JPS6040465B2 - Coating composition for plastic sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating composition for plastics, particularly an ABS resin monochloride resin kneaded sheet (hereinafter referred to as an ABS-PVC kneaded sheet).

). A-PVC kneaded sheets are thermoplastic and can be easily molded, so they are widely used as interior parts for automobiles. however,
The ABS-PVC mixed twill sheet has defects such as decreased elongation retention due to sunlight, discoloration, and cracks due to impact at low temperatures.

Therefore, the surface of the molded product of the ABS-PVC kneaded sheet is generally coated for the purpose of improving light resistance, etc., or providing a fender effect and aesthetic appearance. The paint used for this purpose is, for example, a mixture of a homopolymer or copolymer of alkyl esters of acrylic acid or methacrylic acid and polyvinyl chloride, etc. in a desired ratio, which is dissolved in an organic solvent, and then a pigment is added. What has been done is known.

Although the above-mentioned conventional paints mainly composed of acrylic resin and polyvinyl chloride resin have the advantage of being inexpensive and easy to work with, the resulting paint quality may discolor due to sunlight or may be difficult to form into sheets. Especially when the expansion rate is large, cracks occur, which is unsatisfactory.

Polyurethane resins have also been tried as coating film forming components.

As related polyurethane resins, those using polyester polyol as a polyol component, those using polyether polyol, and those using a combination of both are known, but polyester polyurethane Hydrolysis resistance is generally low, and although polyether polyurethane has improved hydrolysis resistance, it has significantly poor heat deterioration resistance. In addition, polyester polyether polyurethane has an intermediate durability between polyester and polyether polyurethanes, although it is sufficient in either case. In view of the above points, the present inventors have carried out various studies on polyurethane resins that exhibit excellent physical properties when used in Amo-PVC kneaded sheets, and as a result, have selected and used carbonate polyester polyurethane in particular as the polyurethane resin. It was discovered that a film-forming agent with excellent light and heat resistance properties could be obtained by this method, and the present invention was completed.

That is, the present invention is a coating composition for an ABS resin-polypinyl chloride resin mixed wire sheet, which is characterized in that carbonate polyester polyurethane alone or a mixture with a polyvinyl chloride resin is dissolved in an organic solvent. To explain the present invention in more detail, the polycarbonate polyester polyurethane used in the present invention is a polyurethane consisting of a polyol, a polyisocyanate, and optionally a chain extender, and the polyol is a polycarbonate polyol or 1,10-decane. It is a polyester polyol consisting of dicarboxylic acid and polycarbonate polyol.

The polycarbonate polyol is obtained by condensing a conventionally known polyhydric alcohol with phosgene, chloroformate, dialkyl carbonate, or diallyl carbonate, and is known to have various molecular weights. Particularly preferred as such polycarbonate polyols are those using 1,6-hexanediol, 1,4-butanediol, 1,3-butanediol, neobentyl glycol or 1,5-pentanediol as the polyhydric alcohol. , and its molecular vines are about 300~
15,000, and its hydroxyl value is in the range of about 20-300. Such a polycarbonate polyol may be used alone, but it is also possible to use it in combination with a polyhydric alcohol as described above. For the purpose of the present invention, the polyester polyol consisting of the brewing component and alcohol component as described above preferably has a molecular weight of about 300 to 22,00u and a hydroxyl value of about 5 to 300. Although it is preferable to use it alone, it is also possible to use it in combination with other polyester polyols, polyether polyols, or polyester-polyether polyols known for polyurethane production.

When used in combination, the amount of other polyols is preferably about 3 parts by weight or less per 10 parts by weight of polycarbonate polyol; if this range is exceeded, the desired effect cannot be obtained. The polyisocyanates to be reacted with the above specific polyester polyols include tolylene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), and xylene diisocyanate (XDI).
, 1,5-naphthylene diisocyanate (NDI), hexamethylene diisocyanate (HDI), water addition TD
1, water addition MD1, isophorone diisocyanate (IP
DI), lysine isocyanate (LDI), isopropylidene bis(4-cyclohexyl isocyanate) (I
PCI) and other known polyisocyanates can be used.

From the viewpoint of light resistance of the resulting polyurethane, it is preferable to use aliphatic or aliphatic polyisocyanates, and from the viewpoint of cost and physical properties, water-added Mml, IP
DI etc. are particularly suitable. When producing polyurethane from the above-mentioned polycarbonate polyol and polyisocyanate, the above-mentioned polyhydric alcohol, aliphatic polyamine, alicyclic polyamine, aromatic polyamine,
It is preferred to use appropriate amounts of chain extenders known in the art, such as aromatic polyamines and the like. In the present invention, the above-mentioned polycarbonate polyester polyurethane alone can be used as the main component of the paint; etc. can also be used in combination.

The polycarbonate polyesterpo IJ urethane or vinyl chloride resin may be used in combination with one or more organic compounds selected from methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, etc. It is dissolved in a solvent and further added with organic pigments, inorganic pigments, antioxidants, ultraviolet absorbers, etc. as necessary to form a paint.

The present invention will be specifically explained below using Examples.

In addition, in Examples and Comparative Examples, parts mean parts by weight. Example 1 Three pots of diethyl carbonate and 708 parts of 1,6-hexanediol were reacted at 120°C to 200°C for 1 hour, then cooled to 150 qo and depressurized to produce ethanol remaining as 30 to 50 Hg. Thoroughly remove the crab, 786
A polycarbonate polyol was obtained.

