FR2575485A1 - WATERPROOF COATING MATERIAL - Google Patents

Abstract

THE INVENTION CONCERNS COATING MATERIALS. THE COATING MATERIAL WHICH IS THE SUBJECT OF THE INVENTION IS OF THE TYPE CONTAINING A FLUOROCARBON COPOLYMER, A PIGMENT AND A SOLVENT, AND IS CHARACTERIZED IN THAT it CONTAINS, AS A FLUOROCARBON COPOLYMER, A COPOLYLOR OF TRIFLUORO-ETHORO-ETHOLYLORO-ETHORO-ETHYLOR VINYLIDENE FLUORIDE, AND WHICH ALSO CONTAINS AN ANTI-ADHESIVE AGENT AND A LOADING MATERIAL AT A FUSION TEMPERATURE OF 1000 TO 3000C, THE STARTING COMPONENTS BEING INTRODUCED IN THE FOLLOWING PROPORTIONS (BY MASS): COPOLYMER OF TRIFLUOROCHLORO-ETHYLORO VINYLIDENE FLUORIDE: 8 TO 20; ANTI-ADHESIVE AGENT: 1.3 to 6; PIGMENT: 2 TO 20; LOADING MATERIAL: 2 TO 20; SOLVENT: Q.S.P. 100. THE INVENTION ALLOWS A WATERPROOF COATING MATERIAL TO BE OBTAINED WITH A WIDE FIELD OF APPLICATIONS AND WHICH CAN BE USED IN THE MANUFACTURE OF FOUNDRY MOLDS OF COMPLEX CONFIGURATION, AS WELL AS FOR TEMPORARY PROTECTION OF VARIOUS ARTICLES.

Description

The present invention relates to coating materials and in particular

for a subject of

waterproof coating.

  There is known a plasticized polyvinyl alcohol coating composition with additional introduction of a copolymer of methacrylic acid and sodium methacrylate, and of water glass as a gelling agent, which composition is used as a coating material. detachable protection (author's certificate

  USSR, N 726146, cl. CO 9D 5/20, 1980).

  The composition indicated is characterized by an adhesion of the coating equal to 70-80 g / cm, which makes it possible to use it only for the protection of parts of

  non-complex configuration, for example of organic glass.

  There is also known a releasable waterproof coating in the form of an ethylene-vinyl acetate film, which is used to obtain vacuum forming moldings. The film is applied to the model in the heated state and thermally stable components are applied thereto ("Tekhnologia i oborudovanie liteinogo proizvodstva", Moscow, No. 5, 1974, pp. 13-16,

  "V-process know-how book", Sintokogio Society).

  The use of this known coating does not ensure the obtaining of moldings of complex configuration, is limited by the ratio of the linear dimensions of the moldings (no greater than 2: 1), requires additional operations (heating, applications of a layer additional

thermally stable components).

  There is known a sealed coating material containing a suspension of polyvinyl fluoride and polytetrafluoroethylene, obtained by dispersion in dibutyl phthalate or in a mixture of dibutyl phthalate and dimethyl phthalate, with or without the addition of trichlorethylene, and A pigment paste which is a dispersion of black (technical carbon) in dibutyl phthalate, with or without the addition of tricresyl phosphate (British Patent No. 1308297, Cl.

19/18, 1973).

  This material has an applicatiorslimité domain (it is used as a non-releasable coating of

  protection of metals) and can not be used in foundries.

  It has therefore been proposed, by a suitable choice of its components, to prepare a waterproof coating material having a wide range of applications and which can be used in the manufacture of complex configuration foundry molds, as well as for a wide range of applications.

  temporary protection of various items.

  The solution consists in that the material proposed as sealing material, of the type comprising a fluorocarbon copolymer, a pigment and a solvent, contains, according to the invention, as fluorocarbon copolymer, a copolymer of trifluorochloro-ethylene and vinylidene fluoride, and further contains a release agent and a filler with a melting temperature of 1000 to 3000 C, the starting constituents being introduced in the following proportions (% by weight): trifluorochloro-ethylene copolymer and of vinylidene fluoride .......

  8-20 anti-adhesive agent ...................... 1,3-6 pigment ............... DTD: ............... 2-20 load material ...................... 2-20..DTD: solvent ................... qsp 100.

  The invention will be better understood and other objects, features and advantages of the invention will become apparent

  better to read the following description of

  different embodiments of the invention.

  As a nonstick, the composition

  claimed preferably contains a distillate residue

  resulting from the production of synthetic fatty acids, containing up to 85% / of fatty acids, of which 50% are polymeric acids with an average number of carbon atoms in

  the molecule of 36; 20-30% are macro-fatty acids

  C19-C29 molecular weight, with the remainder being 1C acids, and non-soluble resinous acid esters of distillate dichloride or with disubstituted diphenyl ether; with chloroparaffin in a respective ratio of 1 to 6-2). or a liquid È, this polysiloxane of a molecular molecule of (5r8) O2 I or a mixture thereof. with chlorinated diphenyl or

  in a ratio of 1i (05-1) respec-

  As a filler, the claimed composition preferably contains a filler

  at a melting temperature of 1000 to 3000 C.

