for 40min.

[0035] Step 5: Cool down to 70°C, add the third batch of urea 27.5g, react for 10min...

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Abstract

The invention relates to a preparation method of a urea-formaldehyde resin from a straw ethanol byproduct, which comprises the following steps: 1. adding a formaldehyde solution, water, a prepressing modifier, a first batch of urea, a first batch of melamine and a first batch of straw ethanol byproduct into a reactor, regulating the pH value, and heating to react; 2. regulating the pH value and controlling the temperature to react to a cloud point; 3. adding a second batch of urea, a second batch of melamine and a second batch of straw ethanol byproduct, regulating the pH value and controlling the temperature to react; 4. adding a third batch of melamine and a third batch of straw ethanol byproduct, regulating the pH value and controlling the temperature to react; and 5. cooling, adding a third batch of urea to react, cooling and discharging. The straw ethanol byproduct used by the method has the advantages of lower ash content and lower sugar content, and the lignin molecule structure maintains multiple phenolic hydroxyl groups, alcoholic hydroxyl groups and replaceable active hydrogen. By using the straw ethanol byproduct instead of part of the urea or phenol to prepare the adhesive, the method can save the petroleum resources and implement waste recovery.

Description

technical field [0001] The invention belongs to the technical field of wood adhesives, and in particular relates to a method for preparing urea-formaldehyde resin glue, in particular to a method for preparing urea-formaldehyde resin, a by-product of straw ethanol. Background technique [0002] Urea-formaldehyde resin glue has become the most widely used and most used adhesive in the wood industry due to its cheap and easy-to-obtain raw materials and light color. In 2013, the total output of wood-based panels in my country was 272 million m 3 , more than 10 million tons of wood glue is used, and urea-formaldehyde resin accounts for more than 80%. Due to the poor water resistance of urea-formaldehyde resin, a large amount of free formaldehyde remains in the resin, and there are unstable groups such as methylene ether bonds and methylol groups on the polymer structure chain that can decompose formaldehyde, resulting in the artificial The release of formaldehyde from the board...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C09J161/32C09J11/04C09J11/08
Inventor 王春鹏胡岚方南静娅王利军储富祥金立维许玉芝
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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