Color rubber products with the introduction of the use of rubber colorants!
Pictures of rubber products made of black, gray or white accounted for the majority of these are achromatic color. The choice of raw materials for such products is relatively simple.
Specifically, carbon black is the main colorant for black rubber products. Titanium dioxide is the main whitening agent for white products. Zinc oxide, barite and black iron dioxide can be used to mix with other colors to form special shades.
Add coloring agent on the role of rubber products:
1, improve the value of goods beautification effect: we live in the colorful personalized modern society, the more the pursuit of the enjoyment of beauty, rubber products is the same. Especially household goods, such as rubber vulcanized shoes, food utensils, toys. Rubber gloves, balloons, all kinds of rubber accessories, all from the industrial design point of view, the first impression of the product appearance of color, to enhance the value of goods, to create a sense of beauty and art of the product.
2, classification marking and warning role: rubber products, especially installed in the equipment inside the important position, such as seals accessories, dust cover, diaphragm, O-ring, etc., as well as composite hose layer, special special pads, the need for a different color marking, easy to differentiate and maintenance. Some of the rubber material wrapped around the cable and wire, in line with the Menzel color scale ten color spectrum for color identification, to provide professional wiring and maintenance of the warning.
3, improve the light resistance and weather resistance of rubber products: rubber products need to have a certain service life, in order to reflect the value. Especially in outdoor working conditions, to withstand light, rain, and the atmosphere of acid and alkali pollution particles test. Such as in the formula design to consider adding certain light and weathering resistant compounds in the rubber material. Such as colorant carbon black, you can receive efficient, inexpensive light shielding effect. So far, there is no such thing as an ultraviolet light absorber, with coloring agent carbon black as strong as the effect of light stabilization.
4, enhance the conductivity of rubber. As we all know, non-polar rubber conductivity is very poor, it can be said that insulation is its characteristics, even if the polar rubber, its conductivity can not meet the different conductive demand, and add both conductive function of the colorant carbon black, such as acetylene carbon black, can make up for the lack of rubber conductivity.
5, the heat resistance of some colorants. Some inorganic colorants added to rubber, but also to enhance the heat-resistant function of the product, such as iron oxide red powder, rutile titanium dioxide, chromium oxide pigment, cadmium red, cadmium orange, etc. commonly used as a heat-resistant with the agent, added to the rubber.
Selection of colorants
The selection of colorants not only depends on the processing requirements mentioned above, but also depends on the final use of the products. The following characteristics must be taken into account when using them: resistance to color fading (caused by sunlight, heat, or weathering), resistance to color bleeding, and harmful to the aging characteristics of the basic rubber (avoid colorants containing copper or manganese).
In addition, costs must be accounted for and the most economical colorants carefully selected to meet the production needs of colored rubber products.
Available colorants have two groups: inorganic colorants and organic colorants.
First, inorganic colorants
Usually used inorganic colorants are iron oxide, lead colorants (such as chrome yellow), ultramarine, chromium oxide and cadmium colorants.
Iron oxide can be red, yellow, brown or tan. All of these shades are relatively dull and all are supplied in a fairly fine, dense powder form. Synthetic iron oxide colorants are recommended. Particular care must be taken in the selection of iron oxides as some contain impurities (e.g. copper) which can cause degradation of the rubber product as it ages.
Ultramarine colorants are capable of providing shades ranging from greenish tones to reddish blues. These colorants have excellent thermal and light stability, but their poor acid resistance limits them to many outdoor applications and any indoor use where there is a risk of contact with acids such as fruit juices. The greatest use of Ultramarine in rubber is for white rubber, as is indigo for washing shirts. Saturated, vibrant colors can be obtained with Ultramarine.
Chromium oxide green provides a blue-green hue, a color with excellent heat and light resistance and high relative density.
Lead colorants include chrome yellow colorants and molybdenum orange colorants, which have a wide range of hues. Brilliant colors with good heat and light resistance can be obtained with these colorants, but they are lead-containing compounds whose dust is capable of glowing and burning. In sulfur vulcanized rubbers, any moisture may cause lead sulfide spots. These colorants have now been replaced by organic colorants on most occasions.
Cadmium colorants are used only in special applications where colorfastness is required. This colorant is usually added in a basic form to improve its dispersion and processing. It is relatively dense and expensive. Cadmium is still a heavy metal, and rubber compounds should be avoided with as much care as possible.
All inorganic colorants are weak colorants and their normal dosage is 2% of the total mass of the rubber compound
