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Plastic optical brightener has what kind of property

Original:www.qtzbj.comAuthor:山东齐泰荧光增白Editor:admin Read: Publish time:2019-03-18 22:15【Big Mid Small
plastic with fluorescent whitening agent should have the property of fluorescent whitening agent is a kind of fluorescent dye, also some information called it a white dye or colorless dye, there are other information according to its in plastic mainly used to change the appearance of the characteristics of this feature, called the plastic coloring special pigment. There are two main types of commercially available optical brighteners: one is similar to common water-soluble dyes and is widely used in textiles; Another kind of insoluble in water, but soluble in organic solvents, this kind of fluorescent whitening agent is suitable for plastic. But to be used for plastic whitening, according to the performance of plastic, processing characteristics and special requirements for use, the selected fluorescent whitening agent should also have the following properties:
(1) whitening effect is better. High whiteness is the main embodiment of the whitening effect of fluorescent whitening agent, the advantages of high whiteness is not only reflected in the appearance of plastic, but also will produce a lot of advantages, such as high whiteness can reduce the amount of use, thus can prevent the change of plastic strength, but also reduce the cost.
(2) high temperature stability. Because the melting temperature of the plastic products of plasticizing shape is general need in the high temperature of 150 ~ 280 ℃, so the requirement of fluorescent whitening agent does not decompose in the temperature range, color changing and losing whitening effect.
(3) high sublimation fastness and sun fastness to climate. Because in recent years in the building materials and advertising industry a large number of white plastic, which requires the use of optical brightener with excellent heat sublimation and resistance to sunlight and other climatic conditions of the performance. The climate fastness of fluorescent whitening agent is affected by the structure of fluorescent whitening agent and is related to the amount of fluorescent whitening agent.
(4) it has good compatibility with plastics and good dispersion in it. This is necessary to ensure that the plastic is uniformly whitened. The molecular dispersion or total solubility of fluorescent whitening agents is very important to achieve high efficiency optical whitening. If use optical brightener to dye white goods, first put optical brightener into the resin carrier for concentration, this concentration is usually called masterbatch or masterbatch, and then use masterbatch to color a large number of polymers, its dispersion and optical effect are much better than the resin directly added with optical brightener. Another example is the very low concentration of water insoluble fluorescent whitening agents dispersed in water, they will show good optical effect in nylon and polyester fiber; Adding the optical brightener directly to the melt of the polymer prepared for drawing showed no optical effect. This is because water is dispersed for absorption, which dissolves the fluorescent whitening agent in the form of molecules in the polymer matrix, while the fluorescent whitening agent mixed into the polymer melt body can only be dispersed in the form of aggregates in the melt body at most. For the poor dispersion in plastics such as optical brightener colorant, in order to better dispersion, it is generally necessary to carry out secondary processing, that is, in the colorant to add a certain amount of processing agent or dispersant, so that it has a good dispersion of colorant. In addition to improving the dispersibility of the optical brightener, the choice of treatment or dispersing agent should not cause the degradation of the physical properties of the plastics.
(5) good solvent resistance, migration resistance and chemical stability, no exudation and extraction. In contact with solvents or products containing plasticizers, they will not migrate due to dissolution. Good acid and alkaline resistance, and other additives in plastic do not occur harmful chemical reactions.
(6) it has no influence on the processing (such as fluidity, lubricity, printing and finishing) of plastics and their performance (such as electrical performance, physical and mechanical performance, aging resistance, etc.).
(7) it shall be resistant to chemicals and electrically insulating.
(8) should be non-toxic, tasteless. This requirement for the food industry, the toy industry for fluorescent whitening agent is particularly important, it is related to people's health and life safety. In some countries, there are strict regulations on optical brighteners used in the food and toy industries.
Above a few points are to plastic use optical brightener more comprehensive requirement, have the breed with all these requirements commonly very few, when using so, should wait for specific circumstance to choose according to the purpose that USES, environment element.


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