1. It is not conducive to the exertion of the efficacy of the drug in the winter when the weather is cold, which is not conducive to the effect of the drug. Therefore, it should be applied during the period when the temperature is relatively high. At this time, the physiological metabolism of weeds is relatively strong, which is conducive to the conduction of the agent in the weeds, the metabolic decomposition is difficult, and it is easy to receive a good herbicidal effect. For example, after entering December, weeds are used to control weeds in wheat fields. It is basically difficult to kill weeds, especially herbicides such as isoproturon. When the temperature is too low, they should not be used. It should be postponed until the end of February or 3 When the temperature rises at the beginning of the month, according to the growth of weeds in the field, appropriate herbicides are used to prevent them.
2 application should be balanced and thoughtful. In the winter high temperature period, the herbicide is used. Some weeds are blocked by growth and finally dead, but low-temperature weeding has no such effect. It can't rely on the pesticide to kill the weeds. Therefore, the application of the drug should be strictly in accordance with the dilution factor, and the amount of water should not be reduced at will. When spraying, pay attention to thoroughness, no heavy spray, no leakage, and all herbicides should be sprayed with herbicides.
3. It is necessary to have certain patience to use herbicides during low temperature seasons in winter, and the display time of the efficacy is obviously longer than that of the herbicides used in high temperature seasons. For example, rapeseed fields and vegetable fields can be used to control bluegrass, and general farmland needs 12 The phenomenon of grass dryness will occur in -15 days, and the foxtail grass that is used to control farmland in the high temperature stage in summer will generally die within 5-7 days. Therefore, you should wait patiently after taking the medicine. As long as the timing is well grasped, the liquid medicine is sprayed into place and generally does not need to be re-medicated.
4. Choose a variety of methods of use Some herbicides are mixed with soil to make toxic soil, or mixed with fertilizer to make poisonous fertilizers. It is safe to use at low temperatures in winter, and the efficacy is also stable. If you use oatmeal enemy, you can mix 500g oats with 50kg of fine soil, sand or 7.5kg of urea or 15kg of superphosphate. Spray a small amount of water when mixing, so that the medicine and soil or fertilizer are fully mixed. Immediately after the application, the ground is smashed, and the soil or fertilizer is thoroughly mixed with the soil to improve the herbicidal effect.
5 Adding nitrogen fertilizer to improve herbicidal effect When using 2,4-D sodium salt in wheat field, ammonium nitrate, ammonium sulfate and urea are mixed, which can significantly improve the herbicidal effect of 2,4-D sodium salt. Because the addition of chemical fertilizer reduces the tension and pH of the surface of the solution, the adhesion of the agent is enhanced, thereby improving the herbicidal performance of the herbicide.
(1)Tubing : CPVC is mainly used for processing tubing and hot water delivery and corrosion medium. It can keep enough strength if the temperature is less than 100℃ and can be used for long time under higher inner pressure. CPVC pipe can be used as hot sewage pipe, electroplating solution piping, thermochemistry agent transfer piping of enterprises and the wet chlorine transfer piping.
(2) Fitting : CPVC Resin can be used to produce the fittings of flow pipe, filtering material, and spin-drier etc, as well as electrical appliances and electronic parts such as wire way, conductor protective layer, electric switch, fuse closure door and insulation material of cable. etc.
(3) Corrugated board : the CPVC corrugated board has the natural corrosion resistance, resistance to high (low) temperature, heat insulation performance is excellent.
(4)Foaming material :The heat resistance of foaming material of CPVC is better than that of PVC. The shrinkage at high temperature is very small. It can be used as heat preservation material of heat water pipe and steam pipe and so on. The retentivity to solvent of CPVA with chlorine content more than 60% is very good. The CPVC can be put into the solvent for foaming which can produce the gas while heated, and you can get the homogeneous and minor forming gas. The solvent such as hydrocarbon, aether and aldehyde etc with boiling point of 50- 160℃ can be used as vesicant.
Packing and Storage :
Kraft-paper bag, Net Weight of 25±0.2kg per bag ; the product should be stored in dry and ventilated warehouse, to prevent sunlight and moisture, stack height no more than 10 bags, It is not dangerous cargo.
Advantage of CPVC Resin
CPVC resin has excellent high temperature resistance, corrosion resistance and flame retardant properties, widely used in production of different industrial pipe, hot and cold water pipe and fire fighting pipeline, superiority as follows :
(1) Widely use scope: CPVC the vicat softening point higher 40℃ than PVC resin, rigid PVC products safe use of the average temperature is not more than 60℃, and CPVC hard products can be used between 40℃ and 98 ℃ for a long time, it`s the few polymer can be used in high temperature and high pressure.
(2) The superior mechanical properties : CPVC tensile strength than PVC increases by about 50%, than ABS resin, PP resin increases by about 1 times. Especially close to 100℃, CPVC can still maintain a strong rigidity, can fully meet at this temperature to the requirements of the equipment and pipeline.
(3) Chemical resistance: CPVC not only in room temperature resistance to chemical corrosion performance is excellent, and at higher temperature still has the very good acid and alkali resistance, chemical resistance, far better than PVC and other resin.
(4) Good flame retardant : CPVC excellent flame retardant automatic quench, the time limit oxygen index is sixty, because in the air will not fire, with no flame drip, restricted diffusion flame and the smoke generation characteristics.
(5) Thermal conductivity: heat conduction coefficient of CPVC is only 0.105 KW/(mk), with CPVC processing of heat pipe, heat loss, less of heat insulating layer.
(6) From the influence of residual chlorine in water, Polyolefin materials (such as PP, PE) meet water residual chlorine can be decomposed, and CPVC is not be water residual chlorine influence, won't appear crack and drip.
(7) Processing formability: The same processing methods with PVC products, very easy and convenient
CPVC Compound,Pipes Grade CPVC Compound,Fittings Grade CPVC Compound
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