Filling modification of the hottest BaSO4 in gener

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Filling modification of BaSO4 in general plastics

1. Filling modification of BaSO4 in general plastics

general plastics has the advantages of good formability and low price, but its disadvantages such as easy aging and deformation bring a lot of inconvenience to use. In order to overcome these shortcomings, it can be improved by modifying and adding additives to meet the needs of its practical application. The application of BaSO4 in general plastics is one of the research hotspots in recent years. Yan Hanbo [2] and others applied the uniform design method to prepare high gloss polypropylene (PP) composites with ultrafine modified BaSO4 and nucleating agent. The properties of the product such as tensile strength, bending strength, bending modulus and cantilever impact strength were investigated. The results showed that the content of the agent was 2.0 ‰, and the filling amount of modified ultra-fine BaSO4 was 28.0%. Compared with the imported similar products, the properties of the high gloss PP tensile were equivalent. Xu Yan [3] and others prepared polyvinyl chloride (PVC)/Methyl Methacrylate Butadiene Styrene Copolymer (MBS)/nano barite (nano BaSO4) ternary composites by melt blending method, and investigated their mechanical properties and thermal stability. The results showed that MBS and nano BaSO4 could synergistically toughen PVC; When the contents of MBS and nano BaSO4 are 10% and 1% respectively, the toughness and rigidity of the material can be improved at the same time, and its impact section shows typical ductile fracture characteristics; Thermogravimetric analysis shows that adding 1% nano back door and tail brace pressure testing machine technology introduction BaSO4 can significantly improve the thermal stability of PVC/MBS. Yang Liu [4] et al. Used the method of wet reaction modification to embed long carbon chain molecules of stearic acid on the surface of barium sulfate in the precipitation reaction stage, so that the surface of barium sulfate changed from hydrophilic to lipophilic. Thus, the dispersion of barium sulfate in polyvinyl alcohol solution is improved, and the mechanical properties of PP can be improved by using it as the filler of PP

2. Filling and modification of BaSO4 in engineering plastics

with the importance of modern science and technology, the simplest and most useful way to avoid the rust of hydraulic molding machine is to apply anti-oxidation paint to the press machine. With the increasing progress, the society puts forward extensive and multifunctional requirements for engineering plastics. For example, engineering plastics should have good toughness and hardness; It should have good rigidity and excellent impact strength; It should have good comprehensive performance and low price. For various requirements, a single resin is difficult to meet the requirements of diversification and high quality, and plastic modification can turn this limited single resin into a new multifunctional material, so as to meet the needs of different fields. There are many methods to modify engineering plastics, such as blending modification, filling modification and so on. Among them, filling modification is the most commonly used method by enterprises, not only because it endows plastics with new functions (such as aging resistance, conductivity, heat resistance, etc.) and new properties (improving mechanical properties such as impact strength, tensile strength, elastic modulus, etc.) through filling modification, but also because it can reduce product costs and enhance market competitiveness on the premise of ensuring quality

Feng Jiachun et al. Studied the aging properties of ABS/BaSO4 system and the effects of stearic acid, titanate coupling agent, rare earth coupling agent and other treatment agents on the aging properties of the system by using natural exposure and thermal oven aging experiments. The experimental results show that the addition of BaSO4 can block the photooxidation and thermal oxygen aging process of ABS system and improve the aging resistance of ABS. Shi Jianjiang et al. Studied the morphological structure and mechanical properties of polyamide 66 (PA66)/barium sulfate composites, and discussed the effect of surface treatment of barium sulfate on the mechanical properties of the composites. The results showed that in the 20% (mass fraction, the same below) activated barium sulfate and 5% ethylene octyl copolymer melt grafted maleic anhydride blend modified PA66 composite system, a small part of barium sulfate had the effect of heterogeneous nucleation on PA66, and most of barium sulfate had the effect of toughening PA66. Compared with the unactivated barium sulfate, the tensile strength of the material is increased by 10MPa, the bending strength is increased by 11mpa, and the notch impact strength of the simply supported beam is increased by 9kj/m2

