GB756649A - Improvements in or relating to a process for the manufacture of closed-cell cellular material of natural and/or synthetic rubber - Google Patents

Improvements in or relating to a process for the manufacture of closed-cell cellular material of natural and/or synthetic rubber

Info

Publication number
GB756649A
GB756649A GB26581/54A GB2658154A GB756649A GB 756649 A GB756649 A GB 756649A GB 26581/54 A GB26581/54 A GB 26581/54A GB 2658154 A GB2658154 A GB 2658154A GB 756649 A GB756649 A GB 756649A
Authority
GB
United Kingdom
Prior art keywords
synthetic rubber
vulcanization
disulphide
blowing agent
vulcanized
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
GB26581/54A
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.)
Rubatex Products Inc
Original Assignee
Rubatex Products Inc
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 Rubatex Products Inc filed Critical Rubatex Products Inc
Publication of GB756649A publication Critical patent/GB756649A/en
Expired legal-status Critical Current

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
    • 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
    • B29C44/027—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 the foaming continuing or beginning when the mould is opened
    • 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
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/046—Condition, form or state of moulded material or of the material to be shaped cellular or porous with closed cells

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

In a method of manufacturing a closed cell cellular article of natural and/or synthetic rubber comprising preparing a vulcanizable mix containing a blowing agent, shaping the mix to the desired shape in miniature size and confining in a mould, heating so that the blowing agent generates gas and vulcanization is effected, releasing the vulcanized material while still hot, and allowing it to expand and cool to assume its final size, the mix includes a vulcanization accelerator capable of causing the vulcanization to proceed after a particular time interval without substantial change in tensile strength and modulus of elasticity of the natural and/or synthetic rubber, and the heating is continued for at least said time interval, whereby the expansion and shrinkage of the article when released from the mould is determined only by the amount of blowing agent used, and is substantially independent of the exact period of vulcanization. The vulcanisation accelerator may comprise benzothiazyl disulphide admixed with tetramethyl thiuram disulphide, cyclohexyl-2-benzothiazole sulphenamide admixed with tetramethyl thiuram disulphide, and either alone or in combination, benzyl hexamethylene tetra-ammonium - 2 - benzothiazyl sulphide, dibenzo-thiazyl dimethyl thiourea, diorthotolyl guanidine, and tetra-ethyl thiuram disulphide. In an example, a mixture of GRS synthetic rubber, polystyrene, calcium silicate, coumarone resin, light oil, paraffin wax, stearic acid, zinc oxide, benzothiazyl disulphide, tetramethyl thiuram disulphide, sulphur, and dinitrosopentamethylene tetramine (blowing agent) is formed into shaped pieces and vulcanized in moulds of the same internal size and shape for periods up to 24 minutes. The degrees of expansion and subsequent shrinkage of the vulcanized articles when released from the moulds are found to be substantially constant after a period of 12 minutes.ALSO:In a method of manufacturing a closed-cell cellular article of natural and/or synthetic rubber material in which a vulcanizable mix of the material is prepared containing a blowing agent shaping the mix to the desired shape in minature size and confining in a mould heating the material so that the blowing agent generates gas and vulcanization is effected releasing the vulcanized material while still hot, and allowing it to expand and cool to assume its final size, the mix includes a vulcanization accelerator capable of causing the vulcanization to proceed after a particular time interval without substantial change in tensile strength and modulus of elasticity of the natural and/or synthetic rubber material, and the heating is continued for at least said time interval, whereby the expansion and shrinkage of the article when released from the mould is determined only by the amount of blowing agent used, and is substantially independent of the exact period of vulcanization. The vulcanization accelerator may comprise benzothiazyl disulphide admixed with tetramethyl thiuram disulphide, cyclohexyl-2-benzo-thiazole sulphenamide admixed with tetramethyl thiuram disulphide, and either alone or in combination, benzyl hexamethylene tetra-ammonium-2-benzothiazyl sulphide, dibenzo-thiazyl dimethyl thiourea, diorthotolyl guanidine, example a mixture in parts by weight of GRS synthetic rubber 100, high styrene and tetraethyl thiuram disulphide. In an example a mixture in parts by weight of GRS synthetic rubber 100, high styrene resin 50, calcium silicate 75, coumarone resin 5, light oil 5, paraffin wax 1.5, stearic acid 2, zinc oxide 5, benzothiazyl disulphide 2, tetramethyl thiuram disulphide 0.3 sulphur 3, and dinitroso-pentamethlylene tetramine (blowing agent) 4 is formed into shaped pieces and vulcanized in moulds of the same internal size and shape for periods up to 24 minutes. The degrees of expansion and subsequent shrinkage of the vulcanized articles when released from the moulds are found to be substantially constant after a period of 12 minutes.
GB26581/54A 1953-09-23 1954-09-14 Improvements in or relating to a process for the manufacture of closed-cell cellular material of natural and/or synthetic rubber Expired GB756649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US756649XA 1953-09-23 1953-09-23

Publications (1)

Publication Number Publication Date
GB756649A true GB756649A (en) 1956-09-05

Family

ID=22127222

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26581/54A Expired GB756649A (en) 1953-09-23 1954-09-14 Improvements in or relating to a process for the manufacture of closed-cell cellular material of natural and/or synthetic rubber

Country Status (1)

Country Link
GB (1) GB756649A (en)

Similar Documents

Publication Publication Date Title
BR0206681A (en) Reaction system suitable for the production of expanded kidney molds and mat-reinforced ld-s-rim molded foam article
GB768769A (en) Process for the preparation of odourless natural or synthetic rubber sponge
US2283316A (en) One-stage process for the manufacture of rubber
GB756649A (en) Improvements in or relating to a process for the manufacture of closed-cell cellular material of natural and/or synthetic rubber
US2290622A (en) Method of manufacturing cellular rubber
US2381380A (en) Manufacture of sponge rubber
US3855378A (en) Process for preparing cellular rubber
US2845659A (en) Production of foam rubber
US2718536A (en) Manufacture of rubber articles
US2195623A (en) Sponge rubber
US2885456A (en) Cold coagulable foamed rubber latex and sponge therefrom and process for making same
GB497908A (en) Improvements in or relating to hard rubber articles and methods of producing the same
JPS57160300A (en) Vibration diaphragm for speaker
GB388605A (en) Improvements in the manufacture and production of porous rubber
US2378701A (en) Manufacture of articles from liquid dispersions
US2825747A (en) Method for foaming rubber
US1966818A (en) Manufacture of spongy rubber or similar material
GB788024A (en) Improvements in or relating to tyres
GB573525A (en) Improvements in or relating to the production of gas expanded rubber materials
US1978481A (en) Method of molding
GB736031A (en) Improvements in or relating to the manufacture of shaped articles of micro-cellular structure
US2217606A (en) Cellular rubber and method of making the same
KR950000084B1 (en) Making method of toy ball
GB1115573A (en) Method of producing moulded articles in expanded cellular rubber
ES197715A1 (en) A PROCEDURE FOR PRODUCING RUBBER ARTICLES