US2166954A - Bleaching of wood - Google Patents

Bleaching of wood Download PDF

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Publication number
US2166954A
US2166954A US142067A US14206737A US2166954A US 2166954 A US2166954 A US 2166954A US 142067 A US142067 A US 142067A US 14206737 A US14206737 A US 14206737A US 2166954 A US2166954 A US 2166954A
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US
United States
Prior art keywords
wood
bleaching
solution
alkali
peroxide
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
US142067A
Inventor
Hans O Kauffmann
Robert L Mcewen
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.)
BUFFALO ELECTRO CHEM CO
BUFFALO ELECTRO-CHEMICAL COMPANY Inc
Original Assignee
BUFFALO ELECTRO CHEM CO
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
Application filed by BUFFALO ELECTRO CHEM CO filed Critical BUFFALO ELECTRO CHEM CO
Priority to US142067A priority Critical patent/US2166954A/en
Application granted granted Critical
Publication of US2166954A publication Critical patent/US2166954A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/02—Staining or dyeing wood; Bleaching wood
    • 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
    • B27K3/34—Organic impregnating agents
    • B27K3/50—Mixtures of different organic impregnating agents

Definitions

  • the present invention relates to the bleaching of wood and more particularly to the bleaching of wood with hydrogen peroxide and an alcoholic solution of an alkali.
  • the article of wood to be bleached is treated with a solution containing or generating hydrogen peroxide.
  • the peroxide solution is sprayed or brushed upon the article in amounts suflicient to bleach the same or the article dipped or immersed in the peroxide solution.
  • the particular mode of applying the solution will depend upon the type of article to be treated, that is, whether the same be in the form of veneer strips or heavier shaped and formed articles, and upon the type of wood, whether hard or soft wood and whether the same be seasoned or sap laden.
  • the wood is subject to vacuum, pressure, heat or other conventional procedure and immersed in the peroxide to obtain substantially complete impregnation:
  • the hydrogen peroxide may be commercial grades of hydrogen peroxide, such as, 100 volume peroxide, or may be 10 to 100 volume, or the oxidizing solution may contain materials generating hydrogen peroxide in solution such as the perborates, percarbonates and the like and the alkali metal peroxides and such materials are comprised by the term hydrogen peroxide.
  • the wood is also treated with an alcoholic solution of an alkali.
  • an alcoholic solution of an alkali comprises any of the water soluble alcohols capable of dissolving an alkali, as for instance, methyl or ethyl alcohol, the quantity of alkali dissolved therein depending upon the kind of alkali and alcohol
  • the alkali will be caustic soda, although other caustic alkalis may be employed, such as caustic potash and the like, and
  • alcoholic solutions of ammonia will also serve. Suitable solutions may be obtained by dissolving alkali metals in the alcohol. The caustic alkali is generally dissolved to the extent of 3-12% although saturated solutions may be employed. Likewise, saturated solutions of ammonia in the alcohol are recommended although about a 4% water added to the wood and reduces the time required to eliminate the added water and reduces the moisture content of the wood to substantially that of the untreated woody article.
  • the alcoholic alkali may be added prior to, concurrent with or subse uent to the p'fdidde treatment, provided tha the peroxide or alkali is not lost.
  • the woody article may be dipped or immersed in the peroxide solution and the alcoholic alkali then sprayed r br ushed upon the so-treated portions wl rereby the peroxide is activated and thewood bleached. Rapid evaporation of the alcohol occurs leaving a bleached wood surface.
  • the method of bleaching wood which comprises treating the wood with a solution containing a peroxide and an alcoholic solution of an alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
  • the method of bleaching wood which comprises applying to the wood a solution of hydrogen peroxide and an alcoholic solution of an alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
  • the method of bleaching wood which comprises applying to the wood a solution of hydrogen peroxide and thereafter an alcoholic solution of an alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
  • the method of bleaching wood which comprises treating the wood with a solution containing a peroxide and an alcoholic solution of a' caustic alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
  • the method of bleaching wood which comprises treating the wood with a solution containing hydrogen peroxide and an alcoholic solution of ammonia and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.

