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Epoxy floor coating coatings have excellent adhesion mainly determined by the molecular structure of the epoxy resin and its curing reaction characteristics.
Epoxy resin flooring epoxy resin in the molecular structure of epoxy terminal groups, base groups and ether bonds and other polar groups, the presence of these groups so that the epoxy resin molecules and adjacent interfaces to produce electromagnetic adsorption or chemical bond Therefore, the coating of epoxy floor paint can produce strong adhesion to the surface of metal, wood, concrete and other substrates.
Epoxy floor paints produce lower internal stress in cross-linked and cured films: During the film formation process of epoxy floor paints, many factors can cause the coating film stress of the floor paint to cause coating. The final defects of the film, especially the reduction of the adhesion of the coating film to the substrate. Epoxy resin molecules contain secondary light bases, and some bases are derived from curing. Hydrogen bonds are formed between the light bases and the epoxy molecules are arranged closely. Therefore, the epoxy resin has less difference in density before and after curing. , And the epoxy resin curing reaction is mainly a gradual ring-opening addition polymerization reaction, in the reaction there is no formation of small molecule by-products, so the curing shrinkage of epoxy resin is very low, so the epoxy resin coating is cured in the film It has little effect on the adhesion between the coating/interface.
Moreover, the backbone of bisphenol A epoxy resin contains many ether bonds. The ether bond and carbon-carbon bond make the epoxy macromolecular chain have a certain flexibility, which facilitates the rotation of the molecular chain and eliminates some of the internal stress.
Epoxy mortar floor specific practices and requirements
Undercoat
1. Use solvent-based epoxy one-component primer or solvent-free epoxy primer (main paint: curing agent = 5:1) to mix and stir;
2. Brush evenly with rollers and brushes without any paint leakage.
0.15-0.20Kg/m2
Coated mortar
1. Use solvent-based epoxy midcoat (1:1) or solvent-free epoxy midcoat (5:1) to mix and add appropriate amount of 40- to 100-mesh quartz sand to mix well;
2. With a batch knife full scrape 1 to 2 times;
3. After curing, grind and remove defects such as knife marks and clean them.
0.7kg/m2/mm
Putty layer
1. Use solvent-based epoxy midcoat (1:1) or solvent-free epoxy midcoat (5:1) to mix and add appropriate amount of filler (such as quartz powder and talcum powder) and mix well;
2. Approved with a batch knife 1 to 2 times, focusing on filling holes in the ground;
3. After curing, grind the defects such as knife mark, and clean it with a vacuum cleaner, chicken feather zen, wrung wet towel and so on.
0.2-0.30 kg/m2
Top coat
1. Use a solvent-based epoxy topcoat (1:1) or a solvent-free epoxy topcoat (5:1) to mix in proportion and stir evenly.
2. Dip the top coat with the prepared roller and roll it evenly. The coating is required to be even and no leakage is applied.
0.25-0.30 kg/m2
Wear layer
1. This process can be selected and used according to the user's needs;
2. Solvent-based Epoxy Floor Paint Topcoat After 12 to 24 hours of construction, curing to a pedestrian without leaving any traces, it will be coated with epoxy wear-resistant topcoat, which will greatly improve floor finish and durability.
0.12 kg/m2
Matters concerning the export of Graphite
Over the years, China has been the most * big exporter of Natural Graphite products, in deep processing of graphite products technology leading developed countries, is against the natural graphite "with purchase and adopt a generation of" strategy, and technology blockade, natural graphite as a kind of non-renewable resources, with very good foreground countries limit zhi, its export of primary products, such as export carbon rods, artificial graphite, Graphite Block, pre-baked anode, etc., need to be dealt with the dual-use items.
The price of natural Graphite Powder is determined by three main factors: carbon content, moisture and particle size distribution.
1. The higher the carbon content, the greater the purity of graphite, so the price will rise in the form of the acceleration line (i.e., the higher the purity, the more complex the production process, and the higher the price increases).
The larger the scale, the lower the natural content and the higher the price. Conversely, the smaller the particulate matter, the less content in nature and the higher the price. Therefore, for natural graphite, the price of the normal (i.e., the material at the top of the sieve) is high. In the positive eye, the smaller the number, the bigger the scale and the higher the price. In negative eyes, the larger the number, the smaller the scales, the higher the price, the lower the price of negative items.
Artificial graphite HS codes for 3801100090, customs supervision conditions for export license of dual-use items and technologies, when customs clearance in addition to submit normal trade documents, and shall be submitted to the ministry of commerce issued "export license of dual-use items and technologies".
Materials for application of electronic key for dual-use items:
1. Application of electronic key for approval and approval (seal of enterprise official seal and approval seal)
2. Copy of business license (seal of enterprise)
3. Photocopy of the record registration form of foreign trade operator or a copy of the approval certificate of the foreign-invested enterprise (with the official seal of the enterprise)
4. Applicant's identity card and copy of the company's legal person identity card (seal enterprise seal)
5. Service contract (please refer to the representative office or office)
6. Copy of bank payment receipt (wire transfer voucher, bill)
Information on import and export of dual-use items
1. Trade contract
2. Export (import) packing list
3. Certificate of final user and end-use abroad
Application for export license of sensitive items and technologies of the People's Republic of China, etc.
Graphite Export Packing,Graphite Packaging,Graphite Block Packaging,Graphite Powder Packaging
Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com