CN109705459B - Plastic rope and production process thereof - Google Patents
Plastic rope and production process thereof Download PDFInfo
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- CN109705459B CN109705459B CN201811438629.9A CN201811438629A CN109705459B CN 109705459 B CN109705459 B CN 109705459B CN 201811438629 A CN201811438629 A CN 201811438629A CN 109705459 B CN109705459 B CN 109705459B
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Abstract
The invention discloses a plastic rope and a production process thereof, belonging to the technical field of plastic rope processing, and the technical scheme is that the production process of the plastic rope comprises the following steps: the raw materials of the composite material comprise polypropylene resin, linear low-density polyethylene resin, a tackifier, a lubricant, an antioxidant and an opening agent, wherein the tackifier comprises an ethylene-1-octene copolymer, an ethylene-ethyl acrylate copolymer, hydrogenated rosin glyceride and polymethylhydrosiloxane in a weight ratio of 3:3:1: 1. According to the invention, the plastic belts formed into the film by blow molding are twisted to prepare the plastic rope, and when the plastic rope is baked, the tackifier in the plastic rope is matched with the lubricant, so that the connection strength between the plastic belts is enhanced, the gap on the plastic rope is reduced, and the compactness of the plastic rope is improved, thereby improving the tear resistance of the plastic rope.
Description
Technical Field
The invention relates to the technical field of plastic rope processing, in particular to a plastic rope and a production process thereof.
Background
The production process of the plastic rope comprises the following steps: polypropylene or polyethylene is taken as a base material, is blended with a processing aid, is subjected to melt extrusion or blow molding to form a film, is cut into narrow strips with a certain width, and is subjected to stretching and shaping; the plastic rope is widely used for bundling goods because of low price, simple production process and high tensile strength.
Although the plastic rope has high tensile strength, the tearing resistance of the plastic rope is poor, and when the plastic rope is torn along the longitudinal direction of the plastic rope, the plastic rope can be easily divided into a plurality of silk threads, so that the service life of the plastic rope is reduced, and therefore how to improve the tearing resistance of the plastic rope is a problem to be solved.
Disclosure of Invention
One of the purposes of the invention is to provide a production process of a plastic rope, which is characterized in that a plastic belt formed by blow molding is twisted to form the plastic rope, and when the plastic rope is baked, a tackifier in the plastic rope is matched with a lubricant, so that the connection strength between the plastic belts is enhanced, gaps on the plastic rope are reduced, the compactness of the plastic rope is improved, and the tear resistance of the plastic rope is improved.
The technical purpose of the invention is realized by the following technical scheme:
a production process of a plastic rope comprises the following steps:
s1, blending: mixing 70-80 parts by weight of polypropylene resin, 15-20 parts by weight of linear low density polyethylene resin, 16-20 parts by weight of tackifier, 2-3 parts by weight of lubricant, 1-2 parts by weight of antioxidant and 1-2 parts by weight of opening agent to obtain a mixed material;
s2, blow molding: the mixture is put into a film blowing machine for film blowing and forming, wherein the temperature of a main machine is set to be 200-220 ℃, and the temperature of a die head is set to be 220-230 ℃;
s3, cutting: cutting the plastic film into a plurality of plastic belts with the width of 60-100 mm;
s4, twisting: twisting the three plastic belts into plastic ropes at the temperature of 310-320 ℃;
s5, baking: baking the plastic rope at the temperature of 420-430 ℃;
s6, cooling: cooling the baked plastic rope by cold air to room temperature;
wherein the tackifier is prepared by uniformly mixing ethylene-1-octene copolymer, ethylene-ethyl acrylate copolymer, hydrogenated rosin glyceride and polymethylhydrosiloxane in a weight ratio of 3:3:1: 1.
By adopting the technical scheme, the polypropylene resin is used as the base material and the processing aid, after the film is formed by melt blow molding, the three plastic belts are twisted to form the plastic rope, and the plastic rope is heated to shrink when being baked; and under the high temperature state, when the tackifier in the plastic rope is matched with the lubricant, the plastic rope can be quickly melted, has larger fluidity, can strengthen the connection strength between the plastic belts, reduces the gap on the plastic rope, improves the compactness of the plastic rope, and can migrate to the surface of the plastic rope to wrap the surface of the plastic rope, thereby improving the tear resistance of the plastic rope.
