WO1994010252A1 - Coating composition based on polystyrene - Google Patents

Coating composition based on polystyrene Download PDF

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Publication number
WO1994010252A1
WO1994010252A1 PCT/EP1993/002950 EP9302950W WO9410252A1 WO 1994010252 A1 WO1994010252 A1 WO 1994010252A1 EP 9302950 W EP9302950 W EP 9302950W WO 9410252 A1 WO9410252 A1 WO 9410252A1
Authority
WO
WIPO (PCT)
Prior art keywords
composition
polystyrene
parts
mass
plasticizer
Prior art date
Application number
PCT/EP1993/002950
Other languages
French (fr)
Inventor
Jacobus Adriaan Venter
Original Assignee
Ultraclad (Proprietary) Limited
Octrooibureau Kisch N.V.
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 Ultraclad (Proprietary) Limited, Octrooibureau Kisch N.V. filed Critical Ultraclad (Proprietary) Limited
Priority to AU53380/94A priority Critical patent/AU5338094A/en
Publication of WO1994010252A1 publication Critical patent/WO1994010252A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • C04B41/4857—Other macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B41/4876—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/62—Coating or impregnation with organic materials
    • C04B41/63—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/06—Polystyrene

Definitions

  • THIS invention relates to coating compositions. More particularly, this invention relates to weather resistant coating compositions which are suitable for use in coating metallic, wooden or masonry surfaces.
  • a coating composition comprising polystyrene, an organic aromatic solvent in which the polystyrene is soluble, a plasticizer and a metal silicate.
  • the polystyrene may be high impact polystyrene and is most preferably crystalline polystyrene.
  • the organic aromatic solvent is preferably selected from toluene and xylene or a blend of toluene and xylene. It is also within the scope of the invention to use blends of toluene and/or xylene with additional organic solvents such as aliphatic solvents provided that the aromatic organic solvent comprises at least 65% of the total solvent content of the blend. Such additional solvents are thus preferably not present but where present it may comprise aliphatic compounds such as al anes, alkenes, alcohols, ketones, ethers, esters or halogenated alkanes and the like.
  • the plasticizer used in che composition is preferably dibutylphthalate [DBP] and the metal silicate is preferably aluminium silicate [AI2(8103)3] .
  • the major ingredients of the composition set out above are preferably present in the composition in the mass ratio polystyrene : solvent : plasticizer : metal silicate of 100 : 200 to 500 : 15 to 35 : 10 to 30.
  • the mass ratio of polystyrene : toluene or xylene : DBP : AI2(2103)3 is 100 : 333 : 25 : 16.7..
  • composition may also include any one or more of the following ingredients in the quantities indicated based on 100 parts per mass of polystyrene:
  • a flame retardant preferably of the type sold as Bromine FR 1025 by Cookson Chemicals Inc. in a quantity of between 5 and 20 parts, most prefer ⁇ ably 8 parts by mass;
  • rosin as an additional plasticizer, in a quantity of 10 to 50 parts, most preferably 25 parts, by mass;
  • an anti-fouling agent which may be tri-n-butyl tin oxide [TBTO], in a quantity of between 1 and 4, most preferably 2 parts by mass.
  • TBTO tri-n-butyl tin oxide
  • the composition may further also include one or more of a whitener such as titanium dioxide in the quantity of between 10 and 50, and most preferably 33 parts by mass, a UV stabilizer such as the product sold as TINUVIN by Ciba-Geigy (Pty.) Limited, in the quantity of between 5 and 10 and most preferably 3 parts by mass, and where required, a pigment in the quantity of between 0,1 and 1, most preferably 0,5 parts by mass.
  • a whitener such as titanium dioxide in the quantity of between 10 and 50, and most preferably 33 parts by mass
  • a UV stabilizer such as the product sold as TINUVIN by Ciba-Geigy (Pty.) Limited
  • a pigment in the quantity of between 0,1 and 1, most preferably 0,5 parts by mass.
  • compositions of the invention falling within the ranges set out above have been made up and found useful as a coating composition on substrates such as steel , masonry and wood and have been used to coat the hulls of ships and to waterproof the concrete roofs of shopping complexes and the like.
  • composition of the present invention may be made up as follows: Component and Name of Supplier of Quantity
  • the composition is made up by placing the toluene in a vessel equipped with a stirrer and adding the polysty ⁇ rene thereto with stirring at about 1500 rpm. About 75 litres of the resulting solution is thereafter removed from the vessel and transferred to a smaller mixing vessel equipped with a high speed stirrer. The Ti ⁇ 2 is then slowly added to the solution with stirring and upon being fully dispersed the resultant mixture is slowly poured back into the bulk mixture with contin ⁇ uous stirring at about 1500 rpm. This process is repeated for each of the other ingredients in the sequence Al2(Si ⁇ 3)3, zinc phosphate, DBP, UV stabilizer, polyvinylacetate and the mixture is there ⁇ after mixed for at least an hour. Finally the pigment is added and the mixture is mixed for 5 minutes. Mix ⁇ ing is thereafter stopped to allow the foam to break which usually takes about 10 minutes and the product is then packed into drums for distribution.
  • the product may be applied to a substrate to be coated in any convenient manner 'such as by brush, roller or by dipping.
  • the product may alternatively be diluted with toluene to a viscosity of 120 - 150 sec/ 5 " cup [Brook- field centipoise] and applied by spray gun or curtain coating.
  • a salt fog test in accordance with SABS method 155 was also performed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)

