GB648639A - Improvements in the production of moulded rubber articles - Google Patents
Improvements in the production of moulded rubber articlesInfo
- Publication number
- GB648639A GB648639A GB1709948A GB1709948A GB648639A GB 648639 A GB648639 A GB 648639A GB 1709948 A GB1709948 A GB 1709948A GB 1709948 A GB1709948 A GB 1709948A GB 648639 A GB648639 A GB 648639A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- esterified
- hydroxy
- acetylated
- chain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Lubricants (AREA)
Abstract
Esters of hydroxy-carboxylic acids containing an uninterrupted chain of at least 18 carbon atoms, in which an hydroxyl group is esterified with a monocarboxylic acid and a carboxylic group is esterified with a saturated aliphatic alcohol, in particular esters conforming to the formula R[OOC.CnHm(OOC.R1)p]q where n is at least 17, p is 1 or 2 and m+p=(2n - 1) or (2n+1), R is a saturated straight-chain aliphatic hydrocarbon radical of valence q, and R1 is an alkyl radical, are used as mould lubricants for rubber goods (see Group V). Preferably R contains 2 or 3 and R1 1 to 3 carbon atoms. Examples are glycerides of acetylated aliphatic hydroxy-carboxylic acids containing a double bond but the ester may be an ester of ethylene glycol and the hydroxy group of the hydroxy-carboxylic acid may be esterified with the propionic or benzoic acid radical. The esters may be obtained from the corresponding long-chain unsaturated acids by first esterifying an alcohol of formula R(OH)q with an hydroxycarboxylic acid and then esterifying the hydroxy group of the long-chain acid, e.g. with the acid chloride of the appropriate carboxylic acid. Alternatively an ester of a long-chain unsaturated acid may be heated with a peracid to give the corresponding epoxide and organic acid. The organic acid thus liberated reacts on continued heating with the epoxide giving the half-ester which can then be further esterified. The reaction may be interrupted after the first stage, however, and the epoxide hydrolysed to the corresponding dihydroxy compound and the hydroxy groups esterified. Olein (glyceride of oleic acid) may thus be converted to the acetylated glyceride of dihydroxystearic acid (the essential constituent of grape seed oil). Acetylated castor oil (acetylated glyceride of ricinoleic acid) is also specifically referred to.ALSO:Moulds for moulding articles from rubber compositions are lubricated with an ester of an hydroxy-carboxylic acid containing an uninterrupted chain of at least 18 carbon atoms, in which an hydroxyl group is esterified with a monocarboxylic acid and a carboxylic acid group is esterified with a saturated aliphatic alcohol. The preferred lubricants, e.g. acetylated grape-seed or castor oil, fall within the general formula R[OOC.CnHm(OOC.R1p)]q, where n is at least 17, m+p=2n or 2n/sB1, R is a saturated straight-chain aliphatic hydrocarbon radicle of valence q and R1 is an alkyl radical, R preferably containing 2 to 3 carbon atoms and R1 1 to 3 carbon atoms. The glycerides of acetylated aliphatic hydroxycarboxylic acids containing a double bond are stated to be suitable but the alcohol may be ethylene glycol and R1 may be the propionic or benzoic acid radicals. The lubricant may be applied to a warm mould by spraying as a 1 per cent solution in naphtha or ethyl alcohol, the solvent is allowed to evaporate and the rubber composition moulded in the usual manner. Where corrosion of the mould is not likely to be great a 2-3 per cent dispersion in water may be used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1709948A GB648639A (en) | 1948-06-25 | 1948-06-25 | Improvements in the production of moulded rubber articles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1709948A GB648639A (en) | 1948-06-25 | 1948-06-25 | Improvements in the production of moulded rubber articles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB648639A true GB648639A (en) | 1951-01-10 |
Family
ID=10089229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1709948A Expired GB648639A (en) | 1948-06-25 | 1948-06-25 | Improvements in the production of moulded rubber articles |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB648639A (en) |
-
1948
- 1948-06-25 GB GB1709948A patent/GB648639A/en not_active Expired
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