GB922674A - Improvements in and relating to the impregnation of wood-fibre board - Google Patents
Improvements in and relating to the impregnation of wood-fibre boardInfo
- Publication number
- GB922674A GB922674A GB3745461A GB3745461A GB922674A GB 922674 A GB922674 A GB 922674A GB 3745461 A GB3745461 A GB 3745461A GB 3745461 A GB3745461 A GB 3745461A GB 922674 A GB922674 A GB 922674A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carbamide
- effected
- cellulose
- molar ratio
- treated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/0002—Flame-resistant papers; (complex) compositions rendering paper fire-resistant
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/07—Nitrogen-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/10—Phosphorus-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/34—Ignifugeants
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J1/00—Fibreboard
- D21J1/08—Impregnated or coated fibreboard
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
Landscapes
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
Wood-fibre boards, especially hardboard, are impregnated with at least 40 of their volume of an aqueous solution containing at least 65% by weight of a mixture of carbamide, an inorganic phosphate capable of esterifying the cellulose, and phosphoric acid, the molar ratio of the carbamide to the total phosphorus compound content being at least 4:1, and subsequently heat-treated to esterify the cellulose. A suitable inorganic phosphate is ammonium dihydrogen phosphate, and the molar ratio of carbamide to total phosphorus compounds is preferably at least 6:1, but not more than about 10:1. The impregnation step may be effected by vacuum or pressure. Heat-treatment may be effected at 100 DEG -140 DEG C. for 1-3 hours, and should be such that on leaching the treated boards with water at least 95% of the chemicals impregnated are retained. Treatment enhances the fire-resistance of the materials without adversely affecting their strength.ALSO:Wood-fibre boards, especially hardboard, are fireproofed by impregnation with at least 40% of their volume of an aqueous solution containing at least 65% by weight of a mixture of carbamide, an inorganic phosphate capable of esterifying the cellulose, and phosphoric acid, the molar ratio of the carbamide to the total phosphorus compound content being at least 4:1, and subsequently heat-treated to esterify the cellulose. A suitable inorganic phosphate is ammonium dihydrogen phosphate, and the molar ratio of carbamide to total phosphorus compounds is preferably at least 6:1, but not more than about 10:1. The impregnation step may be effected by vacuum or pressure. Heattreatment may be effected at 100 DEG -140 DEG C. for 1-3 hours, and should be such that on leaching the treated boards with water at least 95% of the chemicals impregnated are retained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1032160 | 1960-10-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB922674A true GB922674A (en) | 1963-04-03 |
Family
ID=20292129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3745461A Expired GB922674A (en) | 1960-10-27 | 1961-10-19 | Improvements in and relating to the impregnation of wood-fibre board |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB922674A (en) |
-
1961
- 1961-10-19 GB GB3745461A patent/GB922674A/en not_active Expired
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