US3912836A - Procedure for surface treatment of wood - Google Patents

Procedure for surface treatment of wood Download PDF

Info

Publication number
US3912836A
US3912836A US354446A US35444673A US3912836A US 3912836 A US3912836 A US 3912836A US 354446 A US354446 A US 354446A US 35444673 A US35444673 A US 35444673A US 3912836 A US3912836 A US 3912836A
Authority
US
United States
Prior art keywords
wood
treatment
phenol
formaldehyde
pretreatment
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 - Lifetime
Application number
US354446A
Inventor
Karl Ingvar Georg Johansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from SE7205623A external-priority patent/SE400041B/en
Application filed by Individual filed Critical Individual
Priority to US354446A priority Critical patent/US3912836A/en
Application granted granted Critical
Publication of US3912836A publication Critical patent/US3912836A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
    • 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
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/28—Nitrogen-containing compounds
    • 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
    • C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols

Definitions

  • ABSTRACT Related Apphcatlon Daw A wood treatment involving pretreatment of the wood [63] continuationin'part of 351,161 Apfil surface with an agent facilitating penetration of im- 1973 abandoned pregnant into said surface, a pretreatment agent being I chosen in the form of a condensable or polymerisable, [3O] Forelg Apphcauon Pnonty Data hyrophilic substance in liquid form, which is free from Apr. 27, Sweden olvent and auses the wood to well or dissolves its constituents, with which substance the wood surface is U-S- pretreated and impregnated to a of a few Int.
  • the French Patent No. 2,1 13,481 relates to a procedure for surface treatment of wood, the surface layer of the .wood being pretreated with an agent which facilitates penetration of impregnant into the wood surface f
  • Characteristic of said patent is that as pretreatment agent is used a condensable or polymerizable, hydrophilic substance in liquid form, free from solventgcausing the wood to swell or dissolving wood constituents, with which substance the wood surface is pretreated and impregnated, preferentially to a depth of at most a few millimetres but even up to one-fifth of the thickness of the wood, after which the substance is caused to harden either by subsequent treatment with hardeners and heat treatment or by corresponding subsequent treatment with an agent which can be caused to react with the pretreatment agent under formation of a polymer.
  • the object of the present invention is to further develop said surface treatment procedure and to indicate treatment agents usable for industrial application.
  • the invention is characterized in that the pretreatment is done with a solution of formaldehyde and/or low molecular paraformaldehyde in phenol and/or substituted phenol, and in that the so pretreated wood is treated with acid or alkaline vapours for starting .of the hardening reaction, and that an, in itself, known heat treatment takes place, which may be combined with a likewise known mechanical treatment of the wood surface.
  • the pretreatment is done at elevated temperature, after which the hardening is done by subsequent treatment with ammonia in gaseous form and heating.
  • the pretreatment can be done at room temperature and to the pretreatment agent is added an ammonium salt of a strong acid, e.g. ammonium chloride or some other salt, e.g. AlCl which at room temperature does not appreciably affect the pretreatment agent but in the subsequent treatment is decomposed by heat and gives off gases, so that hardening of the pretreatment agent occurs.
  • a strong acid e.g. ammonium chloride or some other salt, e.g. AlCl
  • the pretreatment can be done at atmospheric pressure or a slight overpressure, the pretreatment agent being caused to penetrate preferentially into cell walls and cavities in the surface layer of the wood.
  • the pretreatment can be done at elevated pressure, the pretreatment agent being caused to penetrate more deeply, after which the hardening is done at elevated temperature.
  • EXAMPLE 1 Boards of pinewood are impregnated with a solution of formaldehyde in phenol in the proportion (weight) 1:1.8 obtained either through coalescence of paraformaldehyde and phenol or through absorption of gaseous formaldehyde in molten phenol at 60-l00C and at an overpressure of 1-5 kp/cm during 30-60 min.
  • the impregnation solution is tapped off and the impregnation container is filled with ammonia gas to an overpressure of 0.5-2 kp/cm during 30-60 min, after which the wood material is heated to -100C for l-4 hours. If a glossy surface of the material is desired, a hot pressing operation can finally be done, e.g.
  • the boards so treated which, dependent on the thickness of the wood, contain 10-20 plastic concentrated at the surface layer of the wood, have a very satisfactory hardness and abrasion resistance and can suitably be used as floor material.
  • EXAMPLE 2 Boards of spruce are impregnated with a solution of 1 part by weight formaldehyde in 1.8 parts by weight of a mixture of phenol and a halogenized phenol, e.g. p-chlorophenol, at 60-100C.