The hydroxyl value of this polyol is about 427. In this polyol, 236 parts of 1,6-hexanediol and 1,1
Add 920 parts of 0-decanedicarboxylic acid and add about 200 to 2
The reaction was carried out for 8 hours at 20 oo of Hg, and the reaction was carried out under reduced pressure at 30 to 50 Hg to finally obtain a polycarbonate polyester polyol having a base of 175. The molecular weight of this polyol was about 1,647, and its hydroxyl value was about .
This polyol 15 base, 1,6-hexanediol 5
A polycarbonate polyester polyurethane was obtained by reacting 1 part, 2 parts of isophorone diamine, and a water-added MD16 part at about 80 to 120 DEG C. for about 8 hours. Next, 50 parts of the polyurethane obtained above was dissolved in a mixed solvent of 24 parts of methyl ethyl ketone and 15.8 parts of toluene, and further added with 6 parts of copper phthalocyanine blue, 4 parts of rutile titanium oxide, 0.1 part of an antioxidant, and an ultraviolet absorber. A coating composition was obtained by adding 0.1 part. The above coating composition was further mixed with 7% by weight of toluene, 2% by weight of methyl lysoptyl ketone, and 1% by weight of xylene.
Iwata Cup NK# paint viscosity with a diluent consisting of % by weight of
2 A dry coating film thickness of 8 to 10 was applied to an ABS-PVC falconry sheet that had been adjusted to 9.9 steps/2yC and whose surface had been cleaned in advance.
〃Spray paint to make it look like 3.
After drying for several minutes, the performance of the coating film was tested using a light resistance tester (fade-o-meter). The results are shown in Table 1.

Example 2 The same polycarbonate polyester polyurethane used in Example 1 was mixed with 4 parts of vinyl chloride-vinyl acetate copolymer, 28 parts of methyl ethyl ketone, and 17.8 parts of toluene.
Copper phthalocyanine Flu 6
1 part, 4 parts of rutile titanium oxide, 0.1 part of an antioxidant, and 0.1 part of an ultraviolet absorber to obtain a coating composition.

The above coating composition was further diluted with a diluent consisting of 7% by weight of toluene, 2% by weight of methyl isobutyl ketone, and 1% by weight of xylene to reduce the coating viscosity to Iwata Cup NK#2 9.9 seconds/
ABS- adjusted to 25oo and then cleaned the surface in advance.
Spray paint on a PVC Tsururen sheet to a dry coating thickness of 8 to 104, dry at 100 to 120 circles for 3 minutes,
The performance of the coating film was tested using a light resistance tester (fade-o-meter) and the results are shown in Table 1. Example 3 The same polycarbonate polyester polyurethane 3 base used in Example 1, 8 parts of vinyl chloride-vinyl acetate copolymer, 31 parts of methyl ethyl ketone, and 20.8 parts of toluene were added.
Copper phthalocyanine Flu 6
1 part, 4 parts of rutile titanium oxide, 0.1 part of an antioxidant, and 0.1 part of an ultraviolet absorber to obtain a coating composition.

The above coating composition was further adjusted to a coating viscosity with a diluent consisting of 7% by weight of toluene, 2% by weight of methyl isobutyl ketone, and 1% by weight of xylene.
ABS- which was adjusted to 25qC and then the surface was cleaned in advance.
A PVC mixed twill sheet was spray-painted to a dry film thickness of 8 to 10 μm, and after drying at 100 to 12 mm for 3 minutes, the performance of the paint film was tested using a light resistance tester (fade-o-meter). . The results are shown in Table 1. Comparative Example One base material of bichloride-pinyl acetate copolymer and 10 parts of polymethyl methacrylate were dissolved in a mixed solvent of 42 parts of methyl ethyl ketone and 27.8 parts of toluene, and further 6 parts of copper phthalocyanine blue, 4 parts of rutile-type titanium oxide, and 10 parts of polymethyl methacrylate were dissolved. Inhibitor 0
．． 1 part and 0.1 part of an ultraviolet absorber were added to obtain a coating composition.

The above coating composition was further diluted with a diluent consisting of 7% by weight of toluene, 2% by weight of methyl isobutyl ketone, and 1% by weight of xylene to reduce the coating viscosity to Iwata Cup NK#2 9.9 sand/
ABS- adjusted to 25oo and then cleaned the surface in advance.
A PVC kneaded sheet was spray coated to a dry coating thickness of 8 to 10 degrees, and after drying at 100 to 120 qo for 3 minutes, a performance test for coating strength was performed using a light resistance tester (fade-o-meter).

The results are shown in Table 1. Table 1 The numbers in Table 1 are faded.・O-meter [Black panel temperature 83±3°C] After conducting a light resistance test for each hour on the painted ABS-PVC kneaded sheet, a sample was prepared using a No. 1 dumbbell, and JIS
A tensile test was conducted on K6301 and the elongation rate (%) was measured at room temperature 2.
500.

Claims (1)

[Claims] 1. A coating composition for an ABS resin-vinyl chloride resin kneaded sheet, characterized in that carbonate polyester polyurethane alone or a mixture with a vinyl chloride resin is dissolved in an organic solvent.