Hydroxypropyl methyl cellulose is a kind of non-ionic cellulose ether which is made from natural macromolecular material cellulose through a series of chemical processing. They are a white powder that swells into a clear or slightly turbid colloidal solution in cold water. It has the characteristics of thickening, adhesion, dispersion, emulsification, film forming, suspension, adsorption, gel, surface activity, water retention and colloid protection. Hydroxypropyl methyl cellulose and methyl cellulose can be used in building materials, coating industry, synthetic Resin, ceramic industry, medicine, textile, agriculture, daily chemical and other industries.
2. Improve the wet strength and the adhesion of the plate after extrusion.
â—† gypsum plaster and gypsum products
Hydroxypropyl Methyl Cellulose,HPMC,Cellulose Ether,Tylose HENAN JINHE INDUSTRY CO.,LTD , https://www.hncarbonblack.com
Small mold cavities, as well as small complex-related component forming surfaces, are often machined with several different integral end mills. Large-scale molds, large-scale related parts and components are economic reasons, often used for rough machining with indexable insert end mills, and high-precision machining with their own high-precision, relatively expensive, and fine-diameter integral end mills. At present, the diameter of solid carbide end mills is approximately 0.1-Ф25 (high-speed steel can be made coarse, even reaching more than 60). With an indexable insert end mill, it can be Ф160 or even larger as needed. However, its minimum size is limited because the blades used are smaller and the screws fixing the blades are thinner and are limited by insufficient strength. The general minimum diameter is about 10%. The function is simple, and individual cases, such as milling cutters that only process chamfers, etc., may be made even finer, even to Φ4.
Because of the thicker indexable insert end mills, many companies have developed replaceable inserts with indexable inserts to save on arbors. The cutter head is damaged. Replace one cutter head and continue to use it. Because the connection method and size are the same, it can also change the end milling cutter head of other processing functions to process various shapes of the surface of the parts, so as to realize the process concentration. In one installation, the processing is completed or most of the entire parts are completed, and the work efficiency is greatly improved. And the accuracy of each surface position.
The inserts of indexable inserts can be replaced, and the expensive solid carbide end mills are worn. After regrinding a few times, they cannot be processed to meet dimensional accuracy requirements and must be scrapped. This is really a great waste of resources. Mitsubishi has been pioneering the development of a replacement solid carbide end mill cutter head, which is of great significance. It is worth adopting, learning from, and promoting. The world's first full-face milling cutter + replaceable solid carbide insert is the iMX series. Its structure is shown in Figure 1. Inside the cutter head and in the shank, there is a structure that can form bolts and nuts. The bolt and nut structure is made of steel, which is resistant to impact, good toughness, and replaces the connection. The centering function of both is to rely on the cones of the two carbide parts, the conical bores, and their shoulder and end faces. This is a highly rigid two-sided constraint positioning method (Figure 2). The elastic modulus of the steel arbor is 2×104, and the elastic modulus of the cemented carbide arbor reaches 6×104. Except that the connecting part is steel, the supporting and positioning part is entirely a hard alloy part, so the rigidity is greatly improved. Since it is a two-body combination, the rigidity is a little lower than that of a one-piece solid carbide end mill, but the rigidity is much higher than that of other structures, which is about 30% (Fig. 3). For reliable connection, different diameter end mills specify the tightening torque to be achieved. When the two bodies are assembled together, the radial run-out precision can reach 0.015 at Φ10-20. At Ф20, it can also be within 0.02. The axial accuracy of the cutter head replacement can reach ±0.02.
Chemical equation:
Hydroxypropylmethylcellulose (HPMC) [C6H7O2 (OH) 3-m-n (OCH3) m (OCH2CH (OH) CH3) n] x
Application field:
â—† Cement-based plastering
1. Improve the uniformity, make the plastering easier to apply, and improve the anti-sagging ability. Enhance mobility and pumpability to improve work efficiency.
2. With high water retention, it can prolong the working time of mortar, improve the working efficiency, and help the mortar to form high mechanical strength during the solidification period.
3. The air infiltration is controlled to eliminate the micro-cracks of the coating and form an ideal smooth surface.
â—† Light board
1. It enhances the machinability of the extruded lightweight board, and has adhesive strength and lubricity.
2. High water retention, extending the working time of mortar, and producing high mechanical strength during solidification.
3. By controlling the uniformity of mortar consistency, a high-quality surface coating is formed.
â—† Masonry mortar
1. Enhance the adhesion with the masonry surface, and can enhance the water retention, so that the strength of mortar can be improved.
2. Improve the lubricity and plasticity to improve the construction performance. The use of cellulose ether reinforced mortar is easier to use, save time, and improve cost efficiency.
3. The model with special high water retention is available for the bricks with high water absorption
â—† Plate joint filler
1. Excellent water retention, can prolong the cooling time and improve work efficiency. High lubricity makes application easier and smoother.
2. Improve the shrinkage resistance and cracking resistance, and improve the surface quality.
3. Provide a smooth and uniform texture, and make the bonding surface more adhesive.
â—† Tile adhesive
1. The dry mixing ingredients are easy to mix without agglomerates, thus saving working time. As the application is faster and more effective, it can improve the constructability and reduce the cost.
2. The tiling efficiency is improved by extending the cooling time. Achieve adhesion effect.
3. Special development models with high skid resistance are available.
â—† Water-based paint and paint remover
1. The storage life is extended by preventing solid precipitation. It is compatible with other components and has high biological stability.
2. It dissolves quickly without lumps, which helps to simplify the mixing process. The cold water dispersion model can make the mixing faster and more convenient,And it does not produce lumps.
3. It produces favorable flow characteristics, including low splashing and good leveling, which can ensure excellent surface finish and prevent paint sagging.
4. Enhance the viscosity of water-based paint remover and organic solvent paint remover, so that the paint remover will not flow out of the workpiece surface.
â—† Self-leveling floor materials
1. It provides viscosity and can be used as an anti-settlement agent.
2. Enhance mobility and pumpability, thus improving the efficiency of paving.
3. Control water retention to greatly reduce cracking and shrinkage.
The innovative structure of solid carbide end mills with interchangeable heads
The overall structure of the end mill is divided into an integral end mill and an end mill with indexable inserts. Two categories of end mills to meet the processing needs, the company designed and manufactured a variety of different sizes of head; structure shape; spiral angle; teeth number and other products. In the past, the overall end mill was mainly made of high-speed steel. In order to improve machining efficiency and machining quality, solid carbide end mills with higher hardness, higher wear resistance, better rigidity and higher machining accuracy are used more and more widely. . Because it is more expensive than solid carbide. Especially large diameters are thicker. So just like turning knives and face milling cutters, end mills are also equipped with indexable inserts. In accordance with processing requirements, indexable inserts can be made into a variety of end mills with different functions.