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What is the electrical heating film?
- Electrothermal film heating system is low-carbon heating supply high-tech products which is different from the dot mode heating system represented by radiator, air-condition and heating radiator; and the streamlined heating system represented by heating cable, researched and developed by using aerospace flight technology in the surface heating field. The electrothermal film is divided into high temperature electrothermal film and low temperature electrothermal film. High temperature electrothermal film is generally used in electric products, military and so on, the electrothermal film produced by present science and technology. The low temperature electrothermal film is a kind of semitransparent polyester film which can produce heat after being electrified, which is made by processing and hot-pressing the conductive special ink and metal current-carrying strip between the insulating polyester films.s
Is the decorative film environmental friendly?
- The decorative glass membrane is generally used for tooling, its role is mainly reflected in a decentralized direct light, logo marking and so on. And the decoration glass is frosted glass or diamond glass, high-grade point is art printing or embossing glass.s
Does anyone know the mechanism of ion exchange membrane
- the mechanism are as follows: Ion exchange resins are high molecular material with an ion exchange function. in the solution, the ion of itself will have an exchange with the ion which has the same symbol in the solution. According to the different nature of the exchange groups, the ion exchange resin can be divided into cation exchange resin and an anion exchange resin. Most of the cation exchange resin has a sulfonic acid group (-SO3H), carboxyl (-COOH) and phenol (-C6H4OH) and other acidic group, wherein the hydrogen ions in solution can have an exchange with a metal or other cation. For example, the polymers of styrene and divinylbenzene by sulfonation is giving strong acid cation exchange resin and the structure can be simply expressed as R-SO3H, wherein R represents a resin matrix, the exchange mechanism is 2R-SO3H + Ca2 + (R-SO3 ) 2Ca + 2H this is the mechanism of water softening. Anion exchange resin comprises quaternary amine [-N (CH3) 3OH], amino (-NH2 ) or imidogen (-NH2 ) and other alkaline group. They can generate OH- ions in the water, and have exchange interaction with a variety of anions, the exchange mechanism is R-N (CH3) 3OH + Cl- R-N (CH3) 3Cl + OH- due to the ion exchange is reversible, so the used ion exchange resin is suitable to wash with acid or base resin with a suitable ion exchange concentration, to restore the original state and repeated use, so the process is called regeneration. cation exchange resin can be washed with dilute hydrochloric acid, dilute sulfuric acid solution; the anion exchange resin can be treated with sodium hydroxide solution, etc., and then reproduced. ion exchange resins are widely used, and it is mainly for the isolation and refinement. For example, softening water system and producing deionized water, recycling metal in industrial wastewater, separating rare metals and precious metals separation and purification of antibiotics.s
What are the standards of geotechnical test methods?
- Common standards and codes related to geotechnical tests are as follows: (1) the railway engineering geotechnical test method "(TBJ102-96) (2) the geotechnical test method standard" (\ t50123-1999) (3) "road geotechnique test procedures" (JTJ051-93) (4) the water conservancy geotechnique test procedures in the "(SL237-1999) (5) the railway subgrade construction specifications, TB10202-2002 (6) the highway roadbed construction technology standard" JTJ033-950 geotechnical test in the regular program. (1) water content, density, proportion; (2) analysis of the particle size , liquid limit, plastic limit; (3) maximum density and minimum density of sand; (4) compaction test, bearing ratio test.s
what's the construction scheme of composite geo-membrane?
What kind of geomembrane does the channelanti-seepage film use?
- The channel seepage control is generally used in composite geotechnical membrane in a cloth a film specifications such as 200. The great subjects, like The South-to-north Water Diversion Project took use of the 150/0 two cloths film one film of the polyester filament anti-sticking composite geo-membrane.s
how to do when the film wrinkling
- Usually the problem is risen because the first paint is not dry then brushing the second time . Then the lower paint solvents will affect the upper membrane and make it wrinkled. in this case, it is available to use mercury chemical agents or heating the film to remove wrinkles, then re-painting. Remember, you have to wait for the first painting drying and then brushing the second time.s
What are the impermeable advantages of comosite geomembrane?
- composite geo-membrane is combined by geotextile and geomembrane, permeable material is mainly used in seepage-proof, the products have high extensibility and deformation, modulus, acid and alkali resistance, corrosion and chemical resistance, seepage-proof and other features.s
how to adjust a door closer
- The door closer is always used in the size of buildings and shopping malls,is widely used in the entrance of the office building, to avoid the spread of fire, the effective protect...
what is basalt rock
- What is basalt rock？Basalt belongs to basic volcanic rocks. It is the main component of the earth and the moon sea ocean crust, the earth crust is an important substance and luna...
What aluminium composite can be used for
- Description: Aluminium composite is with Nano-PVdF paint layer coated on front aluminium foil. Besides all good features of PVDF panel, but also coats PE(Polyester) paint and becau...
Difficulties of Project Management Construction
- As is known to all, project management construction is a vital specialized course of civil engineering major, which consists of several important objectives such as quality, time a...
What's the function of construction management certification
- A Certificate in Construction Management program is generally designed for individuals with work experience and a bachelor's degree. The curricula of these programs teach stude...