SIZING COMPOSITION BASED ON A NON-REDUCING SACCHARIDE AND A HYDROGENATED SACCHARIDE, AND INSULATING PRODUCTS OBTAINED

Abstract

A sizing composition, in particular for insulating products based on mineral wool, in particular of glass or of rock, includes at least one non-reducing saccharide, at least one hydrogenated saccharide, and at least one polycarboxylic organic acid.

Claims

1. A sizing composition for insulating products comprising: at least one non-reducing saccharide, at least one hydrogenated saccharide, and at least one polycarboxylic organic acid.

2. The composition as claimed in claim 1, wherein the non-reducing saccharide is a non-reducing oligosaccharide containing at most 10 saccharide units.

3. The composition as claimed in claim 2, wherein the non-reducing saccharide is trehalose, an isotrehalose, sucrose, an isosucrose, melezitose, gentianose, raffinose, erlose, umbelliferose, stachyose or verbascose.

4. The composition as claimed in claim 1, wherein the hydrogenated saccharide is chosen from erythritol, arabitol, xylitol, sorbitol, mannitol, iditol, maltitol, isomaltitol, lactitol, cellobitol, palatinitol, maltotritol and the hydrogenation products of starch hydrolysates.

5. The composition as claimed in claim 4, wherein the hydrogenated saccharide is the hydrogenation product of a starch hydrolysate.

6. The composition as claimed in claim 4, wherein the hydrogenated saccharide has a number-average molar mass of less than 100 000.

7. The composition as claimed in claim 1 wherein the hydrogenated saccharide(s) represent(s) from 18% to 80% of the total weight of non-reducing saccharide(s) and hydrogenated saccharide(s).

8. The composition as claimed in claim 1, wherein the polycarboxylic organic acid comprises at least two carboxylic functions.

9. The composition as claimed in claim 8, wherein the polycarboxylic organic acid has a number-average molar mass of less than or equal to 1000.

10. The composition as claimed in claim 9, wherein the polycarboxylic organic acid is a saturated or unsaturated and straight or branched acyclic acid, a cyclic acid or an aromatic acid.

11. The composition as claimed in claim 10, wherein the polycarboxylic organic acid is chosen from oxalic acid, malonic acid, succinic acid, glutamic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid, tartaric acid, tartronic acid, aspartic acid, glutamic acid, fumaric acid, itaconic acid, maleic acid, traumatic acid, camphoric acid, phthalic acid and its derivatives, tetrahydrophthalic acid and its derivatives, isophthalic acid, terephthalic acid, mesoconic acid, citraconic acid, citric acid, tricarballylic acid, 1,2,4-butanetricarboxylic acid, aconitic acid, hemimellitic acid, trimellitic acid, trimesic acid, 1,2,3,4-butanetetracarboxylic acid and pyromellitic acid.

12. The composition as claimed in claim 11, wherein the polycarboxylic organic acid is citric acid.

13. The composition as claimed in claim 1, wherein the non-reducing saccharide(s) and the hydrogenated saccharide(s) represent from 10% to 90% of the weight of the mixture consisting of the non-reducing saccharide(s), the hydrogenated saccharide(s) and the polycarboxylic organic acid(s).

14. The composition as claimed in claim 1, further comprising a catalyst chosen from Lewis bases and acids, phosphorus-containing compounds and compounds containing fluorine and boron.

15. The composition as claimed in claim 14, wherein the catalyst represents up to 20% of the total weight of the non-reducing saccharide(s), of the hydrogenated saccharide(s) and of polycarboxylic organic acid(s).

16. The composition as claimed in claim 1, further comprising the additives below in the following proportions calculated on the basis of 100 parts by weight of non-reducing saccharide(s), of hydrogenated saccharide(s) and of polycarboxylic organic acid(s): 0 to 2 parts of silane, 0 to 40 parts of oil, 0 to 30 parts of urea, 0 to 5 parts of a silicone, 0 to 20 parts of a polyol other than the abovementioned saccharides, 0 to 15 parts of metal sulfate or ammonium sulfate, and 0 to 30 parts of an extender chosen from lignin derivatives and animal or plant proteins.

