Formaldehyde-free sizing composition for fibres, in particular mineral fibres, and resulting products
A formaldehyde-free sizing composition for products based on fibers, in particular mineral fibers, such as glass or rock fibers, which includes at least one reducing sugar, at least one inorganic acid metal salt, at least one amine, and at least one compound including activated ethylenic unsaturation(s), the inorganic acid metal salt being present in an amount at least equal to 1% of the weight of the reducing sugar.
1. Formaldehyde-free sizing composition for fibres, comprising:
at least one reducing sugar,
copper sulphate,
at least one amine selected from the group consisting of monoethanolamine, diethanolamine, diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), pentaethylenehexamine (PEHA), aminoethyltriethylenetetramine (AETETA), N″-(aminoethyl)tetraethylenepentamine and N′-(aminoethyl)tetraethylenepentamine (AETEPA), bis(piperazine)ethylene (BISPIP), aminoethylpiperazinylethylethylenediamine (AEPEEDA), piperazinylethyldiethylenetriamine (PEDETA), aminoethylpiperazinylethyldiethylenetriamine (AEPEDETA), piperazinylethyltriethylenetetramine (PETETA), tris(aminoethyl)aminoethylpiperazine (TRISAEAEP) and piperazinylethylaminoethyldiethylenetriamine (PEAEDETA), and mixtures thereof, and
at least one compound comprising activated ethylenic unsaturation(s),
the copper sulphate being present in an amount at least equal to 1% of the weight of the reducing sugar.
2. Composition according to claim 1 , wherein the reducing sugar is an oligosaccharide including from 1 to 10 saccharide units.
3. Composition according to claim 2 , wherein the reducing sugar is glucose, galactose, mannose, fructose, lactose, maltose, isomaltose or cellobiose.
4. Composition according to claim 3 , wherein the reducing sugar is glucose or fructose.
5. Composition according to claim 1 , wherein the amount of copper sulphate represents from 1 to 30% of the weight of the reducing sugar.
6. Composition according to claim 1 , wherein the amine is diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA) and mixtures of abovementioned amines in which TEPA is predominant.
7. Composition according to claim 1 , wherein the compound comprising activated ethylenic unsaturation(s) corresponds to the following formula (IV):
in which:
R 3 represents a hydrogen atom, a C 1 -C 5 alkyl group, a hydroxyl group or a C 1 -C 5 alkoxy group,
R 4 and R 5 , which are identical or different, represent a hydrogen atom, a C 1 -C 5 alkyl group or a —CO—R 3 group,
R 6 represents a hydrogen atom or a hydrocarbon chain which can include one or more heteroatoms.
8. Composition according to claim 7 , wherein the compound is acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid, citraconic acid, itaconic acid and the anhydrides of these acids.
9. Composition according to claim 1 , wherein the amount of amine in the composition is such that a molar ratio of the compound comprising activated ethylenic unsaturation(s) to the amine varies from 1 to 3.5.
10. Composition according to claim 1 , wherein the amount of compound comprising activated ethylenic unsaturation(s) in the composition is such that a molar ratio of the compound to the sum of the constituent saccharide units of the reducing sugar varies from 0.05 to 1.5.
11. Composition according to claim 1 , further comprising the additives below in the following proportions, calculated on the basis of 100 parts by weight of reducing sugar, copper sulphate, amine and compound comprising activated ethylenic unsaturation(s):
from 0 to 2 parts of silane,
from 0 to 20 parts of oil,
from 0 to 5 parts of a silicone,
from 0 to 30 parts of an extender.