The invention is further configured to: the density of the polypropylene resin is 0.904/cm 3 The melt index is 2 g/min; the linear low density polyethylene has a density of 0.918g/cm 3 The melt index was 2g/10 min.
By adopting the technical scheme, the melt indexes of the polypropylene resin and the linear low-density polyethylene resin are the same, and the flow speeds of the polypropylene resin and the linear low-density polyethylene resin can be basically the same during processing, so that the mixing uniformity of the raw materials can be improved, the processing performance is improved, and the prepared plastic film has uniform thickness and higher tensile strength and tear strength.
The invention is further configured to: the content of the ethyl acrylate in the ethylene-ethyl acrylate copolymer is 15-20%.
By adopting the technical scheme, the ethylene-ethyl acrylate copolymer (EEA) has good flexibility, thermal stability and processability, the content of ethyl acrylate in the EEA is controlled to be 15-20%, and when the ethylene-ethyl acrylate copolymer is used as a tackifier, the ethylene-ethyl acrylate copolymer has good fluidity and low melting temperature, can reduce baking time and improve the bonding strength of a plastic rope.
The invention is further configured to: the lubricant comprises polyethylene wax, palm wax and 2-bromohexadecanoic acid in a weight ratio of 3:1: 1.
By adopting the technical scheme, when the polyethylene wax, the palm wax and the 2-bromohexadecanoic acid are compounded for use, the flowability of the tackifier can be improved, the thermal stability of the plastic rope can be improved, the thermal decomposition of the plastic rope during baking is prevented, and the mechanical property of the plastic rope is favorably improved.
The invention is further configured to: the antioxidant comprises an antioxidant 1010 and an antioxidant 168 in a weight ratio of 3: 1.
By adopting the technical scheme, the antioxidant 1010 and the antioxidant 168 have a synergistic effect when used, can improve the thermal stability of the plastic rope, reduce the thermal decomposition of the plastic rope during baking, and are favorable for improving the mechanical property of the plastic rope.
The invention is further configured to: the opening agent is a silicon dioxide opening agent.
By adopting the technical scheme, the opening agent also becomes a slipping agent, an anti-blocking agent and the like, and is used for producing plastic films, so that the opening performance of the films can be effectively improved, the friction of resin in the processing process can be reduced by the silicon dioxide opening agent, the forming melt viscosity of resin particles is reduced, and the flowability of the resin is improved.
The invention is further configured to: in S2, the temperatures of the first, second, third and fourth zones of the mainframe were set to 200 deg.C, 215 deg.C, 220 deg.C and 210 deg.C, respectively.
By adopting the technical scheme, the temperature of the main machine of the film blowing machine is respectively set to 200 ℃, 215 ℃, 220 ℃ and 210 ℃, so that the processing fluidity of resin is facilitated, the thermal decomposition phenomenon is reduced, and the production efficiency is facilitated to be improved.
The invention is further configured to: the twist in S4 is 20-30 twists/10 cm.
By adopting the technical scheme, the polypropylene plastic rope has good tensile strength, but the tearing strength is low, and the greater the twist of the plastic rope, the greater the tearing strength, so that the invention only needs to set the twist of the plastic rope to be 20-30 twists/cm, not only can obtain good processing performance, but also can ensure that the plastic rope has good tensile strength and good tearing strength.
The invention is further configured to: baking in S5 means: heating the metal plate with the guide holes to 90-95 ℃, and then enabling the plastic rope to penetrate through the guide holes at the speed of 50-60m/min, so that the metal plate can bake the surface of the plastic rope.
By adopting the technical scheme, the metal plate is heated to the temperature of 420-430 ℃, the melting temperature of the tackifier and the lubricant can be reached, and the heating time of the plastic rope can be shortened and the thermal decomposition of the plastic rope can be reduced when the plastic rope rapidly passes through the guide hole at the speed of 50-60 m/min.
The invention also aims to provide a plastic rope.
