Functions of 325 mesh 1250 mesh 4000 mesh calcined kaolin used in paint,ceramic,rubber and papermaking industry

Functions of 325 mesh 1250 mesh 4000 mesh calcined kaolin used in paint,ceramic,rubber and papermaking industry


Kaolin is a mixture of inorganic nonmetals. Calcination of kaolin means that kaolin is sintered in a calcining furnace to a certain temperature and time, so that its physical and chemical properties can be changed to meet certain requirements.


Calcined kaolin is produced by ultrafine grinding and calcination modification with advanced  equipment.The product has a pseudo-hexagonal porous and lamellar structure, and the porosity is about 75%.The porous and lamellar structure of kaolin has the advantages of plasticity, adhesion, dispersion, insulation, sintering, flame retardancy, fire resistance, adsorption, weathering resistance, chemical stability, high light scattering rate, good hiding power and so on.Widely used in papermaking, coating, papermaking filler, plastic, rubber, wire and cable, latex paint, road sign paint, powder coating and other fields.

Functions of 325 mesh 1250 mesh 4000 mesh calcined kaolin used in paint,ceramic,rubber and papermaking industry

Function of calcined kaolin in paints and coatings:

Calcined kaolin raw ore is mainly produced in the coal producing areas of North China, mainly Inner Mongolia and Shanxi. It belongs to sedimentary type. It is formed by grinding hard kaolin generated from coal seam for many times and calcining at high temperature. After such processing, calcined kaolin molecules lose crystal water and present fluffy porous sheet structure. Calcined kaolin has the characteristics of high whiteness, strong covering power, good fluidity, high oil absorption and good suspension. The properties of coatings and films obtained by adding this kind of fine calcined kaolin in latex paint will make us feel that kaolin is not only a common filler, but also a functional filler to improve the quality of paints and coatings.Calcined kaolin used in paints and coatings has the following advantages:

  1. Due to its hexagonal crystal structure and high refractive index, it greatly improves the contrast index (covering power) of the coating film and provides excellent color ductility.
  2. The flat property of kaolin can provide a good balance between the fluidity and leveling of paints and coatings. Flat particles also tend to have a flat surface.For sticky film, flat particles can improve the compressive adhesion of the paints and coatings.
  3. Kaolin is hydrophilic, so it is easy to disperse, with small bulk density and good suspension performance.
  4. It has a narrow range of colloidal particles, tends to keep the viscosity of the coating unchanged, and can provide the required rheological properties and contactdenaturation (high shear high flow and low shear low flow), so the film is relatively full, and can improve the floating color and the defects of the flower.
  5. Strong chemical inertness, small optical axis angle and high order of crystal shape will significantly increase the UV shielding ability of the paints and coatings.

Function of calcined kaolin in ceramics and glazes:

The function of kaolin in glazes is to form vitreous material.The ideal chemical formula of kaolin is Al2O3-2SiO2-2H2O, which, like quartz, feldspar, marble, etc., is the main component of forming glass.

Kaolin is mainly composed of Al2O3 and a small amount of silicon dioxide.Alumina content is more, can improve the viscosity of the glaze, so that the glaze fixed in the bad body is not easy to flow away, but relatively will also increase the firing temperature of the glaze, and will affect the diffusion of the glaze, so that the crystallization is more difficult to produce.


Function of calcined kaolin in paper industry:

Pure kaolin has high whiteness, soft quality, easy dispersion and suspension in water, good plasticity, high adhesion, and excellent electrical insulation performance.It has good acid solubility, low cation exchange capacity, good fire resistance and other physical and chemical properties.Therefore, kaolin has become a necessary mineral raw material for dozens of industries such as papermaking, ceramics, rubber, chemical, coating, medicine and national defense.Kaolin is widely used in paper industry.

There are two main areas, one is in the paper in the use of fillers, the other is in the surface coating process used pigments.Especially in recent years, the rapid development of modern science and technology has made the application of kaolin more extensive. Some high-tech fields begin to use kaolin as a new material in large quantities. Even the high-temperature resistant porcelain parts of atomic reactors, space shuttles and spacecraft are also made of kaolin.