Abstract

A coating composition comprising polystyrene, an organic aromatic solvent in which the polystyrene is soluble, a plasticizer and a metal silicate. The coating composition may be used for coating metallic, wooden or masonry surfaces.

Description

COATING ∞MPOS-CTION BASED ON POLYSTYRENE
THIS invention relates to coating compositions. More particularly, this invention relates to weather resistant coating compositions which are suitable for use in coating metallic, wooden or masonry surfaces.
GENERAL DESCRIPTION OF THE INVENTION
According to the present invention there is provided a coating composition comprising polystyrene, an organic aromatic solvent in which the polystyrene is soluble, a plasticizer and a metal silicate.
The polystyrene may be high impact polystyrene and is most preferably crystalline polystyrene.
The organic aromatic solvent is preferably selected from toluene and xylene or a blend of toluene and xylene. It is also within the scope of the invention to use blends of toluene and/or xylene with additional organic solvents such as aliphatic solvents provided that the aromatic organic solvent comprises at least 65% of the total solvent content of the blend. Such additional solvents are thus preferably not present but where present it may comprise aliphatic compounds such as al anes, alkenes, alcohols, ketones, ethers, esters or halogenated alkanes and the like. The plasticizer used in che composition is preferably dibutylphthalate [DBP] and the metal silicate is preferably aluminium silicate [AI2(8103)3] .
The major ingredients of the composition set out above are preferably present in the composition in the mass ratio polystyrene : solvent : plasticizer : metal silicate of 100 : 200 to 500 : 15 to 35 : 10 to 30. In the most preferred form of the invention the mass ratio of polystyrene : toluene or xylene : DBP : AI2(2103)3 is 100 : 333 : 25 : 16.7..
The composition may also include any one or more of the following ingredients in the quantities indicated based on 100 parts per mass of polystyrene:
[a] zinc phosphate in a quantity of 2 to 7, but preferably 5 parts;
[b] polyvinylacetate as a sealant in a quantity of 15 to 35 parts by mass, but preferably 25 parts;
[c] a flame retardant, preferably of the type sold as Bromine FR 1025 by Cookson Chemicals Inc. in a quantity of between 5 and 20 parts, most prefer¬ ably 8 parts by mass;
[d] rosin, as an additional plasticizer, in a quantity of 10 to 50 parts, most preferably 25 parts, by mass;
[e] an anti-fouling agent, which may be tri-n-butyl tin oxide [TBTO], in a quantity of between 1 and 4, most preferably 2 parts by mass.
The composition may further also include one or more of a whitener such as titanium dioxide in the quantity of between 10 and 50, and most preferably 33 parts by mass, a UV stabilizer such as the product sold as TINUVIN by Ciba-Geigy (Pty.) Limited, in the quantity of between 5 and 10 and most preferably 3 parts by mass, and where required, a pigment in the quantity of between 0,1 and 1, most preferably 0,5 parts by mass.
Various compositions of the invention falling within the ranges set out above have been made up and found useful as a coating composition on substrates such as steel , masonry and wood and have been used to coat the hulls of ships and to waterproof the concrete roofs of shopping complexes and the like.
DETAILED DESCRIPTION OF AN EXAMPLE OF THE INVENTION
An example of the composition of the present invention may be made up as follows: Component and Name of Supplier of Quantity
Proprietary Products Kg
I. Polystyrene in the form of "Stiron
472" [Dow Chemical Co.] 100 2. Toluene in the form of Toluol [Aktol
Chemicals (Pty.) Limited] 333
3. DBP ex NCP Limited 25
