The mahogany door and the hardwood door are two products of the industry. Although the quality and performance of the products are higher than other types of wooden doors, they need to be well maintained. Let's take a look at the technical formula to prevent the deformation of mahogany and hardwood. Rosewood, rosewood, wenge, rosewood and other valuable hardwoods, commonly known as redwood, is a legume, deciduous tree. Because of its hard texture and stable color, the wooden doors and other products have obvious characteristics such as corrosion resistance, wear resistance and thick appearance, so they have always been favored by people. However, these precious hardwoods, like other solid woods, are prone to warping and cracking due to the influence of the external environment such as climate. The main cause of wood deformation is the moisture and resin content of the wood itself. They continually expand and contract with changes in temperature and humidity. For this reason, wooden door artisans have been trying to pretreat wood in various ways before the production of the product to reduce the water content and the amount of fat in the wood to stabilize the wood properties. Commonly used treatment methods include blisters, drying methods, and the like. However, based on the special nature of the precious hard wood, the effect is not obvious, and these methods have a long construction period and a large amount of wood wastage. In response to the technical shortcomings of traditional pretreatment, a new method of wood pretreatment has emerged on the market: heating the wood in a special solution to quickly evaporate the moisture in the wood, the solvent in which makes the resin in the wood Dissolved, in which the paraffin wax enters the capillary pores in the middle layer of the wood table at a high temperature state, and is cooled and solidified to be filled in the capillary pores, thereby preventing the external moisture from entering the inside of the wood again, thereby effectively preventing the deformation of the wood. The wood treated by the above process not only contains water, has low fat content, but also has a finer wood surface, which is favorable for lacquering and better preventing mildew and mites. [Follow the WeChat public account "Jiuzhengmen Window Network" to view the latest hot article "You are friends who do the doors and windows, everyone has lived!" More industry exchanges, please join the Jiuzhengmen window network exchange group]
Natural Graphite , as its name implies, is naturally formed by natural Graphite , which is generally found in graphite schist, graphite-gneiss, graphite-bearing schist and metamorphic shale.
Features
The chemical composition of graphite is carbon (C). Naturally produced graphite is rarely pure and often contains impurities, including SiO2, Al2O3, MgO, CaO, P2O5, CuO, V2O5, H2O, S, FeO and H, N, CO2, CH4, NH3, etc. Natural graphite minerals are black, steel gray, striated black; Metallic luster, crypto, dull, opaque; The hardness is isotropic, the vertical cleavage surface is 3 ~ 5, the parallel cleavage surface is 1 ~ 2; Qualitative soft, density is 2.09 ~ 2.23 g/cm3, have the feeling of greasy, easy to contaminate finger. Mineral chip under the transmitted light is generally not transparent, extremely thin can pervious to light, the light green gray, refractive index of 1.93 ~ 2.07, under the reflected light is light gray, reflective pleochroism, Ro gray with brown, Re dark blue gray, reflectivity Ro23 (red), Re5.5 (red), the reflected color, double reflection were significantly, strong heterogeneity, polarization color for straw yellow.
Graphite is a complex six-party double cone, assumes the six-party tabular crystal, common simplex are parallel double, six-party double cone, hexagonal prism, but in good condition with rare crystal forms, the generally show scaly or platy, aggregate density lump, earthy or globular.
Type
The process performance and usage of graphite is mainly depends on the degree of crystallization, in accordance with its natural Graphite Crystal morphology can be divided into crystalline graphite, Flake Graphite ) and aphanitic graphite (earthy graphite) two types of industry.
Crystalline graphite
In the crystalline (scale) graphite ore, the diameter of graphite crystals is greater than 1 mu m. Ore grade is low, but optional; The mineral associated with graphite is usually mica, feldspar, quartz, diopathic stone, diabase, garnet and a small amount of pyrite, calcite, etc., some of which have some useful components, such as rutile and vanadium. The ore is scales, grainy scales or granulocyte structures, flaky, flaky, or blocky structures.
Crystalline (scale) graphite is divided into High Purity Graphite, High Carbon Graphite, Medium Carbon Graphite and low Carbon Graphite according to the fixed carbon content.
The high purity graphite (fixed carbon content is greater than or equal to 99.9%) is mainly used for flexible graphite sealing material, nuclear graphite, instead of platinum crucible for chemical reagent melting and lubricant base material, etc.
High carbon graphite (fixed carbon content 94.0% ~ 99.9%) is mainly used for refractory materials, lubricant substrate, brush raw materials, carbon products, battery raw materials, pencil materials, filling materials and coatings, etc.
Carbon graphite (80% ~ 94% fixed carbon content) is mainly used for crucible, refractories, casting materials, foundry coatings, pencil raw materials, battery materials and dyes, etc.
Low carbon graphite (fixed carbon content 50.0% ~ 80.0%) is mainly used for foundry coatings.
Cryptocrystalline graphite
Cryptocrystalline graphite is also called soil graphite or amorphous graphite. In cryptocrystalline graphite ore, graphite crystals are less than 1 mu m in diameter, which are microcrystalline and can only be seen in the electron microscope. High grade of ore, but poor selectable; The mineral associated with graphite is often quartz and calcite; The ore is microscaly - cryptocrystalline structure, block or soil structure.
Cryptocrystalline graphite ore is mainly distributed in contact metamorphic deposits. Actually the diameter graphite flake graphite ore is uneven, the so-called crystalline graphite ore, may also contain the aphanitic graphite, are too many content is often referred to as the mixed type graphite ore, may also contain a small amount of aphanitic graphite quality mineral crystalline flake graphite piece diameter slightly larger than 1 microns.
Cryptocrystalline graphite ore is mainly used in pencil, battery, electrode, graphite emulsion, graphite bearing ingredients and the raw materials of battery carbon rod. The non-ferrous graphite is mainly used for casting materials, refractory materials, dyes and electrode paste.
Natural Graphite Natural Graphite,Expanded Graphite,Colloidal Graphite,Special Graphite Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com
