JPS58171452A - Colorant for thermoplastic resin - Google Patents

Abstract

PURPOSE:To prepare the titled colorant having excellent dispersibility in resins, and giving a colored product free from mottling, by adding an amide wax of hydroxystearic acid as a dispersing agent to a dye or pigment. CONSTITUTION:The objective colorant is prepared, e.g. by adding preferably 20-200pts.wt. of an amide wax of hydroxystearic acid (e.g., hydroxystearic acid monoamide, hydroxystearic acid methylenebisamide, etc.) as a dispersing agent to 100pts.wt. of a dye or pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to colorants for thermoplastic resins, and uses amide wax of droxystearic acid as a dispersion aid for dyes and pigments to produce thermoplastic resins with excellent particle dispersibility. colorants for use in the market. Conventionally, metal salts of stearic acid, such as calcium stearate, magnesium stearate, and zinc stearate's newly prepared metal soaps of stearic acid, have been used as dispersion aids for dyes and pigments used as colorants for thermoplastic resins. is publicly known.

However, the above-mentioned metal soap has limited compatibility with thermoplastic resins, so resin selectivity is poor, and when used in large quantities with resins with poor compatibility, slipping during molding and separation from the resin may occur. However, the effects of peeling and reducing the mechanical strength of the resin were also satisfactory and effective.

Furthermore, in the case of polyolefin wax, although it is sufficiently compatible with polyolefin resins such as polystyrene and polypropylene, ethylene-vinyl acetate copolymer resins, and butyl rubber resins, it is compatible with styrene resins such as polystyrene and Al1, and polymethyl methacrylate. When used in large quantities for resins and polycarbonate resins, cloudiness, separation,
Peeling and deterioration of physical properties occurred, and when dyes and pigments were used as colorants, the color unevenness performance was also unsatisfactory, and there was a defect that the trunk circumference of the resin suitable for use in 5 was narrow.

Therefore, in order to improve the color unevenness caused by poor particle dispersion or poor diffusivity of the conventional colorants mentioned above, the present inventor conducted various research on pigment dispersion aids, and found that amide wax of hydroxystearic acid The present invention was achieved based on the findings that the method is extremely effective in improving the particle dispersibility of pigments and can be used in Kokakuho resins.

That is, the present invention relates to a coloring agent for thermoplastic resins characterized by adding hydroxystearic acid amide wax to dyes and pigments.

Examples of the thermoplastic resin in the present invention include synthetic resins such as polyethylene, polypropylene, polybutene-1, polystyrene, polyvinyl chloride, polycarbonate, polymethyl methacrylate, AlB, Mu8, and ZVmu.

The dyes and pigments used as the main components of the colorant in the present invention are dyes and pigments conventionally used in the technical field, and specifically include azo, phthalocyanine, quinacridone, isoindolinone, and thioindigo dyes. organic dyes and pigments, titanium oxide,
Examples include inorganic pigments such as cobalt blue, red iron and yellow lead, and carbon black.

In addition, 72 of the hydroxystearic acid used in the present invention
Examples of the doxes include hydroxystearic acid monoamide, hydroxystearic acid bisamide, hydroxystearic acid methylene bisamide, and hydroxystearic acid ethylene bisamide.

One or more of the hydroxystearic acid amide waxes may be used in combination.

The amount of hydroxystearic acid amide wax added to the dye/pigment is 5 to 900 parts by weight per 100 parts by weight of the dye/pigment.
Preferably it is 20-400 parts by weight.

In addition, in the present invention, a dispersant such as a conventionally known fatty acid metal soap or polyolefin wax may be used in combination with the amide wax of drooxystearic acid.

It is also possible to mix hydroxystepric acid amide wax and dye and pigment in a thermoplastic resin at a high concentration to form a masterbatch, and use this masterbatch by mixing it with a natural thermoplastic resin.

Hereinafter, the present invention will be concretely established through Examples.

In addition, in Examples and Comparative Examples, part refers to si part.

Example 1 40 parts of rutile titanium fluoride, 2 parts of copper phthalocyanine blue
0 parts and 40 parts of hydroxystearic acid bisacide were heated to 160 to 170°C and charged into a nine double-arm kneader,
After mixing for 10 minutes at a rotational speed of 6 Or-, the mixed material is shaken out in the form of blocks while cooling the kneader with water. Next, the mixed wire material was sufficiently cooled, crushed, and then crushed in a microsample mill (pulverizer manufactured by Hosokawa Iron Works Co., Ltd.) to obtain granular colorant 1 having a particle size of 16 to 60 mesh.