4. Al£(Siθ3)3 sold as Translink by Lewis Everitt (Pty.) Limited 16,7 5. Ti0 sold as RCR 40 by ICI Limited 33,3
6. Polyvinylacetate 25
7. Bromine FR 1025 sold^by Cookson Chemicals Inc. 8
8. Tinuvin 292 [Ciba-Geigy] 1,5 9. Tinuvin 1130 [Ciba-Geigy] 1,5
10. Pigment 0,5
II. Zinc phosphate 5 12.' Resin 25 13. TBTO [Eoechst] 2
The composition is made up by placing the toluene in a vessel equipped with a stirrer and adding the polysty¬ rene thereto with stirring at about 1500 rpm. About 75 litres of the resulting solution is thereafter removed from the vessel and transferred to a smaller mixing vessel equipped with a high speed stirrer. The Tiθ2 is then slowly added to the solution with stirring and upon being fully dispersed the resultant mixture is slowly poured back into the bulk mixture with contin¬ uous stirring at about 1500 rpm. This process is repeated for each of the other ingredients in the sequence Al2(Siθ3)3, zinc phosphate, DBP, UV stabilizer, polyvinylacetate and the mixture is there¬ after mixed for at least an hour. Finally the pigment is added and the mixture is mixed for 5 minutes. Mix¬ ing is thereafter stopped to allow the foam to break which usually takes about 10 minutes and the product is then packed into drums for distribution.
The product may be applied to a substrate to be coated in any convenient manner 'such as by brush, roller or by dipping. The product may alternatively be diluted with toluene to a viscosity of 120 - 150 sec/5" cup [Brook- field centipoise] and applied by spray gun or curtain coating.
It has been found convenient to prepare the surface to be coated merely to the extent necessary to remove loose flakes and particles from the surface. No primer coating is considered necessary for normal application.
For coating steel surfaces or wood particle board surfaces it has been found that an application rate of about 3π_2 per litre applied as three coats provides an adequate protective coating having a dry film thickness of about 80 micron.
For coating masonry surfaces such as floors, walls and pools it is preferred to use a higher application rate, i.e. for pools and floors about lm^/litre and for other masonry applications about 2,6m2/litre.
A set of tests was conducted by the South African Bureau of Standards in respect of the coating prepared as described above in this example but which did not include rosin or TBTD.
Mild steel panels were coated with the coating compositions by dipping • the panels in the coating composition followed by allowing run-off to occur and allowing the panels to become touch dry between coats. Each panel was provided with three coats in this manner. On the abrasion test performed by SABS no loss of mass was found after 1500 cycles. During the direct impact resistance test [SABS Method 155] a direct impact of 20J resulted in no defects. This was also the case for indirect impact of 3J. Indirect impact of 6J caused failure.
On the scratch resistance test no penetration to substrate was found at 5000 gr.
A salt fog test in accordance with SABS method 155 was also performed.
The results of this test were as follows: Exposure time, h Evaluation
145 Initial red rust in the x-mark and red rust rundown from the x-mark, otherwise no visible defects.
200 Increase in the amount of red rust, otherwise no visible effects.
370 Slight red rust in the x-mark and red rust rundown from x-mark and initial big blisters.
500 Severe red rust and red rust rundown from x-mark. Slight big blisters and paint shows good adhesion.
1000 Very severe red rust in the x- mark and red rust rundown from x-mark and blisters. No rust creep and no loss of adhesion.
Many variations of the invention may be devised without departing from the general scope and spirit of the invention.