17. An acoustic and/or thermal insulating product based on mineral wool sized using the sizing composition as claimed in claim 1.

18. A net of mineral fibers sized using the sizing composition as claimed in claim 1.

19. The composition as claimed in claim 1, wherein the insulating products are based on mineral wool including rock or glass.

20. The composition as claimed in claim 3, wherein the non-reducing saccharide is sucrose or trehalose.

21. The composition as claimed in claim 20, wherein the non-reducing saccharide is sucrose.

22. The composition as claimed in claim 5, wherein the hydrogenated saccharide is a maltitol syrup.

23. The composition as claimed in claim 6, wherein the hydrogenated saccharide has a number-average molar mass of less than 50 000.

24. The composition as claimed in claim 23, wherein the hydrogenated saccharide has a number-average molar mass of less than 5000.

25. The composition as claimed in claim 24, wherein the hydrogenated saccharide has a number-average molar mass of less than 1000.

26. The composition as claimed in claim 6, wherein the hydrogenated saccharide has a number-average molar mass greater than 100.

27. The composition as claimed in claim 7, wherein the hydrogenated saccharide(s) represent(s) from 30% to 70% of the total weight of non-reducing saccharide(s) and hydrogenated saccharide(s).

28. The composition as claimed in claim 27, wherein the hydrogenated saccharide(s) represent(s) from 40% to 60% of the total weight of non-reducing saccharide(s) and hydrogenated saccharide(s).

29. The composition as claimed in claim 8, wherein the polycarboxylic organic acid comprises at most 15 carboxylic functions.

30. The composition as claimed in claim 29, wherein the polycarboxylic organic acid comprises two to four carboxylic functions.

31. The composition as claimed in claim 9, wherein the polycarboxylic organic acid has a number-average molar mass of less than or equal to 750.

32. The composition as claimed in claim 31, wherein the polycarboxylic organic acid has a number-average molar mass of less than or equal to 500.

33. The composition as claimed in claim 13, wherein the non-reducing saccharide(s) and the hydrogenated saccharide(s) represent from 20% to 85% of the weight of the mixture consisting of the non-reducing saccharide(s), the hydrogenated saccharide(s) and the polycarboxylic organic acid(s).

34. The composition as claimed in claim 33, wherein the non-reducing saccharide(s) and the hydrogenated saccharide(s) represent from 30% to 80% of the weight of the mixture consisting of the non-reducing saccharide(s), the hydrogenated saccharide(s) and the polycarboxylic organic acid(s).

35. The composition as claimed in claim 34, wherein the non-reducing saccharide(s) and the hydrogenated saccharide(s) represent from 40% to 65% of the weight of the mixture consisting of the non-reducing saccharide(s), the hydrogenated saccharide(s) and the polycarboxylic organic acid(s).

36. The composition as claimed in claim 35, wherein the non-reducing saccharide(s) and the hydrogenated saccharide(s) represent from 45% to 65% of the weight of the mixture consisting of the non-reducing saccharide(s), the hydrogenated saccharide(s) and the polycarboxylic organic acid(s).

37. The composition as claimed in claim 15, wherein the catalyst represents up to 10% of the total weight of the non-reducing saccharide(s), of the hydrogenated saccharide(s) and of polycarboxylic organic acid(s).

38. The composition as claimed in claim 15, wherein the catalyst represents at least 1% of the total weight of the non-reducing saccharide(s), of the hydrogenated saccharide(s) and of polycarboxylic organic acid(s).

39. The composition as claimed in claim 16, wherein the silane is an aminosilane or an epoxy silane.

40. The composition as claimed in claim 16, comprising 0 to 30 parts of oil.

41. The composition as claimed in claim 40, comprising 4 to 24 parts of oil.

42. The composition as claimed in claim 16, comprising 0 to 20 parts of urea.

43. The composition as claimed in claim 42, wherein the composition is devoid of urea.

44. The composition as claimed in claim 16, comprising 0 to 10 parts of metal sulfate or ammonium sulfate.

45. The composition as claimed in claim 44, comprising 0 to 5 parts of metal sulfate or ammonium sulfate.

46. The composition as claimed in claim 16, wherein the lignin derivatives are ammonium lignosulfonate or sodium lignosulfonate.

