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GB2105653A - Antistatic laminate materials - Google Patents

Antistatic laminate materials Download PDF

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Publication number
GB2105653A
GB2105653A GB08220298A GB8220298A GB2105653A GB 2105653 A GB2105653 A GB 2105653A GB 08220298 A GB08220298 A GB 08220298A GB 8220298 A GB8220298 A GB 8220298A GB 2105653 A GB2105653 A GB 2105653A
Authority
GB
United Kingdom
Prior art keywords
mesh
resin
panel
carbon
conductive
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.)
Granted
Application number
GB08220298A
Other versions
GB2105653B (en
Inventor
Bruce Robert Whewell
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.)
PREFERRED PRODUCTS Ltd
Original Assignee
PREFERRED PRODUCTS 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 PREFERRED PRODUCTS Ltd filed Critical PREFERRED PRODUCTS Ltd
Priority to GB08220298A priority Critical patent/GB2105653B/en
Publication of GB2105653A publication Critical patent/GB2105653A/en
Application granted granted Critical
Publication of GB2105653B publication Critical patent/GB2105653B/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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
    • B29C70/882—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
    • B29C70/882—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding
    • B29C70/885—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding with incorporated metallic wires, nets, films or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/20—Inserts
    • B29K2105/206—Meshes, lattices or nets
    • 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
    • B29K2707/00—Use of elements other than metals for preformed parts, e.g. for inserts
    • B29K2707/04—Carbon
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0005—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B32B2264/108—Carbon, e.g. graphite particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/38—Meshes, lattices or nets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/744—Non-slip, anti-slip

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

An anti-static laminate material comprising a glass-reinforced panel (10) having an electrically conductive mesh (12) disposed at or just below its operational surface (14). The mesh (12) is positioned near enough to the surface (14) to impart a predetermined surface conductivity to the panel. The panel surface (14) can be smooth or can have a textured, non-slip anti-glare configuration. <IMAGE>

Description

SPECIFICATION Antistatic laminate materials The present invention is concerned with antistatic laminate materials of the type which are used primarily in electronics industry as bench covering and floor covering materials to eliminate static build-up which otherwise could destroy voltage sensitive circuitry.
For the purpose of preventing such static buildup, the surface resistance of the material should lie in the range from approximately 103 to 106 ohms. per square. Conventional materials having this characteristic are produced by impregnating carbon into rubber and plastics. The latter products have, however, the disadvantage that they are difficult to bond onto the bench or floor and are not mechanically strong in service.
Furthermore, they tend to stretch which results in a poor surface finish. Another important disadvantage is that, due to the heavy carbon loading required, the materials can only be produced in black which is a rather oppressive colour for operatives.
An object of the present invention is to produce anti-static laminate materials in which the aforegoing problems are mitigated.
In accordance with one aspect of the presenl invention, there is provided an anti-static laminate material comprising a glass-reinforced plastics (GRP) panel having an electrically conductive mesh disposed therewithin at or adjacent its operational surface.
The depth of penetration of the mesh is important in that it must be near enough to the surface to impart the necessary surface conductivity. In order to maintain adequate mechanical strength, however, the mesh must also be an integral part of the resin system.
Preferably, such a material is formed by providing a mesh having a predetermined electrical conductivity, introducing a thin layer of a polyester resin onto a flat mould, laying the conductive mesh on said resin layer, urging the mesh into said resin layer and then building up the thickness of the material by the application of one or more further layers of resin and/or conventional fibreglass. When fully cured, the panel is removed from the mould, leaving a smooth antistatic surface on that face which was in contact with the mould.
The conductivity of the mesh must be carefully predetermined. When, for example, the mesh is constructed from glass cloth tissue, or other initially non-conducting material, impregnated with a dispersion of carbon or graphite and allowed to cure, it is found that the conductivity of the mesh material will decrease by about two orders of magnitude when it is later introduced into the resin. Therefore, it is necessary in this case to produce a mesh that has of the order of 100 times the conductivity that is required of the finished product.
Other conductive mesh systems may also be used. For example, a thin carbon-fibre mesh can be used. In this case also, the conductivity of the mesh is degraded on insertion in the resin and must be allowed for in obtaining a required conductivity for the final product. In all cases it is important that the mesh be adequately "wetted out" by the resin so as to form an integral part of the finished laminate.
The polyester resin is of a chosen colour and is spread onto a waxed flat mould of required dimensions. The conductive mesh is laid onto this layer of resin and the resin is preferably forced through the mesh by the application of pressure thereto, such as by a grooved roller.
As an alternative to a smooth surface finish, it is sometimes desirable for the working surface of the final product to have a non-slip, anti-glare texture of configuration. These materials are produced in the same manner as the smooth laminates, but are moulded in a special mould having a textured or non-flat surface.
Additional factors must be considered, however, in the case of products having such textured finishes. As explained above, the present material is required to have a conductive mesh at or just below the surface of the laminate. For this reason, it is not possible to apply a so-called "gelcoat" as in conventional fibre-glass moulding techniques as this would insulate the surface.
Such gel-coats are used in conventional techniques to eliminate surface imperfections such as air-bubbles and are usually formed using a thicker resin which, being thixotropic, covers the mould evenly without running. This forms the smooth shiny exterior surface of the finished product and is therefore applied first to the mould.
Normally it is allowed to cure before applying subsequent resin and glassfibre backing layers.
In order to prevent the formation of surface imperfections in the present technique, particularly in the case of the textured finish versions, it has been found advantageous to incorporate in the resin a means for reducing the surface tension of the resin, such as a silicone material. This therefore acts as an anti-bubble agent.
In other embodiments, it has been found to be advantageous to impart to the backing layers, i.e.
those applied after the conductive mesh has been inserted, a degree of electrical conductivity also.
This can be achieved by incorporating conductive particles in controlled quantities in the fibreglass resin used to build up such layers. For example, such particles could be carbon or graphite, preferably at a level of the order of 25 to 30 percent by weight.
In another embodiment, the conductive particles could be in the form of cut carbon fibres (for example, approximately 21 mm in length) dispersed into the resin in controlled quantities (for example approximately 1% by weight). This has the advantage of imparting anti-static properties to the resin whilst not changing the colour significantly.
Materials constructed as above can have the following advantages: (1) They are mechanically stronger than conventional anti-static materials.
(2) They are resistant to solder and chemicals.
(3) A semi-rigid laminate results which can be bonded easily onto the surface of a bench.
(4) The material has a smooth surface that is easy to clean.
(5) It can be made in a variety of colours.
The invention is described further hereinafter, by way of example only, with reference to the accompanying drawings, in which: Fig. 1 is a highly diagrammatic, perspective view of one embodiment of a laminate material in accordance with the present invention; Fig. 2 is a highly diagrammatic side view of the material of Fig. 1; Fig. 3 is a highly diagrammatic side view of a further embodiment of a material in accordance with the invention; Fig. 4 is a highly diagrammatic side view of another embodiment of a material in accordance with the invention; and Fig. 5 is a hignly diagrammatic side view oi yet another embodiment of a material in accordance with the invention.
The material of Figs. 1 and 2 comprises a flat panel 10 of basically electrical non-conductive glass-reinforced plastics material having a mesh 12 of electrically conductive material disposed at or immediately below its flat coating surface 14.
The thickness of the panel 10 is selected to suit requirements by building up layers of GRP in a mould.
In the embodiment of Fig. 3, the material from which the backing #16 is formed itself has conductive particles 18, e.g. of carbon or graphite, embedded therein, so that the backing 16 also has a predetermined conductivity.
Fig. 4 shows an embodiment having a textured surface finish 19 but wherein the majority of the backing layer 20 is electrically insulating.
Fig. 5 shows an embodiment having a textured surface finish 21 and where the backing layer 22 has electrically conductive particles 24 incorporated therewithin.

