Preparation and application of a steel barrel sealant

I. Abstract

This paper mainly introduces a metal storage tank (including steel drums, food packaging cans, etc.) sealant, which is based on natural latex, supplemented by other synthetic latex, with stabilizer, mildew preservative, plasticizer and vulcanizing agent. A one-component water-based sealant made of various surfactants such as an active agent, a dispersing agent, a wetting agent, a thickener, and a pigment filler. The sealant has good elasticity, good adhesion, high tensile strength, solvent resistance, heat resistance and aging resistance, good sealing performance, convenient use and environmental protection. It can be used on packaging drums or on food packaging cans. After verification by many manufacturers, the sealing performance is excellent and the reflection is good.

Second, the outline of steel barrel sealant

The steel barrel sealant described in this paper belongs to the metal sealing material, especially the polymer sealing material used to ensure the high tightness of the storage tank during the metal storage tank manufacturing process.

Metal packaging storage tanks are widely used, ranging from steel drums for industrial liquid raw materials storage and transportation, to cans, cans, food packaging boxes, etc. required for daily life. In the case of can making, the barrel and the cover are subjected to double crimping, and after docking, they are hydraulically wound and sealed. The barrel and the lid of the steel drum are rolled under the hydraulic wheel through 5 or 7 layers. If the quality is qualified, the liquid leakage will not occur even if the sealing material is not used, but the steel drum is packaged, transported and used. Can not avoid collision, once the edge is deformed, it will form tiny pores, causing liquid leakage, which must be avoided for toxic chemical liquid storage and transportation. Moreover, in the process of winding the steel drum, the internal structure is not visible, and the quality inspection is not easy. In order to avoid the above problems, steel drum sealants have been developed at home and abroad to solve the steel drum collision problem to improve the pass rate. A sealant is injected into the groove, and when hydraulically applied, the double bead can be bonded and filled with micropores to seal the barrel. The sealant has certain elasticity and tensile strength after molding. When the steel barrel collides and deforms, it deforms with the deformation of the metal, but does not break, and timely blocks the tiny pores caused by the deformation, and once again seals well. effect.

At present, there are companies producing such sealants in the developed countries such as the United States and Europe, and the brands are various. Among them, the strongest brand of steel drum sealant produced by Grace of the United States has the largest sales volume. There are also many manufacturers of such sealants in China, because the development is relatively late, the scale is relatively small, and the product quality is worse than that of foreign countries. There are many kinds of sealing materials used for packaging steel drums, which are oily and water-based. The application fields are very wide. However, in the steel drum packaging industry, water-based sealants are mainly used, mainly because they are environmentally friendly and non-toxic. Used on food packaging boxes. This paper studies this water-based steel drum sealant.

Third, steel barrel sealant technical requirements

The use of steel barrel sealant mainly includes: 1 manual application; 2 automatic filling of the machine. Manual application is inefficient, and most of the current use of machine automatic filling. The specific construction process: the latex is placed in a hydraulic steel tank, and the compressed air is passed through the pipeline to the glue gun. The latex is evenly poured into the groove on the back of the metal can lid through the glue gun. After drying or hot air drying, a uniform continuous sealing rubber ring is formed, followed by mechanical rolling. The entire process is carried out automatically by the module, and the sizing operation can be carried out continuously and quickly, and the quality is high.

According to the above-mentioned sealant sizing process, the technical requirements of the sealant mainly include:

1. It has good softness and high resilience, and has good tensile strength, ie low modulus and high strength;

2. It has certain adhesion to metal, that is, it must have a certain strength of adhesion;

3, high temperature resistant, heat resistant oxygen aging;

4, high solvent resistance, at least can withstand most common polar, non-polar solvents;

5, the drying time is short;

6. No corrosion or pollution to iron or steel containers;

7, high dimensional stability, that is, the amount of heat shrinkage is small, no cracks after drying;

8, the construction performance is good, to have a certain viscosity, spray glue does not splash, do not block the gun head.

Generally speaking, the viscosity is moderately stable, fast drying, heat and solvent resistance, no corrosion to steel, good adhesion, low modulus and high strength, good dimensional stability, convenient construction and stable storage.

Fourth, the preparation process of steel barrel sealant

This paper mainly develops a special water-based steel barrel sealant by using water-based steel barrel sealant which is widely used by many domestic barrel enterprises and can making enterprises. The preparation of such sealant is very different from the silicone sealant, polyurethane sealant and rubber sealant used in the industry. It is a cross-industry of coatings, adhesives, sealants, latex and other industries. difficult.

