Binder-consolidated textile fabric, method for producing it, and use thereof
The invention relates to a novel binder system and its use for bonding textile fabrics as well as products containing such bonded textile fabrics. The materials according to the invention are suitable for the manufacture of base interlinings, optionally in combination with at least one further textile fabric, for coated sarking membranes, roofing sheets and water-proof sheetings, as a textile backing or a textile reinforcement in floorings, in particular in carpets and PVC floorings, or in facer, wall coating inside and outside of buildings as well as in furniture.
1. A binder system, comprising:
polymerisates based on carboxylic acid, which have no low-molecular cross-linking agent, wherein an amount of polymerisates based on carboxylic acid is in a range from 30 to 70% by weight,
a starch or a mixture of a plurality of starches, wherein the starch or the mixture of a plurality of starches are not the same as the polymerisates based on carboxylic acid and an amount of the starch or the mixture of the plurality of starches is in a range from 30 to 95% by weight,
a catalyst, wherein an amount of the catalyst is up to 10% by weight,
an adhesion promoter, wherein an amount of the adhesion promoter is up to 1% by weight, and
additives, wherein an amount of the additives is up to 10% by weight,
wherein the specified percentages by weight refer to the dry mass of the binder system, i.e., without water and the percentages by weight sum to 100% by weight.
2. The binder system according to claim 1 , wherein the amount of polymerisates based on carboxylic acid is at least 15% by weight.
3. The binder system according to claim 1 , wherein the amount of the starch or the mixture of the plurality of starches is at least 50% by weight.
4. The binder system according to claim 1 , wherein the sum of the amount of polymerisates based on carboxylic acid and the amount of the starch or the mixture of the plurality of starches is at least 85% by weight.
5. The binder system according to claim 4 , wherein the ratio (parts per weight) of the polymerisates based on carboxylic acid and the starch or the mixture of the plurality of starches is between 20:80 to 30:70.
6. The binder system according to claim 1 , wherein the amount of the catalyst is at least 2% by weight.
7. The binder system according to claim 1 , characterized in that the binder system is an aqueous dispersion or solution and the viscosity is 900 to 4000 mPa*s (determined according to DIN EN ISO 2555 and at 23° C.).
8. The binder system according to claim 1 , characterized in that the polymerisates based on carboxylic acids still have unsaturated constituents and/or are available as a mixture with unsaturated monomeric carboxylic acid constituents.
9. The binder system according to claim 8 , characterized in that the unsaturated monomeric carboxylic acid constituents are compounds capable of forming acrylates or polyacrylates.
10. The binder system according to claim 1 , characterized in that the polymerisates based on carboxylic acids are polyacrylates based on acrylic acid, modified acrylic acid, maleic acid/maleic acid anhydride, styrene-maleic acid anhydride (SMA), or a combination thereof.
11. The binder system according to claim 1 , characterized in that the polymerisates based on carboxylic acid have free carboxylic acid groups, the acid groups are bound covalently to the polymer backbone and the concentration of free carboxylic acid groups is 500 to 1000 mg KOH/g of solid.
12. The binder system according to claim 1 , wherein the polymerisates based on carboxylic acid comprise an additional polyacrylate dispersion based on carboxylic acid, modified acrylic acid, maleic acid/maleic acid anhydride, styrene-maleic acid anhydride (SMA), or a combination thereof,
wherein the additional polyacrylate dispersion is different from the polymerisates based on carboxylic acid with respect to its chemical composition and/or with respect to its physical properties, and
the quantity of the additional polyacrylate dispersion is in a range of 1% to 10% by weight.
13. The binder system according to claim 1 , characterized in that the binder system contains 0.1 to 10% by weight of catalyst, wherein the catalyst is based on alkaline phosphinate/alkaline earth phosphinate, alkali metal hypophosphites, alkali metal phosphites, or a combination thereof.
14. The binder system according to claim 1 , characterized in that the binder system is an aqueous polymer dispersion or polymer solution and the solids content is between 40 to 60% by weight (determined according to DIN EN ISO 3251).
15. Use of the binder system according to claim 1 for the consolidation of textile fabrics, wherein an applied quantity is between 10 and 25% by weight of binder, after drying and with reference to the total weight of the textile fabric used.
16. A textile fabric which has been consolidated with the binder system according to claim 1 , wherein the applied quantity of the binder system is between 10 and 25% by weight of binder, after drying and with reference to the total weight of the textile fabric used.
17. The textile fabric according to claim 16 , characterized in that it is a textile fabric based on mineral fibers and/or glass fibers, the weight per unit area of which is between 25 and 90 g/m 2 .
18. The textile fabric according to claim 16 , characterized in that it is a textile fabric based on spunbonded non-woven fabrics, the weight per unit area of which is between 40 and 250 g/m 2 .
19. Use of the textile fabric according to claim 16 as a base interlining, optionally in combination with at least one further textile fabric, for coated sarking membranes, roofing sheets and water-proof sheetings, as a textile backing or a textile reinforcement in floorings or in facer, wall coating inside and outside of buildings as well as in furniture.
20. The binder system according to claim 1 , wherein the starch or mixture of a plurality of starches consists essentially of natural starch, wherein the nature starch consists essentially of amylose and amylopectin.