Why do you need to do a composition analysis of rubber?

Problems that need to be addressed:

1.The ability to resist cold and heat changes is weak, and it is easy to produce cracks after being subjected to cold and heat impact, and the moisture resistance is poor.

2.The vulcanization rate is slow and the service life is short.

3.Tightness: Poor resilience, seal failure, easy frost cracking, insufficient conductivity, etc.

4.Improve the specific active ingredients in the formula, improve the special or comprehensive performance of the product, develop R&D ideas, and shorten the R&D cycle.

On the one hand, the analysis of rubber composition has the role of quality inspection, and on the other hand, artificial rubber can be realized.

The main purpose of doing rubber composition analysis is to ensure that the rubber can meet its quality requirements, because the standard national standard for rubber has requirements for the content of some harmful substances and so on.

Rubber composition analysis helps to identify the type of rubber, and different rubber has different physical properties, which is helpful for use in production.

Advantages of rubber composition analysis:

Rubber is a highly elastic polymer compound. It has a high elasticity that other materials do not have, so it is also called an elastomer. The main characteristic of rubber is that it has a large molecular weight, generally in the hundreds of thousands, or even in the millions; The second is that rubber is polydispersed, that is, the molecules of rubber are unequal in size and have a distribution range, which is the internal reason why rubber becomes an engineering material.

1) Qualitative analysis obtains the main components of the analyte by means of component analysis, and in general, it is to determine the composition of the substance.

2) Quantitative analysisAfter determining the qualitative components of the analyte, the corresponding quantitative analysis is carried out to obtain the distribution ratio of various components. According to science and technology, quantitative analysis can only be infinitely close to the real situation, but it cannot be 100% accurate.

3) Qualitative and quantitative analysis to determine the composition of the analyte and the proportion of each component substance.

4) Qualitative semi-quantitative analysis can basically determine the composition of the analyte, and there is also a certain reference value in quantification, but its value is not accurate.

The details are as follows:

Natural rubber is made from latex, and some of the non-rubber components contained in the latex remain in the solid natural rubber. Generally, natural rubber contains 92%-95% of rubber hydrocarbons, while non-rubber hydrocarbons account for 5%-8%. Due to different manufacturing methods, different origins and even different rubber picking seasons, the proportion of these ingredients may be different, but basically within the range.

Protein can promote the vulcanization of rubber and delay aging. On the other hand, protein has strong water absorption, which can cause moisture absorption and mildew of rubber, decreased insulation, and protein also has the disadvantage of increasing thermogenesis.

Acetone extract is a number of high-grade fatty acids and sterols, some of which act as natural antioxidants and accelerators, and some can help the powdered compounding agent disperse and soften the raw rubber during the mixing process.

The ash mainly contains salts such as magnesium phosphate and calcium phosphate, and there are very small amounts of metal compounds such as copper, manganese, iron, etc., because these valence metal ions can promote the aging of rubber, so their content should be controlled.

The moisture in the dry rubber does not exceed 1%, and it can be volatilized during processing, but when the moisture content is too much, it will not only make the raw rubber easy to mold during storage, but also affect the processing of rubber, such as the compounding agent is easy to agglomerate during mixing; It is easy to produce bubbles in the process of calendering and extrusion, and bubbles or sponges are produced in the process of vulcanization.

In terms of rubber composition analysis:

Component analysis, formula analysis, component testing, material identification, qualitative and quantitative analysis, rubber grade identification.

Rubber testing items:

Vulcanization Properties, Mooney Viscosity, Mooney Coke, Giman Test, Plasticity, Density, Swelling, Volatile, Ash, Solids, pH, Hardness, Tensile Strength, Elongation at Break, Hot Air Aging, Liquid Resistance, Drum Abrasion, Akron, Compression Deformation*, Resilience, Resistivity, Oxygen Index, Vertical and Horizontal Combustion, Compressive Strength, Young's Modulus, Salt Spray Test, Artificial Weather Aging, Ash, Brittle Temperature, Thermal Conductivity, Dielectric Strength, Dielectric Constant, Loss Angular Tangent, Withstand Voltage, Leakage current, tracking index, tracking resistance.