In summary, compared with the prior art, the invention has the following beneficial effects: the plastic tape formed by blow molding is twisted to form the plastic rope, and when the plastic rope is baked, the tackifier in the plastic rope is matched with the lubricant, so that the connection strength between the plastic tapes is enhanced, the gaps on the plastic rope are reduced, and the compactness of the plastic rope is improved; and the tackifier and the lubricant in a flowing state can migrate to the surface of the plastic rope to wrap the surface of the plastic rope, so that the tear resistance of the plastic rope is improved.
Detailed Description
The present invention will be described in further detail below.
First, an embodiment
Example 1: the plastic rope is produced by adopting the following process:
s1, blending: mixing 70kg of polypropylene resin, 15kg of linear low-density polyethylene resin, 6kg of ethylene-1-octene copolymer, 6kg of ethylene-ethyl acrylate copolymer, 2kg of hydrogenated rosin glyceride, 2kg of polymethylhydrosiloxane, 1.2kg of polyethylene wax, 0.4kg of palm wax, 0.4kg of 2-bromohexadecanoic acid, 0.75kg of antioxidant 1010, 0.75kg of antioxidant 168 and 1kg of silicon dioxide opening agent to obtain a mixture;
s2, blow molding: putting the blend into a film blowing machine, and performing blow molding to form a film, wherein the temperatures of a first area, a second area, a third area and a fourth area of a main machine are respectively set to be 200 ℃, 215 ℃, 220 ℃ and 210 ℃, and the temperature of a die head is set to be 220 ℃;
s3, cutting: cutting the plastic film into a plurality of plastic belts with the width of 60 mm;
s4, twisting: twisting the three plastic belts at the temperature of 310 ℃ into a plastic rope with the twist of 20 twists/10 cm;
s5, baking: heating the metal plate with the guide hole to 420 ℃, and then enabling the plastic rope to pass through the guide hole at the speed of 50m/min, so that the metal plate can bake the surface of the plastic rope;
s6, cooling: and cooling the baked plastic rope by cold air to room temperature.
Wherein the density of the polypropylene resin is 0.904/cm 3 The melt index is 2 g/min; the linear low density polyethylene has a density of 0.918g/cm 3 The melt index is 2g/10 min; the ethyl acrylate content of the ethylene-ethyl acrylate copolymer was 15%.
Example 2: the plastic rope is produced by adopting the following process:
s1, blending: mixing 75kg of polypropylene resin, 17.5kg of linear low density polyethylene resin, 6.75kg of ethylene-1-octene copolymer, 6.75kg of ethylene-ethyl acrylate copolymer, 2.25kg of hydrogenated rosin glyceride, 2.25kg of polymethylhydrosiloxane, 1.5kg of polyethylene wax, 0.5kg of palm wax, 0.5kg of 2-bromohexadecanoic acid, 1.125kg of antioxidant 1010, 1.125kg of antioxidant 168 and 1.5kg of silica opening agent to obtain a mixture;
s2, blow molding: putting the blend into a film blowing machine, and carrying out blow molding to form a film, wherein the temperatures of a first area, a second area, a third area and a fourth area of a main machine are respectively set to be 200 ℃, 215 ℃, 220 ℃ and 210 ℃, and the temperature of a die head is set to be 225 ℃;
s3, cutting: cutting the plastic film into a plurality of plastic belts with the width of 80 mm;
s4, twisting: twisting the three plastic belts at 315 ℃ into a plastic rope with the twist of 25 twists/10 cm;
s5, baking: heating the metal plate with the guide holes to 425 ℃, and then enabling the plastic rope to penetrate through the guide holes at the speed of 55m/min, so that the metal plate can bake the surface of the plastic rope;
s6, cooling: and cooling the baked plastic rope by cold air to room temperature.
Wherein the density of the polypropylene resin is 0.904/cm 3 The melt index is 2 g/min; the linear low density polyethylene has a density of 0.918g/cm 3 The melt index is 2g/10 min; the ethyl acrylate content of the ethylene-ethyl acrylate copolymer was 17.5%.
