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? ? 覆膜砂是在砂粒表面在造型前即覆有一層固體樹脂膜的型砂或芯砂。有冷法和熱發兩種覆膜工藝：冷法用乙醇將樹脂溶解，并在混砂過程中加入烏洛托品，使二者包覆在砂粒表面，乙醇揮發，得覆膜砂；熱法把砂預熱到一定溫度，加樹脂使其熔融，攪拌使樹脂包覆在砂粒表面，加烏洛托品水溶液及潤滑劑，冷卻、破碎、篩分得覆膜砂。
? ? 覆膜砂是一種采用優質精選天然砂為砂基，經過水洗、脫泥、表面處理等特殊性能的樹脂覆膜系統及.理想的工藝技術，根據不同用戶的技術需求，力求在常溫性能、潰散性、流動性、鑄件表面粗糙度等方面.完美的結合，覆膜砂顆粒較圓整、粒度均勻，透氣性好、緊實度高。廣泛用于鑄鋼件、鑄鐵件等鑄造行業用砂。
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? ???普通類覆膜砂 由石英砂、熱塑性酚醛樹脂、烏洛托品和硬脂酸鈣組成，不加有關添加劑。適用于生產一般鑄鐵件。
? ???高強度低發氣類覆膜砂 是普通覆膜砂的更新換代產品，通過加入有關添加劑和采用新工藝配制而成，其強度比普通覆膜砂高30以上，發氣量也明顯降低，適用于生產復雜精密鑄鐵件。
? ???高溫類覆膜砂 在高溫下具有強度高、耐熱時間長的特性，適用于生產汽車發動機缸體、缸蓋、集裝箱角等復雜薄壁鑄鐵件。
? ???易潰散類覆膜砂 具有較好的強度，同時具有**的低溫潰散性能，適用于生產有色金屬鑄件。
? ???其它特殊要求覆膜砂 為適應不同產品的需要，開發出了系列特種覆膜砂如：離心鑄造用覆膜砂、激冷覆膜砂、濕態覆膜砂、防粘砂、防脈紋、防橘皮覆膜砂等。?
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? ???振動清砂、高強度、低發氣、低膨脹、抗變形。
? ???易潰散，潰散性好、鑄件表面光潔度高。
? ???殼型不起層、熱穩定性好、導熱性好、流動性好、鑄件表面平整。
? ???高強度、耐高溫、低膨脹、脫模性好、抗粘砂性好。
? ???殼層均勻、固化速度快。
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? ??運輸與裝卸：在運輸過程中，不得用鐵鉤拖拽，應防止與堅硬物質混裝，不可強烈振動、磨擦、踩、 砸，嚴禁拋擲，應輕裝輕卸，以減少包裝破碎，影響使用。
? ??儲存：應儲存于陰涼干燥處，防止內外包裝袋破裂，防止受潮和吸附空氣中其它物質，影響使用效果。嚴禁與有毒有害氣體或易揮發物質混放，存放要遠離污染源。
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? 單位名稱：鞏義市大昌耐火材料有限公司
? 單位地址：中國 河南 鞏義市 建設路209號
??銷售經理：焦艷潔
??電 ? ?話：
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??Q ?????Q：244****242
??郵 ???箱：244****242@qq.com
??公司主頁：
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The coated sand in the sand surface is in the shape of the front is covered with a layer of solid resin sand or sand core. Have two film covering technology: cold method with ethanol to dissolve the resin for cold and heat, and in the mixed sand adding Urotropine, the second is coated on the surface of the sand, the evaporation of ethanol, coated sand; thermal method to sand preheated to a certain temperature, and resin to melt, mixing the resin is coated on the surface of the sand, and Urotropine solution and lubricant, cooling, crushing and sieving of coated sand.
Resin coated sand is a sand foundation with high-quality selection of natural sand, after washing with water, removal of mud, surface treatment and other special properties of resin coated system and the ideal technology, according to the technical requirements of the different users, and strive to in properties at room temperature, collapsibility, liquidity, casting surface rough degree of the perfect combination, the coated sand particles was round in whole, uniform particle size, permeability, compaction. Widely used in cast steel, cast iron castings and other industries with sand.
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? ?The general category of precoated sand by quartz sand, thermal plastic modified phenolic resin, urotropine and calcium stearate, without additives. Applicable to the production of general cast iron parts.
? ?High strength low gas coated sand is ordinary coated sand replacement products, by the addition of additives and the new process preparation, the strength of more than 30 higher than in ordinary coated sand, volume is greatly reduced, and the applicable to the production of complex precision cast iron.
? ?To a high temperature type resin coated sand at high temperature with characteristics of high strength, heat resistance for a long time, applicable to the production of automotive engine cylinder block, cylinder head, container angle complex thin wall castings.
? ?Easy collapsibility class coated sand has high strength, and has excellent low temperature collapsibility, suitable for the production of non-ferrous metal castings.
? ?Other special requirements of coated sand in order to meet the needs of different products developed series of precoated sand such as centrifugal casting precoated sand, chilled precoated sand, wet state of precoated sand, anti sticking sand, anti veining, anti cellulite coated sand.
? ?Vibration cleaning, high strength, low gas, low expansion, anti deformation.
? ?Easy collapsibility, good collapsibility, high surface roughness of castings.
? ?Shell type is not up, good thermal stability, good thermal conductivity, good mobility, surface roughness of castings.
? ?High strength, high temperature resistance, low expansion, good mold release, good resistance to sand.
? ?The shell is uniform, fast curing speed.
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Transport and handling: in the transport process, not drag hook, should prevent mixed with the solid material, strong vibration, friction, hit, hit, forbid throwing should be lightly armed light discharge, to reduce the breakage of packing, the impact of the use.
Storage: should be stored in a cool and dry place, to prevent internal and external packaging bag break, prevent moisture and adsorption of other substances in the air, affect the use effect. It is strictly prohibited to mix with poisonous and harmful gas or volatile matter, and keep away from the source of pollution.
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? 單位名稱：鞏義市大昌耐火材料有限公司
??單位地址：中國 河南 鞏義市 建設路209號
??銷售經理：焦艷潔
??電 ? ?話：
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??Q ?????Q：244****242
??郵 ???箱：244****242@qq.com
??公司主頁：
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? ?Company name:Gongyi Dachang Refractories Co.Ltd.
? ?Company address:Jianshe Road?209?building, Gongyi Henan , China
? ?Sales manager:Yanjie?Jiao
? ?Telephone: 86?0371?63236299
? ?Mobile phone:
? ?244****242
? ?E-mail：244****242@qq.com
? ?Company web：
中國耐火材料網
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