Silicone rubber formula analysis is synthesized by the main component silicone rubber and additives such as reinforcing agents, vulcanizing agents, and structural control agents. Reinforcing agent: Compounding agent that can improve the wear resistance and tear resistance or tensile strength of vulcanized rubber, there are two kinds of reinforcing filler and reinforcing resin, reinforcing filler has fine particle carbon black, white carbon black silicate, etc., and reinforcing resin has high styrene resin, phenolic resin, etc.

Silicone rubber formulation analysis characteristicsStructure control agent is an additive designed to eliminate the structuring phenomenon of silicone rubber silica system, which is composed of chaotic mobile phone silicon compounds with active groups, and the anti-structuring function is attributed to the eugenics of the active groups and the hydroxyl group interaction on the surface of silica, so that it is passivated to achieve the purpose of anti-structuring, and the main varieties include hydroxysilane-containing compounds such as hydroxysilicone oil diphenylsilicondiol.

Alkoxysiloxanes such as alkoxy low molecular weight polysiloxanes, silamine compounds such as hexamethyldisilavan, cyclic trisilavanes, etc. and boron-containing siloxane compounds, vulcanizing agents are substances that can make rubber molecular chains cross-link, make linear molecules form a three-dimensional network structure, reduce plasticity, and increase elasticity.

Are you talking about plain raw rubber, or already mixed rubber?

The composition of raw rubber is relatively simple, like natural rubber is about 93% rubber hydrocarbons (cis polyisoprene), and the rest is protein, organic acids, ash, impurities (sand, sawdust, etc.) and other non-rubber substances;

Synthetic rubber, such as styrene-butadiene rubber, is mainly a copolymer of butadiene and styrene. Among them, according to the use, the mass percentage of styrene is, and the number of filling oil is different, 25% and 40% are available, mainly due to different processability.

If you are talking about the composition of rubber compounds, it is the analysis of rubber formulas, which is more complicated, such as Tongcheng Chemical in China, claiming that their analysis degree has reached 99%, that is, what is used in the formula, the dosage, they can know 99% (I think it is bragging), but it should be possible to know most of the ingredients, you can try, but it is not cheap!

Microspectrum Technology specializes in rubber composition analysis, formula testing, and performance testing, helping to understand the composition of rubber products, solving product performance failures, developing new product formulas, and reducing production costs.

Our company's service scope covers EPDM rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, natural rubber and other rubber types, analyzes and reduces the thermoelastomer formulations such as sealing rings, hoses, O-rings, gaskets, conveyor belts, TPU, etc., improves the low temperature and high temperature resistance and anti-aging performance of rubber through analysis, solves the problems of rubber frosting, scorching, sticking rollers, and long vulcanization time, and provides technical support and solutions.

Principle of rubber composition analysis: The structure of rubber polymer spectrum and peak height are single, invariant and detectable. After the rubber samples are separated and extracted, they go through five steps: sample evaluation, pretreatment, instrument testing, spectrum analysis, and reverse reduction, and comprehensively use more than 10 sets of instruments of various sizes such as thermal cracking, IR infrared, NMR nuclear magnetic resonance, XRD XRF, thermogravimetric analysis TGA, DSC, SCANNING ELECTRON microscope, etc., to ensure accurate and reliable analysis results, and restore the initial formula and raw material composition.

Three advantages of microspectral analysis;

1. IR infrared, NMR, mass spectrometry, XRD XRF are used in combination, and the analysis accuracy is high;

2. Microspectrum Technology has an analysis team from Tongji University in China, with CMA testing qualifications and excellent technology;

3. Shanghai Weipu has the most detailed spectrum resources, and the detection of halogen-free flame retardant components is leading the industry.

Features of Rubber Composition Analysis:

The role of rubber formulation analysis:

1. Understand the composition of rubber raw materials and choose the best supplier.

2. Shorten the R&D cycle, improve efficiency, and keep up with the direction of the industry.

3. Solve product problems and reduce production costs.

4. Technological innovation, assist in the development of new product formulas, and lead competitors.

The backbone of the linear polymer chain has an unsaturated double bond that can be opened in the presence of oxygen and sulfur, forming cross-links between adjacent bonds. It cures into a thermosetting polymer TS. Homeopathic polybutadiene monomers can be opened.

Rubber: Main glue: zinc oxide stearyl ester, antioxidant, accelerator, sulfur carbon black, magnesium oxide, carbon black specific surface area.