CN114133689A - Radiation crosslinking polypropylene thermal shrinkage belt base material and preparation method thereof - Google Patents
Radiation crosslinking polypropylene thermal shrinkage belt base material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/246—Intercrosslinking of at least two polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
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- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
- C08L2312/06—Crosslinking by radiation
Abstract
The invention provides a radiation crosslinking polypropylene thermal shrinkage belt base material and a preparation method thereof, wherein the base material comprises the following components in percentage by mass: 50-70% of block copolymer polypropylene, 7-15% of metallocene polypropylene, 8-20% of high-density polyethylene, 10-15% of polyolefin block copolymer, 1-2% of sensitizer, 2-5% of maleic anhydride grafted polypropylene, 0.5-1% of antioxidant and 0.5-1% of color master batch, wherein the sum of the mass percentages of the components is 100%. By adopting the technical scheme of the invention, the shrinkage rate, the strength and other properties of the sheet are improved, so that the material still keeps higher shrinkage rate and mechanical strength after radiation crosslinking, and various physical and chemical properties such as mechanical strength and the like can meet the standard requirements, and the sheet also has better performances such as fire resistance and the like; and secondly, the method is suitable for two-step production, improves the production efficiency and reduces the energy consumption and equipment investment.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a radiation crosslinking polypropylene heat-shrinkable tape base material and a preparation method thereof.
Background
The anticorrosive polypropylene pyrocondensation area of usefulness of three-layer polypropylene steel pipeline node repaired mouth comprises radiation cross-linking polypropylene substrate and polypropylene hot melt adhesive, when the construction, the radiation cross-linking polypropylene substrate produces the shrink under the condition of heating, wrap tightly on protected steel pipe welding department and the both sides polypropylene anticorrosive coating, the radiation cross-linking polypropylene substrate conducts heat when heating the shrink, make the melting of inlayer polypropylene hot melt adhesive or adopt the mode heat transfer of intermediate frequency heating to make inlayer polypropylene hot melt adhesive melting, thereby realize the sealed of no solvent epoxy coating and the bonding of steel pipe polypropylene anticorrosive coating on the steel pipe of welding department. At present, the radiation cross-linking polypropylene base material of the polypropylene heat-shrinkable belt for the corrosion prevention of the polypropylene steel pipeline is required to have the shrinkage rate of more than 15 percent, so that the good shrinkage property in the joint coating installation process is ensured, the sealing property and the smooth and attractive appearance of the joint coating installation are ensured, therefore, the traditional production process comprises the steps of extruding the uniformly mixed polypropylene base material through a single-screw or double-screw extruder extrusion production line to form a 1.5-2.5 mm sheet, then carrying out irradiation cross-linking through an electronic accelerator, heating the sheet subjected to irradiation cross-linking through stretching equipment to the glass transition temperature of polypropylene to carry out stretching orientation and cooling setting, finally producing the polypropylene heat-shrinkable base material with the thickness of 1.0-1.5 mm and the shrinkage rate of 20-50 percent, the traditional three-step method for producing the radiation cross-linking polypropylene base material has relatively more working procedures, particularly, the energy consumption of the heating and stretching working procedures is higher, and the radiation cross-linking polypropylene base material formed by stretching has larger axial shrinkage in the installation and shrinkage processes, because the position of the fixing piece is fixed by the fixing piece and has small contraction, the local part is easy to contract and narrow, and the appearance is influenced.
Chinese patent CN109651713A discloses a heat-shrinkable strip substrate of repaired mouth crosslinked polypropylene and a preparation and use method thereof, and the adopted production process comprises four steps: extrusion → irradiation → heating stretching → cooling orientation, and the tensile strength of the polypropylene heat-shrinkable tape base material prepared by the method is basically less than 20MPa, which can not meet the requirement of more than or equal to 28MPa required by the national standard GB/T51241-2017.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a radiation crosslinking polypropylene heat-shrinkable belt base material and a preparation method thereof, and the base material can be prepared by a two-step method through the improvement of a formula, so that the energy consumption is saved, the production efficiency is improved, and the performance completely meets the requirements of the national standard GB/T51241-plus 2017.
