JPH0967491A - Vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition excellent in thermal stability in its molding processing and in chalking resistance of the molded products thereof. SOLUTION: This resin composition comprises 100 pts.wt. of a vinyl chloride resin, a total of 0.005-1 pt.wt. of a copper o,o'-dialkyl-dithiophosphate and/or stannous acetate, and 0.1-3 pts.wt. of hydrotalcite, and pref., a coloring ingredient. When compared to conventional such compositions, this resin composition is excellent in thermal stability during its long-term molding processing under heating and weatherability of the molded products thereof, in particular, can suppress chalking of the molded products thereof such as gutters or deck materials over a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition excellent in weather resistance, particularly choking resistance, and more particularly to a colored vinyl chloride resin composition.

[0002]

2. Description of the Related Art Vinyl chloride resin is often used outdoors as a molded product such as a pipe, a rain gutter, a deck material, a window frame or the like, which is colored with a pigment or the like.

However, when a colored molded article is exposed to the outside, not only the discoloration and fading of the color but also the so-called chalking phenomenon (whitening phenomenon) occurs, in which the surface of the portion exposed to the sunlight discolors white as if it were blowing powder. However, there is a problem that the appearance is significantly impaired and the mechanical strength is also reduced.

Conventionally, in order to improve such drawbacks, heat stabilizers such as metal soaps, lead compounds and organotin compounds, as well as ultraviolet absorbers, antioxidants, plasticizers, lubricants, and Molded articles of vinyl chloride resin have been made by selectively adding a filler and a colorant, and adding a choking inhibitor such as a metal salt of naphthenic acid, a nickel chelate complex compound, and a metal salt of thiocyanate.

Further, o, o'-shown in JP-A-1-131267 or JP-A-5-287148.
The addition of copper dialkyldithiophosphate or metal salt of dialkyldithiocarbamate has also been carried out to suppress chalking for a longer period of time than conventional ones.

[0006]

However, if an attempt is made to suppress choking, the thermal stability of the vinyl chloride resin will decrease, and thermal decomposition during molding cannot be avoided to some extent.
Therefore, there is a problem that the original effect of the anti-choking agent cannot be exhibited in a molded product, and a product which is sufficiently satisfactory has not yet been provided.

[0007]

As a result of intensive studies to solve the above problems, the present inventor has found that o, o'-dialkyldithiophosphoric acid copper and / or acetic acid diacetate can be added to vinyl chloride resin at a specific composition ratio. It was found that the addition of istin and hydrotalcite provides a vinyl chloride resin composition having better thermal stability than conventional ones and capable of suppressing the chalking of molded articles over a long period of time, and completed the present invention. Came to do.

That is, according to the present invention, the amount of each of o, o'-dialkyldithiophosphate copper and / or stannous acetate, alone or in total, is 0.005 with respect to 100 parts by weight of vinyl chloride resin.
By containing 1 to 1 part by weight and 0.1 to 3 parts by weight of hydrotalcite, a vinyl chloride resin composition having excellent thermal stability at the time of molding and significantly suppressing the whitening phenomenon of the molded article is provided. It is a thing.

The o, o'-dialkyldithiophosphate copper used in the present invention has, for example, 3 carbon atoms as an alkyl group.
Examples thereof include those having 10 to 10 linear or branched alkyl groups, and among them, o, o'-di-n-butyldithiophosphate copper and o, o'-di (2-ethylhexyl) dithiophosphate copper are preferred. .

The hydrotalcite used in the present invention is Mg ₆ Al ₂ (OH) ₁₆ CO ₃ .4H ₂ O or 3MgO.
ZnOAl ₂ O ₃ CO ₃ · H are those represented by ₂ O, both can be used as well.

The vinyl chloride resin which is the object of the present invention is a homo- or copolymer of vinyl chloride and a chlorinated vinyl chloride resin. These resins are mixed with metal soaps, lead compounds, organotin compounds, UV absorbers, UV stabilizers, lubricants, fillers, reinforcing agents, plasticizers, colorants, etc., which are usually added during use. Needless to say, there is no problem.

The amount of copper o, o'-dialkyldithiophosphate and / or stannous acetate used in the present invention, alone or in total, is 0.005 per 100 parts of vinyl chloride resin.
1 to 1 part by weight, preferably 0.05 to 0.5 part by weight, but when the vinyl chloride resin is colored in a bright color,
By reducing the proportion of stannous acetate, bright colors can be retained for a long period of time.

