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1.Polyethylene glycol series products can be used in pharmaceuticals. Polyethylene glycol with low relative molecular weight can be used as solvent, co-solvent, O/W emulsifier and stabilizer, used to make cement suspensions, emulsions, injections, etc., and also used as water-soluble ointment matrix and suppository matrix, solid waxy polyethylene glycol with high relative molecular weight is often used to increase the viscosity and solidification of low molecular weight liquid PEG, as well as compensate other drugs; For drugs that are not easily soluble in water, this product can be used as a carrier of solid dispersant to achieve the purpose of solid dispersion, PEG4000, PEG6000 is a good coating material, hydrophilic polishing materials, film and capsule materials, plasticizers, lubricants and drop pill matrix, for the preparation of tablets, pills, capsules, microencapsulations, etc.
2.PEG4000 and PEG6000 are used as excipients in the pharmaceutical industry for the preparation of suppositories and ointments; It is used as a finishing agent in the paper industry to increase the gloss and smoothness of paper; In the rubber industry, as an additive, it increases the lubricity and plasticity of rubber products, reduces power consumption during processing, and prolongs the service life of rubber products.
3.Polyethylene glycol series products can be used as raw materials for ester surfactants.
4.PEG-200 can be used as a medium for organic synthesis and a heat carrier with high requirements, and is used as a moisturizer, inorganic salt solubilizer, and viscosity adjuster in the daily chemical industry; Used as softener and antistatic agent in the textile industry; It is used as a wetting agent in the paper and pesticide industry.
5.PEG-400, PEG-600, PEG-800 are used as substrates for medicine and cosmetics, lubricants and wetting agents for rubber industry and textile industry. PEG-600 is added to the electrolyte in the metal industry to enhance the grinding effect and enhance the luster of the metal surface.
6.PEG-1000, PEG-1500 is used as a matrix or lubricant and softener in the pharmaceutical, textile and cosmetic industries; Used as a dispersant in the coating industry; Improve the water dispersibility and flexibility of the resin, the dosage is 20~30%; The ink can improve the solubility of the dye and reduce its volatility, which is especially suitable in wax paper and ink pad ink, and can also be used in ballpoint pen ink to adjust ink viscosity; In the rubber industry as a dispersant, promote vulcanization, used as a dispersant for carbon black filler.
7.PEG-2000, PEG-3000 are used as metal processing casting agents, metal wire drawing, stamping or forming lubricants and cutting fluids, grinding cooling lubricants and polishes, welding agents, etc.; It is used as a lubricant in the paper industry, etc., and is also used as a hot melt adhesive to increase rapid rewetting capacity.
1. Production: basalt fiber fabric is made of continuous basalt fiber textile yarn through warping, weaving and coating.
2. Weaving methods according to requirements: unidirectional cloth, plain cloth, twill cloth and grid cloth.
2. Application: reinforced mesh cloth, fireproof cloth, fishing rod cloth, luggage decoration cloth, electrical insulation cloth, bulletproof cloth, etc.
3. Packaging: 100M / roll (or customized as required).
4. Performance: high strength, high temperature resistance, good electrical insulation, non hygroscopic, acid and alkali corrosion resistance.High temperature resistance 1000 �° C
5. Specification and model: bfw16 * 20-100 (120)
BFW: basalt fiber fabric;Completely replace carbon fiber sheet building reinforcement
16 * 20: the warp and weft density of yarn is 16 and 20 pieces / cm respectively;
100: the width of the fabric is 100 cm;
(120): the mass per unit area of fabric is 120 g / m2.
BFNP5*5-200(160)
BFNP: basalt fiber mesh cloth (coated and shaped);
5 * 5: the longitude and latitude mesh size of the cloth surface is 5 and 5mm;
200: the width of the grid is 200 cm;
(160): the weight of grid cloth per unit area is 160g / m2.
Properties of urea
Urea, also known as carbamide, carbamide and urea. Pure urea is white, tasteless, odorless, needle shaped or prismatic crystal, with a melting point of 132.7 â?? under normal pressure. It is hygroscopic, deliquescent, hydrolyzable, and weakly alkaline. It is made into compound fertilizer with acid fertilizer. Urea is an organic compound composed of carbon, nitrogen, oxygen and hydrogen. It is a white crystal. Urea is one of the simplest organic compounds. The most important use of urea is as fertilizer. Its nitrogen content is more than 46%. After being converted into ammonium carbonate in soil, urea is hydrolyzed and absorbed by plants. It is the nitrogen fertilizer with the highest nitrogen content at present.
Molecular formula of urea: CO (NH2) 2, molecular weight 60.06, density 1.335g/cm �³ï¼? The melting point is 132.7 â??. Soluble in water and alcohol, insoluble in ether and chloroform. It is slightly alkaline. It can react with acid to form salt. It has hydrolysis. Condensation reaction can be carried out at high temperature to produce biuret, triuret and cyanuric acid. Heat to 160 â?? and decompose to generate ammonia gas and turn into cyanic acid at the same time. Urea can be hydrolyzed into ammonia and carbon dioxide under the action of acid, alkali and enzyme (acid and alkali need to be heated). Unstable to heat, heat to 150 â??ï½? 160 â?? to deamination to biuret. Urea is easily soluble in water, 105g can be dissolved in 100ml water at 20 â??, and the aqueous solution shows neutral reaction. There are two kinds of urea products: crystalline urea is white acicular or prismatic crystal with strong hygroscopicity; Granular urea is a translucent particle with a particle size of 1~2mm, which has a smooth appearance and improved moisture absorption.
Urea is a physiologically neutral fertilizer, which does not leave any harmful substances in the soil and has no adverse effects after long-term application. However, a small amount of biuret, also known as biuret, will be produced when the temperature is too high during granulation, which has an inhibitory effect on crops. Urea is molecular before conversion and cannot be adsorbed by soil, so it should be prevented from being lost with water; The ammonia formed after conversion is also volatile, so urea should also be deeply covered with soil. Urea is the first synthetic organic substance and widely exists in nature, such as 0.4% urea in fresh human feces.
The new version of national standard GB/T2440-2017 for urea has been officially implemented since July 1, 2018. Compared with the replaced 2001 standard, certain adjustments have been made.
New standard GB/T2440-2017
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