Mechanism of action and uses of zinc borate Mechanism of action【1】
Zinc borate has a long history of being used as a sterilizer and preservative, and it has fire-retardant properties for wood. Zinc borate is toxic to cells and is also an inhibitor of enzymes. It inhibits the growth of fungi because the activity of enzymes in the bacteria is blocked. It has a wide range of effects on organisms that damage wood fibers, such as fungi such as white rot fungi and brown rot fungi, as well as termites. Insects On Plate.
The mechanism of action and uses of zinc borate. Product features[1]
Zinc borate is an inorganic wood preservative, which is mainly used in wood/polyolefin and wood/PVC composite materials. Similar products have been registered in my country, including disodium octaborate tetrahydrate. The two products have the same mechanism of action, except that disodium octaborate tetrahydrate has good water solubility and wood is usually treated by soaking, while zinc borate is insoluble in water. , can only be added in solid form to board or polymer board, these two products are used to treat different woods. It has been registered in the United States, Canada and other countries. Prevention and control of decay fungi and termites on g boards.
The mechanism of action and use toxicity of zinc borate【1】
The acute toxicity of the original drug is low, with an oral LD5 in rats. >5 000mg/kg, transdermal LDs. >5 000mg/kg, inhalation I￡. >4 950mg/m3, non-irritating to eyes and skin, non-allergenic. Ames test, in vitro mammalian cell chromosome aberration test, in vitro mammalian cell gene mutation test, bone marrow cell chromosome aberration test, and in vivo mammalian cell UDS test were all negative.
Because it is decomposed in the body to produce borate and zinc ions, its toxicity is mainly related to boric acid and zinc oxide. Subchronic toxicity uses boric acid and zinc oxide as test materials. After 90 days of continuous oral feeding, the maximum no-effect dose of boric acid in rats was 71 mg/kg for males and 98 mg/kg for females; the maximum no-effect dose for zinc oxide rats was 3 000 mg/kg.
Mechanism of action and uses of zinc borate Environmental behavior【1】
Due to the strong binding force of the B-0 bond in the zinc borate structure, the crystal formed is very stable and difficult to degrade. Stable in water under neutral conditions. It is easier to decompose in acidic and alkaline environments.
The preparation is low-toxic to fleas, birds and earthworms, low-toxic to bluegill sunfish, and moderately toxic to rainbow trout. Due to the special way this product is used, the possibility of entering the environment during normal use is low, and the risk to non-target organisms is low.
The mechanism and uses of zinc borate production enterprises【1】
The manufacturer is American Borax Group. The registration certificate number of 98.8% zinc borate powder is WL20090082, and the registration certificate number of 98.8% zinc borate technical material is WL20090083.
The mechanism of action and uses of zinc borate. Product uses【2】
Used as trace element fertilizer in agriculture. Also used as a nutrient solution additive for soilless cultivation.
Zinc borate is widely used in polymer materials. In the chemical, steel, coal and other industries, it is mainly used to make various flame-resistant tapes (tubes), flame-resistant cables, etc. This product is a cheap flame retardant that can be used as a substitute for antimony white. It has good flame retardancy for halogenated polymers. It can completely replace antimony trioxide (antimony white) in unsaturated polyester and can be used in soft polyesters. Vinyl chloride resin can partially replace antimony trioxide to reduce costs. Suitable for high temperature processing needs. It also has good synergistic effects when used together with halogen-containing flame retardants. This product is suitable for flame retardancy of unsaturated polyester, polyvinyl chloride, epoxy resin, polyolefin, polycarbonate, polyurethane, ABS resin and other plastics. It is also suitable as a flame retardant additive for fiber fabrics and wood coatings. In addition, it is also used in medicine, fungicides, and ceramic glazes. At the same time, zinc borate is a good non-toxic anti-rust pigment.
The mechanism of action and usage performance of zinc borate【3】
There are dozens of zinc borate manufacturers in my country. Currently, there are more than ten manufacturers including Shanghai Jinghua Chemical Plant, Zhenjiang Sulfuric Acid Plant, and Liaoning Gaizhou Inorganic Chemical Plant. Table 6-63 is the technical specifications of zinc borate produced by Liaoning Gaizhou Inorganic Chemical Factory. Table 6.63 Main technical indicators of zinc borate
The American Borax Company is a professional manufacturer of zinc borate. It currently provides 4 brands of flame retardants. Firebrake ZB is a standard flame retardant grade zinc borate, Firebrake ZB-XF is ultra-fine powder, and Firebrake 415 is Borax’s latest product in recent years. A kind of zinc borate with high dehydration temperature is developed, which is especially suitable for processing engineering plastics with high molding temperature, such as polyether, polysulfone, and polyimide. Its flame retardant effect is similar to that of standard zinc borate, but its smoke suppression performance is far lower than that of standard zinc borate. superior. In the soft PVC cable covering material, Firebrake 415 is used instead of Firebrake ZB, and the maximum specific optical density of the material is reduced by 100 to 130. Table 6-64 shows the main performance of Firebrake ZB and Firebrake 415.
The action mechanism and uses of zinc borate【3】
Zinc borate is an effective fire retardant. In unsaturated polyester, rigid PVC, epoxy compounds, polyphenylene ether and other systems, zinc borate alone can achieve a flame retardant effect. In some other systems such as PVC soft products, the flame retardant effect of zinc borate is poor. In order to obtain better effects, it is best to use it together with antimony oxide. Research shows that zinc borate has strong carbon-forming properties and can reduce the amount of smoke produced by materials. It is also an effective…Zinc borate and 1.5 parts by mass of antimony oxide, the oxygen index is 28.3%, 29.8%, 30.8% respectively, and the horizontal combustion is UL94 v-l, v-0, V-0.
In epoxy resins using tetrabromobisphenol A as the reactive flame retardant, a single zinc borate has little effect on its oxygen index and UL94 flame retardant performance, but if zinc borate is combined with antimony trioxide or antimony pentoxide The combined use of two antimonies has a certain synergistic effect. The smoke suppression effect of zinc borate on epoxy resin is related to the type of halogen flame retardant. For Dechlorane P1us 25 flame retardant epoxy resin Epon 828, 5 parts by mass of boron ester zinc can reduce the smoke amount by 40% compared with 5 parts by mass of antimony oxide. % (NITS smoke chamber method), but zinc borate has no smoke suppression effect in decabromodiphenyl ether flame retardant epoxy resin.
References
[1] Gu Baogen, editor-in-chief Ji Ying, Handbook of New Pesticide Varieties and New Mixtures 2008-2012, China Agricultural Press, 2013.05, page 169
[2] Song Xiaoping, editor-in-chief Han Changri, Agricultural Chemical Manufacturing Technology, Science and Technology Literature Press, 2012.03, page 496
[3] Compiled by Shanxi Institute of Chemical Industry, Plastics and Rubber Processing Aids (Second Edition), Chemical Industry Press, October 2002, Second Edition, Page 440