  As a filler, the claimed composition preferably contains an oxide of a valence element equal to 2: 4, for example alumina, dioxide, and the like.

  of zirconium or silicon dioxide.

  As a pigment, the claimed composition may contain any suitable known pigment, preferably titanium dioxide or a mixture of dioxide.

  of titanium and black (technical carbon).

  The claimed waterproof coating material contains as a fluorocarbon copolymer a copolymer of trifluorocloro-ethylene and vinylidene fluoride, which has a limited solubility and, therefore, use at a concentration greater than 20% by weight is not rational. The ratio of pigment, filler and binder (copolymer) does not exceed 1.1: 1. The release agent content does not exceed 6% by weight, since it may cause an increase in curing time, while a content of less than 1.3% by weight does not ensure

detachment from the floor.

  The composition claimed is as follows.

  The trifluorochlorinated copolymer is dissolved

  ethylene and vinylidene fluoride in a mixture of solvents. The pigment and a portion of the binder in solution are dispersed in a ball mill or glass bead mill. The pigment paste obtained is mixed with the other part of the solution of plastic fluoride, in which a release agent is introduced beforehand. The required viscosity is obtained by addition of solvents, after which the finished coating material is filtered. The claimed composition, by virtue of the chosen qualitative and quantitative component ratios, has a wide range of applications, it can be used in the production of complex configuration foundry molds, whose linear dimension ratios exceed 4: 1; it can also be used for a

  temporary protection of various items.

  Several concrete but nonlimiting examples of obtaining the coating material according to

  the invention are described below.

EXAMPLE 1

  The claimed composition contains the following components (% by weight): trifluorochloroethylene copolymer and vinylidene fluoride ..........

  . 8.0 polysiloxane liquid of molecular weight (5-8) -10 ............... DTD: 1.6 chlorinated paraffin ............ ............ 0.8 titanium dioxide ...... DTD: ................. 1.0 black (technical carbon ) ................. 1.0 aluminum oxide ........................ 2 , 0 mixture of acetone ,. butyl acetate, ethyl acetate and toluene (in a ratio of 1.5: 3.5: 1: 1 respectively) ................. complement to..DTD: 100.

  The composition is prepared as follows. 8 g of trifluorochloroethylene copolymer and of vinylidene fluoride are dissolved in a mixture of acetone, butyl acetate, ethyl acetate and toluene, in a ratio of 1.5: 3.5: 1: 1, respectively. We disperse

  1 g of titanium dioxide, 1 g of black and 2 g of dioxide.

  of aluminum in 1/4 part of the copolymer solution in a glass or ball mill, up to

  a degree of grinding of 30 to 50 microns.

  The paste obtained is then mixed with the other part of the copolymer solution, into which 1.6 g of polysiloxane liquid has been introduced beforehand.

and 0.8 g of chlorinated paraffin.

  The mixture obtained is filtered and the target product is obtained. The qualitative characteristic of the product

  referred to is indicated in the Table given below.

EXAMPLE 2

  The claimed composition contains the following components (% by weight): copolymer of trifluorochloroethylene and vinylidene fluoride .....

  .... 8.0 distillation residue from the production of fatty acids, containing about 85% fatty acids and about% unsaponifiable resinous substances ................ ........ 0,8 chlorinated diphenyl ..... DTD: ...................... 0,5 titanium dioxide .. ....................... 2, 0 zirconium dioxide ..................... 2.0 mixture of acetone, butyl acetate, ethyl acetate and toluene in a ratio of 1.5: 3.5: 1: 1, respectively .......... .............. complement..DTD: to 100.

  The indicated composition is prepared in a manner

  analogous to that described in Example 1.

  The qualitative characteristic of the composition

  obtained is indicated in the Table given below.

EXAMPLE 3

  The claimed composition contains the following components (% by weight): copolymer of trifluorochloro-ethylene and vinylidene fluoride .......

  . 15.0 polysiloxane liquid of molecular weight (5-8) - 102 ........... 3.0 chlorinated diphenyl .................... 3.0 titanium dioxide ............ DTD: ..... .. 2.5 black ............................. 2,5 aluminum oxide ....... DTD : ............ 5.0 mixture of acetone, butyl acetate, ethyl acetate and toluene (in a ratio of 1.3: 3.5: 1 : 1, respectively) ..... DTD: ............ complement to 100 ... DTD: The composition is prepared as in Example 1.

  The qualitative characteristic of the composition obtained

  is indicated in the Table given below.

EXE.PLE 4

  The claimed composition contains the following components (% by weight): copolymer of trifluorochloro-ethylene and vinylidene fluoride .......