Claims (12)

1. An anti-static laminate material comprising a glass-reinforced plastics panel having an electrically conductive mesh disposed therewithin at or adjacent its operationally upper surface.
2. A material as claimed in claim 1. wherein the mesh is formed from an electrically insulating material, the mesh being impregnated with a dispersion of carbon or graphite particles.
3. A material as claimed in claim 1, wherein the mesh is formed from carbon fibres.
4. A material as claimed in claim 1,2 or 3, wherein said upper surface of the panel has a textured finish.
5. A material as claimed in claim 1,2, 3 or 4, including electrically conductive, particulate materials disposed in the portion of said panel below said conductive mesh.
6. A process for the manufacture of an antistatic laminate material as claimed in claim 1.
comprising the steps of; (a) providing a mesh having a predetermined electrical conductivity; (b) introducing a thin layer of a polyester resin onto a mould; (c) laying the conductive mesh on said resin layer; (d) urging the mesh into said resin layer; and (e) building up the thickness of the material by the application of at least one further layer of resin.
7. A process as claimed in claim 6, wherein the mesh is formed by impregnating an initially electrically non-conductive mesh with a dispersion of graphite.
8. A process as claimed in claim 6, wherein the mesh is formed by impregnating an initially electrically non-conductive mesh with a dispersion of carbon.
9. A process as claimed in claim 6, 7 or 8, wherein said further layer of resin contains electrically conductive particles of graphite or carbon.
10. A process as claimed in claim 9, wherein said electrically conductive particles are included in the Droportion of 25 to 30% by weight.
11. A process as claimed in any of claims 6 to 10, wherein the mould has a non-flat surface, whereby the resulting moulded panel has a textured, non-slip upper surface.
12. An anti-static laminate material substantially as hereinbefore described, with reference to the accompanying drawings.
1 3. A process for the manufacture of an antistatic laminate material, substantially as hereinbefore described with reference to the accompanying drawings.
GB08220298A 1981-07-14 1982-07-13 Antistatic laminate materials Expired GB2105653B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08220298A GB2105653B (en) 1981-07-14 1982-07-13 Antistatic laminate materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8121590 1981-07-14
GB08220298A GB2105653B (en) 1981-07-14 1982-07-13 Antistatic laminate materials

Publications (2)

Publication Number Publication Date
GB2105653A true GB2105653A (en) 1983-03-30
GB2105653B GB2105653B (en) 1984-12-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08220298A Expired GB2105653B (en) 1981-07-14 1982-07-13 Antistatic laminate materials

Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516447A1 (en) * 1991-05-29 1992-12-02 Thermo King Corporation Eutectic beams for use in refrigeration
EP2345528A3 (en) * 2010-01-18 2011-11-16 EUROCOPTER DEUTSCHLAND GmbH Manufacturing process for composite material part comprising a functional finishing layer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516447A1 (en) * 1991-05-29 1992-12-02 Thermo King Corporation Eutectic beams for use in refrigeration
EP2345528A3 (en) * 2010-01-18 2011-11-16 EUROCOPTER DEUTSCHLAND GmbH Manufacturing process for composite material part comprising a functional finishing layer

Also Published As

Publication number Publication date
GB2105653B (en) 1984-12-19

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