JPS60206875A - Synthetic resin paint composition - Google Patents

Abstract

PURPOSE:To provide a paint compsn. which has excellent workability, storage stability, resistance to chemicals and salt water, etc. and gives a coating film having an excellent performance, by using a specified vinyl chloride copolymer resin as a vehicle. CONSTITUTION:A copolymer having an average degree of polymn. (JIS K-6271) of 100-500 composed of 90-50wt% vinyl chloride, 10-50wt% vinyl propionate and 0.1-3wt% unsaturated fatty acid, is used as a vehicle. Said vehicle, a dispersion medium (e.g. ethyl acetate or toluene), a pigment and additives are kneaded together in a ball mill.

Description

[Detailed description of the invention] In particular, workability, chemical resistance, salt water resistance,
This invention relates to a vinyl chloride-based synthetic resin coating composition that has excellent weather resistance, dispersibility, storage stability, etc., and provides outstanding coating film performance.

Synthetic resin coating compositions generally require a vehicle and a dispersion medium.

Composed of pigments, various auxiliaries, wood, metal.

Used for surface coating of synthetic resins, slate, concrete F, etc.

Generally, the properties of a coating composition are mainly controlled by the type of vehicle, and many types of vehicles have been used in coating compositions.

Vinyl chloride-based synthetic resin paint compositions use vinyl chloride-vinyl acetate, vinyl chloride-vinyl peruvionate copolymer resins, etc. as vehicles, and have superior flame retardancy, water resistance, and water resistance compared to oil-based and alkyd resin paints. Has excellent chemical resistance and weather resistance, and can be used with wood and metal.

Widely used for coating concrete, etc.

Synthetic resin paints using a vinyl chloride-vinyl acetate copolymer resin as a vehicle are widely used to improve the dispersibility and alkali resistance of synthetic resin paints using a vinyl chloride-vinyl acetate copolymer resin as a vehicle. However, the coating film strength expressed by adhesion, impact resistance, and bending resistance, weather resistance, etc. are insufficient.

Conventionally, in this technical field, it has generally been considered to introduce unsaturated carboxylic acids to improve adhesion, but products with such functional groups are generally effective against basic pigments, such as zinc white. It is generally accepted that it should not be used as a paint vehicle due to its extremely poor stability;
It is simply used as a clear material in fields such as adhesives.

In the field of paint vehicles, emphasis is placed on the stability of pigments, and it is common to copolymerize with unsaturated carboxylic acid anhydrides to impart adhesion. It is also clear that increasing the molecular weight is effective in improving coating film strength and weather resistance when the resin composition is limited, and that this objective can be achieved.
This resin has extremely poor workability and dispersibility, making it unsuitable as a paint vehicle. For these reasons, there is a need to improve coating film strength, weather resistance, etc. within a certain molecular weight range, but such coatings have not yet been provided. Therefore, with conventional vinyl chloride-based synthetic resin paints, since there are limits to the improvement of vinyl chloride-based copolymer resins using known techniques, the actual situation is that they are covered by methods that blend other expensive resins and additives. However, the compatibility of vinyl chloride copolymer resins is limited and is insufficient.

Without being bound by known concepts, the present inventors have achieved excellent dispersibility, workability, storage stability, adhesion, chemical resistance, and corrosion resistance.
The present invention was completed as a result of intensive research aimed at providing a coating composition with extremely excellent weather resistance, which is the ultimate goal of an exterior coating.

That is, the present invention contains 90 to 50% by weight of vinyl chloride.

Vinyl propionate 10-50% by weight, unsaturated fatty acid a
This is a synthetic resin coating composition containing as a vehicle a copolymer resin containing 1 to 50% by weight and having an average degree of polymerization of 100 to 500.

A feature of the present invention is that in preparing the coating composition, a limited range of copolymer compositions as vehicles, namely 90-50% by weight of vinyl chloride, 10-50% by weight of vinyl propionate, is used.
It uses a copolymer with an average degree of polymerization (J Engineering S K-6271) of 100 to 500, consisting of 1 to 50% by weight of unsaturated fatty acids α, and its effect has improved physical properties that could not previously be predicted. It will go far beyond that. In other words, it overcomes the stability against basic pigments, which was presumed to be a drawback when introducing unsaturated fatty acids, and also provides the conventional properties such as high workability, high dispersibility, high coating strength, high weather resistance, and high alkali resistance. The objective is to provide a PVC-based synthetic resin paint that maintains physical properties that were thought to be impossible.

Although the mechanism of the effect of the present invention is unknown, when the amount of unsaturated fatty acids introduced is limited to a certain range, adhesion is significantly improved without deteriorating the conventional physical properties, and this is similar to the effect of increasing molecular weight. It is thought that the film strength, weather resistance, etc. have been significantly improved.

In the present invention, 90 to 50% by weight of vinyl chloride is used during copolymerization.
and 10 to 50% by weight of Purpion-vinyl.

The unsaturated fatty acids used in the present invention are not particularly limited, but include acrylic acid and methacrylic acid.

Maremolejo, 7 maric acid, itaconic acid, aconitic acid,
For example, p-tonic acid is used. If the amount of unsaturated fatty acids added exceeds 3%, it will impair alkali resistance and storage stability.
If it is less than 11%, the adhesion and i & film strength will decrease, so 11 to 1-) is preferable.

