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
  • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
  • D21H13/36—Inorganic fibres or flakes
• • 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
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon
• • 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
  • D21J1/16—Special fibreboard
  • D21J1/20—Insulating board

Definitions

• the invention relates to a method for producing mineral and paper fiber-based insulation boards by slurrying mineral fibers, binders and conventional additives in water, shaping the insulation board by applying the slurry to a sieve, drying and solidifying the insulation board.
• Such panels are mainly used in suspended ceilings or wall panels for acoustic insulation of rooms. However, they are also used in structural fire protection, especially as door panels and cladding for beams and supports in steel structures as well as ventilation and electrical wiring ducts.
• the plates mentioned are manufactured in a so-called wet process.
• a strongly aqueous slurry of preferably mineral wool, paper fibers, starch, clay and kaolin is provided, which part of the water is removed on a sieve by suction.
• the sieve cake thus created is then passed into an oven in which the residual water evaporates at an elevated temperature.
• the starch gel hardens by drying and creates a firm connection between the intersecting mineral and paper fibers.
• non-ionic surfactants are added to the aqueous slurry (also to reduce the density by the foam produced).
• this addition of surfactant has the disadvantage that after drying a highly hydrophilic component remains in the plates.
• the individual disadvantages are as follows:
• the surfactants previously used tend to adsorb atmospheric moisture. This can lead to softening of the binder used. This reduces the binding force and, due to its own weight, the panels attached to the frame can bend.
• the object of the invention is to achieve that as much water as possible is removed from the mixture to be dried before the drying process and that no hydrophilic surfactant (eg alkylphenyl ethoxylates) remains in the plate.
• hydrophilic surfactant eg alkylphenyl ethoxylates
• silicone resins to the mineral and paper fiber slurry as water repellents.
• a surfactant of the prior art namely a nonylphenyl ethoxylate with 6 ethylene oxide groups.
• the surfactant concentrations used refer to the solids content in the standard mixture.
• the residues on the filter still contain the following water components: Standard mix 61% example 1 56% Example 2 46% Example 3 45%
• the plate-shaped filter residues according to Examples 1, 2 and 3 are each dried for 1 3 ⁇ 4 hours at 170 ° C, weighed after cooling and then immersed in a water bath 5 cm deep under water for a period of 2 hours. Then the samples listed above are taken, the standing water is blotted with filter paper and weighed out. The following water absorption values are obtained: example 1 18% Example 2 7% Example 3 8th %
• the filter residues in which the siloxane surfactants according to the invention are used contain significantly less water. This means that in addition to lower energy costs, higher production speeds in the production of mineral and paper fiber boards can be achieved.
• the finished plates also show significantly improved hydrophobic properties.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Paper (AREA)
• Silicon Polymers (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7788404

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (8)

Family Cites Families (11)

• 1996
  • 1996-03-15 DE DE19610234A patent/DE19610234C2/de not_active Expired - Fee Related
• 1997
  • 1997-03-01 EP EP97103400A patent/EP0795644A3/fr not_active Withdrawn
  • 1997-03-14 US US08/818,816 patent/US5776392A/en not_active Expired - Fee Related

Also Published As

Similar Documents

Legal Events