Preparation method of lignin phenolic resin

A technology of phenolic resin and lignin, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve the problems of purity and methylol content, and achieve equipment saving and process simplification , Improve the effect of product quality

Active Publication Date: 2011-01-12
ANHUI GEYI CYCLIC ECONOMY IND PARK
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Problems solved by technology

[0008] The purity of lignin in liquid lignin is ≥90%, and the content of hydroxymethyl groups is ≥20, while the lig

Method used

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  • Preparation method of lignin phenolic resin
  • Preparation method of lignin phenolic resin
  • Preparation method of lignin phenolic resin

Examples

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Embodiment Construction

[0036] Non-limiting examples are described as follows:

[0037] (1) Preparation of liquid lignin

[0038] 1. Take bamboo shavings or wheat straw, Wujiesang (Miscanthus Anderss. Miscanthus, Poaceae) and other agricultural and forestry wastes, crush them and put them into the explosion chamber of the steam explosion machine in stages, and keep them under the pressure of 1.0MPa ~ 2.5MPa. After pressing for 180s-500s, steam-explode to obtain steam-explosive substances; wash the steam-explosive substances with water, press filter with a rotary screen, take the filter residue and add sodium hydroxide with a mass fraction of 10% of its dry weight, and add 2 to 5 times of water to mix evenly to make the submerged The filter residue is boiled at 85°C to 130°C for 0.5 to 1.5 hours to obtain the alkali boiled product; after cooling, the alkali boiled product is centrifuged to obtain the crude alkali lignin liquid, which is then classified by ultrafiltration membrane and nanofiltration me...

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Abstract

The invention relates to a preparation method of lignin phenolic resin, which comprises the steps of directly stirring liquid lignin, phenol and formaldehyde for reaction under the action of liquid caustic soda at the temperature of 70-100 DEG C and obtaining the lignin phenolic resin. The liquid lignin is lignin alkaline solution obtained by stage-by-stage separation through steam explosion, stewing by adding alkali, film treatment and other technological processes of grasses or/and ligneous plants, the solid content is 10-25%, and the pH is 10.5-13.5. The preparation method can avoid the purification and the activation treatment by using the high-pure liquid lignin in comparison with coarse lignin powder taken from paper pulp black liquor, thereby not only improving the product quality, but also simplifying the process, saving the equipment investment, simultaneously greatly reducing the energy consumption, the consumption of raw materials and the production cost and being more environment-friendly.

Description

1. Technical field [0001] The invention relates to a method for preparing an organic binder, in particular to a method for preparing a lignin phenolic resin. 2. Background technology [0002] Lignin phenolic resin (LPF) is an adhesive widely used in the wood processing industry. LPF is obtained by processing phenol, formaldehyde and lignin as main raw materials, such as the preparation methods of LPF disclosed in CN101358120A, CN101348698A, CN1632030A, CN101284899A and the like. The crude lignin separated and prepared from papermaking black liquor is subjected to multi-stage operations such as acid precipitation, cleaning, alkali dissolution, and methylolation to purify it, and then activate it to increase the content of active group methylol , and finally mixed with resole phenolic resin in a certain proportion to obtain LPF resin. [0003] The method for producing crude lignin from the black liquor of papermaking pulp, such as the extraction methods disclosed in Chinese ...

Claims

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Application Information

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IPC IPC(8): C08G8/28C09J161/14
Inventor 管淑清陈存武陈宇陈乃富宗武郭万宏曾飞
Owner ANHUI GEYI CYCLIC ECONOMY IND PARK
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