WO1991002607A1 - Agent de demoulage utilisant du caoutchouc silicone vulcanisable - Google Patents

Agent de demoulage utilisant du caoutchouc silicone vulcanisable Download PDF

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Publication number
WO1991002607A1
WO1991002607A1 PCT/AU1990/000358 AU9000358W WO9102607A1 WO 1991002607 A1 WO1991002607 A1 WO 1991002607A1 AU 9000358 W AU9000358 W AU 9000358W WO 9102607 A1 WO9102607 A1 WO 9102607A1
Authority
WO
WIPO (PCT)
Prior art keywords
pattern
sand
mould
release agent
silicone rubber
Prior art date
Application number
PCT/AU1990/000358
Other languages
English (en)
Inventor
John Ridnell
Original Assignee
Fentak Pty.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 Fentak Pty.Ltd. filed Critical Fentak Pty.Ltd.
Publication of WO1991002607A1 publication Critical patent/WO1991002607A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns

Definitions

  • the present invention relates to release agents and in particular to release agents used in conjunction with sand moulds.
  • the sand moulds are fabricated by mixing the sand with a binder (usually resin)., typically of clay or resinous material, and then forming the binder and sand mix around a "pattern" having the shape of the article which it is eventually desired to cast; the pattern being fabricated from say timber or other appropriate material.
  • a binder usually resin
  • sand moulds typically of clay or resinous material
  • a release agent comprising a dispersion or solution of room temperature vulcanisable silicone (RTV) rubber and a suitable organic solvent in proportions such that the rubber may be applied to the pattern as a relatively thin coat with the solvent evaporating relatively soon after application so as to permit curing.
  • RTV room temperature vulcanisable silicone
  • the present invention additionally teaches a method of ensuring ready release of a pattern from a sand mould of the type above described by means of the steps of a) coating the pattern with a release agent as above described
  • TM room temperature vulcanising silicone rubber which uses an Oxime as the vulcanising agent acts as an effective release agent which will adhere to timber, plastic and metal patterns so as to form a reasonably durable release agent whereas it will not adhere to the sand mould.
  • the RTV silicone rubber may be simply coated on to the pattern with a brush spray or other suitable means in a relatively thin coat (so as not to effect substantially the shape of the mould) it is dispersed in dry toluene solvent in a ratio of 15/85 rubber to toluene by weight.
  • the dispersion process involves introduction of the rubber beneath the toluene surface and mixing in an air free closed container so as to exclude the presence of water.
  • the resulting solution is not so viscous as to present application difficulties and may be readily packaged and transported in liquid form having a long shelf life. These proportions additionally facilitate ready evaporation of the toluene once exposed to air and satisfactory subsequent curing of the RTV silicone rubber due to contact with moisture in the air.
  • Toluene has been selected as one of the better solvents having regard to its price, toxicity and relative volatility as compared with other solvents which would otherwise perform equally well such as trichloroethane, benzene, xylene, solvent naptha, mineral spirits, mineral terpentine or other organic solvents that are non reactive with the RTV rubber or the mould surface and yet are sufficiently volatile to evaporate rapidly when applied to the mould surface.
  • a cure time of 16 hours for the release agent once coated on the pattern to a thickness of approximately .1 mm has been observed.
  • a release agent in accordance with the present invention serves to protect the pattern from attack of binder resins which may degrade the pattern.
  • the release agent additionally helps avoid damage which may result from removal of adhered binder. It has been found that with many patterns the release agent will adhere to the pattern during the course of fabrication of 10 or more moulds irrespective of the type of binder used to bond the sand.
  • the release agent will eventually become mechanically eroded depending upon handling methods and the shape of the pattern although the pattern may be readily "touched up" with release agent in accordance with the present invention at the spots where it tends to wear.
  • the relative proportions of solvent to rubber may be varied according to the thickness of rubber required as a release agent and the desired cure time. Alternate solvents may additionally be utilised according to the vulcanising agent utilised in the rubber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

