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AU-2005227381-A1 - Preparations for use in concrete

AU2005227381A1AU 2005227381 A1AU2005227381 A1AU 2005227381A1AU-2005227381-A1

Abstract

Use of a preparation (I), comprising aqueous dispersion of polychloroprene (20-99 wt.%), aqueous suspension of inorganic solid (preferably oxide, carboxide or silicate) (1-80 wt.%), optionally additionally other polymer-dispersion (preferably polyacrylate, polyacetate, polyurethane, polyurea, rubber or epoxide) and optionally additionally containing polymer dispersion conventional additives, for soaking fiber products. Independent claims are also included for: (1) soaked fiber products comprising (I); and (2) concrete and cement based product containing the fiber products.

Assignees

  • BAYER MATERIALSCIENCE AG

Dates

Publication Date
20060511
Application Date
20051027
Priority Date
20041027

Claims (18)

  1. 2. The process according to Claim 1, wherein more than 20 wt.% of the solid in suspension comprises silicon dioxide.
  2. 3. The process according to Claim 2, wherein the silicon dioxide contains silanol groups.
  3. 4. The process according to Claim 2, wherein the primary particle size of the silicon dioxide is from about 1 to about 400 nm, The process according to Claim 2, wherein the primary particle size of the silicon dioxide is from about 5 to about 100 nm.
  4. 6. The process according to Claim 2, wherein the primary particle size of the silicon dioxide is from about 8 to about 50 nm. -21-
  5. 7. The process according to Claim 1, wherein the polychloroprene contains O chemically bonded hydroxide groups in about 0.1 to about 1.5 of the O polymerized monomer groups. C
  6. 8. The process according to Claim 1, wherein the preparation contains up to 00 about 10 wt.% of zinc oxide. C-I cI
  7. 9. The process according to Claim 1, wherein the fibrous product is chosen from fibers, rovings, yams, textiles, knitted fabrics, bonded fabrics and non-woven fabrics. The process according to Claim 1, wherein the preparation comprises about 70 wt.% to about 98 wt.% of polychloroprene dispersion and about 2 wt.% to about 30 wt.% of a dispersion of inorganic solids
  8. 11. A fibrous product soaked with a preparation comprising: about 20 to about 99 wt.% of an aqueous dispersion based on polychloroprene; and about 1 to about 80 wt.% of an aqueous suspension based on inorganic solids chosen from oxides, carboxides and silicates, optionally, polymer dispersions chosen from polyacrylates, polyacetates, polyurethanes, polyureas, rubbers and epoxides, and optionally, additives and auxiliaries chosen from resins, stabilizers, antioxidants, cross-linking agents, cross-linking accelerators, fillers, thickening agents and fungicides, wherein the weight percentages of and total 100 wt.% and are based on the weight of non-volatile fractions. -22-
  9. 12. The fibrous product according to Claim 11, wherein more than 20 wt.% of the solid in suspension comprises silicon dioxide.
  10. 13. The fibrous product according to Claim 12, wherein the silicon dioxide 5 contains silanol groups. 00
  11. 14. The fibrous product according to Claim 12, wherein the primary particle size of the silicon dioxide is from about 1 to about 400 nm. ¢In
  12. 15. The fibrous product according to Claim 12, wherein the primary particle size of the silicon dioxide is from about 5 to about 100 nm.
  13. 16. The fibrous product according to Claim 12, wherein the primary particle size of the silicon dioxide is from about 8 to about 50 nm.
  14. 17. The fibrous product according to Claim 11, wherein the polychloroprene contains chemically bonded hydroxide groups in about 0.1 to about 1.5 of the polymerized monomer groups.
  15. 18. The fibrous product according to Claim 11, wherein that the preparation contains up to about 10 wt.% of zinc oxide.
  16. 19. The fibrous product according to Claim 11 in theform of one of fibers, rovings, yams, textiles, knitted fabrics, bonded fabrics and non-woven fabrics. The fibrous product according to Claim 11, wherein the preparation comprises about 70 wt.% to about 98 wt.% of polychloroprene dispersion and about 2 wt.% to about 30 wt.% of a dispersion of inorganic solids
  17. 23- c) 0 21. One of reinforced concrete and reinforced cement made by the process according to Cl Claim 1. 00 22. One of a concrete- and cement-based product reinforced with a fibrous product 5 made by the process according to Claim 11. 23. A process for reinforcing concrete or cement substantially as hereinbefore C described with reference to the examples and the accompanying drawings.
  18. 24. A fibrous product soaked with a preparation substantially as hereinbefore described with reference to the examples and the accompanying drawings. DATED THIS 27th day of October, 2005. BAYER MATERIALSCIENCE AG By Its Patent Attorneys DAVIES COLLISON CAVE