The paper industry is the largest consumer of refined kaolin, accounting for about 60% of total kaolin consumption.


Application of kaolin in rubber industry:

Kaolin used in rubber industry is made of high-quality raw materials by washing and refining. The product has fine particle size, low moisture, stable PH and DPG absorbency, and the settlement volume is higher than the index stipulated by the Chemical Industry Department.All kinds of rubber products produced by this product have low abrasion, good strength and bending performance.The product is a semi-strong filler for the production of various rubber products.

Differences between calcined kaolin and washed kaolin:

First of all, calcined kaolin is calcined, and its crystal form and original soil have changed.Water – washed kaolin is only treated physically and will not change the nature of the original soil.

Secondly, the whiteness of kaolin varies greatly. Generally, after light burning, the whiteness of kaolin will increase, while that of washing will not increase significantly.

Third, different USES.According to different calcination temperature, kaolin can be used as papermaking additive and refractory aggregate.

Washable kaolin is commonly used as a papermaking filler.

In addition, calcined kaolin mainly refers to hard kaolin (coal measure kaolin). The original soil has no bonding property and cannot be directly used as raw material for papermaking or refractory materials, so it needs to be applied after calcination.The raw material of washable kaolin has adhesive property and can be used as refractory binder or papermaking filler directly.It can improve the aging-resistant ability of the film, prolong its service life, improve its heat preservation and promote the growth of crops.Changing the polarity of the film surface and inhibiting the formation of fog drops;And will be harmful to the crops ultraviolet light or green light into photosynthesis can use red orange light, referred to as longevity, high heat preservation, anti-fog drops and light four functions, is a new master with functional filler.

As a papermaking filler, calcined kaolin has a better whiteness and a higher cost.


Inner Mongolia Rational Industry Limited (IMRI) is a supplier of all kinds of high whiteness calcined kaolin clay such as 6250 mesh calcined kaolin,325 mesh calcined kaolin,2000 mesh calcined kaolin,1250 mesh calcined kaolin,4000 mesh calcined kaolin,etc.Please send your inquiry and get quotation from us if you need any kind of calcined kaolin.





Why is EVOH the highest barrier material ?

Why is EVOH the highest barrier material ?

Why is EVOH the highest barrier material ?

Ethylene Vinyl Alcohol, commonly abbreviated EVOH, is a formal copolymer of ethylene and vinyl alcohol.

EVOH has always been used as high barrier material. The film types of this material in addition to non-tensile type, there are bidirectional tensile type, aluminum evaporation type, and adhesive coating type, etc., bidirectional tensile type and heat resistant type for aseptic packaging products. EVOH is characterized by excellent barrier property for gas and excellent processing property, and excellent transparency, gloss, mechanical strength, elasticity, abrasion resistance, cold resistance and surface strength.

(1) Chemical Properties

Polyvinyl alcohol (PVA) has the lowest gas permeability of any polymer available today. However, PVA is water-soluble and difficult to process.

EVOH preparation method: first, ethylene and vinyl acetate copolymer were copolymerized, and then the copolymer was hydrolyzed to obtain ethylene – vinyl alcohol. Therefore, it still retained the high barrier function, but in the moistureproof and the processing performance aspect has the obvious improvement.

In terms of properties, EVOH copolymer is highly crystalline, and its properties mainly depend on the relative concentration of its comonomer. Generally speaking, when ethylene content increases, gas barrier property decreases, moisture resistance improves, and resin is easier to process. The most prominent feature of EVOH resin is its barrier to gases. It is used in packaging structures to improve retention of fragrance and quality by preventing oxygen infiltration. In the use of gas-filled packaging, EVOH resin effectively retains the carbon dioxide or nitrogen used to protect the product.

Due to the presence of hydroxyl groups in the molecular structure of EVOH resin, EVOH resin is hydrophilic and hygroscopic. When adsorbing moisture, the barrier property of gas will be affected. However, the moisture content in the barrier layer can be carefully controlled, which can be achieved by wrapping EVOH resin layers in a multi-layer technique using strong barrier resins such as polyolefin.