The preparation process of the sealant is similar to the paint preparation process, the main process:

1 Inorganic pigment, filler grinding and dispersion

2 auxiliary preparation

3 latex vulcanization pretreatment

4 latex, filler dispersion mixing

5 mixed emulsion thickening and viscosity adjustment, filter discharge packaging

The first step is similar to the coating industry. The following is a detailed description. The third step involves the vulcanization process in the latex industry, thermal vulcanization and natural vulcanization. It needs to be adjusted according to customer needs. It is not described here. You can contact me if necessary.

The sealant described herein is mainly composed of a natural latex, and is added with a stabilizer, a dispersant, a preservative antifungal agent, a vulcanizing agent, an activator, a promoter, a filler, a thickener, a pH adjuster, and an appropriate amount of water. The formula is based on a natural latex dry basis of 100 phr. The specific formula is as follows:

1. Stabilizer: It is also a storage stabilizer, mainly for the protection of colloids, alkalis, surfactants, alkali metal salts. Mainly used are: casein solution, gelatin, bone glue, shellac, and other colloids; potassium hydroxide/sodium, ammonia, organic amine, AMP-90 and other alkalis; flat plus O-20/O-25, polyoxyethylene Surfactant such as propenyl ether, Tween, polyoxyethylene castor oil, polyvinyl alcohol, polyvinylpyrrolidone; castor oil potassium soap, potassium laurate soap, sulfonated castor oil, potassium stearate soap, rosin acid An alkali metal salt such as potassium, potassium lauryl sulfate or sodium dodecylbenzenesulfonate.

2. Vulcanizing agent: sulfur or sulfur compounds. (Sulphur-free vulcanization is not mentioned here) Sulfur-containing compounds mainly include thiuram compounds such as TMTD and TMTT.

3, accelerator: a variety of varieties, mainly used: PZ, BZ, EZ, MZ, M, PX, PIX, TT, D, DP and so on. The vulcanization speed and degree of vulcanization should be adjusted according to customer needs.

4. Active agent: mainly metal oxide and its carbonate. The most commonly used is zinc oxide.

5. Filler: silicon-containing compounds, carbonates, sulfates, metal oxides. Commonly used are: inorganic fillers such as calcium carbonate, talc, kaolin, wollastonite, barium sulfate, diatomaceous earth, and bentonite.

6. Dispersing agent: mainly inorganic dispersing agent, organic dispersing agent, organic dispersing agent, polymer dispersing agent, and the like. Commonly used dispersing agents are: inorganic dispersing agents such as sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, silicate; naphthalene such as triethylhexyl phosphate, sodium lauryl sulfate, dispersant NNO, dispersant MF, etc. Organic dispersant such as sodium sulfonate or sodium dodecylbenzene sulfonate; polyvinyl alcohol, polyacrylamide, sodium polyacrylate, polyurethane dispersant, polycarboxylate, cellulose derivative, guar gum, A polymer dispersant such as a fatty acid polyethylene glycol ester.

7, wetting agent: mainly polymer compounds. Such as polyoxyethylene propylene ether, OP-10, C0-630 and so on.

8, thickener: acrylic, alginic acid, cellulose, starch, such as ASE-60, TT-935, polyurethane thickener, polyvinyl alcohol, polyvinylpyrrolidone, sodium alginate, methylol fiber , CMC, corn starch, sweet potato starch, etc.

9, plasticizer: petroleum, fatty oil systems, such as paraffin emulsion, petroleum resin emulsion, C5 resin emulsion, DOP, alcohol ester 12 and so on.

Only one reference recipe is given below for reference:

Five, product performance and performance

After strict product design and reasonable selection of various additives, the products have been used by many barrel companies and have consistently responded well. Product performance indicators are as follows:

Solid content: 63%

Viscosity: 2300mPa·S

pH: 10.5

Product performance is as follows:

Drying time: 3h (dry at natural temperature (25 °C)) 3min (150 °C hot air heating)

Film elongation at break: 300

Film tensile strength: 12MPa

There is no crack on the surface of the film, no impurity spots and rust spots. The film feels good, the tensile condition is good, the film resilience meets the requirements of foreign countries, and the overall index reaches the level of similar foreign products.

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