  • a solution of 1 part by weight formaldehyde in 1.8 parts by weight of a mixture of phenol and a halogenized phenol, e.g. p-chlorophenol, at 60-100C the boards are placed in a pressure cylinder of conventional type and subjected to a'slight overpressure of l-4 kp/cm
  • the pre-treatment solution is then pumped into the cylinder and the pressure is raisedto 10-15 kp/cm so that a quicker and deeper penetration of the wood material is obtained.
  • the remaining pretreatment agent is tapped out of the cylinder and, owing to the pressure applied in advance, the solution which has not penetrated into the cell walls is now pressed out of the wood, so obtaining an impregnation primarily of the cell walls.
  • the impregnation container is filled with ammonia gas to an overpressure of 0.5-2 kp/cm for 30-60 min. and the material is then heated to 80-100C for 1-4 hours. This produces a wood material containing 10-30 plastic with very good strength properties, an excellent dimensional stability and good fire resistance, which is suited for use under severe conditions out-of-doors.
  • EXAMPLE 3 Pieces of plywood are immersed in a solution of formaldehyde in phenol in the proportion 1:1.8, in which is dissolved 0.5-5 ammonium chloride. The pieces of wood are left to absorb the solution during 15-60 min. and are then taken up and heated in a heating furnace at 80-l00C for l-2 hours. The resulting product has a good abrasion resistance and ability to resist both water and alkali.
  • EXAMPLE 4 The surface chips for chipboards are sprayed with a solution of formaldehyde in phenol in the proportion 1:1.8 in which 0.5-5 ammonium formate has been dissolved.
  • the weight of added solution is 10-50 of the weight of the surface chips.
  • the spreading and compression of the surface chips are done in the conventional way at, for example C, 20 kp/cm and 5 min, and the resulting chipboard has considerably improved surface density properties.
  • EXAMPLE 5 Veneer is treated on both sides with a solution of formaldehyde in phenol as in the preceding example, is hardened and used as surface layer, possibly also intermediate layer, for the manufacture of plywood, which thereby acquires good abrasion resistance, excellent adhesion between the layers and good water repelling properties.
  • EXAMPLE 7 Dried plywood veneer is immersed in a solution of formaldehyde in phenol in the proportion 1:1.8 for 1-10 min at 0-2 kp/cm overpressure.
  • the sheets of veneer are prehardened in a heating furnace at 50l00C in an ammonia gas atmosphere for -6O min and are thereafter used in the conventional way as face veneer in plywood manufacture.
  • the resulting plywood product has an excellent surface hardness and abrasion resistance and good resistance to moisture and alkali.
  • a process for the surface-treatment of wood which comprises pretreating a wood substrate at a temperature between about 60lOOC. for about 1 to 2 hours with a hydrophilic liquid material, that is substantially free of any solvent and that causes the wood to swell or dissolves constituents of the wood, until the desired depth of penetration has been attained; said hydrophilic liquid material consisting of a condensable solution of formaldehyde in phenol in the weight ratio of about 1:1.8; and thereafter at a temperature between about 50and about 150C. treating the resulting pretreated wood with a condensing agent for a time sufficient to obtain a hardened condensate of said hydrophilic material in the form of an abrasion resistant surface.
  • a process for the surface-treatment of wood which comprises pretreating a wood substrate at room temperature with a hydrophilic liquid material, that is substantially free of any solvent and that causes the wood to swell or dissolves constituents of the wood, until the desired depth of penetration has been attained; said hydrophilic liquid material consisting of a condensable solution of formaldehyde and a heatdecomposable ammonium salt in phenol in which the weight ratio of formaldehyde to phenol is about 1:1.8; and thereafter heating the pretreated wood at a temperature of about to about C for a time sufficient to decompose the ammonium salt to ammonia and to obtain a hardened condensate of said hydrophilic material in the form of an abrasion resistant surface.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material 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)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

A wood treatment involving pretreatment of the wood surface with an agent facilitating penetration of impregnant into said surface, a pretreatment agent being chosen in the form of a condensable or polymerisable, hyrophilic substance in liquid form, which is free from solvent and causes the wood to swell or dissolves its constituents, with which substance the wood surface is pretreated and impregnated, to a depth of a few millimetres, after which the substance is caused to harden either by subsequent treatment with harderners and heat treatment or by corresponding subsequent treatment with an agent which can be caused to react with the pretreatment agent under formation of a polymer. The pretreatment takes place with a solution of formaldehyde and/or low molecular paraformaldehyde in phenol or substituted phenol, and the so pretreated wood is treated with acid or alkaline vapours for starting of hardening, and further a heat treatment is added which may be combined with a mechanical treatment of the wood surface.