In contrast, the technical scheme of the invention is as follows:
a radiation crosslinking polypropylene thermal shrinkage belt base material comprises the following components in percentage by mass: 50-70% of block copolymer polypropylene (PPB), 7-15% of metallocene polypropylene (mPP), 8-20% of High Density Polyethylene (HDPE), 10-15% of polyolefin block copolymer (OBC), 1-2% of sensitizer, 2-5% of maleic anhydride grafted polypropylene (PPR-MAH), 0.5-1% of antioxidant and 0.5-1% of color master batch, wherein the sum of the mass percentages of the components is 100%.
By adopting the technical scheme, the low-temperature-resistant and impact-resistant block copolymer polypropylene and the metallocene polypropylene are selected as main materials, the high-density polyethylene, the polyolefin block copolymer and the maleic anhydride grafted polypropylene are used as auxiliary materials, and the material is obtained according to the formula, so that the irradiation crosslinking degree of the material can be greatly improved, the heating, stretching, orientation and cooling procedures are reduced, the efficiency is improved, the energy consumption is reduced, the equipment investment is greatly reduced, simultaneously, as with the three-step process, all performance indexes of the polypropylene substrate meet the standard requirements, and after extrusion, radiation crosslinking is carried out, the heating, stretching and cooling procedures are not needed, the axial shrinkage uniformity can be realized during heating and shrinkage in construction, the phenomenon that the local shrinkage becomes narrow and serious, and the appearance of a heat-shrinkable belt is influenced is avoided.
As a further improvement of the invention, the radiation crosslinking polypropylene heat-shrinkable belt base material comprises the following components in percentage by mass: 55-65% of block copolymer polypropylene, 8-12% of metallocene polypropylene, 10-15% of high-density polyethylene, 11-14% of polyolefin block copolymer, 1.2-1.8% of sensitizer, 2.5-4% of maleic anhydride grafted polypropylene, 0.5-1% of antioxidant and 0.5-1% of color master batch, wherein the sum of the mass percentages of the components is 100%.
As a further improvement of the invention, the radiation crosslinking polypropylene heat-shrinkable belt base material comprises the following components in percentage by mass: 60% of block copolymer polypropylene (PPB); metallocene polypropylene (mPP) 10%; 12% of High Density Polyethylene (HDPE); polyolefin block copolymer (OBC) 12%; sensitizer (TMPTMA/TAIC) 1.5%; 3% of maleic anhydride grafted polypropylene (PP-MAH); 0.7 percent of antioxidant; 0.8 percent of black master batch.
As a further improvement of the invention, the melt flow index of the block copolymerization polypropylene is 1.0-10 g/10min, and the melting point is 160-170 ℃; the melt flow index of the metallocene polypropylene is 8-25 g/10min, and the melting point is 140-150 ℃; the high-density polyethylene has a melt flow index of 0.3-5 g/10 min. By adopting the technical scheme, the block copolymer polypropylene, the metallocene polypropylene and the high-density polyethylene can be easily mixed together, are easy to mix uniformly and are convenient to process.
As a further improvement of the invention, the maleic anhydride grafted polypropylene is maleic anhydride grafted random copolymer polypropylene, wherein the grafting rate of maleic anhydride grafting is 0.8-1.5%.
As a further improvement of the invention, the melt flow index of the random copolymerization polypropylene is 3-10 g/10min, and the melting point is 140-150 ℃. By adopting the technical scheme, the material is easy to process.
As a further improvement of the invention, the melt flow index of the polyolefin block copolymer is 1.0-15 g/10min, and the melting point is 115-125 ℃.
As a further improvement of the present invention, the sensitizer is at least one of trimethylolpropane trimethacrylate (TMPTMA), trimethylolpropane triacrylate (TMPTA), triallyl cyanurate (TAC) or triallyl isocyanurate (TAIC). By adopting the technical scheme, the effect of reducing polypropylene radiation can be resisted, and the radiation crosslinking degree of the material is greatly improved.
As a further improvement of the invention, the antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant SKY-1035.