The amount of hydrotalcite used is 0.1 to 3 parts by weight, preferably 0.
It is in the range of 1 to 2 parts by weight. As a method of mixing these into a vinyl chloride resin, o, o'-dialkyldithiophosphoric acid and / or stannous acetate and hydrotalcite may be directly added to and mixed with the vinyl chloride resin,
What was mixed beforehand with other additives, such as a pigment, may be added and mixed with the resin.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is as described above. Therefore, in carrying out the present invention, in 100 parts by weight of a vinyl chloride resin, one of o, o'-dialkyldithiophosphate copper and stannous acetate is used. Either one or both, 0.005 to 1 part by weight, preferably 0.05 to 0.5 part by weight, and 0.1 to 3 parts by weight of hydrotalcite, preferably 0.1 to 2 parts by weight. The resin composition is added, and if necessary, a coloring component for coloring to a desired color and other various additives are added and kneaded by heating to obtain a resin composition for molding, for example.

A so-called masterbatch is prepared in advance by adding the other components of the present invention other than the vinyl chloride resin to the vinyl chloride resin or other suitable carrier resin in a high mixing ratio, and a large proportion of this is prepared. It is also possible to heat and knead with the vinyl chloride resin to produce the desired resin composition.

[0016]

EXAMPLES The present invention will be described more specifically by showing Examples and Comparative Examples below. All parts in the examples are parts by weight.

Examples 1 to 10 Vinyl chloride resin 100 parts, (degree of polymerization 1100) calcium stearate 0.5 parts, zinc stearate 0.5 parts,
0.1 parts of dibutyltin dimalate, o, o 'for 1 part of rouge
-Copper dialkyldithiophosphate and hydrotalcite were blended in the numbers shown in Table 1. This was uniformly dispersed and mixed, and then kneaded with two rolls at 180 ° C. for 3 minutes to give a thickness of 1.
A 5 mm sheet was obtained.

This sheet was placed in an oven at 190 ° C., a thermal stability test was conducted, and the time until blackening was measured. Also, a sheet prepared in the same manner was formed into a 1 mm thick sheet by a hot press at 185 ° C. and exposed outdoors. 12 months exposure,
The color of the test piece after 24 months and 30 months was measured and the degree of choking was measured by ΔY. It should be noted that ΔY uses the Y value (corresponding to the lightness) of XYZ display, and indicates the difference between the Y value of the initial test piece state and the Y value of the test piece after exposure for a predetermined period. The larger the value, the more remarkable the chalking. Table 1 shows the results.

Comparative Examples 1 to 7 Examples 1 to 10 except that dibutyltin dilaurate was used in the number shown in Table 1 instead of hydrotalcite.
A sheet was prepared with the same composition by the same operation as above, a thermal stability test and outdoor exposure were conducted, and the blackening time and ΔY were similarly measured. Table 1 shows the results.

[0020]

[Table 1]

Examples 11 to 20 100 parts vinyl chloride resin, (polymerization degree 1100) 0.5 parts calcium stearate, 0.5 parts zinc stearate,
0.1 part of dibutyltin dimaleate, 1 part of rouge and 0.1 part of carbon black were mixed with stannous acetate, o, o′-dialkyldithiophosphate copper and hydrotalcite in the amounts shown in Table 2. After uniformly dispersing and mixing this,
The mixture was kneaded with two rolls at 0 ° C. for 3 minutes to obtain a sheet having a heat of 1.5 mm.

This sheet was placed in an oven at 190 ° C., a thermal stability test was conducted, and the time until blackening was measured. Also, a sheet prepared in the same manner was formed into a 1 mm thick sheet by a hot press at 185 ° C. and exposed outdoors. 12 months exposure,
After 24 months and 30 months, the color of the test piece was measured and the degree of choking was measured by ΔE. ΔE represents the color difference between the initial test piece state and the test piece after exposure for a predetermined period of time. The larger the value, the more marked the chalking. The results are shown in Table 2.

Comparative Examples 8 to 14 The same formulation as in Examples 11 to 20 except that hydrotalcite or the like was not added and dibutyltin dimaleate was optionally increased to the number shown in Table 2. A sheet was prepared by the above procedure, subjected to outdoor exposure and thermal stability test, and the blackening time and ΔE were similarly measured. The results are shown in Table 2.
Shown in

[0024]

[Table 2]

[0025]

As is apparent from the above points, the present invention has better thermal stability than conventional ones, prevents thermal decomposition during long-time heat molding processing, and has a long-term weather resistance of molded products. It is possible to provide a vinyl chloride resin composition that has excellent properties and can significantly suppress choking of a molded product.

Claims (2)

[Claims] [Claim 1] 100 parts by weight of a vinyl chloride resin,
Vinyl chloride resin composition containing 0.005 to 1 part by weight and 0.1 to 3 parts by weight of hydrotalcite as a total amount of o, o′-copper dialkyldithiophosphate and / or stannous acetate. Stuff. 2. The vinyl chloride resin composition according to claim 1, which contains o, o'-dialkyldithiophosphate copper and / or stannous acetate, hydrotalcite and a coloring component.