CA1176243A

CA1176243A - Lignocellulose material of improved strength, drainability and beatability and method of producing it

Info

Publication number: CA1176243A
Application number: CA000358943A
Authority: CA
Inventors: Carl-Johan Alfthan; Mats-Olov Hedblom; Zoja Lindh-Nomm; Christer Soremark; Elisabeth Soremark; Bjorn Samuelsson
Original assignee: Sodra Skogsagarna AB; Alby Klorat AB
Current assignee: Sodra Skogsagarna AB; Alby Klorat AB
Priority date: 1979-08-23
Filing date: 1980-08-22
Publication date: 1984-10-16
Also published as: NO802506L; FI68435B; SE446888B; BR8005334A; SE7907034L; NO157340C; FI802653A; NO157340B; FI68435C

Abstract

Abstract of the Disclosure:

Lignocellulose materials of improved strength, drainability och beatability are obtained by treating the material with di- or polyfunctional derivatives which react with hydroxyl groups in the cellulose material under formation of ionized or ionizable groups. The treated material can also be admixed with untreated lignocellulose material, whereby the entire mixture obtains the desired properties.

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Lignocellulose material of improved strength, drainability and beatability, characterized in that, before drying it has been modified to contain ionizable groups chemically bound to hydroxyl groups in the material, said ionizable groups being selected from the group con-sisting of a) anionic groups of inorganic acids, said anionic groups having been obtained by reaction of lignocellulose material with sulfur compounds containing at least one of the groups consisting of S-X and SO M1+ , where X is selected from OH, F Cl, Br and NH2, and M1 is selected from alkali metal and NH4; with phosphorus com-pounds containing at least one of the groups consisting of P - Y and PO-M2+, where Y is selected from OH, Cl and NH2, and M2 = Ml; with ammonium salts selected from the group consisting of sulfamine acid, sulfuric acid, phos-phoric acid, amidophosphoric acid, polyphosphoric acids and amidopolyphosphoric acids, a base which when heated emits ammonia, sulfur trioxide and phosphorus pentoxide, b) carboxylic acid groups and c) cationic groups selected from the group consisting of primary, secondary, tertiary amines and quarternary ammonium derivatives.

2. The lignocellulose material as claimed in claim 1 wherein the ionizable groups are ionized.

3. The lignocellulose material as claimed in claim 1 wherein the base which when heated emits ammonia is urea.

4. The lignocellulose material as claimed in claim 1 or claim 2 characterized in that the material also contains part of a lignocellulose material the hydroxyl groups of which do not carry chemically bound ionized or ionizable groups.

5. Method for the production of lignocellulose material of improved strength, drainability and beat-ability, characterized in that hydroxyl groups in lignocellulose material, which has not been previously dried, are caused to react with polyfunctional compounds under formation of ionizable groups, which compounds are selected from the group consisting of a) compounds forming anionic groups, said compounds being derivatives of a sul-fur compound containing at least one of the groups con-sisting of S-X and SO Ml , where X is selected from OH, F, Cl, Br and NH2, and Ml is selected from alkali metal and NH4, with phosphorus compounds containing at least one of the groups consisting of P - Y and PO-M2+, where Y is selected from OH, Cl and NH2 and M2 = M1-, with ammonium salts selected from the group consisting of sulfamine acid, sulfuric acid, phosphoric acid, amidophosphoric acid, polyphosphoric acids and amidopolyphosphoric acids, a base which when heated emits ammonia, sulfur trioxide and phosphorus pentoxide, b) organic polyfunctional carboxylic acids, and halogenized monocarboxylic acids under formation of anionic groups in the material, and c) compounds that form cationic groups, said compounds being selected from the group consisting of primary, secondary, and tertiary amines, and quaternary ammonium derivatives which are bound to the material with the aid of materials selected from the group consisting of epoxides, chlorohydrins and alkyl halogens.

6. The method as claimed in claim 5, character-ized in that at least 10% of the polyfunctional compound, calculated on the dry weight of the treated material, is used in the reaction.

7. The method as claimed in claim 5, character-ized in that the reaction is carried out at a temperature in the range of 40-140°C.

8. The method as claimed in any of claims 5, 6 or 7, characterized in that the treated lignocellulose material is mixed with part of a non-treated lignocel-lulose material.