GB1427670A - Rotational moulding - Google Patents

Rotational moulding

Info

Publication number
GB1427670A
GB1427670A GB1386874A GB1386874A GB1427670A GB 1427670 A GB1427670 A GB 1427670A GB 1386874 A GB1386874 A GB 1386874A GB 1386874 A GB1386874 A GB 1386874A GB 1427670 A GB1427670 A GB 1427670A
Authority
GB
United Kingdom
Prior art keywords
polyethylene
cross
foamed
blowing agent
oxybis
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
Application number
GB1386874A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CENTRE IND RES Ltd
Rotoplas Ltd
Original Assignee
CENTRE IND RES Ltd
Rotoplas Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CENTRE IND RES Ltd, Rotoplas Ltd filed Critical CENTRE IND RES Ltd
Priority to GB1386874A priority Critical patent/GB1427670A/en
Publication of GB1427670A publication Critical patent/GB1427670A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0423—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by density separation
    • B29C44/043—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by density separation using a rotating mould
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene

Abstract

1427670 Rotational casting; foamed, crosslinked polyethylene ROTOPLAS Ltd and CENTRE FOR INDUSTRIAL RESEARCH Ltd 28 March 1974 13868/74 Heading B5A [Also in Division C3] In the rotational moulding of cross-linked, foamed polyethylene, solid polyethylene having a melt flow index above 1À8 is blended with a blowing agent and cross-linking agent in a non- acidic medium and heated in a hollow mould at 190-300‹ C. while rotating the mould, e.g. about two mutually perpendicular axes, the cross-linking agent being used in an amount of 0À1-2% by wt. of the polyethylene and being an organic peroxide having a half life of 3-25 minutes and a vapour pressure not higher than 5 mm. Hg at 20‹ C. The peroxide is preferably used in the liquid state and may be 2,5-dimethyl- 2,5 - di - (tert. - butyl - peroxy) hexyne - 3 or 2,5-dimethyl-2,5-di-(tert.-butyl-peroxy) hexane. An additive for regulating the decomposition temperature of the blowing agent may be zinc oxide, zinc stearate or titanium oxide. The blowing agent may be sodium bicarbonate, 4,4<SP>1</SP>- oxybis - (benzene - sulphonyl - hydrazide), trihydrazinotriazine, dinitrosopentamethylene tetramine, or 4,4<SP>1</SP>-oxybis-(benzene-sulphonylsemicarbazide), or preferably, 1,1-azobisformamide (azodicarbonamide). The moulded article may have a solid, outer layer of a thermoplastic resin, e.g. unfoamed polyethylene, with the inner layer of the foamed, cross-linked polyethylene.
GB1386874A 1974-03-28 1974-03-28 Rotational moulding Expired GB1427670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1386874A GB1427670A (en) 1974-03-28 1974-03-28 Rotational moulding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1386874A GB1427670A (en) 1974-03-28 1974-03-28 Rotational moulding

Publications (1)

Publication Number Publication Date
GB1427670A true GB1427670A (en) 1976-03-10

Family

ID=10030860

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1386874A Expired GB1427670A (en) 1974-03-28 1974-03-28 Rotational moulding

Country Status (1)

Country Link
GB (1) GB1427670A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058762A1 (en) * 1981-02-23 1982-09-01 U.S. Peroxygen Company Method for making foamed crosslinked low density polyethylene
FR2534991A1 (en) * 1982-10-23 1984-04-27 Skf Kugellagerfabriken Gmbh Precision mouldings for bearings of plastics
GB2131341A (en) * 1982-10-23 1984-06-20 Skf Kugellagerfabriken Gmbh Plastics components of or for bearings
US4576993A (en) * 1978-09-20 1986-03-18 Raychem Limited Low density polyethylene polymeric compositions
GB2267248A (en) * 1992-05-30 1993-12-01 Rotational Mouldings Ltd Loudspeaker cabinet
GB2284540A (en) * 1993-12-07 1995-06-14 Clenaglass Electric Ltd Dishwasher or laundry washing machine having rotation moulded plastic tub
GB2305886A (en) * 1995-10-04 1997-04-23 Rotational Mouldings Ltd Loudspeaker cabinet formed by rotational moulding
GB2310160A (en) * 1996-01-11 1997-08-20 Columbus Plastics Ltd Loudspeaker Components
CN104139477A (en) * 2014-06-16 2014-11-12 中科华核电技术研究院有限公司 Method for preparing package container for intermediate/low radioactivity nuclear waste

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576993A (en) * 1978-09-20 1986-03-18 Raychem Limited Low density polyethylene polymeric compositions
EP0058762A1 (en) * 1981-02-23 1982-09-01 U.S. Peroxygen Company Method for making foamed crosslinked low density polyethylene
FR2534991A1 (en) * 1982-10-23 1984-04-27 Skf Kugellagerfabriken Gmbh Precision mouldings for bearings of plastics
GB2131341A (en) * 1982-10-23 1984-06-20 Skf Kugellagerfabriken Gmbh Plastics components of or for bearings
GB2267248A (en) * 1992-05-30 1993-12-01 Rotational Mouldings Ltd Loudspeaker cabinet
GB2267248B (en) * 1992-05-30 1995-05-31 Rotational Mouldings Ltd Loudspeaker cabinet
GB2284540A (en) * 1993-12-07 1995-06-14 Clenaglass Electric Ltd Dishwasher or laundry washing machine having rotation moulded plastic tub
GB2305886A (en) * 1995-10-04 1997-04-23 Rotational Mouldings Ltd Loudspeaker cabinet formed by rotational moulding
GB2310160A (en) * 1996-01-11 1997-08-20 Columbus Plastics Ltd Loudspeaker Components
CN104139477A (en) * 2014-06-16 2014-11-12 中科华核电技术研究院有限公司 Method for preparing package container for intermediate/low radioactivity nuclear waste

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee