CN111073177A - PVC conducting bar and preparation method thereof - Google Patents
PVC conducting bar and preparation method thereof Download PDFInfo
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- CN111073177A CN111073177A CN201911391832.XA CN201911391832A CN111073177A CN 111073177 A CN111073177 A CN 111073177A CN 201911391832 A CN201911391832 A CN 201911391832A CN 111073177 A CN111073177 A CN 111073177A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a PVC conducting strip and a preparation method thereof, wherein the raw materials of the PVC conducting strip comprise 100 parts of PVC resin, 65-80 parts of plasticizer, 3-5 parts of stabilizer, 1-2 parts of lubricating assistant, 3-6 parts of epoxidized soybean oil, 3 parts of color paste, 30-42 parts of powder rubber and 2-5.5 parts of modified SiO2. Compared with the prior art, the PVC conducting bar provided by the invention effectively improves the smoothness and wear resistance of the conveying belt conducting barThe service life of the guide strip is prolonged, and the service cycle of the conveying belt is prolonged.
Description
Technical Field
The invention relates to the technical field of industrial conveying belts, in particular to a PVC guide strip and a preparation method thereof.
Background
With the increasing automation degree of modern production, the application of the conveying belt is more and more extensive, the use working conditions are more and more complex, the required functions are more and more delicate, the service life is required to be longer and longer, and the requirements on the specialization of producers are more and more high. In the use process of the conveying belt, because the material distribution cannot be uniform, the machine equipment is not stable, the machine shakes and the like, when the conveying belt runs, the conditions of deviation and deflection are inevitable to a greater or lesser extent, the conveying belt swings left and right when running, even deflects to be seriously scraped with a rack, and the conveying belt is damaged and has equipment faults.
In order to solve the problem, guide strips with the guide function of the conveying belt are additionally arranged on conveying belts which are high in running speed and require materials to be conveyed accurately. The rollers and the supporting plate of the machine are grooved corresponding to the size and the position of the conducting bars on the conveying belt, so that the conducting bars of the conveying belt are embedded in the grooves to slide, and the conveying belt is prevented from deflecting and deviating. However, the conducting bars slide in the grooves and are relatively rubbed and abraded, the service life of the conducting bars is limited, and the service life of the whole conveying belt is also limited. The conducting bars on the market are all made of pure PVC materials, and the wear resistance is not very good. For this reason, it is necessary to produce a bar having high wear resistance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a PVC conducting bar with high smoothness and wear resistance and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a PVC conducting strip and a preparation method thereof, wherein the raw materials of the PVC conducting strip comprise 100 parts of PVC resin, 65-80 parts of plasticizer, 3-5 parts of stabilizer, 1-2 parts of lubricating assistant, 3-6 parts of epoxidized soybean oil, 3 parts of color paste, 30-42 parts of powder rubber and 2-5.5 parts of modified SiO2(ii) a The preparation method of the PVC conducting bar comprises the following steps:
step a) feeding: sequentially adding solid raw materials of PVC resin, a lubricating assistant, color paste and powdered rubber into a stirrer, and then sequentially adding a liquid raw material of a plasticizer, a stabilizer and epoxidized soybean oil;
step b) first stirring: stirring and heating, continuously stirring until the temperature of the materials reaches 95 +/-5 ℃, and adding the modified SiO2；
Step c) second stirring: continuously stirring and heating until the temperature of the material reaches 110 +/-3 ℃, and stopping stirring to obtain a wet powdery material;
step d) granulation: putting the wet powdery material obtained in the step c) into a special extruder for granulation, and granulating to obtain granular materials;
step e) producing conducting bars: installing a conducting bar forming die on the special extruder for conducting bar production, and putting the granular material obtained in the step d) into the special extruder for conducting bar production to obtain the finished conducting bar.
The technical scheme is further improved as follows:
modified SiO in step b)2Is prepared by the reaction of the catalyst of platinum-nickel and palm wax.
The stirring speed in step b) and step c) was 1500 rpm.
The diameter of the granular material in the step d) is 2-3 mm.
The drawing speed for producing the conducting bar in the step e) is 5 m/min.
The plasticizer is a polyadipate.
The stabilizer is selected from zinc isooctanoate and/or calcium oleate.
The lubricating auxiliary agent is methyl methacrylate.
The powder rubber accounts for 40 parts.
The modified SiO2The parts of (A) are 5 parts.
The PVC guide strip comprises the following raw materials of 100 parts of PVC resin, 70 parts of plasticizer, 4 parts of stabilizer, 1 part of lubricating additive, 3 parts of epoxidized soybean oil, 3 parts of color paste, 40 parts of powder rubber and 5 parts of modified SiO2。
It is worth mentioning that, on the one hand, PVC conductors do not have very good wear resistance when using pure PVC material with a high degree of polymerization, which is determined by the material properties of PVC. In general, rubber is added to the raw materials in order to make the PVC busbar more wear-resistant, and the higher the concentration of the rubber, the higher the degree of crosslinking of the composite, and the better the wear resistance. The conducting bar needs to be welded on the surface of the conveying belt, and the compatibility of the modified material and PVC needs to be considered, so that the conducting bar can be firmly welded on the conveying belt; and considering the feasibility of extrusion production in terms of process. Through experiments, the inventor finds that when 30-42 parts of powdered rubber is added into the raw material, the formed composite material has high crosslinking degree and good compatibility with pure PVC.
On the other hand, the smoother the material surface, the smaller the frictional resistance, and the less the guide bar is subjected to abrasion damageThe friction resistance of the guide bar is large because of two reasons: firstly, the friction coefficient of the material is large, and the other reason is that the surface brightness of the conducting bar is high, the viscosity of the conducting bar is large, and the resistance is large. The smoothness of the surface of the PVC guide bar needs to be ensured, and the smoother the surface of the PVC guide bar is, the smaller the frictional resistance is, and the more wear-resistant the guide bar is. In order to improve the smoothness of the surface of the conducting bar, the smoothness of the material is improved by adding an auxiliary agent; meanwhile, the brightness of the surface of the conducting bar is reduced by adding the auxiliary agent, and even the effect of a matte surface is achieved, so that the viscosity of the surface of the conducting bar is reduced. The same considerations also need to be taken into account that the conducting bars need to be welded on the surface of the conveyor belt, the compatibility of the modified material and the PVC cannot be affected, the conducting bars can be firmly welded on the conveyor belt, and the feasibility of extrusion production on the process is ensured. Most importantly, the inventor finds that when the auxiliary agent is selected to be modified SiO in the preparation experiment for reducing the friction force of the PVC conducting bar2When (the modified SiO2Adopts 98 percent of SiO2And 2% of palm wax, the oxygen atom "- - -O- -" of the high molecular weight palm wax being reacted with SiO during the modification2The silicon atom in the silicon-silicon composite material forms a stable silicon-oxygen bond, so that the modified SiO2Not only has the wear resistance, but also has excellent smooth performance and matte effect), and when the addition amount is 5 parts and the heating temperature is up to 95 ℃, the modified SiO has the advantages of good wear resistance, good smoothness and matte effect, and good wear resistance, and can be used for preparing a coating for2Has the best compatibility and smoothness with the materials in a pre-plasticized state. The reason is that when the temperature is lower than 95 ℃, modified SiO is added2The modified SiO is destroyed by stirring for a long time before the material reaches 95 deg.C2Activity of (a); when the temperature is higher than 95 ℃, modified SiO is added2The material exceeds the preplasticizing state, and the material is not in contact with the modified SiO2The optimum compatible state is that 3-5.5 parts of modified SiO are added into the raw material2And meanwhile, the smoothness of the PVC and the surface matte effect of the product are obviously improved.
In conclusion, compared with the prior art, the PVC guide strip provided by the invention effectively improves the smoothness and wear resistance of the conveyor belt guide strip, prolongs the service life of the guide strip and prolongs the service cycle of the conveyor belt.
Detailed Description
The present invention will be described more fully with reference to the following examples and comparative examples.
Example 1
(1)SiO2Modification: SiO with the mass percent of 98 percent is added into a reaction vessel in sequence22 percent of palm wax and 5 percent of platinum-nickel catalyst, stirring for 10min under the pressure of 5MP and at the modification temperature of 100-105 ℃, cooling to room temperature, and filtering to obtain modified SiO2；
(2) Preparing materials: according to 100 parts of PVC resin, 70 parts of plasticizer, 4 parts of stabilizer, 1 part of lubricating additive, 3 parts of epoxidized soybean oil, 3 parts of color paste, 40 parts of powder rubber and 5 parts of modified SiO2Raw materials are ready for use;
material type and name comparison table
(3) Feeding: adding the prepared solid raw materials of PVC resin, a lubricating assistant, color paste, powdered rubber and the like into a stirring kettle, and adding the liquid raw materials of a plasticizer, a stabilizer, epoxy soybean oil and the like into the stirring kettle;
(4) stirring for the first time: starting a stirrer of the stirring kettle, setting the stirring speed to be 1500 rpm, starting a heating power supply of the stirring kettle after the stirring speed is stable, continuously stirring until the temperature of the materials reaches 95 +/-5 ℃, and adding the modified SiO2；
(5) Stirring for the second time: adding modified SiO2Continuing heating and stirring at the rotating speed of 1500 rpm until the temperature of the material reaches 110 +/-3 ℃, and stopping stirring to obtain a wet powdery material;
(6) and (3) granulation: putting the wet powdery material obtained in the step d) into a special extruder for granulation, and granulating to obtain a material with the diameter of 2-3 mm;
(7) producing a conducting bar: installing a conducting bar forming die, and putting the granular material obtained in the step e) into a special extruder for conducting bar production to produce a finished conducting bar (the traction speed is 5 m/min).
