Carboxylated Styrene Butadiene Rubber Latex (XSBR)
XSBR is the abbreviation of Carboxylated Butadiene Styrene Rubber Latex , In simple language by adding acrylic acids to styrene monomer along with Butadiene gas and some other additives would create the XSBR latex , The Styrene has the role of strength increasing and butadiene has dedicated impactability to this copolymer.
MORE : What is styrene monomer?
MORE : What is butadiene gas?
Styrene Butadiene Latex (SB)
The styrene-butadiene copolymer or SB LATEX is formed by the polymerization reaction of an emulsion of styrene and butadiene monomers. The percentage composition of the two main substances styrene butadiene has a significant effect on the physical properties of the final product.
SB emulsion is used to apply paths, special coatings, adhesives and non-woven fabrics. Adding styrene butadiene (SB latex) makes the paper smoother, firmer, glossier, brighter, more water resistant and more wrinkled.
Used for running tracks, specialty coatings, adhesives, and non-woven fabrics
Styrene Butadiene Rubber (SBR)
Styrene butadiene rubber is actually the same as styrene butadiene latex, but the percentage composition of the two main materials styrene butadiene is different. For example, the higher the percentage of butadiene, will cause more rubbery features, and the higher rate of styrene, would cause drier features too.
One of the stable emulsions is synthetic Styrene Butadiene Rubber (SBR) with longer life-time and more heat resistance, which is replaced instead of natural rubber after World War II. Today, SBR emulsion is one of the most widely used types of polymers in various industries, especially tire and rubber, tubes, rubber coatings, and hoses.
The difference between SBR and XSBR
With simple explanation, Carboxylating of SBR Latex by acrylic acids produces XSBR or X-SBR. Latex XSBR has improved properties compared to SBR base types and is marketed as white water based emulsion. Literally, they are not much different, but with the variety and recipe of Carboxylated Styrene Butadiene preparation with different additives, each output product has its own characteristics and is used in different industries for different applications, which we will talk about in detail in the following articles.
Latex XSBR production process (Carboxylated Styrene Butadiene)
Latex X-SBR is a product of the polymerization process of styrene and butadiene monomers and other additives in which 4 important factors are involved, which are included of:
- Raw materials or feed (monomers) including monomers of styrene, butadiene gas and type and concentration of initiator (potassium persulfate) and emulsifier (sodium lauryl sulfate) and other materials affect the physical characteristics of the final product and the speed of the production process.
- Recipe and preparation order (Recipe) the ratio of the amount of raw materials that has a significant impact on the physical characteristics of the product.
- Reactor space: A space for injecting materials and the amount of cutting materials by the mixer, which has a high effect on the reaction speed of the mixer, will also provide tangible effects on the final properties of the generated latex.
- Controlling the temperature of the reaction medium (Temperature): Temperature changes have many effects on the process. Changes in the reaction temperature, ie the polymerization temperature (more effective than other variables) cause changes in the process speed so that in some cases The reaction will vary by more than 50%.
In the preparation of latex polymers by emulsion method, in addition to the above, other factors such as the strategy of injecting materials into the reactor, which can be batch, semi-batch, continuous, which has a noticeable effect on the physical characteristics of the product and film formation.
If we want to explain more about batch, semi-batch, we can say that all kinds of raw materials such as emulsifiers used in polymerization can be injected at the beginning of polymerization or after polymerization, the product is taken out of the reactor, which is called batch or can be Then the reaction is gradually added and at the end the product is taken out of the reactor, which is called semi-batch, or the material can be injected continuously and the product is removed on the other side, which is called continuous method.
Another factor to consider when making a product is its acidity, as this pH greatly affects the physical properties of latex. In addition to the pH value, viscosity, surface tension, mechanical stability, color, odor and film construction are considered.
Advantages and disadvantages of Carboxylated Styrene Butadiene Latex (X-SBR Latex)
Its production cost is much cheaper than some similar materials used in some industries, high resistance to water, acid and alcohol compared to SBR materials. Low resistance to ignition, gasoline and hydrocarbon solvents. It also has excellent corrosion resistance, good buoyancy, low temperature flexibility, cracking resistance, heat resistance and impact resistance of latex XSBR (Carboxylated Styrene Butadiene) properties.
Applications of Carboxylated Styrene Butadiene Latex (X-SBR) in various industries
- carpet and rug finishing
- the construction and concreting industry
- the pulp (cellulose) industry
- industrial coatings and gloves
- padding and strobe industry
- artificial turf industry
- the industry of polymer composites and compounds