Description

I United States Patent 1 1 1111 3,912,836
Johansson Oct. 14, 1975 [54] PROCEDURE FOR SURFACE TREATNIENT 2,674,543 4/1954 Iablokoff 117/59 0F WOOD 2,740,728 4/1956 Sonnabend etal. 117 59 2,947,648 8/1960 Sonnabend et al. ll7/59 Inventor: Karl lngvar Georg Johansson, 3,219,473 11/1965 Dimond 117/148 Spanga, Sweden 3,476,585 11/1969 Fraser 1 17/57 3, 4 ,679 1219 M [73] Assgneei Gustav 3,232,199 1i197 .leiil et al. 11 13 Valberg, Sweden [22] Filed: Apr. 25, 1973 Primary Examiner-Michael Sofocleous [21] Appl. No.: 354,446
[57] ABSTRACT Related Apphcatlon Daw A wood treatment involving pretreatment of the wood [63] continuationin'part of 351,161 Apfil surface with an agent facilitating penetration of im- 1973 abandoned pregnant into said surface, a pretreatment agent being I chosen in the form of a condensable or polymerisable, [3O] Forelg Apphcauon Pnonty Data hyrophilic substance in liquid form, which is free from Apr. 27, Sweden olvent and auses the wood to well or dissolves its constituents, with which substance the wood surface is U-S- pretreated and impregnated to a of a few Int. CL2 t H metres after the Substance is aused to harden Field of Search 117/148, 62; 427/317, 1 either by subsequent treatment with harderners and 427/341, 393, 397, 440 heat treatment or by corresponding subsequent treatment with an agent which can be caused to react with References Cited the pretreatment agent under formation of a polymer.
UNITED STATES PATENTS The pretreatment takes place with a solution of form- 2,114,784 4/1938 Maisch 117/57 aldehyde and/or low molecular Paraformaldehyde in 2 9 2 19 3 Booty er 117 59 phenol or substituted phenol, and the so pretreated 2,174,132 9/1939 Maisch 1 17/ 148 wood is treated with acid or alkaline vapours for start- 2 ,33(),826 10/1943 Hunn 117/148 ing of hardening, and further a heat treatment is 3 1 1944 stammm- 1 17/148 added which may be combined with a mechanical 2,352,740 7/1944 Shannon 117/59 treatment f the wood surface. 2,363,658 ll/l944 Decker ll7/l48 2,572,070 lO/l95l Stamm et al 1 17/57 5 Claims, N0 Drawings PROCEDURE FOR SURFACE TREATMENT O WOOD The present application is a continuatiori-in-part of my earlier application Ser. Number 351,161 filed Apr. 16, 1973 now abandoned. w
The French Patent No. 2,1 13,481 relates to a procedure for surface treatment of wood, the surface layer of the .wood being pretreated with an agent which facilitates penetration of impregnant into the wood surface f Characteristic of said patent is that as pretreatment agent is used a condensable or polymerizable, hydrophilic substance in liquid form, free from solventgcausing the wood to swell or dissolving wood constituents, with which substance the wood surface is pretreated and impregnated, preferentially to a depth of at most a few millimetres but even up to one-fifth of the thickness of the wood, after which the substance is caused to harden either by subsequent treatment with hardeners and heat treatment or by corresponding subsequent treatment with an agent which can be caused to react with the pretreatment agent under formation of a polymer.
The object of the present invention is to further develop said surface treatment procedure and to indicate treatment agents usable for industrial application.
The invention is characterized in that the pretreatment is done with a solution of formaldehyde and/or low molecular paraformaldehyde in phenol and/or substituted phenol, and in that the so pretreated wood is treated with acid or alkaline vapours for starting .of the hardening reaction, and that an, in itself, known heat treatment takes place, which may be combined with a likewise known mechanical treatment of the wood surface.
According to one embodiment the pretreatment is done at elevated temperature, after which the hardening is done by subsequent treatment with ammonia in gaseous form and heating.
Alternatively the pretreatment can be done at room temperature and to the pretreatment agent is added an ammonium salt of a strong acid, e.g. ammonium chloride or some other salt, e.g. AlCl which at room temperature does not appreciably affect the pretreatment agent but in the subsequent treatment is decomposed by heat and gives off gases, so that hardening of the pretreatment agent occurs.
The pretreatment can be done at atmospheric pressure or a slight overpressure, the pretreatment agent being caused to penetrate preferentially into cell walls and cavities in the surface layer of the wood. Alternatively the pretreatment can be done at elevated pressure, the pretreatment agent being caused to penetrate more deeply, after which the hardening is done at elevated temperature.
The invention will] now be explained in greater detail with reference to some embodiments.
EXAMPLE 1 Boards of pinewood are impregnated with a solution of formaldehyde in phenol in the proportion (weight) 1:1.8 obtained either through coalescence of paraformaldehyde and phenol or through absorption of gaseous formaldehyde in molten phenol at 60-l00C and at an overpressure of 1-5 kp/cm during 30-60 min. The impregnation solution is tapped off and the impregnation container is filled with ammonia gas to an overpressure of 0.5-2 kp/cm during 30-60 min, after which the wood material is heated to -100C for l-4 hours. If a glossy surface of the material is desired, a hot pressing operation can finally be done, e.g. at an overpressure of 2-10 kp/cm and C for l-lO min. The boards so treated, which, dependent on the thickness of the wood, contain 10-20 plastic concentrated at the surface layer of the wood, have a very satisfactory hardness and abrasion resistance and can suitably be used as floor material.