  20.0 polysiloxane liquid of molecular weight (5-8) -102 .............. DTD:. 5.0 titanium dioxide ...................... 2.0 aluminum oxide ....... DTD: ...... ......... 20.0 mixture of acetone, butyl acetate, ethyl acetate and toluene (in a ratio of 1.5: 3.5: 1: 1, respectively) ) ..... DTD: ............... complement to 100 ... DTD: The composition is prepared as in Example 1.

  The qualitative characteristic of the composition

  obtained is indicated in the Table given below.

EXAMPLE 5

  The claimed composition contains the following components (% by weight): c.polymer of trifluorochloro-ethylene and of vinylidene fluoride ......

  ... 15.0 distijlation from synthetic fatty acid roductioa, containing about 85% fatty acids and about 15% unsaponifiable resinous substances ....... 1.5 chlorinated parabfine .... ...... DTD: ........... 3.0 dio: titanium yde ................... 5.0 dioxide of silicon ....................... 5.0 mixture of acetone, butyl acetate, ethyl acetate and toluene (in a ratio of 1.5: 3.5: 1: 1, respectively) ..................... complement to 100 ... DTD: The composition is prepared as in Example 1.

  The qualitative characteristic of the composition

  obtained is indicated in the Table given below.

EXAMPLE 6

  The claimed composition contains the following components (% by weight): copolymer of trifluorochloroethylene and vinylidene fluoride .......

  . 20.0 distillation residue from the production of synthetic fatty acids, containing about 85% of fatty acids and about 15% of unsaponifiable resinous substances .................. ... 3.0 titanium dioxide ...................... 20.0 silicon dioxide ............. ......... 2.0 mixture of acetone, butyl acetate, ethyl acetate and toluene (in a ratio of 1.5: 3.5: 1: 1, respectively) ........ ............ DTD:. complement to 100 ... DTD: The composition is prepared as in Example 1.

  The qualitative characteristic of the composition

  obtained is shown in the Table given below.

Board

  7 Degrees of permeability time of grinding of drying to the gases of the film, for example

  Croiposition, of the fourteen

  p! e, microns up to tional I degree at 800C. min

1 2 3 4

I 30-50 2-3 1.0- 9-9

4. _ _ _ _ _ _ _! _! _ _I _! __ fII

4 -1 - 1__

- - (8-9) -10o14

6 __ __ _

  Table (continued) No. Adhesion Use of example exem composition By the method In peeling peel, peel, g / cmlOa g / cm, 102pa i 5 6 7 1 20 19,614 2,19,614 castings were obtained ferrous and non-ferrous metals, of which

4 40 39,228 dimensional reports

  440 39,228 linear sions were greater than 4: 1 0 19,614 6,40 39,228 nonferrous metal castings were obtained with linear aspect ratios greater than 4: 1. the manufacture of complex configuration foundry molds having linear aspect ratios greater than 4: 1 by the vacuum molding method. The composition can also be used as a releasable waterproof coating for the temporary protection of various articles against corrosion during storage and transport, for the protection of paint and varnish coatings.

  dirt and mechanical destruction.

R E V E O D I C A T I 0 N S

  1.- waterproof coating material of the type comprising a fluorocarbon copolymer, a pigment and a solvent, characterized in that it contains as a fluorocarbon copolymer a copolymer of trifluorochloro-ethylene and vinylidene fluoride, and that it also contains a release agent and a filler with a melting point of 1000 to 3000 ° C., the starting components being introduced in the following proportions (% by weight): copolymer of trifluorochloroethylene and of vinylidene fluoride ... ..... 8 to 20 anti-adhesive agent ..................... 1.3 to 6 pigment ............. .......

  ........ 2 to 20 charging material ..................... 2 to 20..DTD: solvent ....... ............... qs 100.

  2.- Coating material according to the claim

  1, characterized in that as an anti-

  adhesive it contains a distillation residue from the production of synthetic fatty acids containing about 85% of fatty acids, of which 50% are polymer acids with an average number of carbon atoms in the molecule equal to 36, while 20 to 30% are C19 to C29 macromolecular fatty acids, the remainder being

  up to C19, and about 15% of residues

  nonsaponifiable seeds, or a mixture of the said distillation residue with chlorinated diphenyl or paraffin

  chlorinated in a ratio of 1: 0.6 to 1: 2, respectively.

  3. A coating material according to claim 1, characterized in that, as a release agent, it contains a polysiloxane liquid having a molecular weight of 5 to 8-102, or a mixture of said liquid with chlorinated diphenyl or paraffin

  chlorinated in a ratio of 1: 0.5 to 1: 1, respectively.

  / -material according to one of the first. 3, characterized by the fact that, as a charge, at a melting temperature of 1000 to 000, it contains an oxide of a monomer having a valence of 2 to 4. Coating material according to

  claim 4, characterized in that as oxy-

  of the element having a valence of 2 to 4 it contains aluminum oxide, silicon dioxide or

zirconium dioxide.

  6.- Coating material according to the Vune des

  claims 1 to 5, characterized in that

  pigment it contains titanium dioxide or a mixture

of titanium dioxide and black.