News

This product is a biodegradable and hydrolyzed polyvinyl alcohol (PVA) film with higher strength than polyethylene (PE) film and good transparency. Its characteristics, strong water absorption, can be completely degraded in water or soil, no pollution to the environment, the membrane is not static, does not vacuum, good printing performance, good resistance to oil and chemical substances, breathable and oxygen, can play Preservative preservation. Can be used for high-end clothing packaging; can be combined with polyethylene or polypropylene film production of food packaging bags; and paper materials into a gift bag; for anti-static requirements of the packaging, such as the packaging of electronic components. The increasing market demand has great potential. The film has advanced production technology and is the first to be created in China. The Institute has been engaged in the research and production of unsaturated polyester resin for 30 years; in the 1980s, it began to design large-scale unsaturated polyester engineering and transfer of special technology, and has completed 1,000 tons/year, 3000 tons/year, and 6,000 tons/year. Years of resin engineering.

Vinyl acetate is polymerized to form polyvinyl acetate. The polymer can be saponified to give various grades of flocculent, flake, granular, and powdery polyvinyl alcohol with 99.9% and 88% alcohol solvency under different amounts of alkali. The polyvinyl alcohol solution has good film-forming properties. Emulsification. Polyvinyl alcohol is mainly used for the production of synthetic fibers, plastics, adhesives, coatings, new building materials, etc., and is widely used in the chemical industry, textile, printing and papermaking, tanning industry, construction and so on. During the production process, the final polyvinyl alcohol precipitate produced by saponification must be pressed and dried to obtain the final product. Polyvinyl alcohol is more viscous and gel-like. The evaporation rate of surface water during drying is much faster than the migration of moisture inside the material to the surface of the particles. The migration of moisture is the limiting part of the drying speed. The heat required for this type of material is not large, and the drying speed is very slow. In general, direct drying with hot air is not suitable for the drying of such materials. At present, most manufacturers use a vacuum rake dryer to dry polyvinyl alcohol. Vacuum rake dryer only jacket is the heat transfer surface, plus the material can not fill the entire cylinder, so the jacket area is only 60% can be effectively used, which led to a very large volume of vacuum rake dryer, occupying space Large, increasing the investment in civil engineering; the movement of materials in a vacuum rake dryer cannot maintain a strict first-in, first-out principle. There are dead spots and stagnant zones, which can cause the retained materials to be heated and deteriorated and discolored for a long time. Hollow blade dryers are improved products for vacuum rake dryers. The vacuum rake dryer can handle a wide range of materials, but most of the hollow blade dryers can also handle materials that can be processed by the vacuum rake dryer. The main improvements are: 1. Change batch operation to continuous operation; 2, improve the utilization of the heat transfer surface; reduce the equipment volume; 3, the heat transfer surface and the material full contact, update, uniform heat transfer, shorten the processing time, reduce the material for a long time heat deterioration; 4. The flow path of the material in the dryer was changed, the microscopic spiral forward, the macroscopic piston flow; 5. The equipment is easy to clean when changing material types. Due to the characteristics of the hollow blade dryer, manufacturing level and the strength of the factory, Sanmenxia Pakide Drying Engineering Co., Ltd. won the bid for the equipment selection and bidding of a polyvinyl alcohol manufacturer in Shanxi Province, and provided a large-scale hollow blade dryer for the drying of polyvinyl alcohol.

