There are many colors in the world, and it is these colors that have put together a complex and complex universe. The color itself is full of nature and magic, the crisscross of light and shadow, blossom a glow of the sky wonders, form different color of fruits and vegetables, has shaped people to identify the important basis of distinguish, paste mixed each other, deduce wonderful romantic style, let the life no longer drab and boring. The colors are spliced and blended with each other, becoming an indispensable part of nature.
In the color of the supplement, melt through, hiding the important role of the important role - colorant. Because of the presence of colouring agent, it will belong to the color of nature, extended to every corner of human life. Let beauty no longer be limited to nature, let color penetrate into every aspect of personalized demand.
The color of plastic materials and the pigment or dyes that give the plastic products a beautiful appearance can be called plastic colorants. The production of colorant colored plastic products accounts for more than 80% of the consumption of all plastic products.
Because colorants molecules contain chemical element, chemical structure is different, different kinds of plastic colorants products not only USES, tinting strength, hiding power, coloring, weather resistance, chemical resistance character a persistence or firmly significant differences, toxicity and other main performance, but also for coloring plastics molding, machining process of the thermal stability of oxygen, light, oxygen stability of using process have an impact.
Especially light, oxygen stabilization of colored plastic products, plastic colorants if cooperate with antioxidant and light stabilizer is undeserved, can cause premature coloring plastics fade or change color, but also speed up the light colored plastic products, oxygen aging.
The effect of colorant on the action of oxygen agent
Chrome yellow is an opaque inorganic colorant. It can be used for polyolefin, polystyrene, acrylic resin and other thermoplastic plastic. It has strong shading, good covering, good water resistance and solvent resistance.
But because of the chrome yellow is lead chromate or alkali type of lead chromate with lead sulfate of lead compounds and sulfur antioxidants such as DLTP, DSTP and 1035, 300 share, under the condition of the high temperature of plastic processing can produce chemical reaction, generate black lead sulfide, affect the appearance of the plastic products, also greatly weaken the heat oxygen aging of antioxidant effect. Therefore, chrome-containing colorants can't be Shared with the sulfur-containing antioxidant.
In addition, polypropylene molecular chain contains tertiary carbon atoms which are easily decomposed by oxygen and must be protected against aging by using antioxidants during processing, storage and application. In colouring polypropylene, certain colorants can react with low-molecular-blocked phenolic antioxidants and weaken the antioxygenation agent. The effects of some colorants on the anti-oxidants of polypropylene and low molecular phenols (table) can be divided into three categories:
Table 1
The effect of table 1 colorant (15%) on the thermal oxygen stability of polypropylene with phenolic antioxidant polypropylene was studied
Serious effects: fluted black, single azo red 3B, quinacridone, phthalocyanine blue, iron oxide yellow brown;
Secondary effects: phthalocyanine green, furnace carbon black, group green, oxidized chromium green;
Slight influence: cadmium yellow, mercury cadmium red, rutile type titanium dioxide.
When the pearlite powder is used in some resins with the BHT of monophenol antioxidant, it will cause the white products to turn yellow and cause the product quality problems.
The influence of two colorants on the effect of light stabilizer
The effect of colorant on the effect of light stabilizer on colored plastic products has two main effects
One is that the colouring agent contains copper, manganese, nickel and other heavy metal elements or impurities, which have light activity, photosensitivity, catalyze and accelerate the photoaging speed of plastic materials. Phthalocyanine, which contains free copper and impurities, promotes the aging of polypropylene; Iron oxide can reduce the efficiency of benzene and triazole, diphenylketone and organic nickel salt in polypropylene by over 20%. For polyethylene, titanium dioxide, group green, chromium oxide green, cobalt green, iron red and other colorant use, will aggravate the light aging.
Second, some molecular structure of the colorant can interact with the light stabilizer directly to weaken the efficacy of the light stabilizer. The acid colorant can disable the obstructed amine light stabilizer; In polypropylene, azo red and yellow can be used as the stabilizer of the inhibitor, and the combination of azo condensation red BR and azo condensation yellow 3G can reduce the action of the inhibitor by 25% and 50% respectively.
Table 2.
Table 2 effects of different colorants on the photostability of high pressure polyethylene (uv-328) high pressure polyethylene.
It can be seen that orange chrome yellow significantly improves the light stability of high pressure polyethylene, and the phthalocyanine green and group blue have slightly improved or not much influence, while cadmium yellow reduces the light stability of high pressure polyethylene.
F.S teinlin and baron ear in different colorants (1%), 1010 (0.1%), antioxidants, light stabilizer 770 (0.5%) and polypropylene spinning under 285 ℃, and the tensile 4 times, for 80 points / 24 root fiber. This fiber is tested by xenon lamp
Effects of different colorants on the light stability of hvpe films containing benzotriazole:
When the intensity drops by 50%, the amount of radiation exposed to the sample is compared. The results showed that the polypropylene fiber, which was colored by organic pigment yellow, red and orange, was added to the antioxygenation and photostabilizer, but its stability was lower than that of uncolored polypropylene fiber.
Conclusion: light, oxygen stabilization of colored plastic products, plastic colorants if cooperate with antioxidant and light stabilizer is undeserved, can cause premature coloring plastics fade or change color, but also speed up the light colored plastic products, oxygen aging how to correctly use additives, is very important to the stability of plastic products. Therefore, in the process of plastic modification, it is very important to understand and grasp the structure and properties of auxiliaries.
Colorants make our life colorful
With regard to the coloring matter, today, we will introduce it to you, and hope to share it with you next time!
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