Pour le moulage d'article en métal on utilise des moules de sable dont l'enveloppe de sable moulée est brisée pour permettre le démoulage de l'article, après le coulage du métal et son refroidissement. Généralement, pour fabriquer des moules de sable, on mélange le sable avec un liant argileux ou résineux, on façonne l'enveloppe de moulage autour d'un modèle en bois, en plastique ou en métal pour former le moule, puis on sépare le modèle du moule. Le sable aggloméré a cependant tendance à coller au modèle, au détriement du modèle et du moule, ce qui a pour conséquence un taux de rejets d'environ 20 %, ce problème survenant avec une grande variété de liants connus utilisés jusqu'ici. Pour éliminer ce problème, on prépare un agent de démoulage se présentant sous la forme d'une dispersion ou d'une solution de caoutchouc silicone vulcanisable à température ambiante, placé dans un solvant organique volatil, qu'on applique comme couche de revêtement sur le moule en l'étendant, en le vaporisant ou en utilisant d'autres moyens appropriés. Divers solvants, tels que du trichloréthane, du benzène, du toluène, du xylène, du naphtha solvant, des alcools dénaturés, et de l'essence de térébenthine artificielle peuvent être utilisés, avec une préférence pour le toluène, selon un rapport en poids toluène/caoutchouc silicone de 96/4 à 50/50. La solution ou la dispersion permet l'application d'une couche de revêtement en caoutchouc silicone de 0,01 à 1,00 mm d'épaisseur, fermement attachée au modèle après une période de vulcanisation d'environ 16 heures à une température de 25 °C, ainsi qu'une diminution sensible du taux de rejet. L'entretien de la couche de revêtement vulcanisé est relativement simple et ne nécessite que quelques retouches aux points d'usure, lorsqu'ils apparaîssent.
PCT/AU1990/000358 1989-08-18 1990-08-17 Agent de demoulage utilisant du caoutchouc silicone vulcanisable WO1991002607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ5871 1989-08-18
AUPJ587189 1989-08-18

Publications (1)

Publication Number Publication Date
WO1991002607A1 true WO1991002607A1 (fr) 1991-03-07

Family

ID=3774122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000358 WO1991002607A1 (fr) 1989-08-18 1990-08-17 Agent de demoulage utilisant du caoutchouc silicone vulcanisable

Country Status (1)

Country Link
WO (1) WO1991002607A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008015966A1 (de) * 2008-03-20 2009-09-24 Itn Nanovation Ag Herstellung von Formteilen für Gießereizwecke
US8303749B2 (en) * 2009-10-13 2012-11-06 Chien-Hung Lee Method for manufacturing composite film
PT10920U (pt) * 2012-09-25 2013-10-29 Joao Policarpo Roquette Pinheiro De Melo Massa à base de areia calibrada e aglomerante elástico
JP2021519382A (ja) * 2018-04-02 2021-08-10 エニーメディ インコーポレーテッド ３ｄ模型用のコーティング液組成物及びこれを用いた３ｄ模型の製造方法

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU342722A1 (ru) * Московский автомобильный завод И. А. Лихачева ОСНАЯ Разделительное покрытие при изготовлении литейных форм и стержней по горячей оснастке
US1996283A (en) * 1929-01-28 1935-04-02 Beloit Iron Works Facing material for sand molds
US2127534A (en) * 1929-01-12 1938-08-23 Jr Charles Marshall Saeger Process and product for coating molds and cores
FR1058315A (fr) * 1952-06-13 1954-03-16 Boehler & Co Ag Geb Perfectionnement à la coulée à la barre de métaux à point de fusion élevé en coquille métallique refroidie
FR1083505A (fr) * 1953-04-29 1955-01-10 Rech S Etudes Procédé pour éviter les soufflures ou refus sur les pièces moulées de fonderie
FR1274165A (fr) * 1960-11-23 1961-10-20 Thomson Houston Comp Francaise Enduit pour lingotière
US3047917A (en) * 1959-06-29 1962-08-07 Allegheny Ludlum Steel Silicone mold coating
DE1901858A1 (de) * 1969-01-15 1970-08-20 Goldschmidt Ag Th Trennmittel
US3654985A (en) * 1970-05-14 1972-04-11 Edwin M Scott Jr Process for die casting brass using a silicone lubricant
GB1275870A (en) * 1969-06-06 1972-05-24 Sulzer Ag Improvements in and relating to coating compositions for foundry patterns and core boxes
SU366914A1 (fr) * 1971-08-02 1973-01-23
EP0254274A2 (fr) * 1986-07-22 1988-01-27 Toray Silicone Co., Ltd. Méthode de démoulage

