Coating compositions for glass fibres

• US 3,954,490 A
• Filed: 07/03/1974
• Issued: 05/04/1976
• Est. Priority Date: 07/03/1973
• Status: Expired due to Term

• Current Assignee: Pilkington Brothers Unlimited (Pilkington PLC)
• Original Assignee: Pilkington Brothers Unlimited (Pilkington PLC)
• Inventors: Cockram, David Ralph
• Primary Examiner(s): Poer, J.
• Application Number:
  US05/485,659
• Time in Patent Office: 671 Days
• Field of Search: 106/90, 106/99, 428/392
• US Class Current: 106/711
• CPC Class Codes: C03C 13/002 containing zirconium
• CPC Class Codes: C03C 25/103 Organic coatings
• CPC Class Codes: C04B 14/42 Glass
• CPC Class Codes: C04B 20/1018 with organic materials pigments or dyes C04B20/1096
• CPC Class Codes: C04B 20/12 Multiple coating or impregnating
• CPC Class Codes: C04B 24/02 Alcohols; Phenols; Ethers
• CPC Class Codes: C04B 24/38 Polysaccharides or derivatives thereof C04B24/243 takes precedence

Abstract

A cementitious product and production method wherein the product comprises cement with reinforcing glass fibres therein which are coated with a composition which consists essentially of a protective material to reduce deterioration of the glass fibres, the material being a monocyclic or polycyclic aromatic compound which has at least three hydroxyl groups on the aromatic ring, or when a polycyclic compound is employed, on at least one of the aromatic rings. Preferably, the aromatic compound is soluble in a calcium hydroxide solution, and a preferred such compound is pyrogallol. The composition can also contain a film-forming agent such as a polyvinyl acetate of cationic character or a polyethylene glycol of non-ionic character, as well as a linking agent such as a silane.

Claims

1. A cementitious product comprising cement and, as reinforcement, glass fibres coated with a composition which consists essentially of a protective material to reduce deterioration of the glass fibres, said protective material being a monocyclic or polycyclic aromatic compound which has at least three hydroxyl groups on the aromatic ring or when a polycyclic compound is employed, on at least one of the aromatic rings.

2. A cementitious product according to claim 1, wherein the aromatic compound is soluble in a calcium hydroxide solution.

3. A cementitious product according to claim 1, wherein the aromatic compound is a monocyclic 6-membered-ring compound having at least three hydroxyl groups substituted in the ring.

4. A cementitious product according to claim 3, wherein the aromatic compound is pyrogallol.

5. A cementitious product according to claim 3, wherein the aromatic compound is hydroxy hydroquinone.

6. A cementitious product according to claim 3, wherein the aromatic compound is phloroglucinol.

7. A cementitious product according to claim 1, wherein the aromatic compound is a product obtained by oxidation in alkaline solution of a monocyclic 6-membered-ring compound having at least three hydroxyl groups substituted in the ring.

8. A cementitious product according to claim 7, wherein the aromatic compound is an ammonium oxidation salt of pyrogallol.

9. A cementitious product according to claim 1, wherein the aromatic compound is a monocyclic 6-membered-ring compound having at least three hydroxyl groups and at least one other group substituted in the ring, or a carboxylic acid salt or ester thereof.

10. A cementitious product according to claim 9, wherein the aromatic compound is 2,3,4 tri-hydroxybenzoic acid.

11. A cementitious product according to claim 9, wherein the aromatic compound is 3,4,5 tri-hydroxybenzoic acid (gallic acid).

12. A according to claim 9, wherein the aromatic compound is propyl gallate.

13. A cementitious product according to claim 9, wherein the aromatic compound is 2,4,6 tri-hydroxybenzoic acid.

14. A cementitious product according to claim 9, wherein the aromatic compound is 2,4,6 tri-hydroxybenzaldehyde.

15. A cementitious product according to claim 9, wherein the aromatic compound is 2,3,4 tri-hydroxyacetophenone.

16. A cementitious product according to claim 9, wherein the aromatic compound is 2,4,6 tri-hydroxyacetophenone.

17. A cementitious product according to claim 9, wherein the aromatic compound is tetrahydroxy-p-quinone dihydrate.

18. A cementitions product according to claim 1, wherein the aromatic compound is a product obtained by oxidation in alkaline solution of a monocyclic 6-membered-ring compound having at least three hydroxyl groups and at least one other group substituted in the ring.

19. A cementitious product according to claim 18, wherein the aromatic compound is an ammonium oxidation salt of gallic acid.

20. A cementitious product according to claim 1, wherein the aromatic compound is a hetero-monocyclic 6-membered-ring aromatic compound having two nitrogen atoms within the ring and at least three hydroxyl groups as substituents in the ring.

21. A cementitious product according to claim 20, wherein the aromatic compound is 2,4,6 tri-hydroxypyrimidine (barbituric acid).

22. A cementitious product according to claim 1, wherein the aromatic compound is a polycyclic aromatic hydrocarbon having at least three hydroxyl groups substituted in a single 6-membered ring.

23. A cementitious product according to claim 22, wherein the aromatic compound is purpurogallin.

24. A cementitious product according to claim 22, wherein the aromatic compound is 1,2,4 tri-hydroxyanthraquinone (purpurin).

25. A cementitious product according to claim 22, wherein the aromatic compound is 2,4,6 tri-hydroxy benzophenone.

26. A cementitious product according to claim 22, wherein the aromatic compound is tannic acid.

27. A cementitious product according to claim 22, wherein the aromatic compound is a naturally occurring vegetable tannin.

28. A cementitious product according to claim 1, wherein said composition further contains a film-forming agent and a linking agent.

29. A cementitious product according to claim 28, wherein the film-forming agent comprises a polyvinyl acetate of cationic character.

30. A cementitious product according to claim 28, wherein the film-forming agent comprises a polyethylene glycol of non-ionic character.

31. A cementitious product according to claim 28, wherein the linking agent is a silane.

32. A cementitious product according to claim 1, said fibres being formed from an alkali-resistant glass containing at least 5 mol % ZrO₂.

33. A cementitious product according to claim 32, said glass fibres having a further protective coating applied after the glass fibres have been coated with said composition.

34. A cementitious product according to claim 33, wherein said further protective coating is an epoxy resin polymer.

35. A method of forming a glass fibre reinforced cementitious product, said method comprising the steps of coating glass fibres with a composition which consists essentially of a protective material to reduce deterioration of the glass fibres, said protective material being a monocyclic or polycyclic aromatic compound which has at least three hydroxyl groups on the aromatic ring or when a polycyclic compound is employed, on at least one of the aromatic rings, and subsequently incorporating said coated glass fibres into a cementitious matrix comprising cement.

36. A method according to claim 35, comprising applying the coating composition as a size to the individual glass fibres immediately after they have been drawn from the molten glass composition.

37. A method according to claim 35, comprising applying the coating composition to the glass fibres after sizing and combination of the individual fibres into a strand.

38. A method according to claim 35, wherein said glass fibres are of an alkali-resistant glass composition containing at least 5 mol % ZrO₂.