EXAMPLE 2 Boards of spruce are impregnated with a solution of 1 part by weight formaldehyde in 1.8 parts by weight of a mixture of phenol and a halogenized phenol, e.g. p-chlorophenol, at 60-100C. For this purpose the boards are placed in a pressure cylinder of conventional type and subjected to a'slight overpressure of l-4 kp/cm The pre-treatment solution is then pumped into the cylinder and the pressure is raisedto 10-15 kp/cm so that a quicker and deeper penetration of the wood material is obtained. After 0.5-3 hours the remaining pretreatment agent is tapped out of the cylinder and, owing to the pressure applied in advance, the solution which has not penetrated into the cell walls is now pressed out of the wood, so obtaining an impregnation primarily of the cell walls. Thereafter the impregnation container is filled with ammonia gas to an overpressure of 0.5-2 kp/cm for 30-60 min. and the material is then heated to 80-100C for 1-4 hours. This produces a wood material containing 10-30 plastic with very good strength properties, an excellent dimensional stability and good fire resistance, which is suited for use under severe conditions out-of-doors.
EXAMPLE 3 Pieces of plywood are immersed in a solution of formaldehyde in phenol in the proportion 1:1.8, in which is dissolved 0.5-5 ammonium chloride. The pieces of wood are left to absorb the solution during 15-60 min. and are then taken up and heated in a heating furnace at 80-l00C for l-2 hours. The resulting product has a good abrasion resistance and ability to resist both water and alkali.
EXAMPLE 4 The surface chips for chipboards are sprayed with a solution of formaldehyde in phenol in the proportion 1:1.8 in which 0.5-5 ammonium formate has been dissolved. The weight of added solution is 10-50 of the weight of the surface chips. The spreading and compression of the surface chips are done in the conventional way at, for example C, 20 kp/cm and 5 min, and the resulting chipboard has considerably improved surface density properties.
EXAMPLE 5 Veneer is treated on both sides with a solution of formaldehyde in phenol as in the preceding example, is hardened and used as surface layer, possibly also intermediate layer, for the manufacture of plywood, which thereby acquires good abrasion resistance, excellent adhesion between the layers and good water repelling properties.
EXAMPLE 6 Telegraph poles, fencing poles, railway sleepers or similar heavy timber, are impregnated with a solution of formaldehyde in phenol in the proportion 1:1.8 for 1-2 hours at 60100C and at an overpressure of 2-10 kp/cm Thereafter the impregnation solution is tapped off and the impregnation tank is filled with NH gas to an overpressure of 1-5 kp/cm at a temperature of 80l00C for 1-2 hours. The wood material so treated contains 5-15% plastic to a depth of 5-15 mm, which gives it an excellent surface hardness, a good rotproofness and an improved flexural strength. The thickness of the treated surface layer permits, for example, the use of climbers on telegraph poles treated in this way without breaking through the resulting surface layer.
EXAMPLE 7 Dried plywood veneer is immersed in a solution of formaldehyde in phenol in the proportion 1:1.8 for 1-10 min at 0-2 kp/cm overpressure. The sheets of veneer are prehardened in a heating furnace at 50l00C in an ammonia gas atmosphere for -6O min and are thereafter used in the conventional way as face veneer in plywood manufacture. The resulting plywood product has an excellent surface hardness and abrasion resistance and good resistance to moisture and alkali.
What is claimed is:
l. A process for the surface-treatment of wood, which comprises pretreating a wood substrate at a temperature between about 60lOOC. for about 1 to 2 hours with a hydrophilic liquid material, that is substantially free of any solvent and that causes the wood to swell or dissolves constituents of the wood, until the desired depth of penetration has been attained; said hydrophilic liquid material consisting of a condensable solution of formaldehyde in phenol in the weight ratio of about 1:1.8; and thereafter at a temperature between about 50and about 150C. treating the resulting pretreated wood with a condensing agent for a time sufficient to obtain a hardened condensate of said hydrophilic material in the form of an abrasion resistant surface.
2. A process according to claim 1, in which the treating agent is gaseous ammonia.
3. A process according to claim 1, in which the formaldehyde is present as paraformaldehyde.
4. A process for the surface-treatment of wood, which comprises pretreating a wood substrate at room temperature with a hydrophilic liquid material, that is substantially free of any solvent and that causes the wood to swell or dissolves constituents of the wood, until the desired depth of penetration has been attained; said hydrophilic liquid material consisting of a condensable solution of formaldehyde and a heatdecomposable ammonium salt in phenol in which the weight ratio of formaldehyde to phenol is about 1:1.8; and thereafter heating the pretreated wood at a temperature of about to about C for a time sufficient to decompose the ammonium salt to ammonia and to obtain a hardened condensate of said hydrophilic material in the form of an abrasion resistant surface.
5. A process according to claim 4, in which the heatdecomposable ammonium salt comprises ammonium chloride.