With the continuous increase in the amount of concrete expansive agent, poor application and failure of use have occurred from time to time, and quality accidents causing leakage and cracking of concrete structures are also commonplace. As a result, some people have expressed doubts about the compensatory shrinkage of concrete expansive agents. Some people even refused to use the project. The following small series introduces the expansion agent usage method and expansion agent type. Expansion agent use method 1. Scientifically and reasonably select the amount of expansion agent, and the expansion agent must be adapted to the concrete mixing station. The purpose of fitting is mainly to determine the reasonable amount and method of incorporation according to the design expansion rate index. The method of incorporation is usually two methods of blending and partially replacing mineral admixtures. 2. It is reasonable to control the temperature of concrete pouring into the mold in the range of 30±5°C. 3, to strengthen concrete vibrators, more dense than ordinary concrete vibrators. 4. Scientific and reasonable maintenance methods. Strengthen conservation 7 days before pouring. Every day between 10:00 am and 4:00 pm, it should be sprinkled with water no less than 5 times. Every day after the 8-14th day, it should be once every morning and afternoon. It is not advisable to carry out watering maintenance at night and it is not advisable to carry out excessive maintenance in the winter. The strict combination of temperature monitoring for conservation is very important, keeping in mind the principle of temperature control for [heating at the warming stage and warming at the cooling stage". 5. It is not appropriate to use concrete with excessive mud content to produce concrete, and it is not appropriate to load the concrete prematurely. Expansion agent type 1. Calcium sulphoaluminate Among these types of swelling agents are: alumite swelling agents (the main components are alum and anhydrite or dihydrate gypsum); CSA swelling agents (the main component is anhydrous calcium sulfoaluminate); U-type swelling agents (main components are Anhydrous calcium sulfoaluminate, alum, gypsum, etc. 2, calcium oxide expansion agent There are various preparation methods for such expansion agents, such as calcined lime at a certain temperature, adding appropriate amounts of gypsum and water-quenched slag, and mixing lime and stearic acid; burning limestone, clay and gypsum at a certain temperature. The mature material is ground and then mixed with finely ground gypsum calcined at a certain temperature. 3, metal expansion agent Commonly used iron filings are formulated with iron powder mixed with an appropriate amount of oxidant (such as perchromate, permanganate, etc.). Expansion agent effect 1. Underground buildings: such as subways, underground parking lots, underground warehouses, tunnels, mines, civil defense projects, foundation pits, etc., mixing stations, etc. 2, pools, swimming pools, water towers, storage tanks, large containers, granaries, oil tanks, caves and other warehouses 3, high-strength highway pavement, bridge concrete surface, culverts, etc. 4. Prefabricated components, anchorage of frame structure joints, pipe joints, grouting material of post-prefabricated prefabricated components, backfilling of post-seam joints, magmatic grouting materials 5. Cement products: self-stressing, prestressing and prestressed concrete pipes, slabs, columns, beam columns, waterproof roof panels, etc.

Iron oxide is perfectly capable of being used as a pigment and has a long history. Dating back to cave paintings, ochre, a mineral rich in iron oxide. So the proportion of iron oxide pigments in the whole history of human painting is very large in oil painting. It can be 1/7 or 1/8 of a common color. If you have experience in buying oil colors. So you've seen the colors "iron oxide red", "ochre", "Mars black" and "Mars brown", which I mentioned in other answers: Mars = Mars = Mars = iron, which means Mars black is the literary name for iron oxide black. However, the problem comes to the iron oxide rust this kind of thing should do to become painting level? I once spent a year buying every mineral powder in sight. It was later discovered that the toner used for painting was still trusted by the high quality painting manufacturer. Painting toner needs to be acid resistant (not in oil reaction) light resistant, can mix colors, many requirements. More importantly, what we need in painting is beautiful hue... You can make iron oxide red... And then compare that to the earth red of old Holland... Discover the earth red color of good brand look how look how beautiful, bright and full. However, different iron oxide reds are dull and eventually absorb oil... I would like to give an example, the same grape, the origin and quality are different. It is good that this stuff is not wild, sour and inimitable, but the famous origin of Xinjiang makes you linger on, one by one... So you can try to make paint, and it's a lot of fun, but then you realize that it makes sense to sell good paint for a lot of money, and it makes sense to select paint after decades of hard work. I recommend giving it a try. But finally remind you, the unknown toner will produce painting life huge hidden trouble. Iron oxide is perfectly capable of being used as a pigment and has a long history. Dating back to cave paintings, ochre, a mineral rich in iron oxide. So the proportion of iron oxide pigments in the whole history of human painting is very large in oil painting. It can be 1/7 or 1/8 of a common color. If you have experience in buying oil colors. So you've seen the colors "iron oxide red", "ochre", "Mars black" and "Mars brown", which I mentioned in other answers: Mars = Mars = Mars = iron, which means Mars black is the literary name for iron oxide black. However, the problem comes to the iron oxide rust this kind of thing should do to become painting level? I once spent a year buying every mineral powder in sight. It was later discovered that the toner used for painting was still trusted by the high quality painting manufacturer. Painting toner needs to be acid resistant (not in oil reaction) light resistant, can mix colors, many requirements. More importantly, what we need in painting is beautiful hue... You can make iron oxide red... And then compare that to the earth red of old Holland... Discover the earth red color of good brand look how look how beautiful, bright and full. However, different iron oxide reds are dull and eventually absorb oil... I would like to give an example, the same grape, the origin and quality are different. It is good that this stuff is not wild, sour and inimitable, but the famous origin of Xinjiang makes you linger on, one by one... So you can try to make paint, and it's a lot of fun, but then you realize that it makes sense to sell good paint for a lot of money, and it makes sense to select paint after decades of hard work. I recommend giving it a try. But finally remind you, the unknown toner will produce painting life huge hidden trouble.