Example 3: the plastic rope is produced by adopting the following process:
s1, blending: mixing 80kg of polypropylene resin, 20kg of linear low density polyethylene resin, 7.5kg of ethylene-1-octene copolymer, 7.5kg of ethylene-ethyl acrylate copolymer, 2.5kg of hydrogenated rosin glyceride, 2.5kg of polymethylhydrosiloxane, 1.8kg of polyethylene wax, 0.6kg of palm wax, 0.6kg of 2-bromohexadecanoic acid, 1.5kg of antioxidant 1010, 1.5kg of antioxidant 168 and 2kg of silica opener to obtain a mixed material;
s2, blow molding: putting the blend into a film blowing machine, and carrying out blow molding to form a film, wherein the temperatures of a first area, a second area, a third area and a fourth area of a main machine are respectively set to be 200 ℃, 215 ℃, 220 ℃ and 210 ℃, and the temperature of a die head is set to be 230 ℃;
s3, cutting: cutting the plastic film into a plurality of plastic belts with the width of 100 mm;
s4, twisting: twisting the three plastic belts at 320 ℃ to form a plastic rope with 30 twists/10 cm;
s5, baking: heating the metal plate with the guide hole to 430 ℃, and then enabling the plastic rope to penetrate through the guide hole at a speed of 60m/min, so that the metal plate can bake the surface of the plastic rope;
s6, cooling: and cooling the baked plastic rope by cold air to room temperature.
Wherein the density of the polypropylene resin is 0.904/cm 3 The melt index is 2 g/min; the linear low density polyethylene has a density of 0.918g/cm 3 The melt index is 2g/10 min; the ethyl acrylate content of the ethylene-ethyl acrylate copolymer was 20%.
Example 4: this example is different from example 1 in that the temperature in S5 was set to 425 ℃.
Example 5: the present embodiment is different from embodiment 1 in that the temperature in S5 is set to 430 ℃.
Second, comparative example
Comparative example 1: this comparative example is different from example 1 in that the raw material of the plastic rope does not contain a tackifier.
Comparative example 2: this comparative example differs from example 1 in that the raw material of the plastic rope contains no lubricant.
Comparative example 3: this comparative example is different from example 1 in that the tackifier and lubricant are not contained in the raw material of the plastic rope.
Comparative example 4: the comparative example is different from example 1 in that the temperature in S5 is set to 410 ℃.
Comparative example 5: the comparative example is different from example 1 in that the temperature in S5 is set to 440 ℃.
Third, performance test
The properties of the example and the comparative plastic rope were measured according to the following criteria, and the test results are shown in table 1.
Tensile strength: according to GB/T1040.1-2006 part 1 of Plastic tensile Property test method: the tensile strength of the plastic rope was tested in general rules.
Elongation at break: according to GB/T1040.1-2006 part 1 of Plastic tensile Property test method: the elongation at break of the plastic rope was tested in general.
Tear strength: GB/T16578.1-2008 "determination of tear resistance of Plastic films and sheets part 1: trouser tear method, the tear strength of plastic ropes was tested.
TABLE 1
From the above data, it can be seen that the plastic rope prepared according to the present invention has good tensile strength, elongation at break and tear strength.
The baking temperature of example 4 was 425 ℃ which shows a smaller decrease in tensile strength, elongation at break and tear strength than example 1, indicating that the performance of the plastic rope baked at a temperature of 420 ℃ is better than that of the plastic rope baked at a temperature of 425 ℃.
The baking temperature of example 5 was 430 c, and the tensile strength, elongation at break and tear strength were reduced to a smaller extent than those of example 1, indicating that the performance of the plastic rope baked at a temperature of 420 c was superior to that of the plastic rope baked at a temperature of 430 c.
Compared with the example 1, the tensile strength and the elongation at break of the raw materials in the comparative example 1 are reduced, and the tear strength is greatly reduced, which shows that the tear strength of the plastic rope is remarkably improved by the tackifier.
The raw material of comparative example 2, to which no lubricant was added, had a reduced tensile strength, elongation at break and tear strength compared to example 1, indicating that the lubricant contributes to the improvement of the tensile strength, elongation at break and tear strength of the plastic cord.
Compared with the raw materials in the example 1, the raw materials in the comparative example 3 are not added with the tackifier and the lubricant, so that the tensile strength and the elongation at break are reduced, and the tearing strength is greatly reduced, which shows that the tackifier and the lubricant can obviously improve the tearing strength of the plastic rope; compared with comparative example 1 and comparative example 2, the tear strength in comparative example 3 is lower, which shows that when the lubricant and the tackifier are compounded and used, a synergistic effect can be exerted, and the tear strength of the plastic rope is greatly improved.