The copolymer resin used in the present invention is produced by ordinary solution polymerization, emulsion polymerization, suspension polymerization, etc., and has an average polymerization degree of 100 to 5.
00 can be used, but as a general-purpose paint, one with an average degree of polymerization of 200 to 400 is preferable.

In addition to vinyl chloride, vinyl propionate, and unsaturated fatty acid monomers, unsaturated fatty acid anhydrides such as male anhydride, methyl, ethyl, or butyl of maleic acid, fumaric acid, acrylic acid, and methacrylic acid. A multicomponent copolymer resin using one or more monomers as the fourth component, such as esters such as vinyl acetate or vinyl butyrate, and fatty acid vinyl esters such as vinyl stearate, can also be used as a multi-component copolymer resin containing vinyl chloride-propion. It can be used in the same way as the vinyl-unsaturated fatty acid three-component copolymer resin.

Examples of the dispersion medium include, but are not limited to, esters such as ethyl acetate and butyl acetate alone or mixtures thereof, aromatic hydrocarbons such as toluene, xylene, and ethylbenzene, methyl ethyl ketone, and methyl isobutyl. Ketone mechanical mixed solvents can also be used.

When actually applying the coating composition of the present invention, in order to further improve the physical properties of the coating, various stabilizers, plasticizers, lubricating extender pigments, 1 thickener, 1 dispersant, 1 color separation inhibitor, Various additives such as anti-blocking agents are added,
Although it is a paint composition product, the vinyl chloride synthetic resin paint composition of the present invention is not restricted in any way by these additives.

The coating composition is prepared by kneading it with a pigment using a three-roll mill, a ball mill, a sand grind mill, etc. similar to those used for ordinary synthetic resin coatings.

At this time, addition of a small amount of a known pigment dispersant is effective, but unlike vinyl chloride-vinyl acetate resin paints, addition of a plasticizer is not particularly necessary.

The coating composition provided by the present invention has a dispersibility of 9 and workability.

In addition to storage stability and chemical resistance, it also has high coating strength.

Materials with high weather resistance such as iron, galvanized iron, tin,
It has sufficient adhesion to metals such as aluminum, slate, concrete, wood, etc., and can be used as a coating for a wide range of materials.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Examples Various copolymer resins having the average degree of polymerization and copolymerization composition as shown in Table 1 were mixed according to the masterbatch formulation shown in Table 2.
Disperse in paint conditioner for 20 minutes with pigments, stabilizers, and thinner, then add prepared face to achieve solids content of 46%.
A coating composition having a pigment weight concentration of 48% and a bulge of 10 μm or less was obtained.

This composition was added to J Engineering 5-G-3141, 5POO-8B+2.
A test piece was prepared by coating a dry film thickness of 30±3μ on a No. 80 polished steel plate. The coating film evaluation test was Tl5-558
2, and the weather resistance and storage stability tests of the test paints were conducted under the following conditions.

・Weather resistance is based on an accelerated weather resistance test, and was operated for 1,500 hours under conditions of 18 minutes of rain out of 120 minutes of Sunshine Carbon, and 6CPf11 surface gloss (dispersibility), accelerated yellowness 9 color difference, adhesion, and impact resistance. We conducted evaluations such as: Adhesion is based on base grain test noodles, impact resistance is J-5eK-54ooB method 5
00g×50cm)<1/2φ inch.

Fist The storage stability was determined by sealing a sample with a resin content of 20% or a uniform mixture of 50g of varnish and zinc oxide No. 109.
After heating at ~80° C. for 24 hours, those with no change such as increase in viscosity by 1 separation were considered to be passed, and those with increased viscosity and tendency to gelation were judged to be rejected.

Table 3 shows the initial gloss (dispersibility) and storage stability of the coating film.

Table 4 shows the evaluation results of the adhesion J-K8-K/558 test items and the evaluation results of accelerated weathering resistance. The results are as shown in Table 5 and Table 4. In order to achieve the purpose of the present invention, from the viewpoint of alkali resistance, gloss, etc., the amount of unsaturated fat added should be between 11 and 50% by weight, divided by its physical properties. was significantly superior.

Table 1 Note) Among the resin brands, J and K indicate comparative examples.

Table 2 1) Pigment (titanium oxide) Taibake R-820 manufactured by Ishizo Sangyo ■ 2) Stabilizer Epico Aza manufactured by Shell Kagaku ■ 3) Comparative example using a dispersion state crush gauge As a representative example of the conventional technology, the following table shows 4 A comparative test was conducted on the seed resin according to the same evaluation method as in the examples.

The results are as shown in Table 31 and Table 4, and were significantly inferior to the Examples of the present invention. Note) 00 in the table indicates that the Todoroki monomer was used.

similar).

Oa pass ・・・・・・・・・ Excellent Δ is pass ~ fail ・・・ Good Rate = 060' after 1500 hours of accelerated weathering test
Specular gloss/initial 600 specular gloss x 100 chi, yellow g=(1,28X-1,06Z)/Y (however, s
! #Y*Z is JI8 IC-540004,514
10 type (according to the definition) 9 color difference; Hafta set fist adhesion; Peeling area by goblin eye test Patent applicant: Toyo Soda Kogyo Co., Ltd.

Claims (1)

[Claims] Vinyl chloride 90-50 weight, vinyl pionate 1
A synthetic resin coating composition containing as a vehicle a copolymer resin having an average degree of polymerization of 100 to 500 and consisting of 1 to 50 weight arcs of 0 to 50 weight-1 unsaturated fatty acids.