Description

AUSTRALIA PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S):: Bayer MaterialScience AG ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys Level 10, 10 Barrack Street, Sydney, New South Wales, Australia, 2000 INVENTION TITLE: Preparations for use in concrete The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5102 o PREPARATIONS FOR USE IN CONCRETE C.) O Field of the Invention The invention relates to a process for preparing fibrous products finished with aqueous dispersions of polychloroprene and a process for preparing textilereinforced and fiber-reinforced concrete and other cement-based products 00 10 including the finished fibrous products. Background of the Invention Concrete is one of the most important materials used in the construction industry and offers several advantages. It is inexpensive, durable and flexible with regard to design and mode of production. Accordingly, there are many different applications of concrete which lie in both the static/structural area and also in the non-load-bearing area. Concrete offers a particularly advantageous cost-benefit ratio for the transfer of compressive forces and is thus used to a large extent in the construction industry. Due to concrete's low tensile strength, reinforcement is required for the take-up of tensile forces and this reinforcement usually is in the form of steel. To ensure a good bond and as an anticorrosion measure, concrete steel reinforcement is S 25 typically provided with a concrete covering which is at least 2 3 cm thick. This leads to components with a thickness of at least 4 6 cm, depending on the environmental conditions and the method of preparation. If corrosion-insensitive, non-metallic, materials are used as reinforcement materials, then, as is wellknown, filigree and thin-walled cross-sections can be achieved due to the thin covering of concrete required. Short fibers, for example, may be added to reinforce thin-walled concrete work pieces. At present, short fibers typically are used, but the length and orientation of these fibers are not clearly defined in the composite material. Currently, the area of application for short fiber reinforced concretes is restricted to components Ssubjected to low mechanical stresses such as, for example, floor screeds and O objects such as plant tubs, etc. CI Long fibers exhibit greater effectiveness in thin-walled concrete work pieces and 00 these can be arranged in the direction of the tensile stresses occurring, for example in the form of rovings or textiles. CI To develop both more demanding and new types of fields of application for the fiber-concrete method of construction, industrial textiles with reinforcement filaments aligned in the direction of the highest tensile stresses have been developed. Industrial textiles (two-dimensional or multi-dimensional) such as nonwoven fabrics, netting, knitted fabrics or molded knitted fabrics are currently used only in individual cases during the industrial production of textile-reinforced concrete components. The reason for this is the current lack of production processes for processing such textiles to form components with complicated geometries. The methods used hitherto for producing textile-reinforced components permit the production of only linear, flat shapes because, in most cases, the dimensional stability of the textile is achieved by stretching. Particularly in the case of complicated geometries, stretching during industrial production is i impossible or possible to only a limited extent. At present, it is impossible to insert flexible reinforcement textiles in such components in a reproducible manner. Steel, plastics and glass fibers are currently used for the reinforcement of cementbonded building materials. The plastics fibers used are typically polypropylene fibers, but aramid fibers are also used. The table below gives the typical mechanical parameters for a variety of fibers. O to C.) -q- 00' 1^ (-N Material Density Tensile strength E-modulus [g/cm 3 [GPa] [GPa] Alkali-resistant AR glass 2.5 2.7 1.7 2.0 74 Carbon 1.6 2.0 1.5 3.5 180 500 Aramid 1.44- 1.45 2.8-2.9 59-127 Polypropylene 1.0 0.5 0.75 5 18 From among the large group of different glasses, virtually the only suitable are socalled AR glass fibers, because of their sufficiently high stability in the highly alkaline environment of cement-bonded building materials. In the lecture entitled "USE OF ADHESIVES FOR TEXTILE-REINFORCED CONCRETE" by S. Bohm, K. Dilger and F. Mund, 26th Annual Meeting of the Adhesive Society in Myrtle Beach, SC, USA, Feb. 26th, 2003, it was demonstrated that the calculated yam tensile strength/load-carrying capacity of reinforcement textiles is not achieved in concrete. The yam trials described in this publication show that yam tensile strength can be increased 30-40% by penetration with a polymer phase. This type of penetration was achieved by soaking bundles of