Comparative example 1
(1) Preparing materials: preparing 100 parts of PVC resin, 70 parts of plasticizer, 4 parts of stabilizer, 1 part of lubricating additive, 3 parts of epoxidized soybean oil and 3 parts of color paste raw materials for later use;
material type and name comparison table
(2) Feeding: adding the prepared solid raw materials of PVC resin, lubricating additive, color paste and the like into a stirring kettle, adding the liquid raw materials of plasticizer, stabilizer, epoxy soybean oil and the like into the stirring kettle,
(3) stirring: starting a stirrer of the stirring kettle, starting a heating power supply of the stirring kettle after the stirring speed is 1500 rpm and the stirring speed is stable, continuously stirring until the temperature of the materials reaches 110 +/-3 ℃, stopping stirring,obtaining a moist powdery material；
(4) And (3) granulation: putting the wet powdery material obtained in the step d) into a special extruder for granulation, and granulating to obtain a material with the diameter of 2-3 mm;
(5) producing a conducting bar: installing a conducting bar forming die, and putting the granular material obtained in the step e) into a special extruder for conducting bar production to produce a finished conducting bar (the traction speed is 5 m/min).
Performance comparison test
The PVC conducting bar prepared by the invention and the conducting bar produced by the prior art are subjected to related performance tests under the test conditions of 25 ℃ of temperature and 50% of humidity, and the performance tests are compared and shown in Table 1.
TABLE 1 comparison of conducting bar Performance test data
As can be seen from Table 1: 1. the abrasion loss of the modified formula is only 38.49% of that of the common formula, which shows that the abrasion resistance of the modified formula is greatly improved; 2. the friction coefficient of the modified formula is only 53.80% of that of the common formula, which shows that the smoothness of the modified formula material is greatly improved.
Finally, it must be said here that: the above embodiments are only used for further detailed description of the technical solutions of the present invention, and should not be understood as limiting the scope of the present invention, and the insubstantial modifications and adaptations made by those skilled in the art according to the above descriptions of the present invention are within the scope of the present invention.
Claims (10)
1. The PVC conducting strip is characterized by comprising 100 parts of PVC resin, 65-80 parts of plasticizer, 3-5 parts of stabilizer, 1-2 parts of lubricating assistant, 3-6 parts of epoxidized soybean oil, 3 parts of color paste, 30-42 parts of powder rubber and 2-5.5 parts of modified SiO2(ii) a The preparation method of the PVC conducting bar comprises the following steps:
step a) feeding: sequentially adding solid raw materials of PVC resin, a lubricating assistant, color paste and powdered rubber into a stirrer, and then sequentially adding a liquid raw material of a plasticizer, a stabilizer and epoxidized soybean oil;
step b) first stirring: stirring and heating, continuously stirring until the temperature of the materials reaches 95 +/-5 ℃, and adding the modified SiO2；
Step c) second stirring: continuously stirring and heating until the temperature of the material reaches 110 +/-3 ℃, and stopping stirring to obtain a wet powdery material;
step d) granulation: putting the wet powdery material obtained in the step c) into a special extruder for granulation, and granulating to obtain granular materials;
step e) producing conducting bars: installing a conducting bar forming die on the special extruder for conducting bar production, and putting the granular material obtained in the step d) into the special extruder for conducting bar production to obtain the finished conducting bar.
2. The PVC conducting bar and the preparation method thereof according to claim 1, wherein the modified SiO is prepared in step b2Comprises the following steps: SiO with the mass percent of 98 percent is added into a reaction vessel in sequence22 percent of palm wax and 5 percent of platinum-nickel catalyst, stirring for 10min under the pressure of 5MP and at the modification temperature of 100-105 ℃, cooling to room temperature, and filtering to obtain modified SiO2。
3. The PVC conductor and the process for preparing the same according to claim 1, wherein the stirring speed in the steps b) and c) is 1500 rpm.
4. The PVC conducting bar and the preparation method thereof according to claim 1, wherein the diameter of the granular material in step d) is 2-3 mm.
5. The PVC guide strip and the process for preparing the same as claimed in claim 1, wherein the drawing speed of the guide strip produced in the step e) is 5 m/min.
6. The PVC conducting bar and the method for preparing the same as claimed in claim 1, wherein said stabilizer is selected from zinc isooctanoate and/or calcium oleate.
7. The PVC conducting bar and the preparation method thereof according to claim 1, wherein the lubricating auxiliary agent is methyl methacrylate.
8. The PVC conducting bar and the preparation method thereof as claimed in claim 1, wherein the powder rubber is 40 parts.
9. The PVC conducting bar and the preparation method thereof according to claim 1, wherein the modified SiO is2The parts of (A) are 5 parts.
10. The PVC conducting bar and the preparation method thereof as claimed in claim 1, wherein the raw materials of the PVC conducting bar comprise 100 parts of PVC resin, 70 parts of plasticizer, 4 parts of stabilizer, 1 part of lubricating assistant, 3 parts of epoxidized soybean oil, 3 parts of color paste, 40 parts of powdered rubber and 5 parts of modified SiO2。
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| CN201911391832.XA CN111073177A (en) | 2019-12-30 | 2019-12-30 | PVC conducting bar and preparation method thereof |
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| CN201911391832.XA CN111073177A (en) | 2019-12-30 | 2019-12-30 | PVC conducting bar and preparation method thereof |
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2019
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