EP0499076B1 - Lösemittel für Agentien zur umweltfreundlichen Massenentsäuerung von Büchern und anderen Papiererzeugnissen - Google Patents

Lösemittel für Agentien zur umweltfreundlichen Massenentsäuerung von Büchern und anderen Papiererzeugnissen Download PDF

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Publication number
EP0499076B1
EP0499076B1 EP92101209A EP92101209A EP0499076B1 EP 0499076 B1 EP0499076 B1 EP 0499076B1 EP 92101209 A EP92101209 A EP 92101209A EP 92101209 A EP92101209 A EP 92101209A EP 0499076 B1 EP0499076 B1 EP 0499076B1
Authority
EP
European Patent Office
Prior art keywords
books
paper
solvent
book
solvents
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
EP92101209A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0499076A1 (de
Inventor
Jürgen Dipl.-Ing. Wittekind
Peter Dipl.-Ing. Schwerdt
Rolf Dipl.-Ing. Eggersdorfer
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.)
Zfb Zentrum Fur Bucherhaltung GmbH
Original Assignee
Battelle Ingenieurtechnik GmbH
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 Battelle Ingenieurtechnik GmbH filed Critical Battelle Ingenieurtechnik GmbH
Publication of EP0499076A1 publication Critical patent/EP0499076A1/de
Application granted granted Critical
Publication of EP0499076B1 publication Critical patent/EP0499076B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/18—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00 of old paper as in books, documents, e.g. restoring

Definitions

  • the invention relates to solvents for agents in the form of neutralizing agents for the efficient mass deacidification of books, printed and other paper products as well as all types of archives such as magazines, files or documents.
  • the books for deacidification are treated with vapors of metal alkyls, for example with vapors of diethyl zinc (US Pat. No. 3,969,549).
  • the moisture in the paper transforms the metal alkyls into the oxides of the metals, eg in zinc oxide, which remains in the paper and neutralizes the free acids.
  • This process is to be regarded as a "dry” process, which means that the books only come into contact with the vapors of the metal alkyls and are therefore not soaked in a liquid.
  • the metal alkyls suitable for this purpose are self-igniting substances in the air, which represent a great fire and explosion risk potential and require an extreme degree of care and complex safety measures to avoid serious accidents.
  • the books are treated with solutions of an organometallic compound, such as, for example, methyl magnesium carbonate, in a suitable solvent, such as the solvents mentioned below.
  • organometallic compound such as, for example, methyl magnesium carbonate
  • the moisture in the paper in turn converts it to magnesium oxide and magnesium carbonate, both of which are able to neutralize the acids in the paper.
  • this process soaks the books with a solution.
  • this process In addition to the main task already mentioned, namely deacidification of the books, this process also achieves washing away of dust and dirt particles similar to the chemical cleaning of textiles. In addition to the safety of this process, this is another great advantage.
  • the solvents used for deacidification must not attack or damage the paper or the tools used in book production in any way. Since after the deacidification of the books the solvents are removed from the books in a drying process, the solvents have to evaporate at temperatures at which the books are not damaged yet.
  • Fluorocarbons and chlorofluorocarbons (CFCs) with the addition of alcohols such as e.g. Methanol or ethanol is used.
  • the fluorocarbons and chlorofluorocarbons mentioned have sufficient compatibility with most book materials and evaporate at temperatures at which the one does not yet experience excessive evaporation losses during handling, and secondly the books are not yet damaged.
  • DE-A-39 04 111 describes a process for environmentally friendly mass deacidification of books and other paper products, in which emissions are largely avoided by a closed procedure and by consistent exhaust air purification.
  • fluorocarbons or chlorofluorocarbons will no longer be available in the foreseeable future due to a ban on use and / or as a result of the voluntary cessation of production, the effective, suitable, safe and rational process for this, suitable examples that are initially considered, are missing.
  • the invention is therefore based on the object of specifying new solvents which are suitable for the mass deacidification of paper products and permit their deacidification with the greatest possible protection of the products and avoiding polluting substances.
  • organosiloxanes have similarly good solvent properties for book deacidification as the previously used chlorofluorocarbons, without having the environmental problems of these substances and, moreover, can also be used very well in the proposed rational processes.
  • the novelty consists in particular in the knowledge according to the invention that the specific siloxanes with 2 to 4 units (also called siloxane units) each having 2 to 4 units (also called siloxane units) make these siloxanes particularly suitable as solvents for book acidification.
  • CH3 groups can also occur, the compounds then having a particularly high chemical stability.
  • hydrogen atoms or functional groups which can react with the paper fiber can take the place of the x or R atoms.
  • the structure of the paper fiber can be positively influenced and re-consolidation of already damaged paper can thus be achieved.
  • these siloxanes are not suitable for the intended application, since unacceptably high temperatures would have to be used for drying the books even in a vacuum.
  • methylsiloxanes with 2-4 silicon atoms or silicon atom units have boiling points of 100-150 ° C at atmospheric pressure and viscosities from 0.65 mm2 / s to 1 mm2 / s.
  • these siloxanes have proven in experiments to be excellent solvents for book deacidification.
  • the substances mentioned are colorless, odorless liquids with very low viscosity and very low surface tension, which can be evaporated without residue at comparatively low temperatures.
  • the low viscosity and surface tension make these compounds particularly suitable for the purpose mentioned, since this enables good and uniform impregnation of the books.
  • the boiling point of the latter compound which at 150 ° C is already too high for a gentle treatment of books, can be reduced by applying a vacuum when drying the books, as is often the case in the art and also in the art DE-A-39 04 111 is specified, can be reduced to about 70 ° C at about 100 mbar.
  • Siloxanes of the type mentioned are compatible with many other solvents, e.g. Alcohols, which are used as solubilizers for methyl magnesium carbonate and to stabilize it, are miscible and are good solvents for many organometallic compounds, while the common materials and auxiliaries used for book production, e.g. Printing inks, glue and adhesives, plastics for cover covers, as well as inks and stamping inks, can neither be loosened nor damaged in any other way by siloxanes.
  • solvents e.g. Alcohols, which are used as solubilizers for methyl magnesium carbonate and to stabilize it, are miscible and are good solvents for many organometallic compounds, while the common materials and auxiliaries used for book production, e.g. Printing inks, glue and adhesives, plastics for cover covers, as well as inks and stamping inks, can neither be loosened nor damaged in any other way by siloxanes.
  • Rubber unless it is a special type of rubber - is destroyed by mineral oils and solvents such as petroleum hydrocarbons, aromatics, esters and alcohols or experiences a strong swelling due to these substances, whereas polysiloxanes of the type mentioned are excellent lubricants and care agents for rubber represent.
  • the heatability of a substance in the microwave field is essentially dependent on its dielectric constant ⁇ r and the dielectric loss factor tan ⁇ , both of which are specific properties of the substance are dependent; the higher these values are, the better the material can be heated in the microwave field.
  • the solvents according to the invention are therefore just as suitable as the previous solvents for use in rational processes of the type mentioned with microwave drying. However, it is also possible to use it in other conventional drying processes that do not use microwaves.
  • siloxanes according to the invention are very suitable for the known neutralizing agent methyl magnesium carbonate. However, they can also be used for other organometallic compounds which may be determined in the future and which in some way turn out to be an effective treatment agent for mass deacidification.
  • Methyl magnesium carbonate solution Magnethyl magnesium carbonate solution (magnesium content 3%, dissolved in alcohol and 87.5 g hexamethyldisiloxane was used instead of the usual CFC solvent for deacidification.
  • the pH value of 4.5 of the untreated paper could be increased to 8.5
  • the free acids in the paper were neutralized, at the same time an alkaline buffer reserve was introduced into the paper, and no damage to the paper or the lettering was observed.
EP92101209A 1991-02-14 1992-01-25 Lösemittel für Agentien zur umweltfreundlichen Massenentsäuerung von Büchern und anderen Papiererzeugnissen Expired - Lifetime EP0499076B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4104515A DE4104515C1 (enrdf_load_html_response) 1991-02-14 1991-02-14
DE4104515 1991-02-14