Claims

1. A coating composition comprising polystyrene, an organic aromatic solvent in which the polystyrene is soluble, a plasticizer and a metal silicate.
2. The composition of claim 1 wherein the polystyrene is high impact polystyrene.
3. The composition of claim 1 wherein the polystyrene is crystalline polystyrene.
4. The composition of claim 1 wherein the organic aromatic solvent is selected from the group consisting of toluene, xylene, and a blend of toluene and xylene.
5. The composition of claim 4 which includes additional solvents selected from the group consisting of the aliphatic alkanes, alkenes, alcohols, ketones, ethers, esters, and halogenated alkanes wherein the aromatic organic solvent comprises at least 65% of the total solvent content of the blend.
6. The composition of claim 1 wherein the plasticizer is dibutylphthalate [DBP].
7. The composition of claim 1 wherein the metal silicate is aluminium silicate [AI2(Siθ3)3] .
8. The composition of claim 1 wherein the mass ratio polystyrene : solvent : plasticizer : metal silicate is 100 : 200 to 500 : 15 to 35 : 10 to 30.
9. The composition of claim 8 wherein the solvent is toluene or xylene, the plasticizer is DBP and the metal silicate is Al2(Siθ3)3 and the components are present in the composition in the mass ratio of polystyrene : toluene or xylene : DBP : Al2(Si03)3 is 100 : 333 : 25 : 16.7.
10. The composition of claim 1 which further includes any one or more of the following ingredients in the quantities indicated based on 100 parts per mass of polystyrene:
[a] zinc phosphate in a quantity of 2 to 7 , but preferably 5 parts;
[b] polyvinylacetate as a sealant in a quantity of 15 to 35 parts by mass, but preferably 25 parts;
[c] a flame retardant, preferably of the type sold as Bromine FR 1025 by Cookson Chemicals Inc. in a quantity of between 5 and 20 parts, most preferably 8 parts by mass;
[d] rosin, as an additional plasticizer, in a quantity of 10 to 50 parts, most preferably
25 parts, by mass;
[e] an anti-fouling agent, in the form of tri-n- butyl tin oxide [TBTO], in a quantity of between 1 and 4, most preferably 2 parts by mass.
11. A method of protecting a metallic, wooden or masonry surface comprising the steps of applying to such surface one or more coats of a coating composition according to any one of claims 1 to 10.
PCT/EP1993/002950 1992-10-23 1993-10-22 Coating composition based on polystyrene WO1994010252A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53380/94A AU5338094A (en) 1992-10-23 1993-10-22 Coating composition based on polystyrene

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA92/8206 1992-10-23
ZA928206 1992-10-23

Publications (1)

Publication Number Publication Date
WO1994010252A1 true WO1994010252A1 (en) 1994-05-11

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Family Applications (1)

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PCT/EP1993/002950 WO1994010252A1 (en) 1992-10-23 1993-10-22 Coating composition based on polystyrene

Country Status (4)

Country Link
CN (1) CN1089633A (en)
AU (1) AU5338094A (en)
WO (1) WO1994010252A1 (en)
ZA (1) ZA937861B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105295572A (en) * 2015-12-04 2016-02-03 常熟市福达金属制件有限公司 Novel iron hoop

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387272A1 (en) * 1977-04-13 1978-11-10 Falmouth Plastic Liquid coating compsns. contg. polystyrene, solvent, plasticiser - and inhibitor of UV degradation for paints, varnishes, insulators

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387272A1 (en) * 1977-04-13 1978-11-10 Falmouth Plastic Liquid coating compsns. contg. polystyrene, solvent, plasticiser - and inhibitor of UV degradation for paints, varnishes, insulators

Also Published As

Publication number Publication date
ZA937861B (en) 1994-06-01
CN1089633A (en) 1994-07-20
AU5338094A (en) 1994-05-24

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