(2) Oil Resistance

EVOH resin also has strong resistance to oil and organic solvents. After immersion in various solvents and oils at 68°F for 1 year, the percentage weight gain was 0% for solvents such as p-cyclohexane, xylene, petroleum ether, benzene, and acetone, 2.3% for ethylene glycol, 12.2% for methanol, and 0.1% for salad oil.


(3) Thermal/mechanical Properties

EVOH resin has high mechanical strength, elasticity, surface hardness, wear resistance and weather resistance, and has a strong antistatic property.

EVOH films are highly transparent due to their high gloss and low haze.

EVOH resin is the highest thermal stability resin among all commercial strong barrier resins. This property enables the processing of waste products can be recycled and reused, the raw materials contain up to 20% of EVOH.


(4) Processing

There are three basic ways to provide compartments using EVOH in a multilayered structure. They are:

  1. Coextrusion structure: EVOH resin binds to polyolefin or polyphenolamine to form a framework.
  2. EVOH films are laminated to other substrates or coated with other materials.
  3. Resin is used as coating for various substrates or single-layer containers.

It can be easily processed on traditional manufacturing equipment without special changes.

Using commercial equipment, EVOH resin is suitable for the following processing: single or multi-layer thin film extrusion; Sheet and profile co-extruded; Co-extrusion blow molding; Coextruded coating; Lamination (or lamination) and injection molding.

Secondary processing such as heat forming, vacuum forming and printing of EVOH resin frames or EVOH films is easy. Like other polymers, EVOH resins can be modified by overheating.

Coating techniques including multilayer coatings or coextruded coatings can also be used to produce multilayer structures, resulting in structures very similar to coextruded structures.

EVOH resin can be used for spraying, immersion or roller coating methods. The production of carbonated beverage containers or to achieve the purpose of blocking solvents, spices or smell.

EVOH resins have poor adhesion to most polymers, and to overcome this difficulty a specially designed bonding resin or “bonding resin” is required. Except for nylon, EVOH resin can stick to nylon well without the use of adhesive resin.


(5) New development

With the increase of rigid and high barrier plastic packaging, new performance requirements for EVOH resin are put forward. To meet these requirements EVOH suppliers offer certain brands such as J102(EVAL -EVALCA, USA) and Goshei, Japan’s ST series. These products improve machinability and a wider range of molding. Other products, such as EVAL inc. ‘s F100 and E151, have been developed for better viscosity and better match the polyolefin typically used in rigid containers.

At the same time of accelerating the research of EVOH composite film, the tensile orientation of EVOH is also being studied abroad. The barrier property of the new EVOH film to gas is 3 times that of the existing high performance non-tensile EVOH film.

In addition, EVOH can also be used as a barrier material coated on other synthetic resin packaging materials to enhance the barrier performance.


(6) Applications

  1. Non-food applications include solvents, chemicals, air conditioner components, gasoline drum lining, electronic components, and packaging of medically related products.
  2. In the field of packaging, EVOH is made into a composite film as a intermediate barrier layer, which is used in all hard and soft packaging. In the food industry for aseptic packaging, hot cans and cooking bags, packaging dairy products, meat, canned fruit juices and condiments; Plastic containers of EVOH can completely replace glass and metal containersIn terms of food packaging. Many domestic aquatic products companies export seafood using five layers of PE/EVOH/PA/EVOH/PE co-extrusion membrane vacuum packaging.
  3. EVOH products can not only be used in film production, but also can be widely used in soft packaging of cosmetics, floor heating pipes, jelly cups and pesticide bottles, etc. As a non-toxic and environmentally friendly material, EVOH can not only improve people’s life quality, but also play an important role in environmental protection.


EVOH is currently produced by Changchun Group of Taiwan province, Synthetic Chemistry of Japan and KURARAY of Japan. Our company can supply you all grades of EVOH with high quality and competitive price. Sample is available, if you have any need, please feel free to contact me anytime.