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU342722A1 (ru) * Московский автомобильный завод И. А. Лихачева ОСНАЯ Разделительное покрытие при изготовлении литейных форм и стержней по горячей оснастке
US2127534A (en) * 1929-01-12 1938-08-23 Jr Charles Marshall Saeger Process and product for coating molds and cores
US1996283A (en) * 1929-01-28 1935-04-02 Beloit Iron Works Facing material for sand molds
FR1058315A (fr) * 1952-06-13 1954-03-16 Boehler & Co Ag Geb Perfectionnement à la coulée à la barre de métaux à point de fusion élevé en coquille métallique refroidie
FR1083505A (fr) * 1953-04-29 1955-01-10 Rech S Etudes Procédé pour éviter les soufflures ou refus sur les pièces moulées de fonderie
US3047917A (en) * 1959-06-29 1962-08-07 Allegheny Ludlum Steel Silicone mold coating
FR1274165A (fr) * 1960-11-23 1961-10-20 Thomson Houston Comp Francaise Enduit pour lingotière
AU5715965A (en) * 1964-08-10 1966-10-06 Dow Corning Corporation Release agents
AU641366A (en) * 1965-11-22 1967-12-07 Dow Corning Corporation Organo siloxane mould release agent
AU5402969A (en) * 1968-10-07 1970-11-05 Dow Corning Corporation Organosilane mold lubricants
DE1901858A1 (de) * 1969-01-15 1970-08-20 Goldschmidt Ag Th Trennmittel
GB1275870A (en) * 1969-06-06 1972-05-24 Sulzer Ag Improvements in and relating to coating compositions for foundry patterns and core boxes
US3654985A (en) * 1970-05-14 1972-04-11 Edwin M Scott Jr Process for die casting brass using a silicone lubricant
SU366914A1 (fr) * 1971-08-02 1973-01-23
EP0254274A2 (fr) * 1986-07-22 1988-01-27 Toray Silicone Co., Ltd. Méthode de démoulage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Section I, Chemical, issued February 1973, (DERWENT PUBLICATIONS LTD., London, England); & SU,A,342 722 (I.A. LIKHACHEV MOTOR CAR FACTORY), 18 July 1972. *
SOVIET INVENTIONS ILLUSTRATED, Section I, Chemical, Volume U, Number 40, issued 8 November 1973, (DERWENT PUBLICATIONS LTD., London England); & SU,A,366 914 (CASTING ENGINEERING, CASTING TECHNOLOGY AND AUTOMATIC CASTING RESEARCH INSTITUTE), 6 March 1973. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008015966A1 (de) * 2008-03-20 2009-09-24 Itn Nanovation Ag Herstellung von Formteilen für Gießereizwecke
US8303749B2 (en) * 2009-10-13 2012-11-06 Chien-Hung Lee Method for manufacturing composite film
PT10920U (pt) * 2012-09-25 2013-10-29 Joao Policarpo Roquette Pinheiro De Melo Massa à base de areia calibrada e aglomerante elástico
JP2021519382A (ja) * 2018-04-02 2021-08-10 エニーメディ インコーポレーテッド ３ｄ模型用のコーティング液組成物及びこれを用いた３ｄ模型の製造方法
EP3778806A4 (fr) * 2018-04-02 2022-02-16 Anymedi Inc. Composition liquide de revêtement pour modèle 3d et procédé de fabrication d'un modèle 3d l'utilisant
JP7111883B2 (ja) 2018-04-02 2022-08-02 エニーメディ インコーポレーテッド ３ｄ模型用のコーティング液組成物及びこれを用いた３ｄ模型の製造方法並びに３ｄ模型用のコーティング液組成物の製造方法

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