Claims (5)

1. A PROCESS FOR THE SURFACE-TREATMENT OF WOOD, WHICH COMPRISES PRETRETING A WOOD SUBSTRATE AT A TEMPERATURE BETWEEN ABOUT 60*-100*C. FOR ABOUT 1 TO 2 HOURS WITH A HYDROPHILIC LIQUID MATERIAL, THAT IS SUBSTANTIALLY FREE OF ANY SOLVENT AND THAT CAUSES THE WOOD TO SWELL OR DISSOLVES CONSTITUENTS OF THE WOOD, UNTIL THE DESIRED DEPTH OF PENETRATION HAS BEEN ATTAINED, SAID HYDROPHILIC LIQUID MATERIAL CONSISTING OF A CONDENSABLE SOLUTION OF FRMALDEHYDE IN PHENOL IN THE WEIGHT RATIO OF ABOUT 1:1.8, AND THEREAFTER AT A TEMPERATURE BETWEEN ABOUT 50* AND ABOUT 150*C. TREATING THE RESULTING PRETREATED WOOD WITH A CONDENSING AGENT FOR A TIME SUFFICIENT TO OBTAIN A HARDENED CONDENSATE OF SAID HYDROPHILIC MATERIAL IN THE FORM OF AN ABRASION RESISTANT SURFACE.
2. A process according to claim 1, in which the treating agent is gaseous ammonia.
3. A process according to claim 1, in which the formaldehyde is present as paraformaldehyde.
4. A process for the surface-treatment of wood, which comprises pretreating a wood substrate at room temperature with a hydrophilic liquid material, that is substantially free of any solvent and that causes the wood to swell or dissolves constituents of the wood, until the desired depth of penetration has been attained; said hydrophilic liquid material consisting of a condensable solution of formaldehyde and a heat-decomposable ammonium salt in phenol in which the weight ratio of formaldehyde to phenol is about 1:1.8; and thereafter heating the pretreated wood at a temperature of about 80*to about 150*C for a time sufficient to decompose the ammonium salt to ammonia and to obtain a hardened condensate of said hydrophilic material in the form of an abrasion resistant surface.
5. A process according to claim 4, in which the heat-decomposable ammonium salt comprises ammonium chloride.
US354446A 1972-04-27 1973-04-25 Procedure for surface treatment of wood Expired - Lifetime US3912836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US354446A US3912836A (en) 1972-04-27 1973-04-25 Procedure for surface treatment of wood