Publications (2)

Publication Number Publication Date
EP0499076A1 EP0499076A1 (de) 1992-08-19
EP0499076B1 true EP0499076B1 (de) 1995-08-02

Family

ID=6425050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92101209A Expired - Lifetime EP0499076B1 (de) 1991-02-14 1992-01-25 Lösemittel für Agentien zur umweltfreundlichen Massenentsäuerung von Büchern und anderen Papiererzeugnissen

Country Status (6)

Country Link
EP (1) EP0499076B1 (enrdf_load_html_response)
JP (1) JPH0693245A (enrdf_load_html_response)
AT (1) ATE125896T1 (enrdf_load_html_response)
CA (1) CA2060926C (enrdf_load_html_response)
DE (2) DE4104515C1 (enrdf_load_html_response)
ES (1) ES2077885T3 (enrdf_load_html_response)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4225780C1 (de) * 1992-08-04 1994-01-05 Battelle Institut E V Verfahren zur Wiederverfestigung von geschädigtem Papier
KR20010070082A (ko) * 2000-01-10 2001-07-25 이인수 규소계 운반체를 이용한 각종 인쇄물의 장기 보관을 위한처리제
DE10057554B4 (de) * 2000-11-21 2007-05-24 Zfb Project-Management Gmbh Festigungs- und/oder Stabilisierungsmittel, Verfahren zur Festigung/Stabilisierung und Verwendung
FR2825726B1 (fr) * 2001-06-12 2003-10-31 Herve Cheradame Procede de desacidification du papier et ses applications
SK287845B6 (sk) * 2007-09-18 2012-01-04 Stu Fakulta Chemickej A Potravinarskej Technologie Multifunction device for modification of cellulose materials and method for modification of cellulose materials
CN105862513B (zh) * 2016-04-22 2018-06-19 国家图书馆 一种纸张脱酸液及其制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969549A (en) * 1974-12-24 1976-07-13 The United States Of America As Represented By The Librarian Of Congress Method of deacidifying paper
DE3904111A1 (de) * 1989-02-11 1990-08-16 Battelle Institut E V Verfahren und vorrichtung zur umweltfreundlichen massenentsaeuerung von buechern und anderen papiererzeugnissen

Also Published As

Publication number Publication date
ES2077885T3 (es) 1995-12-01
JPH0693245A (ja) 1994-04-05
DE4104515C1 (enrdf_load_html_response) 1992-08-06
ATE125896T1 (de) 1995-08-15
CA2060926C (en) 2003-09-30
DE59203063D1 (de) 1995-09-07
EP0499076A1 (de) 1992-08-19
CA2060926A1 (en) 1992-08-15

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