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Lignin-based filler and preparation method and application of lignin-based filler

A lignin-based, industrial alkali lignin technology, applied in the field of lignin-based fillers and its preparation, can solve the problems of unsatisfactory bonding strength of wood-based panels, poor mechanical properties of the adhesive layer, poor strength, etc., and achieve the best industrial application prospects, The effect of reducing formaldehyde emission and simple preparation method

Active Publication Date: 2015-01-28
BEIJING FORESTRY UNIVERSITY
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  • Claims
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Problems solved by technology

However, these fillers have some problems, such as using inorganic mineral powder as adhesive filler, which is prone to loose blanks after pre-pressing the adhesive, which affects the production efficiency of wood-based panels; using natural organic powder such as fruit shell powder as adhesive Not only the pre-pressing effect of the filler is not good, but also the strength of these powders is poor, resulting in poor mechanical properties of the adhesive layer after curing, and unsatisfactory bonding strength of wood-based panels; polyvinyl alcohol powder, hydroxymethyl cellulose and other synthetic organic matter are used as adhesives. Although the effect of agent filler is better, its cost is too high, it is difficult to industrialize

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  • Lignin-based filler and preparation method and application of lignin-based filler

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preparation example Construction

[0038] As mentioned above, Embodiment 1 of the present invention provides a method for preparing a lignin-based filler, including: hydrolyzing agricultural and forestry biomass residues; purifying industrial alkali lignin; hydrolyzing the obtained agricultural and forestry The biomass residue powder is mixed with the industrial alkali lignin powder obtained after purification treatment to obtain the lignin-based filler. Wherein, the steps of hydrolysis treatment are as follows: mixing the agricultural and forestry biomass residues with an aqueous catalyst solution, the aqueous catalyst solution being any one or several acidic solutions of sulfuric acid solution, hydrochloric acid solution or acetic acid solution; mixing the agricultural and forestry biomass residues performing hydrolysis treatment with an aqueous catalyst solution; drying and pulverizing the agricultural and forestry biomass residue after the hydrolysis treatment to obtain the agricultural and forestry biomass ...

Embodiment 5

[0067] 1. Preparation of filler

[0068] (1) After crushing corn stalks to 1cm-sized particles, mix them with sulfuric acid solution with a mass percent concentration of 0.5% at a solid-to-liquid ratio of 1:5, react at 140°C and 0.5MPa pressure for 1.5h, and then hydrolyze the The corn stover hydrolyzed solids were dried and crushed to 200 mesh.

[0069] (2) After the corncob industrial alkali lignin is dissolved in a system with pH=10.5, the pH thereof is adjusted to 2, and the obtained acid-analyzed corncob industrial alkali lignin solid is dried and crushed to 200 mesh.

[0070] (3) Fully mix 50 parts by mass of hydrolyzed corn stalk powder and 50 parts of purified corncob industrial alkali lignin powder to obtain a lignin-based natural polymer urea-formaldehyde resin filler.

[0071] 2. Adhesive preparation and plywood preparation

[0072] Set up three glue mixing schemes: (1) mix 100 parts by mass of urea-formaldehyde resin with 30 parts of lignin-based natural polymer ...

Embodiment 6

[0074] 1. Preparation of filler

[0075] (1) Wheat straw is crushed to 2 cm in size, mixed with hydrochloric acid solution with a mass percentage concentration of 2% at a solid-to-liquid ratio of 1:10, reacted for 3 hours at 140°C and 0.7 MPa pressure, and then the hydrolyzed wheat Straw solids were dried and crushed to 350 mesh.

[0076] (2) After dissolving poplar basic kraft lignin in a system with pH=11.5, adjust its pH to 2.5, and dry and pulverize the obtained acid-analyzed poplar basic kraft lignin solid to 350 mesh.

[0077](3) Fully mix 75 parts by mass of hydrolyzed wheat straw powder and 25 parts of purified poplar alkaline sulfate lignin powder to obtain a lignin-based natural polymer urea-formaldehyde resin filler.

[0078] 2. Adhesive preparation and plywood preparation

[0079] Set up three glue mixing schemes: (1) mix 100 parts by mass of urea-formaldehyde resin with 30 parts of lignin-based natural polymer urea-formaldehyde resin filler; (2) mix 100 parts by...

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Abstract

The invention discloses lignin-based filler and a preparation method and application of the lignin-based filler, relates to the field of chemical engineering, and aims to obtain urea-formaldehyde resin adhesive filler having a low cost of production and ideal using effects and being capable of completely replacing flour. The technical scheme is mainly adopted as follows: an agriculture and forestry biomass residue is subjected to hydrolysis treatment to obtain agriculture and forestry biomass residue powder; industrial alkali lignin is subjected to purification treatment to obtain purified industrial alkali lignin powder; the agriculture and forestry biomass residue powder and the industrial alkali lignin powder are mixed to obtain the lignin-based filler. The lignin-based filler disclosed by the invention is mainly used as a urea-formaldehyde resin adhesive additive.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a lignin-based filler and its preparation method and application. Background technique [0002] my country's wood-based panel industry is developing rapidly. At present, the output of wood-based panels ranks first in the world, and there is a steady growth trend. Wood-based panels are the industry with the largest amount of adhesives, and urea-formaldehyde resin has become the first choice for the wood-based panel industry due to its low price, and is currently the largest woodworking adhesive. In the production process of wood-based panels, some flour (20% to 30%) needs to be added to the urea-formaldehyde resin as a filler to improve the pre-compression performance of the adhesive, prevent glue penetration and glue shortage, and reduce the resin The internal stress of the adhesive layer after curing ensures the bonding strength. Therefore, the amount of flour consumed as a fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/08C09J161/24C08H7/00
Inventor 孙润仓袁同琦杨昇
Owner BEIJING FORESTRY UNIVERSITY
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