Hebei Daily Chemical hydroxypropyl methylcellulose manufacturer. [three energy chemical industry] solubility of HPMC: soluble in water and some solvents, such as ethanol / water and propanol / water in appropriate proportion. The aqueous solution has surface activity. With high transparency and stable performance, the gel temperature of different specifications is different, the solubility changes with viscosity, the viscosity is lower and the solubility is greater. The performance of HPMC with different specifications has certain difference. The dissolution of HPMC in water is not affected by pH value. During the construction of steel fiber, attention shall be paid to: 1) before the mixing of steel fiber concrete, the ratio of water and stone in the steel fiber concrete shall be ensured to prevent the occurrence of bubble cracks when the steel fiber concrete agglomerates, so as to ensure the normal operation of the concrete pouring procedure; (2) during the pouring process, attention shall be paid to the lap joint between 15-20cm during the pouring to ensure the continuity of concrete pouring (3) in the process of vibration, plate vibrator shall be used to ensure that the steel fiber is distributed randomly and evenly; (4) the road surface shall be mechanically trowelled to prevent the steel fiber from being exposed; (5) after that, the road surface shall be well protected, and the creator shall organize special personnel to protect and maintain the road surface regularly.
Redispersible latex powder is water-soluble and redispersible powder. It is made from vinyl acetate produced by natural gas acetylene and ethylene produced by ethanol dehydration, and is made of polymer emulsion with other auxiliary materials through emulsion polymerization process. It is divided into ethylene / vinyl acetate copolymer, vinyl acetate / tertiary ethylene copolymer, acrylic acid copolymer and so on, and polyvinyl alcohol is used. As a protective colloid. A: the re dispersible latex powder can be dispersed to form a mold and play a bonding and strengthening role as the second adhesive; the protective colloid is absorbed by the mortar system (it will not be said to be damaged after the mold is formed). As reinforcement materials, the molded polymer resin is distributed in the whole mortar system, thus increasing the cohesion of mortar. 2. What are the functions of redispersible latex powder in wet mortar? Answer: improve construction performance; improve fluidity; increase thixotropy and sag resistance; improve cohesion; extend opening time; enhance water retention; 3. What is the role of redispersible emulsion powder after mortar curing? Answer: improve the tensile strength; enhance the bending strength; reduce the elastic modulus; improve the deformability; increase the density of the material; improve the wear resistance; improve the cohesive strength; reduce the depth of carbonization; reduce the water absorption of the material; make the material hydrophobic (add the hydrophobic rubber powder).
The higher the content of short fiber rate is, the lower the yarn strength is, the higher the uneven strength is; the higher the short fiber rate is, the worse the horizontal holding and longitudinal hooking capacity of the short fiber is, and it is easy to break when it bears the tension, which affects the strength of the yarn. The higher the content of short pile, the more the number of fibers in the yarn section, the more the number of head and tail, it is easy to stretch out the main part of the yarn, and the greater the possibility of causing yarn hairiness. At the same time, in the process of unwinding, under the action of high-speed and violent friction, there will be a sharp increase in hairiness. Therefore, strengthening the control of staple fiber is of positive significance to improve the yarn quality. Nylon, the scientific name of polyamide fiber, is a synthetic fiber developed by DuPont company in 1938, commonly known as nylon. In 1958, polyamide products were successfully trial produced in Jinzhou Chemical Plant of Liaoning Province and successfully spun into fibers, which opened the prelude of China's synthetic fiber industry. This kind of polyamide fiber is named "nylon" because it was born in Jinzhou Chemical Plant. The main products (98% of the total nylon) are PA6 fiber and PA66 fiber, the others (2% of the total nylon) are PA1010, PA11, PA12, PA610, pa612, PA46, pa1212, etc. At present, nylon has become a chemical fiber used in cotton spinning field after polyester and viscose. Nylon short fiber length is generally 35mm-150 mm, linear density is generally 0.8d-40d, divided into cotton type, medium length type and wool type.
Most of the "resin" rubber powder on the market contains DBP, a chemical that has been reported in the media to affect male sexual function. A large number of this kind of rubber powder is piled in the warehouse and the laboratory, which has certain volatility. In Beijing market, there have been a variety of names of "rubber powder" soaked in solvent before: high-strength water-resistant rubber powder, resin rubber powder, etc., typical characteristics: 1. Poor dispersion, some feeling wet, some feeling flocculent (should be porous material of sepiolite type), some doing white slightly dry but still very unpleasant. 2. It smells very pungent. 3. Some have added colors, and the current colors are white, yellow, gray, black, red, etc. 4. The dosage is very small, 5-12kg for one ton. 5. The early strength is amazing. The cement is not strong in three days, and the insulation board can be corroded and stuck. 6. It is said that XPS board can be used without interfacial agent. Disadvantages 1. The weatherability of the solvent is a big problem. It will evaporate in a short time under the sun. Even if it is not under the sun, the bonding interface will decompose faster due to the cavity construction. 2. Aging resistance, solvent is not temperature resistant, as we all know. 3、 Because the bonding mechanism is to dissolve the interface of the insulation board, otherwise, it also destroys the bonding interface. If there is a problem in the later period, the impact will be fatal. 4. There is no application precedent in foreign countries. Based on the mature basic chemical engineering experience in foreign countries, it is impossible to find this material.
Improve the crack resistance of commercial concrete. The cracks of commercial concrete mainly occur before the hardening of commercial concrete. In this stage, due to the evaporation and transfer of water, the internal plastic cracks of commercial concrete are produced. After adding polypropylene engineering fiber, a uniform three-dimensional non directional distribution support system is formed in the interior of commercial concrete, which can delay and prevent the occurrence and development of plastic cracks in early commercial concrete, so it is more effective. Improve the impermeability of commercial concrete. When a small amount of fiber is added into commercial concrete, the early generation and development of dry shrinkage cracks and segregation cracks are restrained. Therefore, it can be used in commercial concrete projects with high impervious requirements, such as dams, commercial concrete impervious panels, water diversion tunnels, basements of industrial and civil buildings, water storage pools, roof water proofing and other projects.