What’s the usage of seamless steel pipes

What’s the usage of seamless steel pipes?

Seamless steel tubes have hollow sections and are widely used as pipelines for conveying fluids, such as pipelines for conveying petroleum, natural gas, gas, water and some solid materials.Steel tubes can be divided into round tubes and special-shaped tubes according to the shape of cross-sectional area.Since a circle has the largest area with the same circumference, more fluid can be transported in a circular tube.In addition, when the annular section bears internal or external radial pressure, the force is more uniform, so most steel tubes are round tubes.

However, the circular pipe also has certain limitations, such as under the condition of plane bending, the circular pipe is not as strong as square, rectangular pipe bending strength, some agricultural machinery framework, steel and wood furniture, etc., are commonly used square, rectangular pipe.Other special-shaped steel tubes with different section shapes are required according to different USES.

What’s the usage of seamless steel pipes?

Seamless steel pipes of different usage:

1.Seamless steel tubes for construction

Standards: GB/T8162, ASTM A501, JIS G344,ASTM A500

Common grades: 10#, 20#, 35#, 45#, 40Mn2, 45Mn2, 27SiMn, 20Cr, 40Cr, 20CrMo, 35CrMo, 38CrMoA1, 50CrV, 30CrMnSi


2.Seamless steel tubes for conveying fluids

Standard: GB/T8163,ASTM A53, ASTM A192, JIS G3452, DIN 1629

Commonly used steel grades: 10#, 20#, Q295, Q345


3.Line pipes and petroleum seamless steel casing & tubing

Standard: API 5CT,API 5L

Common grades: J55,K55,L80, N80,P110,grade B, X42,X46,X52,X56,X60,X65,X70


4.Seamless steel tubes for gas cylinders

Standard:GB 18248,EN 10297,EN 10083,JIS G3429

Commonly used steel grades:34Mn2V, 30CrMo, 35CrMo,37Mn,34CrMo4,30CrMoSiA,38Mn6,30CrMo4,42CrMo4


5.Seamless steel tubes for high pressure boilers

Standard: GB5310,ASTM A106, ASTM A210C, ATSM A213, JIS G3461, JIS G3462, DIN 17175,BS3059: Part 2

Common steel grades: 20G, 20MnG, 25MnG, 15MoG, 20MoG, 12Cr1MoVG, 15CrMoVG, 12Cr2MoG, 12Cr2MoWVTiB, 12Cr3Movsib


6.Seamless steel tubes for low and medium pressure boilers

Standard: GB3087,ASTM A179, ASTM A192

Common brands: 10#, 20 #


7.High pressure seamless steel tubes for fertilizer equipment

Standard: GB6479,ISO 9329-2

Common steel grades: 10#, 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo, 12Cr2Mo


8.Petroleum cracking seamless steel pipe

Standard: GB/T9948, JIS G3441

Common brands: 10#, 20#, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo


9.Seamless steel pipe for car half axle sleeve

Standard: Q/OHAD001 YB/T5035,DIN 1629

Common steel grades: 45Mn2, 45#, 25MnCr


10.Hot rolled seamless steel tubes for hydraulic props

Standard: Q/OHAD010  GB/T17398

Common steel grade: 27SiMn


11.Seamless steel pipe for ship

Standard: GB/T5312,DIN 2391

Commonly used brands: Q320, Q360, Q410, Q460 and Q490


12.Cold drawn precision seamless steel tube

Standard: GB/T3639, GB/T8713

Common steel grades: 10#, 20#, 35#, 45#, 30CrMo


13.Seamless steel pipe for geological drilling

Standard: YB/T5052,YB235

Commonly used steel grades: DZ40, DZ50


Seamless steel tube is a kind of economic section steel, has a very important position in the national economy, widely used in petroleum, chemical industry, boiler, power station, ship, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction and military sectors.IMRI supplies seamless steel pipes of all kinds of usages.Just tell us your requirements and you will get seamless steel pipes which meet your needs from us.