GB1028394A - Bonding porous particles - Google Patents
Bonding porous particlesInfo
- Publication number
- GB1028394A GB1028394A GB803964A GB803964A GB1028394A GB 1028394 A GB1028394 A GB 1028394A GB 803964 A GB803964 A GB 803964A GB 803964 A GB803964 A GB 803964A GB 1028394 A GB1028394 A GB 1028394A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wood
- resin
- particles
- catalyst
- followed
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
Water-penetrable cellulosic particles or fibres or sheets are bonded by applying to them an aqueous solution of an acid or acid salt of pKa less than 5.5, followed by an aqueous solution of a urea-formaldehyde resin, then forming, pressing and heat-curing the mass in the desired shape. The resin amounts to 3-15% by weight of the particles, and the catalyst, usually, to 0.1-1%. The resin may comprise 5-50% by weight of a melamine-formaldehyde resin, and usually contains a part of the catalyst, preferably 0.5 to 1.5 parts per 100 of resin of an acidic salt, e.g. NH4Cl, (NH4)2SO4. The remainder of the catalyst is applied to the particles as the pretreatment. Suitable acids and salts are acetic, phosphoric, hydrochloric, sulphuric, nitric, chloracetic, and oxalic acids, and ammonium nitrate, chloride, sulphate, and silicofluoride. The preferred particles are wood flakes, but may be paper stock, veneers-for plywood, wood flour-for moulding compositions, or rag fibres. In examples, catalysts are sprayed as 10% solutions in amounts of 0.1 or 0.2 parts per 100 of wood on to wood chips, followed by a urea-formaldehyde resin solution in amount 7 parts per 100 of wood, and from the mixture board is made by pressing at 375 p.s.i., followed by cure at 290 DEG C. and 350 p.s.i.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB803964A GB1028394A (en) | 1964-02-26 | 1964-02-26 | Bonding porous particles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB803964A GB1028394A (en) | 1964-02-26 | 1964-02-26 | Bonding porous particles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1028394A true GB1028394A (en) | 1966-05-04 |
Family
ID=9844607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB803964A Expired GB1028394A (en) | 1964-02-26 | 1964-02-26 | Bonding porous particles |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1028394A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013113080A1 (en) * | 2012-01-31 | 2013-08-08 | Gratz Livia Bastos | Method for producing a composite from triturated paper money, and composite |
-
1964
- 1964-02-26 GB GB803964A patent/GB1028394A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013113080A1 (en) * | 2012-01-31 | 2013-08-08 | Gratz Livia Bastos | Method for producing a composite from triturated paper money, and composite |
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