Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
  • B29C44/34—Auxiliary operations
  • B29C44/56—After-treatment of articles, e.g. for altering the shape
  • B29C44/5627—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching
  • B29C44/5654—Subdividing foamed articles to obtain particular surface properties, e.g. on multiple modules
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
  • B29C44/34—Auxiliary operations
  • B29C44/3461—Making or treating expandable particles
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

• the invention relates to improved process for cutting open-celled foams based on aminoplasts and for the production of flakes or fine particles, and their use.
• Open-cell foams based on a melamine / formaldehyde condensation product are known for various heat and sound insulation applications in buildings and vehicles, as well as insulating and shock-absorbing packaging material.
• DE-A 31 02 567 describes a grinding or polishing paste for polishing metal surfaces, in which uniformly distributed powder parts are introduced into the melt of the paste whose hardness lies between the hardness of the grinding bodies and the hardness of the melt.
• powder parts metal parts such as copper powder, aluminum powder, zinc powder, brass powder or the like may be mentioned.
• the object of the invention was to remedy the disadvantages mentioned and to find a simple and dust-free process for cutting open-cell foams based on aminoplasts, as well as a process for producing flakes or finely divided particles.
• open-cell foams are preferably elastic foams based on a melamine / formaldehyde condensation product having a specific gravity of 5 to 100 g / l, in particular from 8 to 20 g / l used.
• the cell count is usually in the range of 50 to 300 cells / 25 mm.
• the tensile strength is preferably in the range of 100 to 150 kPa and the elongation at break in the range of 8 to 20%.
• a highly concentrated propellant-containing solution or dispersion of a melamine-formaldehyde precondensate can be foamed and cured with hot air, water vapor or by microwave irradiation.
• foams are commercially available under the name Basotect® from BASF Aktiengesellschaft.
• the molar ratio of melamine / formaldehyde is generally in the range of 1: 1 to 1: 5.
• the molar ratio in the range of 1: 1, 3 to 1: 1, 8 is selected and a sulfite group-free precondensate used, such as. B described in WO 01/94436.
• the open-cell foam is soaked in a liquid, for example alcohols, ketones, liquid hydrocarbons or water, prior to cutting or dividing.
• a liquid for example alcohols, ketones, liquid hydrocarbons or water, prior to cutting or dividing.
• water is used.
• the cutting can be done by means of conventional crushing machines, which have rotating blades or crushing parts.
• Suitable crushers are, for example, mills, such as ball mills or Ultraturax, extruders.
• a water or alcohol-impregnated piece of foam can be processed in this way particularly simple and dust-free to an aminoplast particle suspension. If desired, the suspension may then be filtered or centrifuged and the resulting powder subsequently dried. The dried powder or flakes can be added as an additive in the extruder to polymer melts, for example, or else used as soil improvers and moisture regulators in garden centers or in agriculture.
• the flakes or finely divided powder obtainable by the process according to the invention are particularly suitable as cleaning or polishing materials for surfaces.
• the finely divided powders can be dried or preferably applied directly as an aqueous suspension to sponges or nonwovens and fabrics directly or coated together with film-forming polymers. Particular preference is given to foams, nonwovens or fabrics of melamine resins. When using a fabric or fabric, the pressure is easily controllable and the cleaning action can be adjusted to the requirements.
• the flakes and particles according to the invention are suitable together with water as an excellent fire-extinguishing agent.
• the flakes of the invention can also be quickly and easily absorbed organic matter, such as oil in case of an accident from the surface of the water and disposed of by collecting or pumping out the impregnated flakes.
• Another object of the invention is a polishing paste containing the obtainable by the method described above finely divided particles of aminoplasts abrasive abrasive. Since the abrasive is organic-based, it has a lower hardness than the commonly used abrasive, such as diamond, corundum or silicates.
• polishing pastes alone or optionally together with other common highly abrasive abrasives, such as aluminum, magnesium, chromium, tin (IV), iron oxides, silicon carbide, diatomaceous earth, diamond dust, cerium and / or iodine. Zirconium oxides are used.
• Suitable carrier substances for the polishing paste are, for example, water, alcohols, polyethylene glycol or waxes.
• the carrier substance for the polishing paste is preferably already used as a liquid for impregnating the open-cell foam prior to comminution.
• Other conventional additives such as suspension stabilizers, anti-settling agents, bentonites or odorous substances may be added to the polishing agent or the polishing paste.
• the polishing or polishing paste is suitable for the gentle cleaning and polishing of plastics, glasses, car windows, painted surfaces, metals, magnetic media, electronic circuits, silicon wafers or teeth, dental prostheses, dental fillings or artificial teeth.
• the mechanical polishing can be achieved by lightly pressing the relevant workpiece, for. As of metal, glass, wood, plastic, or leather on horizontal, driven by a motor u. with a wool cloth or velvet covered discs, which are coated with the polishing agent or polishing paste according to the invention, carried out.
• a 2 cm ⁇ 4 cm ⁇ 10 cm piece of open-cell melamine / formaldehyde foam having a density of 15 g / m 3 (Basotect® from BASF Aktiengesellschaft) was soaked in water and comminuted for 5 minutes in a household mixer (Moulinex type). This resulted in a suspension having a solids content of about 2 wt .-%.
• Example 1 The suspension from Example 1 was successively mixed with further, dry Basotect® pieces and comminuted in a household mixer until the solids content was 15% by weight.
• the suspension was then placed on a household cloth and cleaned by mild pressure a dirty table surface.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
• Detergent Compositions (AREA)
• Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
• Crushing And Pulverization Processes (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (1)

Family

ID=38513752

Family Applications (1)

Country Status (7)

Families Citing this family (17)

Family Cites Families (6)

• 2007
  • 2007-07-03 EP EP07787010A patent/EP2043833A1/de not_active Withdrawn
  • 2007-07-03 KR KR1020097002769A patent/KR20090038897A/ko not_active Application Discontinuation
  • 2007-07-03 WO PCT/EP2007/056686 patent/WO2008006736A1/de active Application Filing
  • 2007-07-03 JP JP2009518843A patent/JP2009542878A/ja not_active Withdrawn
  • 2007-07-03 BR BRPI0714246-3A patent/BRPI0714246A2/pt not_active IP Right Cessation
  • 2007-07-03 CN CN200780024493.0A patent/CN101479088A/zh active Pending
  • 2007-07-30 US US12/373,168 patent/US20090291306A1/en not_active Abandoned

Non-Patent Citations (1)

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