Description

EXAMPLES 1 AND 2

[0082] Sizing compositions comprising the constituents appearing in table 1, in proportions expressed as parts by weight, are prepared.

[0083] The sizing compositions are prepared by simply mixing the constituents in water, with vigorous stirring until complete dissolution or dispersion of the constituents.

[0084] By way of reference, a first sizing composition is prepared in accordance with application WO 2013/021112 (Reference 1) and a second sizing composition which contains 67 parts by weight of a resin prepared in accordance with application WO 2008/043960, 20 parts by weight of urea and the additives mentioned in table 1 is prepared (Reference 2).

[0085] The sizing compositions are used to manufacture insulating products based on glass wool on an industrial line.

[0086] The mineral wool is produced continuously on a line with a width of 2.4 m by the internal centrifugation technique in which the molten glass composition is converted into fibers by means of a tool, referred to as centrifuging disk, comprising a basket forming a chamber for receiving the molten composition and a peripheral band pierced by a multitude of orifices: the disk is rotated about its vertically positioned axis of symmetry, the composition is ejected through the orifices under the effect of the centrifugal force and the material escaping from the orifices is drawn into fibers with the assistance of a drawing gas stream.

[0087] Conventionally, a size spraying ring is placed beneath the fiberizing disk so as to uniformly distribute the sizing composition over the glass wool which has just been formed.

[0088] The mineral wool thus sized is collected on a belt conveyor equipped with internal suction boxes which hold the mineral wool in the form of a felt or a web at the surface of the conveyor. The conveyor then runs continuously into an oven at 270 C., where the constituents of the size polymerize to form a binder.

[0089] The insulating product obtained at the outlet of the oven has a nominal density equal to 17.5 kg/m.sup.3 and a nominal thickness equal to 75 mm.

[0090] The properties of the insulating products appearing in table 1 are evaluated in comparison with products using the reference sizing compositions (References 1 and 2).

[0091] The presence of non-reducing sugar in examples 1 and 2 according to the invention makes it possible to limit the reinflation compared with Reference 1.

[0092] The addition of ammonium sulfate (Example 2) improves the tensile strength after aging compared with References 1 and 2.

TABLE-US-00001 TABLE 1 Reference Reference Ex. 1 Ex. 2 1 2 Composition Reducing saccharide.sup.(1) 31.0 Sucrose.sup.(2) 24.0 24.0 Hydrogenated saccharide.sup.(3) 24.0 24.0 24.0 Citric acid 52.0 52.0 45.0 Sodium hypophosphite 5.0 5.0 5.0 Mineral oil.sup.(4) 8.0 8.0 8.0 9.5 -Aminopropyltriethoxysilane 0.5 0.5 0.5 0.5 Silicone.sup.(5) 2.1 2.1 2.1 2.1 Ammonium sulfate 5.0 3.0 pH 1.8.sup.(6) 1.9.sup.(6) 1.6.sup.(6) 5.6.sup.(7) Properties Tensile strength (N/g) Before aging 3.62 3.23 3.85 3.58 After aging 2.80 3.29 3.12 3.11 Loss (%) 22.6 0 19.0 13.1 Thickness (mm) Before treatment 81 83 83 83 After treatment 109 117 122 89 Reinflation (%) 35.7 42.1 47.3 6.7 Loss on ignition (%) 5.2 5.2 5.2 4.7 .sup.(1)dextrin from corn starch; weight-average molar mass: 3510; polydispersity index PI: 5.2; dextrose equivalent DE: 30; sold under the reference Roclys C3072S by ROQUETTE FRERES .sup.(2)granulated sugar No. 2 600 sold by TEREOS SYRAL .sup.(3)maltitol syrup at 75% solids containing 55% of maltitol; sold under the reference Maltilite 5575 by SYRAL .sup.(4)sold under the reference HydroWax 88 by SASOL .sup.(5)sold under the reference DC1581 by DOW CORNING .sup.(6)solids content of the sizing composition: 25% .sup.(7)solids content of the sizing composition: 20%