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE7205623A SE400041B (en) 1972-04-27 1972-04-27 PROCEDURE FOR SURFACE TREATMENT OF WOOD BY SURFACE IMPREGNATION AND HARDENING OF A PLASTIC COAT
US35116173A 1973-04-16 1973-04-16
US354446A US3912836A (en) 1972-04-27 1973-04-25 Procedure for surface treatment of wood

Publications (1)

Publication Number Publication Date
US3912836A true US3912836A (en) 1975-10-14

Family

ID=27354398

Family Applications (1)

Application Number Title Priority Date Filing Date
US354446A Expired - Lifetime US3912836A (en) 1972-04-27 1973-04-25 Procedure for surface treatment of wood

Country Status (1)

Country Link
US (1) US3912836A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2631881A1 (en) * 1988-05-25 1989-12-01 Ikeda Nobuo
US20080003902A1 (en) * 2006-06-30 2008-01-03 Georgia-Pacific Resins, Inc. Reducing formaldehyde emissions from fiberglass insulation
US20080038971A1 (en) * 2006-06-09 2008-02-14 Georgia-Pacific Chemicals Llc Fibrous mats having reduced formaldehyde emissions
US20080138526A1 (en) * 2006-06-09 2008-06-12 Georgia-Pacific Chemicals Llc Porous fiberglass materials having reduced formaldehyde emissions
US20080233334A1 (en) * 2007-03-21 2008-09-25 Georgia-Pacific Chemicals Llc Fibrous products having reduced formaldehyde emissions
US20080233333A1 (en) * 2007-03-21 2008-09-25 Georgia-Pacific Chemicals Llc Fibrous products having reduced formaldehyde emissions
US20080286472A1 (en) * 2006-06-30 2008-11-20 Georgia-Pacific Chemicals Llc Reducing formaldehyde emissions

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114784A (en) * 1935-01-31 1938-04-19 Firm Hermann Frenkel Covering wood with resistant coatings
US2140981A (en) * 1935-04-11 1938-12-20 Philip C P Booty Process of impregnating wood and the like
US2174132A (en) * 1937-11-17 1939-09-26 Firm Hermann Frenkel Producing resistant varnish coatings on wood
US2330826A (en) * 1940-07-22 1943-10-05 Sherwin Williams Co Manufacture of resin-surfaced wood
US2350135A (en) * 1942-11-16 1944-05-30 Claude R Wickard Wood impregnation
US2352740A (en) * 1940-05-14 1944-07-04 Bakelite Corp Method of impregnating bamboo with synthetic resin
US2363658A (en) * 1942-03-27 1944-11-28 Du Pont Finishing system
US2572070A (en) * 1945-03-27 1951-10-23 Alfred J Stamm Method of stabilizing wood
US2674543A (en) * 1948-03-05 1954-04-06 Onera (Off Nat Aerospatiale) Process for treating wood and resulting article
US2740728A (en) * 1954-01-25 1956-04-03 Dow Chemical Co Production of resin-impregnated porous bodies
US2947648A (en) * 1955-12-21 1960-08-02 Dow Chemical Co Resinification of wood
US3219473A (en) * 1964-12-29 1965-11-23 Gen Plywood Corp Method of coating and smoothing wood surface
US3476585A (en) * 1966-10-17 1969-11-04 Weyerhaeuser Co Process of forming coated wood products
US3547679A (en) * 1966-08-26 1970-12-15 Mo Och Domsjoe Ab Dimensionally stabilized wood and method of making such wood
US3636199A (en) * 1969-02-04 1972-01-18 Allied Chem Synthetic board inlaid with moisture-cure urethane and method therefor

