The latest forecast from consulting firm AlixPartners is that the chip shortage may cost the global auto industry $110 billion; it will reduce global auto pce powder.
Polycarboxylate superplasticizer is the latest generation of high-performance superplasticizer, which is a series of polymers with specific molecular structure and properties, which are generally obtained by radical polymerization of different monomers.
The structure of polycarboxylate superplasticizer is a comb copolymer with linear main chain connecting multiple branched chains. The hydrophobic molecular main chain contains hydrophilic groups such as carboxylic acid group, sulfonic acid group and amino group, and the side chain is polyoxyethylene with different degrees of polymerization.
Before the emergence of polycarboxylate admixtures, there were lignin sulfonate admixtures, naphthalene sulfonate formaldehyde condensates, melamine formaldehyde condensates, acetone sulfonate formaldehyde condensates, aminosulfonate formaldehyde condensates and so on.
Polycarboxylate superplasticizer was first successfully developed in Japan in the early 1980s.
The new generation of polycarboxylate superplasticizer overcomes some disadvantages of traditional superplasticizer.
Polycarboxylate superplasticizer benefits:
1. Low content: generally, the converted solid content is about 1 to 4 of naphthalene series.
2. High water reduction rate: the water reduction rate of concrete is generally 25% 35%, and the limit value can be as high as 40% 45%.
3. Good slump preservation: the slump loss can be controlled within 2 to 3 hours without loss.
4. The ratio of compressive strength is high: the contrast strength of each age is greatly improved, and the ratio of early compressive strength is significantly improved.
5. Green environmental protection: formaldehyde and other harmful raw materials are not used in the synthetic production process, which will not cause health harm to the human body and pollution to the environment.
6. High durability: the low water-binder ratio caused by high water reduction greatly improves the impermeability, corrosion resistance and chloride ion diffusion transfer coefficient of concrete.
7. Cost saving: because the concrete using polycarboxylate superplasticizer has good workability and low water-binder ratio, and the use of a small amount has a significant effect, it can reduce the cost.
8. Other advantages: excellent working performance, relatively low carbonization, good finish of molded appearance, etc.
A large number of experiments show that the water-reducing effect of polycarboxylate high-performance superplasticizer is highly dependent on its content, and this dependence is greater with the increase of the amount of cementitious materials.
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The drought in Europe is still getting worse. The drought in France is particularly severe. Recently, the French Prime Minister's Office issued a statement saying that the current drought in France is the worst in history. Prime Minister Borne decided to activate an inter-ministerial crisis group to deal with the drought. French Minister for Ecological Transformation Christopher Beshu said that there is no drinking water in pipes in more than 100 towns across France. In addition, Italy also suffered from hot and dry weather, with the highest temperature exceeding 40 ℃ on the 5th local time, and several cities, including the capital Rome, issued a red alert for high temperatures. The country is experiencing its worst drought in more than 220 years.
British officials have released statistics on the sequelae of COVID-19, which has aroused concern. As of July 2, 1.8 million people in the UK were suffering from the symptoms of "long COVID-19", according to a report released by the Office for National Statistics. Among them, 14% of the people were not cured within 12 weeks, and 81% of the people were infected for more than 12 months.
Luoyang Tongrun Nano Technology is a trusted chemical manufacturer and supplier providing high-quality chemicals and Nanomaterials. If you are looking for the pce powder, please feel free to contact us and send an inquiry.
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