Acid and alkali resistant adhesives
1. Use The acid-base adhesive composed of lead oxide, glycerin, barium sulfate, asbestos powder, and sodium silicate is mainly used for bonding glass, porcelain, and metal. More bonding used in chemical equipment. The agent is characterized by being free from the influence of acid or alkali. 2. Raw materials (1) Lead Oxide: Also known as Huang Dan, Li Tuo. Yellow to yellowish red, tetragonal or orthorhombic. poisonous. Insoluble in water and ethanol, soluble in nitric acid, acetic acid or warm alkali solution. Used as a pigment, metallurgical flux, paint drier and so on. Used as a filler in this agent. Use industrial products. (2) Glycerol: Also known as glycerin. Colorless, odorless, weakly sweet, viscous liquid. It can be miscible with water in any proportion and can reduce the freezing point of water. Has great hygroscopicity. Slightly soluble in ether and ethanol. This agent is used as a solvent. Use industrial products. (3) Barium sulfate: white orthorhombic crystals. Hard to dissolve in water and acid. Used as fillers for white pigments, paper and rubber. This agent is used as a filler. Use industrial products. (4) Asbestos powder: A general term for fibrous magnesium, iron, calcium, and sodium silicate minerals. Yellow green or white. Split into flocculent white. Fiber is flexible. Chemically inactive. With acid, alkali and heat resistance. For asbestos cement products, asbestos insulation materials and insulation materials. This agent is used as an adhesion aid and filler. This agent is used as a filler. Use industrial products. (5) Sand: ordinary fine sand. (6) Sodium silicate: Also known as liquid water glass or sodium silicate silicate. Formula XNa2O·YSiO2. Colorless or greenish glassy solid or viscous liquid. Widely used in anti-corrosion, paper making, soap making and textile industries. This agent is used as a binder. Use industrial products. 3. Formula The formulation of this agent is shown in Table 5-1. Table 5-1 Weight of acid and alkali adhesive formulations Numbering raw material Formula 1 Formula 2 Recipe 3 Lead oxide word 100 - - glycerin 25 - - Barium sulfate - 1.0 1.0 Asbestos powder - 3.0 1.0 sand - 1.0 1.0 Sodium silicate - 3.0 2.0 4. Preparation and use methods Formulation 1 Preparation: First, the lead monoxide was ground into a fine powder, and then it was placed on an old iron plate and heated to 300° C. for a few minutes. After cooling, it was mixed with glycerol and used with it. Preparation of Formulations 2 and 3: First, the sulphite is crushed into fine powder using moromi and sand, mixed with asbestos powder, and placed on an iron plate and heated to about 300°C for several minutes. After cooling, it is mixed with sodium silicate and mixed. to make. Before the agent is used, the surface of the adhered object should be washed and dried, and then beaten with a hair-trimming machine. Then glue the surface of the two adherends. After slightly drying, the two adherends were stuck together and pressed with a weight. The agent should be used with the distribution. Travel Bag,Overnight Bag Women,Travelers Backpack,Small Travel Bag Ningbo Happiness Stationery Industrial & Trading Co Ltd , https://www.bagshappiness.com
Source: 21st Century Fine Chemicals Network