DE2418066C2 - Process for the production of color pastes or dispersions - Google Patents

Description

description

It is well known that the manufacturers of plastic granulates do not take into account the many different coloring requirements the processor. Therefore the granules have to be colored afterwards. This has recently been used Paints in paste form, since with paint pastes a better distribution of the color substances in the spray and compacts is achieved than with pure pigments, so-called dry colors. Incidentally, you can use Color pastes, which generally have a viscosity of 300-35,000 centipoise, colored granules Process more dust-free, they produce a more speck-free coloring, enable better mixing with plastic powders or granulates in a shorter time and even improve the flow properties of plastics.

The addition of surfactants has long been known in the production of aqueous paint dispersions. According to British Patent 8 44 751, organic pigments are mixed with nonionic pigments in a kneader surfactants, e.g. B. also laurates, added to these pigments to inks for pens to process. The French patent 14 37 074 discloses the production of pulverulent pigments from a moist raw material containing aluminum. For this process, small amounts of the raw material are added Sorbitan monooleates and trioleates added to the finished pigment with extremely low moisture content remain. Color pastes for coloring plastics of all kinds are made according to this process not made.

The known color pastes, however, have one because of the binder chosen for their production Number of disadvantages. Often they do not dry up enough on the granules, which means that automatic conveying is possible the silo storage of the granules becomes difficult. Many color pastes settle in the Containers so strongly that they have to be stirred up again for a long time before use. Other Color pastes are not suitable for all known plastics and are sticky so that mixed with them Granules lose their flowability. In addition, the mixing units used, which were needed to color plastics, cause heavy soiling.

The binder used according to the invention results in color pastes in which these disadvantages do not occur, in particular the color pastes produced therewith dry on the granules without any problems, so that the granules colored in this way are unrestrictedly suitable for automatic conveying and storage in silos.
It has now been found that color pastes or dispersions for coloring plastic granules by dispersing inorganic or organic dry colors in a nonionic surfactant with the above-mentioned improved properties are obtained by using the dry colors in a mixture of 95-40 wt. % of a sorbitan and / or sorbitol surfactant and 5 to 60% by weight of a powdery inert solid dispersed

Color pastes or dispersions with binders of such a composition are compatible with practical all types of plastics, always result in stain-free and streak-free colors and behave absolutely trouble-free when entering data into machines such as injection molds and extrusion presses.

All pulverulent inert solids come as solids for the binders used according to the invention in question, such as B. silica and sulfates, carbonates and silicates of alkaline earths, in particular those of magnesium, calcium, strontium, and barium; Calcium carbonate is particularly preferred.

Particularly effective surfactants come, for. B. the following connections into consideration:

Sorbitan fatty acid esters such as sorbitan monolaurate, monoleate, trioleate, sesquioleate, palmitate, monostearate, Tristearate and mixtures thereof.

In addition to these esters, there are long-chain polyoxyethylene-substituted ones Sorbitan esters in question, such as. B. polyoxyethylene (n) sorbitan monoleate, monolaurate, -Monostearate, -Monopalmitate, -Trioleate, -Tristearate and Sesquioleate, the length of the polyoxyethylene chains (n) is between 4 and 40.

Of the not quite as effective, sorbitol-containing surfactants come, for. B. Consider the following:
Polyoxyethylene sorbitol oleate laurate, polyoxyethylene sorbitol hexaoleate, polyoxyethylene sorbitol oleate laurate, polyoxyethylene sorbitol lanolin derivative, polyoxyethylene sorbitol, polyoxyethylene sorbitol laurate, polyoxyethylene sorbitol propylene oleate.

The aforementioned sorbitan and sorbitol surfactants can - z. B. for cost-saving reasons - up to 50% by other known ionic and / or non-ionic substances that do not contain sorbitan or sorbitol Surfactants are added without the beneficial effect of the binder is impaired, such. B. polyoxyethylene fatty acid esters and ethers of saturated and / or unsaturated fatty acids, with the alcohol component for the formation of esters and ethers z. B. lauryl alcohol, cetyl alcohol, allyl alcohol, terpineol, sorbitol and mannitol is used. Suitable are e.g. B. the polyoxyethylene lauryl, Cetyl, stearyl, tridecyl and / or nonylphenyl ethers or z. B. Polyoxyethylene stearates, palmitates and / or laurates.

Furthermore, an improvement in the binding capacity of the agent used according to the invention is achieved by replacing 80% by weight of the surfactants with a plasticizer and / or a lubricant. as Plasticizers come e.g. B. in question:

2-dioctyl acetate, 2-dioctyl adipate, di-2-ethylene hexyl adipate, Trioctyl phosphate, tricresyl phosphate, dimethyl phthalate; high-boiling alcohols as lubricants, e.g. B. Glycols and especially the esters of long-chain saturated and unsaturated fatty acids with about Ci 2 to C23, wherein as alcohol components z. B. Lauryl alcohol, Ce

i 24 18 066 4th Wt% in j Ethyl alcohol, allyl alcohol and terpineol, manite and vinyl 2. binder alcohol come into fra. The binders used according to the invention read Wt% in must mix with 8-70% by weight of dyes. Color paste 24.2 whereby color pastes or dispersions are formed 5 40.4 those that work well with plastic powders or soot 8.0 I. -granules, e.g. B. thermoplastic resins made from styrene, Sorbitan trioleate 22.3 27.9 Styrene-acrylonitrile, styrene-butadiene, acrylonitrile-buta- Polyoxyethylene (4) - 37.4 7.6 diene styrofoam, olefin, vinyl and urethane compounds, YY Y \ I
Sorbitan monolaurate 100.0% tolerate. When mixing the binders with the 10 Dioctyl acetate 25.5 Dyes can be other well-known agents, such as flatulence Calcium carbonate 7.0 medium, antioxidants, deviating agents (bulking agents), 100.0% Opacifiers and agents for stabilizing against Ul Wt% in ultraviolet radiation can be added. 3. binder With the aid of the bin 15 used according to the invention the color pastes and dispersions produced by means of Wt.% In to the plastics to be colored in general Color paste 9.2 Amounts from 1-2% up to about 15% based on the 42.5 Weight of plastic, added The additional amount is im TiO ₃ 59.9 generally depending on the desired color ink 20 Sorbitan monoleate 3.7 25.4 sity Usually, the color pastes are in the usual Polyoxyethylene (20) 17.0 22.9 chen mixing units mixed with the resin or on Sorbitan monolaurate 100.0% lower end of the feed funnel or at the beginning of the Fatty acid cetyl ester 10.2 Screw fed to the extruder CaCO ₃ 9.2 The color pastes produced according to the invention or 25 100.0% dispersions have a high stability even with ver Wt% in relatively high temperatures. Even by length 4th binder When they are stored, they do not clump together gen. They are practically made with all known synthetic resins Wt.% In well tolerated. Your fluidity can easily be measured in 30 Color paste 8.5 set in the manner desired for processing, 22.9 in particular through the quantitative coordination of the Yellow pigment 17.6 Solids content. Sorbitan trioleate 7.0 13.5 Examples of binders embodying the present invention Polyoxyethylene (20) 18.9 55.1 explain in more detail, have the following 35 Sorbitol hexaoleate 100.0% Settlement: Dioctyl adipate 11.1 Mixtures of Calcium carbonate 45.4 70 parts of sorbitan trioleate and 30 parts of calcium
carbonate; from 100.0% Wt% in 20 parts of sorbitan monoleate, 50 parts of a fat 40 5. binder acid ester with a viscosity of 28 Cp at 2O ⁰ C and 30 parts of calcium carbonate; from Wt.% In _ 20 parts of sorbitan trioleate, 30 parts of a poly Color paste 739 oxyethylene lauryl ether, 20 parts of a polyoxy 18.8 ethylene nonylphenyl ether and 30 parts of calcium 45 TiO ₂ 67.0 7.3 umcarbonate. Sorbitan monoleate 24.4 100.0% Further examples of color pastes and binders: Dioctyl adipate 6.2 CaCO ₃ 2.4 1. 100.0% Wt% in % By weight in% by weight in 6th binder Color paste binder Wt% in TiO ₂ 70.0 - Color paste 30.6 Polyoxyethylene 8.8 29.3 55 56.9 Sorbitol oleate Ultramarine blue 20.0 12.5 Fatty acid allyl esters 8.1 27.0 Sorbitan monolaurate 24.5 100.0% Dioctyl acetate 8.1 27.0 Fatty acid lauryl ester 45.5 Calcium carbonate 5.0 16.7 BaSO ₄ 10.0 100.0% 100.0% 60
65 100.0%

7th

% By weight in color paste

% By weight in binder

TlO ₂ 60 Sorbitan trioleate 7th 17.5 Polyoxyethylene (20) 15th 37.5 Sorbitan trioleate Dimethyl phthalate 8th 20.0 Silica 10 25.0

100.0%

10

100.0%

15th

% By weight in color paste

% By weight in binder

TiO ₂

Sorbitan trioleate Polyoxyethylene (20) Sorbitan trioleate Tricresyl phosphate

MgSiO ₂

65.0

5.7

15.3

9.0

5.0

100.0%

9.

163
43.7

25.7

14.3

100.0%

20th

25th

% By weight in color paste

Weight o / o in Binder 30

TiO ₂

Sorbitan trioleate Polyoxyethylene (20) Sorbitan trioleate Tricresyl phosphate

SiO ₂

65.0

5.7

15.3

9.0

5.0

100.0%

163 43.7

25.7

14.3

100.0%

35

40

45

50

55

60

65

Claims (3)

Claims 1. A process for the production of color pastes or dispersions for coloring plastic granules by dispersing inorganic or organic dry colors in a nonionic surfactant, characterized in that the dry colors are in a mixture of 95-40% by weight of a sorbitan and / or Sorbitol surfactant and 5 to 60% by weight of a powdery inert solid dispersed 2. The method according to claim 1, characterized in that that the surfactants are replaced by other known surfactants in amounts of up to 50% by weight will. 3. Process according to claims 1 and 2, characterized in that the surfactants in amounts up to 80% by weight can be replaced by plasticizers and / or lubricants.