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114784A (en) * 1935-01-31 1938-04-19 Firm Hermann Frenkel Covering wood with resistant coatings
US2140981A (en) * 1935-04-11 1938-12-20 Philip C P Booty Process of impregnating wood and the like
US2174132A (en) * 1937-11-17 1939-09-26 Firm Hermann Frenkel Producing resistant varnish coatings on wood
US2352740A (en) * 1940-05-14 1944-07-04 Bakelite Corp Method of impregnating bamboo with synthetic resin
US2330826A (en) * 1940-07-22 1943-10-05 Sherwin Williams Co Manufacture of resin-surfaced wood
US2363658A (en) * 1942-03-27 1944-11-28 Du Pont Finishing system
US2350135A (en) * 1942-11-16 1944-05-30 Claude R Wickard Wood impregnation
US2572070A (en) * 1945-03-27 1951-10-23 Alfred J Stamm Method of stabilizing wood
US2674543A (en) * 1948-03-05 1954-04-06 Onera (Off Nat Aerospatiale) Process for treating wood and resulting article
US2740728A (en) * 1954-01-25 1956-04-03 Dow Chemical Co Production of resin-impregnated porous bodies
US2947648A (en) * 1955-12-21 1960-08-02 Dow Chemical Co Resinification of wood
US3219473A (en) * 1964-12-29 1965-11-23 Gen Plywood Corp Method of coating and smoothing wood surface
US3547679A (en) * 1966-08-26 1970-12-15 Mo Och Domsjoe Ab Dimensionally stabilized wood and method of making such wood
US3476585A (en) * 1966-10-17 1969-11-04 Weyerhaeuser Co Process of forming coated wood products
US3636199A (en) * 1969-02-04 1972-01-18 Allied Chem Synthetic board inlaid with moisture-cure urethane and method therefor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2631881A1 (en) * 1988-05-25 1989-12-01 Ikeda Nobuo
US20080038971A1 (en) * 2006-06-09 2008-02-14 Georgia-Pacific Chemicals Llc Fibrous mats having reduced formaldehyde emissions
US20080138526A1 (en) * 2006-06-09 2008-06-12 Georgia-Pacific Chemicals Llc Porous fiberglass materials having reduced formaldehyde emissions
US8173219B2 (en) 2006-06-09 2012-05-08 Georgia-Pacific Chemicals Llc Porous fiberglass materials having reduced formaldehyde emissions
US20080003902A1 (en) * 2006-06-30 2008-01-03 Georgia-Pacific Resins, Inc. Reducing formaldehyde emissions from fiberglass insulation
US20080286472A1 (en) * 2006-06-30 2008-11-20 Georgia-Pacific Chemicals Llc Reducing formaldehyde emissions
US7989367B2 (en) 2006-06-30 2011-08-02 Georgia-Pacific Chemicals Llc Reducing formaldehyde emissions from fiberglass insulation
US8043383B2 (en) 2006-06-30 2011-10-25 Georgia-Pacific Chemicals Llc Reducing formaldehyde emissions
US20080233334A1 (en) * 2007-03-21 2008-09-25 Georgia-Pacific Chemicals Llc Fibrous products having reduced formaldehyde emissions
US20080233333A1 (en) * 2007-03-21 2008-09-25 Georgia-Pacific Chemicals Llc Fibrous products having reduced formaldehyde emissions

Similar Documents

Publication Publication Date Title
Li et al. Preparation and characterization of sodium silicate impregnated Chinese fir wood with high strength, water resistance, flame retardant and smoke suppression
JP4496408B2 (en) Method for improving the surface hardness of a wood molded body using an aqueous solution of an impregnating agent
US3912836A (en) Procedure for surface treatment of wood
US2313953A (en) Process for resinifying lignocellulosic materials
US2740728A (en) Production of resin-impregnated porous bodies
CN1439499A (en) Composition, preparation thereof and its application in post-treatment of wood
US949671A (en) Method of indurating fibrous and cellular material.
JP3572323B1 (en) Processing method of thinned wood
US2947648A (en) Resinification of wood
CN1267259C (en) Wood densification method by impregnating resin
FI59746C (en) FOERFARANDE FOER YTBEHANDLING AV TRAE
US942852A (en) Indurated product and method of preparing same.
US3892896A (en) Procedure for surface treatment of wood
US1905225A (en) Art of compressed laminated products
CN110757605B (en) Method for modifying artificial forest wood by phenol-aldehyde impregnation
JPS62116106A (en) Improved wood
RU2811112C1 (en) Method of manufacturing product from dense wood
JPH0647712A (en) Composition for modifying wood
JPH0663907A (en) Manufacture of modified wood
JP2611916B2 (en) Method of manufacturing resin-treated wood
JPH04216045A (en) Decorative panel and manufacture thereof
JP2000071208A (en) Method for modifying surface performance quality of wood material and wood material with surface performance quality modified by this method
US1016111A (en) Process of preserving and hardening wood.
JPH04216046A (en) Decorative panel and manufacture thereof
JPH04336203A (en) Manufacture of modified lumber