Styrene butadiene latex acrylic lotion emulsifying machine

Carboxyl styrene butadiene latex is a copolymer formed by lotion polymerization of butadiene, styrene, a small amount of carboxylic acid and other additives. It is an milky white water dispersion with blue purple luster. Carboxylated styrene butadiene latex has high adhesion and conjunctival strength, good mechanical and chemical stability, good flowability and storage stability, and a large filling amount. Widely used in industries such as papermaking, carpets, textiles, environmental protection of jewelry (charcoal carving and plastic flowers), and building decoration (modified cement mortar, wood glue, modified asphalt, oil field drilling).

The preparation method of carboxylated styrene butadiene latex uses butadiene and styrene as the main monomers for polymerization, supplemented by functional monomers, auxiliary monomers A and B, anionic emulsifiers and nonionic emulsifiers are used in combination, thermal decomposition persulfates such as potassium persulfate aqueous solution or ammonium persulfate aqueous solution are used as initiators, n-dodecanethiol is used as a molecular weight regulator, and electrolytes, chelating agents, and pH buffering agents required for polymerization are used. An environmentally friendly carboxyl styrene butadiene latex for carpet back coating was synthesized by intermittent batch feeding or dropwise feeding, and vacuum flash evaporation degassing.

A preparation method of carboxyl styrene butadiene latex of the present invention,
Raw materials: Calculated by mass, including: 100 parts of polymer monomer, 0 5-1. 8 parts emulsifier, 50-80 parts deionized water, 0 3-0. 9 molecular weight modulators, 0 3-1. 4 initiators;

Including the following steps:

1: Under vacuum conditions, add 60-90% deionized water, 25-40% emulsifier, molecular weight modifier, and polymerization monomer other than C4 aliphatic conjugated diene into the reaction vessel. Replace the air in the reaction vessel with N2 and press 5-20% of C4 aliphatic conjugated diene into the reaction vessel with N2;

2: Introduce steam into the reaction vessel to raise the temperature to 65-75 ° C, and then add 25-30% initiator;

3: Continuously introduce steam and raise the temperature to 75-85 ° C. When the conversion rate reaches 60-90%, add the remaining polymerization monomers, deionized water, emulsifiers, initiators, and molecular weight regulators;

4: Keep the temperature inside the reaction vessel at 80-90 ° C and keep it warm When the conversion rate reaches over 98% within 5-4h, adjust the pH value of the latex to 7-8 with a pH regulator;

5: Transfer the substances in the reaction vessel into a degassing vessel for degassing. After degassing is complete, press the substances in the degassing vessel into a mixing batch container. After the temperature drops to 30-50 ° C, pack and discharge to obtain carboxyl styrene butadiene latex.

High speed shear homogenizer is mainly used to process a large number of ultra-fine suspended lotion. Due to the simultaneous use of three homogeneous heads (rotor and stator) for processing, a very narrow particle size distribution can be obtained, resulting in smaller droplets and particles, and thus better stability of the generated mixture. The dispersing head is easy to replace and suitable for various applications. Different machines have the same rotational speed and shear rate, which facilitates scale expansion. Compliant with CIP and SIP cleaning standards, it is particularly suitable for food and pharmaceutical production.

The emulsifier adopts a German Bergmann double end mechanical seal, which can operate continuously for 24 hours while ensuring cooling water. However, it is difficult for ordinary emulsifiers to operate continuously for a long time, and ordinary emulsifiers cannot withstand high-speed operation. It can handle a large amount, operate more smoothly, and is more convenient to disassemble and assemble. It is suitable for industrial online continuous production, with a narrow particle size distribution range, good dispersion effect, and no dead corners. The material * * * is cut through dispersion.

The three-stage high shear dispersion machine is mainly used for the production of micro lotion and ultra-fine suspension lotion. Since three groups of dispersion heads (stator+rotor) in the working chamber work at the same time, after high shearing, the lotion drops are more delicate and the particle size distribution is narrower, so the stability of the generated mixed liquid is better. The three sets of dispersing heads are easy to replace and suitable for different process applications. The different models of machines in this series have the same line speed and shear rate, making it very easy to scale up production. It also meets the CIP/SIP cleaning standards and is suitable for food and pharmaceutical production.

High rotational speed and shear rate are important for obtaining ultrafine suspension lotion. According to some industry specific requirements, its shear rate can exceed 15000rpm, and the rotor speed can reach 44m/s. Within this speed range, turbulence caused by shear forces combined with specially developed motors can reduce the particle size range to the nanometer level. The shear force is stronger, and the particle size distribution of lotion is narrower.

The following is a model table for reference:

Styrene butadiene latex acrylic lotion emulsifying machine