Problems to be Noticed in the Design of Colouring Formula for Rubber Products

Problems to be Noticed in the Design of Colouring Formula for Rubber Products

Colouring of rubber products is a process technology combining theory with practice. It needs not only the basic principle of coloring technology, but also the process and skills of rubber products processing and moulding. Experience is very strong, color matching personnel themselves should constantly exercise and learn, have good color resolution, to fully grasp the compatibility and dispersion of different rubber products, colors and various additives and coloring pigments, to be familiar with the amount of coloring pigments added in the rubber, and to fully understand the rubber products. Domestic and foreign laws and regulations on environmental protection requirements of pigments. Such as heavy metal content, polycyclic aromatic hydrocarbon content, etc.

At present, most of the small and medium-sized rubber products enterprises still use empirical visual method for color matching. This is an experiential trial-and-error method, which is not very scientific, but simple and practical. It just takes a lot of time. For example, when formulating and designing the coloring formula for rubber products, we should collect as much as possible a large number of samples of colored rubber products, find out samples with similar colors as required as reference materials, observe carefully, analyze the similarities and differences in color, gloss and other aspects between reference materials and given standard colors, and base on the formulation of reference materials. Basically, according to the actual needs, the dosage of various colorants should be adjusted accordingly. So it takes time to do it. With the development of science and the progress of the times, the application of color matching machine has gradually become popular. The function of human eyes and brain is replaced by spectrophotometer and other measuring instruments. The trial-and-error process of shading ratio is carried out by computer simulation, instead of mixing rubber products with shading. Operators only need to measure the reflectivity, i.e. its standard value and select the shading agent for shading. By adjusting the concentration of shading agent, the conversion value between the measuring system and the standard value can be obtained. Agreement. If the colorant chosen by the operator is reasonable, the system will output a formula in the form of mass fraction, and then convert the percentage formula into mass ratio. By means of computer, the time of the whole formulation process of colored rubber products can be shortened within ten minutes.

In the process of colour matching of rubber products, the simpler the selection of colouring pigments, the better the choice of colouring pigments, the less tri-colouring can be used, because the more kinds of pigments are added, the more "complementary colours" will be caused. On the contrary, the colouring agent used in latex products, such as coloured balloons and household gloves, should be avoided as far as possible. Colour, lest lose bright brightness. At the same time, attention should be paid to the selection of pigments with similar heat resistance in order to avoid the color change caused by the temperature change during vulcanization because of the great difference in heat stability. The colouring agent used in latex should also consider the alkali resistance and dispersion of colour.

Colour matching of rubber products is an indispensable link in the production of rubber products. It is technically and experientially strong and needs long-term practice and accumulation. It is better to establish a database of color plate samples, and to classify the samples of various pigments, colorants and colored compounds used and the colored compounds being used in production. Record and keep for reference so as to reduce the chromatic aberration of different batches of colored compound with the same formulation as far as possible. Despite the complexity of color matching technology for rubber products, as long as we have a serious and rigorous working attitude, and learn more about the performance of various pigments, dosage, compatibility and dispersion with rubber products, as well as environmental protection and safety, and do more experiments, we will fully grasp the technology of color matching for rubber products.