The baking temperature in comparative example 4 was set to 410 c, and the tensile strength, elongation at break and transverse direction tear strength were reduced to a smaller extent than in example 1, but the longitudinal direction tear strength was reduced to a larger extent, indicating that the effect on the longitudinal direction tensile strength of the plastic rope was larger when the temperature was less than 420 c.
The baking temperature in comparative example 5 was set to 440 ℃, and the tensile strength, elongation at break and tear strength were reduced compared to example 1; comparative example 5, which has lower tensile strength and lower elongation at break than comparative example 4 but has higher longitudinal tear strength than comparative example 4, shows that an increase in temperature easily causes thermal decomposition of the plastic, resulting in a decrease in tensile strength and elongation at break, but can increase the adhesive strength between plastic ropes and thus can increase the tear strength of the plastic ropes since the increase in temperature can accelerate the melting of the tackifier.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Claims (7)
1. A production process of a plastic rope is characterized by comprising the following steps: the method comprises the following steps:
s1, blending: mixing 70-80 parts of polypropylene resin, 15-20 parts of linear low-density polyethylene resin, 16-20 parts of tackifier, 2-3 parts of lubricant, 1-2 parts of antioxidant and 1-2 parts of opening agent in parts by weight to obtain a mixed material;
s2, blow molding: putting the mixture into a film blowing machine, and performing blow molding to form a film, wherein the temperature of a host is set to 200-220 ℃, and the temperature of a die head is set to 220-230 ℃;
s3, cutting: cutting the plastic film into a plurality of plastic belts with the width of 60-100 mm;
s4, twisting: twisting the three plastic belts into plastic ropes at the temperature of 310-320 ℃;
s5, baking: heating the metal plate with the guide hole to 420-430 ℃, and then enabling the plastic rope to penetrate through the guide hole at the speed of 50-60m/min, so that the metal plate can bake the surface of the plastic rope;
s6, cooling: cooling the baked plastic rope by cold air to room temperature;
wherein the tackifier is prepared by uniformly mixing ethylene-1-octene copolymer, ethylene-ethyl acrylate copolymer, hydrogenated rosin glyceride and polymethylhydrosiloxane in a weight ratio of 3:3:1: 1; the content of the ethyl acrylate in the ethylene-ethyl acrylate copolymer is 15 to 20 percent; the lubricant comprises polyethylene wax, palm wax and 2-bromohexadecanoic acid in a weight ratio of 3:1: 1.
2. The process for producing a plastic rope according to claim 1, wherein: the density of the polypropylene resin is 0.904g/cm 3 The melt index is 2g/10 min; the linear low density polyethylene has a density of 0.918g/cm 3 The melt index was 2g/10 min.
3. The process for producing a plastic rope according to claim 1, wherein: the antioxidant comprises an antioxidant 1010 and an antioxidant 168 in a weight ratio of 3: 1.
4. The process for producing a plastic rope according to claim 1, wherein: the opening agent is a silicon dioxide opening agent.
5. The process for producing a plastic rope according to claim 1, wherein: in S2, the temperatures of the first, second, third and fourth zones of the mainframe were set to 200 deg.C, 215 deg.C, 220 deg.C and 210 deg.C, respectively.
6. The process for producing a plastic rope according to claim 1, wherein: the twist in S4 is 20-30 twists/10 cm.
7. A plastic rope produced by the process of any one of claims 1 to 6.
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| CN111333958A (en) * | 2020-04-24 | 2020-06-26 | 界首市宏利塑料有限公司 | High-durability plastic rope |
| CN112522978B (en) * | 2020-12-01 | 2022-01-14 | 界首市聚屹包装材料有限公司 | Preparation method for preparing plastic strapping rope by using reclaimed materials |
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| CN108456362A (en) * | 2018-03-01 | 2018-08-28 | 江苏中天科技股份有限公司 | A kind of netted gasket for packing of PP and preparation method |
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| CN101798720A (en) * | 2010-04-28 | 2010-08-11 | 四川辉腾科技有限公司 | Aramid fiber III on-line thermal treating process and device thereof |
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