Sizing composition for glass yarns, the glass yarns thus obtained and composite materials comprising said yarns
View Patent ↗The invention relates to a sizing composition composed of a solution comprising at least 5% by weight of solvent and comprising a thermally curable base system, said system comprising at least 60% by weight of components with a molecular mass of less than 750 and at least 60% by weight of components of a mixture exhibiting at least one epoxy reactive functional group, at least one amine, preferably primary or secondary amine, reactive functional group, and at least one hydroxyl reactive functional group. Another subject matter of the invention relates to the glass strands coated with the abovementioned sizing composition. The glass strands obtained are capable of being used to reinforce organic or inorganic materials.
1. A glass strand coated with a sizing composition which comprises a solution comprising less than 5% by weight of solvent and comprising a thermally curable base system, said system comprising at least 60% by weight of components with a molecular mass of less than 750 and at least 60% by weight of components of a mixture:
of (1) at least one component comprising at least one epoxy reactive functional group,
of (2) at least one component comprising at least one amine reactive functional group,
and of (3) at least one component comprising at least one hydroxyl reactive functional group,
wherein said base system, upon curing, forms an epoxy-amine-hydroxyl terpolymer.
2. The glass strand as claimed in claim 1 , wherein the content of said thermally curable base system is between 75 and 100% by weight of the composition.
3. The glass strand as claimed in claim 1 , wherein said thermally curable base system is composed of 80% to 100% by weight of said mixture.
4. The glass strand as claimed in claim 1 , wherein said thermally curable base system comprises at least 70% by weight said components with a molecular mass of less than 750.
5. The glass strand as claimed in claim 1 , wherein the ratio r of the number of epoxy reactive sites to the sum of the number of amine reactive sites and of the number of hydroxyl sites is between 0.2 and 2.5.
6. The glass strand as claimed in claim 1 , wherein the ratio r′ of the number of amine reactive sites to the number of hydroxyl reactive sites is between 0.5 and 20.
7. The glass strand as claimed in claim 1 , wherein the content of said (1) is between 15 and 85% by weight of the sizing composition.
8. The glass strand as claimed in claim 1 , wherein the content of said (2) is greater than or equal to 5% by weight of the sizing composition.
9. The glass strand as claimed in claim 1 , wherein the content of said (3) is greater than or equal to 5% by weight of the sizing composition.
10. The glass strand as claimed in claim 1 , wherein said sizing composition additionally comprises a catalyst in a proportion of less than 8% by weight.
11. The glass strand as claimed in claim 1 , wherein said sizing composition additionally comprises a coupling agent in proportions of between 0 and 30% by weight.
12. The glass strand as claimed in claim 1 , wherein said sizing composition additionally comprises a textile processing agent in proportions of between 0 and 30% by weight.
13. The glass strand as claimed in claim 1 , wherein said sizing composition additionally comprises a film-forming agent in a proportion of less than or equal to 8% by weight.
14. The glass strand as claimed in claim 1 , wherein said sizing composition comprises at least one corrosion inhibitor.
15. The glass strand as claimed in claim 1 , wherein said thermally curable base system, wherein (2) includes two amine reactive functional groups.
16. The glass strand as claimed in claim 1 , wherein said amine reactive functional groups are primary and/or secondary amine reactive functional groups.
17. A sizing composition, which comprises a solution comprising less than 5% by weight of solvent and comprising a thermally curable base system, said system comprising at least 60% by weight of components with a molecular mass of less than 750 and at least 60% by weight of components of a mixture:
of (1) at least one component comprising at least one epoxy reactive functional group,
of (2) at least one component comprising at least one amine reactive functional group,
and of (3) at least one component comprising at least one hydroxyl reactive functional group,
wherein said base system, upon curing, forms an epoxy-amine-hydroxyl terpolymer.
18. A composite comprising at least one organic and/or inorganic material and sized glass strands, wherein all or a portion of the glass strands comprise the sized glass strands as claimed in claim 1 .
19. The glass strand as claimed in claim 14 , wherein the corrosion inhibitor comprises gallic acid or a derivative thereof.
20. The sizing composition as claimed in claim 17 , wherein said amine reactive functional groups are primary and/or secondary amine reactive functional groups.