Modified lignin glue and its production

A lignin and modification technology, applied in the direction of adhesives, etc., can solve problems such as sales impact, increased cost of chemical products, and price rise

Inactive Publication Date: 2006-11-01
广西华意化学工业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous exploitation of petroleum resources, petroleum resources are becoming increasingly tense, and the price of petroleum resources has risen rapidly, resulting in a continuous rise in the price of petroleum products, which greatly increases the cost of chemical products that use petroleum products as raw materials, and greatly affects sales; such as phenol industrial raw materials. / ton, which has risen to 15,000 yuan / ton in February this year. Due to the rise in the price of phenol, the price of phenolic resin glue with phenol as raw material has risen sharply, making it difficult for users to accept. In addition, phenolic resin glue is generally added with 1 times the content of phenol It is made of 0.6-1 times or more formaldehyde and a small amount of additives. During the production process, the formaldehyde content in the raw material components is high, and the release of toxic components formaldehyde and phenol released by the phenolic resin glue produced is high. Therefore, it is urgent to find A product that can not only replace phenol as the main raw material, but also produce products with low content of free phenol and free formaldehyde and good environmental performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one: a kind of modified lignin glue and preparation method thereof:

[0030] Take each component by weight of the following components: 240g of industrial grass lignin, 286.6g of industrial formaldehyde with a content of 37%, 120g of industrial phenol, 50.5g of caustic soda, 240g of water,

[0031] Dissolve caustic soda in water and cool it for later use, add the rest of the raw materials into the reaction bottle according to the above ratio, stir well, add sodium hydroxide aqueous solution, react at 40°C for 4-8 hours and cool to room temperature to obtain modified lignin glue , the solid content of the glue is 48%, and the viscosity is measured by coating 4 cups at 25°C for 80 seconds. Use it to press poplar plywood (temperature: 130-135°C, unit pressure: 1Mpa, time: 70s / mm veneer thickness) , its average bonding strength is 1.0Mpa (measured according to the standard of Class I plywood), and the formaldehyde emission is 0.4mg / L (by desiccator method), reach...

Embodiment 2

[0032] Embodiment two: a kind of modified lignin glue and preparation method thereof:

[0033] Take by weighing the following components in proportion: industrial lignin 264g, 37% concentration industrial formaldehyde 327g, industrial phenol 120g, 40% concentration sodium hydroxide aqueous solution 151.5g, water 260g, industrial lignin, formaldehyde, industrial phenol, water Add it into the reaction bottle, stir well, add sodium hydroxide aqueous solution, react at a temperature of 50°C for 4-8 hours and cool to room temperature to obtain modified lignin glue. The solid content of the glue is 40%. The viscosity measured at 25° C. is: 50 seconds. Add this modified lignin glue into the straw fiber and use it to make a medium-fiber board containing straw fiber. The internal bonding strength is 0.40 MPa, and the water absorption thickness expansion rate is 13.5%.

[0034] As a transformation of the embodiments of the present invention, this modified lignin glue can also be added t...

Embodiment 3

[0035] Embodiment three: a kind of modified lignin glue and preparation method thereof:

[0036] Take by weighing following each component material in proportion: industrial lignin 300g, 37% concentration industrial formaldehyde 300g, industrial phenol 100g, sodium hydroxide 50g, water 250g, by the method described in embodiment one, caustic soda (NaOH) is dissolved in water Cool for later use, add the remaining raw materials into the reaction bottle according to the above ratio, stir well, add sodium hydroxide aqueous solution, react at a temperature of 60°C for 4 to 8 hours, and then cool to room temperature to obtain modified lignin glue. The content is 50%, and the viscosity is measured by coating 4 cups at 25°C: 100 seconds.

[0037] In each of the above examples:

[0038] The lignin can also be a mixture of woody lignin and grass lignin, and its mixing ratio is: woody lignin: grass lignin=1:1~1:10, and the grass lignin is made from straw or wheat straw Alkali lignin ex...

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Abstract

Modified lignin glue and its production are disclosed. The lignin glue consists of lignin 20-30wt%, 37% formaldehyde 25-35wt%, reinforcing agent 10-15wt%, catalyst 4-8wt% and solvent residue. The process is carried out by mixing multiple components together, putting them into reactor, reacting at 40-80degree for 4-8hrs, and cooling to room temperature to obtain final product. The lignin contains hydroxyl-phenyl structured oxamycin or mixture of ligneous lignin and oxamycin, the reinforcing agent is phenol or 1,3-benzenediol or mcresotyl phenol compound, catalyst is sodium hydrate or magnesium hydrate or ammonium hydroxide or caustic potash or theirs mixtures, solvent is water or alcohol or alcohol solution. It can be used for wooden plywood and medium-fiber board.

Description

Technical field: [0001] The invention relates to an adhesive and a preparation method thereof, in particular to a modified lignin glue and a preparation method thereof. Background technique: [0002] With the continuous exploitation of petroleum resources, petroleum resources are becoming increasingly tense, and the price of petroleum resources has risen rapidly, resulting in a continuous rise in the price of petroleum products, which greatly increases the cost of chemical products that use petroleum products as raw materials, and greatly affects sales; such as phenol industrial raw materials. / ton, which has risen to 15,000 yuan / ton in February this year. Due to the rise in the price of phenol, the price of phenolic resin glue with phenol as raw material has risen sharply, making it difficult for users to accept. In addition, phenolic resin glue is generally added with 1 times the content of phenol It is made of 0.6-1 times or more formaldehyde and a small amount of addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J197/00
Inventor 刘启明
Owner 广西华意化学工业有限公司
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