Description

' employed.
UNITED STATES PATENT OFFICE BLEACHING 0F WOOD No Drawing. Application May 11, 1937, Serial No. 142,067
5 Claims.
The present invention relates to the bleaching of wood and more particularly to the bleaching of wood with hydrogen peroxide and an alcoholic solution of an alkali.
In accordance with the procedures of the present invention the article of wood to be bleached is treated with a solution containing or generating hydrogen peroxide. To this end the peroxide solution is sprayed or brushed upon the article in amounts suflicient to bleach the same or the article dipped or immersed in the peroxide solution. The particular mode of applying the solution will depend upon the type of article to be treated, that is, whether the same be in the form of veneer strips or heavier shaped and formed articles, and upon the type of wood, whether hard or soft wood and whether the same be seasoned or sap laden. Where it is desired to bleach the wood substantially throughout, the wood is subject to vacuum, pressure, heat or other conventional procedure and immersed in the peroxide to obtain substantially complete impregnation:
The hydrogen peroxide may be commercial grades of hydrogen peroxide, such as, 100 volume peroxide, or may be 10 to 100 volume, or the oxidizing solution may contain materials generating hydrogen peroxide in solution such as the perborates, percarbonates and the like and the alkali metal peroxides and such materials are comprised by the term hydrogen peroxide.
The wood is also treated with an alcoholic solution of an alkali. Such solution comprises any of the water soluble alcohols capable of dissolving an alkali, as for instance, methyl or ethyl alcohol, the quantity of alkali dissolved therein depending upon the kind of alkali and alcohol In general the alkali will be caustic soda, although other caustic alkalis may be employed, such as caustic potash and the like, and
alcoholic solutions of ammonia will also serve. Suitable solutions may be obtained by dissolving alkali metals in the alcohol. The caustic alkali is generally dissolved to the extent of 3-12% although saturated solutions may be employed. Likewise, saturated solutions of ammonia in the alcohol are recommended although about a 4% water added to the wood and reduces the time required to eliminate the added water and reduces the moisture content of the wood to substantially that of the untreated woody article.
The alcoholic alkali may be added prior to, concurrent with or subse uent to the p'fdidde treatment, provided tha the peroxide or alkali is not lost. Thus, the woody article may be dipped or immersed in the peroxide solution and the alcoholic alkali then sprayed r br ushed upon the so-treated portions wl rereby the peroxide is activated and thewood bleached. Rapid evaporation of the alcohol occurs leaving a bleached wood surface.
We claim as our invention:
1. The method of bleaching wood which comprises treating the wood with a solution containing a peroxide and an alcoholic solution of an alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
2. The method of bleaching wood which comprises applying to the wood a solution of hydrogen peroxide and an alcoholic solution of an alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
3. The method of bleaching wood which comprises applying to the wood a solution of hydrogen peroxide and thereafter an alcoholic solution of an alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
4. The method of bleaching wood which comprises treating the wood with a solution containing a peroxide and an alcoholic solution of a' caustic alkali and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
5. The method of bleaching wood which comprises treating the wood with a solution containing hydrogen peroxide and an alcoholic solution of ammonia and permitting the alcohol to evaporate from the wood whereby the concentration of bleaching agent in the solution in the wood is increased and bleaching facilitated.
HANS O. KAUFFMANN. ROBERT L. MCEWEN.
US142067A 1937-05-11 1937-05-11 Bleaching of wood Expired - Lifetime US2166954A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US142067A US2166954A (en) 1937-05-11 1937-05-11 Bleaching of wood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US142067A US2166954A (en) 1937-05-11 1937-05-11 Bleaching of wood

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US2166954A true US2166954A (en) 1939-07-25

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612898A (en) * 1952-10-07 Cleaning of manufactured jewelry
US3017236A (en) * 1959-08-14 1962-01-16 Du Pont Hydrogen peroxide-alkali metal bicarbonate acidic bleaching process
US3034851A (en) * 1956-10-01 1962-05-15 Du Pont Hydrogen peroxide-ammonium bicarbonate acidic bleaching composition and process
US3144297A (en) * 1961-07-25 1964-08-11 Reliance Universal Bleaching composition containing hydrogen peroxide and method of bleaching colored wood

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612898A (en) * 1952-10-07 Cleaning of manufactured jewelry
US3034851A (en) * 1956-10-01 1962-05-15 Du Pont Hydrogen peroxide-ammonium bicarbonate acidic bleaching composition and process
US3017236A (en) * 1959-08-14 1962-01-16 Du Pont Hydrogen peroxide-alkali metal bicarbonate acidic bleaching process
US3144297A (en) * 1961-07-25 1964-08-11 Reliance Universal Bleaching composition containing hydrogen peroxide and method of bleaching colored wood

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