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Hot search keywords:Natural Barium Sulfate(Barite),Precipited Barium Sulfate,Titanium Dioxide
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YuanLei little knowledge | Application and index requirement of nano calcium carbonate in plastics
Nano calcium carbonate refers to the particle size of 1-100nm functional inorganic filler, widely used in rubber, plastics, paper, ink, paint, sealant and adhesives, medicine, toothpaste, food and other fields. However, different applications have different requirements on particle size, crystal shape, oil absorption value and dispersion of nano-calcium carbonate.
The plastic industry is currently the world's largest use of nano calcium carbonate industry, it can act as plastic regulator and reinforcement agent, the demand is very large. Because nano calcium carbonate has good dispersion, it can remove the voids and bubbles in plastics well, so that plastics can shrink more evenly, and improve the mechanical properties and thermal stability of plastics.
The technical requirements of the plastic industry for nano calcium carbonate are as follows:
Oil absorption value: plastic industry on nano calcium carbonate oil absorption value requirements are generally very low, because nano calcium carbonate particle size is small, specific surface area is large, if the oil absorption value is large, mixing consumption of plasticizer is more, so that the system viscosity increases, not only affects the processing performance, but also increases the production cost.
Crystal shape: The morphology of nano calcium carbonate can be divided into: cube, nearly spherical, spindle shape, rod shape, chain shape, needle shape, etc. The cube with low oil absorption value, or the cube part of the chain shape and spherical is appropriate.
Particle size: The particle size of nano-calcium carbonate used in plastics is generally controlled at about 80-120nm. Too large particle size can not reflect the effect of nano-calcium carbonate and affect the smooth surface of products. Particle size is too small will lead to the increase of surface energy, serious particle agglomeration, processing is not easy to completely disperse, resulting in the surface of the product particles.
Dispersion: should choose the high dispersion of nano calcium carbonate, if the nano calcium carbonate agglomeration is serious, the secondary particle size will be much larger than the primary particle size, and plastic processing mixing shear force is not too strong, some serious agglomeration of nano calcium carbonate is not easy to break up, in application will cause local defects, resulting in product quality problems.
Moisture: Moisture control should not be higher than 0.5%, if the moisture is too high, the plastic surface will produce bubbles or empty drum phenomenon.
pH value: The pH value of nano calcium carbonate should be controlled below 10. If the PH value is high, it will affect the whiteness and surface glossiness of the products and make the appearance deteriorate. At the same time, high pH will also increase the viscosity of the system, affecting the processing process.
Hydrochloric acid insoluble matter: mainly refers to the product in the black spots, yellow spots and other impurities particles, need strict control, otherwise more particles, easy to cause in the process of processing extruder filter frequent blockage, affect the production efficiency, sometimes in the surface of the product formed obvious black spots, affect the appearance of the product quality; Fine particles containing iron may increase the yellowness and decrease the whiteness of products. Special attention should be paid to nano-sized calcium carbonate used in light-colored products.
Among all kinds of non-metallic mineral powder materials applied in the plastic industry, calcium carbonate is the largest, accounting for about 60 ~ 70% of the total amount of plastic additives, but there are still many problems in the high performance application research, especially how to solve the agglomeration of nano-calcium carbonate, how to improve the dispersion effect of nano-calcium carbonate, how to improve the bonding strength of composite materials and other aspects have not been effectively solved.
2hours ago
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YuanLei little knowledge | Application field of titanium dioxide
The technical name of Titanium Dioxide is Titanium Dioxide, a dye and pigment. Its molecular formula is TiO2 with a molecular weight of 79.8658.
Titanium dioxide is the most important white pigment, with high refractive index, good chemical stability, weather resistance, whiteness, high achromism and covering power, and non-toxic and harmless, no stimulation to the human body, widely used in coatings, plastics, paper, ink, pharmaceuticals, fibers, cosmetics and other fields.
Application field
【Paint】：Coating is a viscous suspension composed of base material, pigment, solvent and additives. Titanium dioxide is used in paints as a pigment. The pigment has the ability to cover and decorate, so as to achieve the role of beautiful decoration. At the same time, the pigment can also enhance the mechanical strength and adhesion of the coating film, which can extend the service life of the coating film.
【Plastic】：The plastics industry is the second largest user of titanium dioxide, usually titanium dioxide consumption in the field of plastics accounts for 20% of the consumption of titanium dioxide application field. The application of titanium dioxide in plastic products, in addition to the use of its high hiding power, high achromatic power and other pigment properties, it can also improve the heat resistance of plastic products, light resistance, weather resistance, so that plastic products from UV invasion, improve the mechanical and electrical properties of plastic products.
【Paper making】：As paper filler, mainly used in high-grade paper and thin paper. Adding titanium dioxide to the paper can make the paper with good whiteness, good luster, high strength, thin and smooth, printing does not penetrate, light quality. Papermaking titanium dioxide generally uses anatase titanium dioxide without surface treatment, can play the role of fluorescent brightening agent, increase the whiteness of paper. But laminated paper requires the use of surface treated rutile titanium dioxide, in order to meet the requirements of light and heat resistance.
【Ink】：White powder or advanced ink in the indispensable white pigment. The ink containing titanium dioxide is durable and does not change color. It has good surface wettability and is easy to disperse. The ink industry used titanium dioxide rutile type, also anatase type.
【Ceramics】：Ceramic industry is also an important field of titanium dioxide application, ceramic titanium dioxide has high purity, uniform particle size, high refractive index, has excellent high temperature resistance, under 1200℃ temperature conditions to maintain 1 hour unchanged ash characteristics. High opacity, thin coating, light weight, widely used in ceramics, architecture, decoration and other materials.
