Method for preparing formaldehyde-free fiberboard using dialdehyde cellulose

A technology of dialdehyde cellulose and fiberboard, which is used in applications, household components, flat products, etc., can solve the problems of limited application and high production cost, and achieve the effects of moderate price, good physical properties and saving synthesis time.

Inactive Publication Date: 2017-03-08
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] US 2013/8378056B2 "Formaldehyde-free Binders" (Formaldehyde-free Binders), US2011/0009530 A1 "Formaldehyde-free Binders for Producing Wood Products" (formaldehyde-free Binders for Producing Wood Products), German patent publication GER 1994/ DE4308089 A1 "Formaldehyde-free binders for wood" (Formaldehyde-free binders for wood), domestic patent publications CN1899783A "A method for producing boards using crop straws", CN101085532A "Formaldehyde-free

Method used

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  • Method for preparing formaldehyde-free fiberboard using dialdehyde cellulose
  • Method for preparing formaldehyde-free fiberboard using dialdehyde cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Formaldehyde-free fiberboard is synthesized from corn stover and dialdehyde cellulose as raw materials.

[0022] (1) Preparation of dialdehyde cellulose

[0023] Weigh 2g of absolutely dry bleached softwood pulp cellulose into a 250mL three-necked round bottom flask, add 100mLH 2 O, place the reactor in a constant temperature oil bath, then add 2.37g sodium periodate (analytical purity), and add 0.3mol / L HCl solution to adjust the pH to 2. In order to avoid the decomposition of sodium periodate, the reaction Enter nitrogen as a protective gas and perform shading treatment, and react for 5 hours at a temperature of 45°C. After the reaction is over, 110 mL of 0.1 mol / L ethylene glycol solution is added to react the excess sodium periodate. Vacuum filtration and drying to obtain dialdehyde cellulose.

[0024] (2) Straw pellets

[0025] A mechanical crushing method is used to crush the corn stalks to 75 micron size straw particles.

[0026] (3) Preparation of formaldehyde-free fib...

Embodiment 2

[0030] Formaldehyde-free fiberboard is synthesized from corn stover and dialdehyde cellulose as raw materials.

[0031] (1) Preparation of dialdehyde cellulose

[0032] Weigh 2g of absolutely dry bleached softwood pulp cellulose into a 250mL three-necked round bottom flask, add 100mLH 2 O, place the reactor in a constant temperature oil bath, then add 2.37g sodium periodate (analytical purity), and add 0.3mol / L HCl solution to adjust the pH to 2. In order to avoid the decomposition of sodium periodate, the reaction Enter nitrogen as a protective gas and perform shading treatment, and react for 5 hours at a temperature of 45°C. After the reaction is over, 110 mL of 0.1 mol / L ethylene glycol solution is added to react the excess sodium periodate. Vacuum filtration, drying to obtain dialdehyde cellulose.

[0033] (2) Straw pellets

[0034] A mechanical crushing method is used to crush the corn stalks to 75 micron size straw particles.

[0035] (3) Preparation of formaldehyde-free fiberb...

Embodiment 3

[0039] Formaldehyde-free fiberboard is synthesized from corn stover and dialdehyde cellulose as raw materials.

[0040] (1) Preparation of dialdehyde cellulose

[0041] Weigh 2g of absolutely dry bleached softwood pulp cellulose into a 250mL three-necked round bottom flask, add 100mLH 2 O, place the reactor in a constant temperature oil bath, then add 2.37g sodium periodate (analytical purity), and add 0.3mol / L HCl solution to adjust the pH to 2. In order to avoid the decomposition of sodium periodate, the reaction Enter nitrogen as a protective gas and perform shading treatment, and react for 5 hours at a temperature of 45°C. After the reaction is over, 110 mL of 0.1 mol / L ethylene glycol solution is added to react the excess sodium periodate. After vacuum filtration and drying, the dialdehyde cellulose is obtained.

[0042] (2) Straw pellets

[0043] A mechanical crushing method is used to crush the corn stalks to 70 micron size straw particles.

[0044] (3) Preparation of formalde...

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Abstract

The present invention discloses a method for preparing a formaldehyde-free fiberboard using dialdehyde cellulose and belongs to the technical field of fiberboard production. According to the invention, the dialdehyde cellulose is mixed with straw pellets under a condition of 160-190 DEG C for subsequent hot-pressing molding, where 0.5%-20% of dialdehyde cellulose and the balance of the straw pellets are used. According to the invention, the dialdehyde cellulose having highly active aldehyde groups is used as an adhesive to crosslink the straw pellets such that the prepared fiberboard is formaldehyde-free and has good physical properties. According to the invention, by using agricultural straws as the major raw materials instead of wood, resource waste and environmental pollution due to a large quantity of burnt agricultural straws in China may be effectively solved while the production cost is reduced. Furthermore, according to the invention, raw materials for synthesizing the dialdehyde cellulose are widely available and moderately priced, and a synthesis process for the dialdehyde cellulose is simple with short synthesis time, and thus is conducive to industrial production.

Description

Technical field [0001] The invention relates to a method for preparing a fiberboard, in particular to a method for preparing a formaldehyde-free fiberboard by using dialdehyde cellulose. Background technique [0002] Fiberboard is an excellent building material due to its high strength coefficient and good electrical insulation, and it has been widely produced in many parts of the world. Since the new century, the average annual growth rate of man-made fiberboard in my country has exceeded 20%, and it has become the world's largest producer and consumer of man-made fiberboard. In 2014, the output of my country's man-made fiberboard reached 30,123,300 cubic meters, an increase of 11% year-on-year. In the future, the product structure of the man-made fiberboard industry will become more reasonable, product quality will steadily improve, low-quality products will gradually withdraw from the market, and product prices will become more reasonable. Urea Formaldehyde Resin (UF), Pheno...

Claims

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Application Information

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IPC IPC(8): B27N3/02B27N3/08B27N3/00C08B15/02
CPCB27N3/02B27N3/002B27N3/08C08B15/02
Inventor 王鹏董存军谢益民王祎帆范建云王磊安俊键张光彦
Owner HUBEI UNIV OF TECH
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