Next, the above-mentioned granular colorant was blended with various thermoplastic resins as shown in Table 1, and a 7-ounce in-line screw injection molding machine (cylinder temperature 230°C, screw rotation speed 7 Q rpa+ At a back pressure of 10/i), using a mold with a direct gate, vertically 200 wg
Colored molded plates made of various thermoplastic resins were obtained, measuring 1I, 150mm wide, and 3m thick.

A small piece was cut from the gate part and weld part of each colored molded plate, and it was heat pressed to make a film of 100 mm length and width and about 0.5 fi thickness, and the color unevenness of the surface and transmission of the film was made. Visual observation of the condition showed that as shown in Table 1, none of the thermoplastic resin films exhibited any unevenness due to insufficient mixing of the colorant, and an extremely uniform colored condition was observed.

In addition, a small piece was cut from each colored molded rice, a film with a thickness of about 50p was created by heat pressing, and the coarse particles were observed using an optical microscope with a magnification of 150 times. As shown in the 1st floor,
Not even 1.1 aggregated particles F of 20p or more were observed in one field of view, indicating extremely excellent particle dispersibility.

Table 1 Comparative Example 1 Lua fJ, fl 40 parts of titanium oxide, 20 parts of Taku Phthalocyanine Blue and 4 parts of low molecular weight polyethylene wax
A granular coloring agent having a particle size of 16 to 6 o mesh was obtained by adding 0 part in the same manner as in Example 1.

Next, as shown in Table 2, the color unevenness and particle dispersibility of the granular colorant in various thermoplastic resins were observed in the same manner as in Example 1.

As a result, although high-density polyethylene shown in Table 2 exhibited good performance, satisfactory performance was not obtained for polypropylene, polystyrene, and Mu-B8, and the resin's versatility was compromised.

Table 2 Perylene pigment (trade name: Pv Fast Red B) S
ell,! : Hydroxystearic acid ethylene bisamide 50 was put into a double-arm kneader heated to 160 to 170°C, mixed for 10 minutes at 60 rpm, and while the kneader was cooled with water, the mixed gauze was taken out in the form of a block and immediately taken out. The mixture was supplied to a twin-screw granulator (product name: Beretter Fuji Paudal Co., Ltd.) for heating and granulation to obtain a granular colorant having a diameter of about 1 liter and a length of about 3 tll.

Next, as shown in Table 3, the above granular colorant was compounded in combination with various thermoplastic resins, and a 7-ounce in-line screw injection molding machine (cylinder temperature 230-28
0°C, screw rotation speed 70 vpm back pressure 10/-)
Using a mold with a direct gate, vertical 20G
Colored molded plates made of various thermoplastic resins having a length of 50 wII% and a thickness of 3 gourd were obtained.

A small piece was cut from the gate and weld part of each colored molded plate, and a film of 100w x 0.5cm thick was created by heat pressing, and the color unevenness on the surface and transmission of the film was visually observed. As shown in Table 3, none of the thermoplastic resin films exhibited color unevenness due to lack of mixing of the coloring agent and exhibited an extremely uniform colored state.

In addition, a small piece was cut from each colored molded plate, a film with a thickness of approximately 50 mm was made by heat pressing, and the coarse particles were observed under an optical microscope at a magnification of 150 times. As shown in Table 3,
Not a single aggregated particle of 20 parts or more was observed in the visual field, indicating extremely excellent particle dispersibility.

Table 3 Comparative Example 2 50 parts of perylene pigment (trade name: Pv Fast Red product from Hoechst) and 5 parts of ethylene bisamide stearate
Part 0 was prepared in the same manner as in Example 2, with a diameter of about 1fi and a length of about 31mm.
111 granular colorants were obtained.

Next, as shown in Table 4, the color unevenness and particle dispersibility of the granular colorant in various thermoplastic resins were observed in the same manner as Example 2.

As shown in Table 4, although polypropylene exhibited somewhat good performance, AB8 resin and polycarbonate resin did not provide satisfactory performance, resulting in poor resin versatility.

Table 4 Patent applicant: Dainichiseika Industrial Co., Ltd.

Claims (1)

[Claims] A coloring agent for thermoplastic resins characterized by adding hydroxystearic acid amide wax to dyes and pigments.