1 day ago
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YuanLei little knowledge | The application range of Lide powder
Lide powder white crystalline powder. It is a mixture of zinc sulfide and barium sulfate. The more zinc sulfide it contains, the stronger its covering power and the higher its quality. Density 4.136~ 4.34g /cm3, insoluble in water. In the case of acid decomposition is easy to produce hydrogen sulfide gas, hydrogen sulfide and alkali solution does not work. By ultraviolet radiation in the sun 6~7h into light gray, in the dark still restore the original color. It is easy to oxidize in the air and agglomerate after being wet.
The use of Lide powder
Lide powder can be used in paint, ink, rubber coloring. Similar in structure to zinc sulfide composition, containing barium sulfate composition, slightly less durable. The resistance to pulverization is poor. It is cheap and therefore can be used as a partial substitute for titanium dioxide.
1. paint: mainly used for water-based paint, blending paint as primer, all kinds of cellulose paint, alkali resistant coatings based on chlorinated rubber and polyurethane. Also because of its good hiding power, heat resistance, alkali resistance and fluidity, it is particularly effective for the production of lacquer cloth with color pigments, prolong the service life, can also be used in electrophoretic coatings and photoconductivity systems.
2. ink: Lide powder particle fine, loose structure, white color and good hiding power, so in the composition of ink and other colors can have a good match.
3. rubber, plastic: the use of Lide powder in plastics and pigments can play a role in brightening and improving the strength of products, Lide powder is easy to disperse quickly and make this kind of products convenient processing technology, especially the molding, calendering and flattening operation process. Not only that, but also because of its chemical inertness, it can also adapt to vulcanization in rubber processing.
4. building materials: not only can be used as water-based paint applied to the interior walls of buildings, but also can be used as wallpaper, floor paint, table and other plastic veneer filler.
5. papermaking, painting utensils: as a white opaque pigment used for a variety of paper filler, used for chalk, crayon, painting of white pigment.
6. others: can also be used as filler putty raw materials, adding 20% Lide powder in the concrete made of artificial stone without affecting its light resistance and solidification; Applied to fireproof polyester compound can increase the anti-impact and anti-electric properties; Jet engine dyes and thermal coating and insulation of recording materials and so on.
2 days ago
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YuanLei little knowledge | Mica powder of sericite powder
Sericite powder, a kind of mica powder, it belongs to the layered structure of silicate minerals.
Physicochemical property
Sericite belongs to monoclinic crystal, crystal is scaly, silky luster (Muscovite glass luster), pure block is gray, purple rose, white, diameter to thickness ratio >80, specific gravity 2.6-2.7, hardness 1-3, elastic, flexible, good wear resistance and wear resistance; Heat resistant insulation, insoluble in acid and alkali solution, chemical stability.
Test data: elastic modulus 1502-2134MPa, heat resistance 500-600 ℃, thermal conductivity 0.419-0.670W.(m.K) -1, electrical insulation 2000kv/mm, anti-radioactivity 5*10 14 thermal neutron /cm2 against illumination.
In addition, the chemical composition, structure and structure of sericite are similar to kaolin, but also has some characteristics of clay minerals, that is, good dispersion and suspension in water medium and organic solvent, fine white grain, viscosity, etc. Therefore, sericite has the characteristics of both mica minerals and clay minerals.
Product application
▼Rubber field
The inorganic fillers commonly used in the rubber industry are calcium carbonate, talc, clay, etc., they improve some functions of rubber products at the same time also weaken some properties, and sericite products as a multifunctional filler of rubber products, with a variety of properties. The unique structure with high diameter to thickness ratio improves the reinforcing effect, and the excellent sheet crystal shape greatly improves the air sealing. The polarized effect of mineral crystals and the interlayer water molecular interference effect, the effective shielding of ultraviolet, microwave and infrared rays, greatly improves the aging resistance of the products.
▼Plastics field
Plastic mica powder is a kind of natural functional powder filling material with high diameter to thickness ratio, high temperature resistance, acid and alkali resistance and wear resistance. Sericite is evenly dispersed in plastics, the object fluidity is good, easy to extrude granulation and injection molding, conducive to industrial production. Sericite compatibility is good, in plastics and other filling materials such as talcum powder, glass fiber, glass powder, microbeads, wollastonite fiber, silicon powder can be very compatible. At present, sericite is mainly used in PP, thermoplastic polyester, PC, PE, polymethyl hirene, PA, unsaturated polyester, phenolic plastics, PU and so on.
▼Coating field
Coating mica powder is a new type of functional green environmental protection filler, unique two-dimensional sheet blocking, shielding UV light, chemical structure stability and other functions effectively improve the coating film's permeability resistance, weather resistance, wear resistance and corrosion resistance, in addition, does not contain any radioactive elements, in line with the green trend in the field of coatings. It is widely used in building exterior wall coating, anticorrosive coating, powder coating, high temperature resistant coating, insulation coating, waterproof coating, road sign coating, radiation protection coating and some special coatings, such as ship coating, spacecraft thermal control coating and food ware coating.
▼Electronic field
Sericite powder can be used as a special functional filling material for copper clad plate, and can also be used for electronic pot-sealing adhesive, epoxy resin castable, plastic sealing material, LED packaging material, electronic component, etc. Can obviously improve the performance of materials, reduce the cost of materials, has a significant cost-effective advantage.
2023-02-04
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