3. Filling modification of BaSO4 in special plastics

compared with general engineering plastics, special plastics have better and unique properties, such as high strength and high cushioning. However, some special plastics have poor creep resistance and poor thermal conductivity, which limits their scope of application

therefore, researchers at home and abroad have carried out a lot of modification research on special plastics with poor performance, in order to expand its application in cutting-edge technology fields such as the ocean, the universe and the atomic energy industry. Among many modification methods, filling modification method is widely used because of its simple process and good effect

Ding Meiping prepared baso4/ptfe composites by combining cold press molding and sintering curing. Many experts believed that the influence of different dosage and particle size of barium sulfate filled PTFE composites was studied. The results show that the amount and particle size of BaSO4 filler have a great influence on the properties of the composite. When the particle size of BaSO4 filler is 44 μ m. When the mass fraction is 40%, the wear resistance of the composite is the best, which is 2 orders of magnitude higher than that of unmodified PTFE SEM analysis of the wear surface of the composite shows that with the increase of BaSO4 dosage, the wear machine of the composite gradually changes from adhesive wear to abrasive wear, accompanied by fatigue. In 2004, the first domestic aerogel gel enterprise was established and achieved the pilot test of aerogel gel powder in 2006. Chen Xiangrong [8] et al. Studied the effects of BaSO4 dosage, planting load and grinding time on the friction and wear properties of Polytetrafluoroethylene Composites under dry friction conditions. It is found that there is an optimal content of wear resistance; With the increase of planting load, the friction coefficient, wear amount and scar width of the material also increase; The wear amount fluctuates less and tends to be stable with the extension of time. The addition of BaSO4 increases the friction coefficient of PTFE/BaSO4, but greatly improves the wear resistance of the material. When the content of BaSO4 is 23%, the wear resistance of the material is the best

4, filling and modification of BaSO4 in other polymers

the application of barium sulfate in other polymers has also attracted much attention in recent years. Zhang Ying and others used polyacrylamide (PAM) polymer micro gel as a template, combined with reverse micelle method to prepare barium sulfate polyacrylamide (baso4-pam) inorganic polymer composite microspheres. The results show that the deposition amount of BaSO4 and the deposition reaction rate have significant effects on the surface morphology of the composite microspheres; BaSO4 in the composite microspheres has an orthogonal barite structure. The experimental BaSO4 PAM composite microspheres have both the flexibility of polymers and the rigidity of inorganic substances. Zhai Junxue and others studied the effect of modified nano barium sulfate on the properties of nr/br blends. The results showed that the modified nano barium sulfate partially replaced carbon black, the scorch time and positive vulcanization time of nr/br blend were prolonged, the processability and heat-resistant air aging properties were good, the flexion resistance was excellent, and the hysteresis loss and heat generation were low

development trend of barium sulfate filled plastic modification from the above research status of barium sulfate filled plastic modification, the development trend of BaSO4 filled plastic in the future mainly focuses on the following aspects:

1) Greening: today, when advocating environmental protection, circular economy and sustainable development, the development and use of environment-friendly fillers are particularly important

2) nanocrystallization: nanoscale barium sulfate has special properties that are different from ordinary barium sulfate, such as superior optical properties; Good dispersion performance can increase the dimensional stability of

products, improve the thermal conductivity of products, increase the added value of products, and have broad market prospects

3) functional direction: the development of science and technology puts forward higher requirements for material properties, and also promotes the development of fillers in the direction of multi-function. In the future, composites with higher performance such as wear-resistant, aging resistant and heat-resistant will be developed

5 conclusion

barium sulfate is widely used because of its unique excellent properties. It has made remarkable achievements in the plastic industry and has become one of the indispensable and important functional materials in the plastic industry China is rich in BaSO4 resources, so it is necessary to speed up the upgrading of products, improve the grade, and effectively promote its healthy development in the plastic industry. It is necessary to further develop new plastic products with BaSO4 as filler, and give full play to its performance advantages in various plastics, such as wear resistance, aging resistance, etc., so as to reduce the cost of composite materials, improve the comprehensive properties of composite materials, and open up new fields of BaSO4 application in China. The research on the modification of polymer by BaSO4 powder has broad prospects and high economic value

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