Preparation and performance of black-filled powdered nitrile rubber with high wear resistance furnace Zhou Yuyu, Xu Ting, Li Liangxiu, Wang Lianshi School of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong' (Powder rubber is a new type of rubber with no particle size and good fluidity There are various preparation methods, among which the coagulation coating method or the coagulation co-precipitation method is the main method for preparing powder rubber because of the easy control of the powdering process, the process is simple and reliable, and the production cost is low. A. The key technology of the method In the coating and isolation effect of the coating agent on the rubber particles, the first coating agent used is mainly starch xanthate and water-soluble polymer electrolyte coating agent A, but the above coating agent is more or less resistant to vulcanized rubber. The performance of the polymer resin coating agent developed in recent years not only has a good coating and isolation effect on the rubber particles, but also can adjust its compatibility with the rubber, and has a synergistic effect on the properties of the vulcanized rubber. The most ideal coating agent This work uses polymer resin as a coating agent to prepare filled powdered nitrile rubber with high wear-resistant furnace as reinforcing material, and affects the particle size distribution. The factors of physical and mechanical properties of vulcanizate were analyzed.
The experimental part of the raw material nitrile latex, the total solids mass fraction is the petrochemical company's products; 1C, brand number is 0, Shanghai Lishi Chemical Industry Co., Ltd.; polymer resin coating agent, alcohol dispersant, laboratory preparation; other are commonly used additives in the rubber industry.
The sample preparation basic mass part is not included below. The 1C accelerator was added to a three-necked flask. 1C, dispersing agent, distilled water, nitrile latex, coating agent, anti-aging agent, adding flocculating agent after stirring at the set temperature, the product is precipitated as powder, filtering out water, washing with tap water, dehydrating, sieving, Drying gives the vulcanizate a uniform blending agent and mixing it on a two-roll mill, making it thin. The vulcanization time of the sample is tested by a vulcanizer; the sample is vulcanized by a vulcanizing machine, and the vulcanization condition is a performance test according to the cut sample; the physical and mechanical properties of the sample are tested by an electronic tensile machine produced by Shanghai Chemical Machinery No. 4 Factory; The tensile section morphology of the vulcanizate sample was observed by a scanning electron microscope produced by the Netherlands company. 1C dispersion.
Results and Discussion Factors Affecting Particle Size Distribution The role of the dispersant in dispersing agents is to make it. 1C particles uniformly disperse the teaching and research work of PP and polymer materials. The rest of the paper has been published.
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It is mixed with rubber particles to form powder rubber particles of a desired particle size.
It can be seen from the table that as the amount of the dispersant increases, the particle size gradually decreases. This is because as the amount of the dispersant increases, the degree of dispersion of the particles is good, the chance of adhesion between the particles is small, and the contact contamination is also reduced until it is eliminated.
The amount of the coating agent acts to form a coating film on the rubber particles and the surface of the formed particles to isolate the particles from sticking to agglomerates. As can be seen from the table, the particle size decreases as the amount of coating agent increases. When the amount of the coating agent is a part, the particle diameter is not more than,), ...
The quality score is reached! ,,), /. This is because the increase in the amount of coating agent is more conducive to the formation of a tight coating on the surface of the particles, so that they can not stick to each other into agglomerates.
The glass transition temperature of the coating agent!
In order to find out the influence of the coating agent on the particle size distribution, a series of different polymer resins were synthesized for the powdering test, and the coating agent with the best powdering effect was selected. It can be seen from the table that when the coating agent is used, the particle size is not greater than,), ...
The mass fraction is reached; and when the coating agent is lowered or raised, the particle size is not greater than,), ...
Significantly reduced.
This is because the high coating agent has poor film formability and the low coating agent has a high viscosity, and both of them increase the probability of particles sticking to each other. Therefore, in order to obtain the best powdering effect, a moderate coating agent is selected.
The dispersant coating agent can achieve a better effect than the dispersant or the coating agent alone, and can produce a synergistic effect when used. It can be seen from the table that with the mass ratio of the dispersant coating agent 8 and the increase of the same as 9 , the particle size is significantly reduced. When the dispersant coating agent is used, the particle size is not greater than,), ...
The quality score is reached! ,,), /. This is because the dispersant firstly disperses the particles sufficiently, and then the added coating agent coats the rubber particles and the composed particles, so that the chance of particle bonding is less than when only the dispersant is used, and With the increase of the amount of dispersant, the better the dispersion effect on the particles, and the excellent coating effect of the coating agent, the smaller the particle size.
Factors affecting the physical and mechanical properties of vulcanizates. The mass fraction of dispersant can be seen from the table. The tensile stress, tensile stress, Shore hardness and tensile strength of vulcanizate decrease with the increase of dispersant mass fraction. The elongation at break is on the rise, the permanent deformation and the tear strength are unknown. The preparation of the black-filled powder nitrile rubber and the performance of the vulcanized rubber are shown in the figure. Good and evenly distributed, it is closely bonded to the black of the substrate and has a fuzzy transition layer, so the physical and mechanical properties are the best. It can be seen from the figure that the particles are poorly dispersed and there is a size of about! .
The aggregate has an adverse effect on the physical and mechanical properties of the vulcanizate, so that the vulcanizate has a low tensile strength. It can be seen that the physical and mechanical properties of the vulcanizate depend greatly on the dispersion of the particles in the powdered system.
The synthetic rubber industry showed significant changes. This is the result of the dispersant acting as a plasticizer in the vulcanizate.
The mass fraction of the coating agent can be seen from the table. The tensile stress, the tensile stress, the tensile strength and the Shore hardness of the vulcanized rubber increase with the increase of the mass fraction of the coating agent, and the tensile strength is in the coating agent. The mass fraction is basically constant, and the elongation at break, permanent deformation and tear strength are slightly reduced. This is because the coating agent is a high polymer resin and has a certain reinforcing effect on the rubber.
As can be seen from the table, the tensile stress, the tensile stress and the Shore hardness of the vulcanized rubber increase with the increase of the coating agent, and the tensile strength and the tear strength respectively peak at the time. The elongation at break and the permanent deformation decrease as the coating agent increases. This is due to the higher the coating agent, the more significant the reinforcing effect on the vulcanizate. In terms of the tensile stress and the tensile stress of the vulcanized rubber, a high coating agent is preferred. If the tensile strength and other properties are comprehensively considered, the coating agent is ideal. Under these conditions, the tensile stress and tensile strength of the vulcanized rubber are respectively the physical and mechanical properties. The vulcanizate and the block nitrile are listed. The comparison of the physical and mechanical properties of rubber N()P = vulcanizate shows that the two are at the same level. In the coagulation coating method, water and non-rubber substances may impair the surface activity of the particles and reduce the reinforcing effect on the powder rubber vulcanizate. However, the results of this study show that in the middle, the pair still has excellent enhancement effects.
Preparation and properties of black-filled powder nitrile rubber in the first stage of Zhou Yuyu and other high wear-resistant furnaces Wang Lianshi H Sunning Preparation of powder BCD by starch xanthate cross-linking coating method The particle size and its distribution depend on the amount of dispersant, package The amount of coating and its change with the dispersant coating agent.
When the coating agent is e, the mass ratio of the dispersing agent to the coating agent is or, the mass fraction of the particle diameter is not greater than when the coating agent is used, and the tensile strength of the vulcanized rubber is the physical machinery of the vulcanized rubber. performance.
The more uniform the particles are distributed in the matrix rubber, the closer the bond to the matrix is, and the better the physical and mechanical properties of the vulcanizate.
(Finish)
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