The invention discloses a preparation method of the radiation crosslinking polypropylene heat-shrinkable belt base material, which comprises the following steps:
step S1, weighing the raw materials according to a formula, mixing, uniformly mixing, putting into a double-screw extruder for melting, extruding and granulating to obtain polypropylene heat-shrinkable belt substrate granules, drying the polypropylene heat-shrinkable belt substrate granules, melting by the double-screw extruder, extruding sheets, calendering, stretching and cooling to obtain the non-irradiated polypropylene heat-shrinkable belt substrate with the shrinkage of 50-65%;
and step S2, carrying out irradiation crosslinking on the polypropylene heat-shrinkable belt base material which is not irradiated to obtain the irradiation crosslinked polypropylene heat-shrinkable belt base material with the circumferential shrinkage rate of 25-40% and the axial shrinkage rate of less than 5%.
Compared with the traditional three-step method, the two-step method production process of extruding the sheet and performing irradiation crosslinking has the advantages that one step is omitted, namely the heating, stretching and cooling process is performed after irradiation, so that the efficiency is improved, but the shrinkage rate of the sheet cannot meet the requirements after the sheet is extruded (the sheet is stretched as well as the two-step method) and the irradiation crosslinking by adopting the same process of the two-step method for the material used in the traditional three-step method. By adopting the formula of the technical scheme, the circumferential shrinkage rate of the irradiation crosslinking polypropylene heat-shrinkable belt substrate produced by adopting the two-step method is 25-40%, and the axial shrinkage rate is less than 5%, so that the irradiation crosslinking polypropylene heat-shrinkable belt substrate obtained by adopting the traditional three-step method has better performance and is more stable.
As a further improvement of the present invention, in step S1, the barrel and die temperatures of the twin-screw extruder for compounding and pelletizing are set as follows: a machine barrel: the first zone is 90-110 ℃, the second zone is 110-;
die head: 200 ℃ and 220 ℃.
As a further improvement of the invention, the barrel and die temperatures of the twin-screw extruder for extruding the sheet after pelletization were set as follows: a machine barrel: the first zone is 90-110 ℃, the second zone is 110-; die head: 200 ℃ and 220 ℃.
As a further improvement of the invention, the die head of the double-screw extruder for mixing and granulating comprises three zones, wherein the temperature of each zone is 200-220 ℃; the die of the twin-screw extruder, from which the sheet was extruded after pelletization, contained five zones, each of which had a temperature of 200 ℃ and 220 ℃.
As a further improvement of the invention, in step S1, the drying temperature is 85-95 ℃, and the drying time is 20-60 min; and in step S2, irradiating by an electron accelerator with the dose of 5-15M.
Compared with the prior art, the invention has the beneficial effects that:
researches show that the performance of the polypropylene base material which is not subjected to irradiation has direct influence on the physical performance of the final radiation crosslinking polypropylene heat-shrinkable belt material and the installation applicability of products. By adopting the technical scheme of the invention, the block copolymerization polypropylene is selected to be matched with a proper amount of metallocene polypropylene, high-density polyethylene, polyolefin block copolymer, random copolymerization polypropylene grafted maleic anhydride, high-density polyethylene, sensitizer and the like, so that the shrinkage rate, strength and other properties of the sheet are improved, the material still keeps higher shrinkage rate after radiation crosslinking, and simultaneously has higher mechanical strength (high tensile strength, high heat aging resistance and high elongation at break), and after radiation crosslinking, the requirement of high shrinkage rate can be met without a heating, stretching, orientation and cooling process, and various physical and chemical properties such as mechanical strength and the like can meet the standard requirement; and secondly, the production efficiency of the radiation crosslinking polypropylene base material is improved, and the energy consumption and equipment investment are reduced.
In addition, when the irradiation crosslinking polypropylene base material is installed and shrunk, compared with the traditional three-step polypropylene base material, the irradiation crosslinking polypropylene base material does not shrink locally and become narrow seriously, so that the heat-shrinkable belt has better appearance.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
Example 1
A radiation crosslinking polypropylene thermal shrinkage belt base material comprises the following material components in percentage by mass: 50% of block copolymer polypropylene (PPB); 12% of metallocene polypropylene (mPP); 16% High Density Polyethylene (HDPE); 10% of a polyolefin block copolymer (OBC); 2% of a sensitizer; 5% of maleic anhydride grafted random copolymer polypropylene (PPR-MAH); 0.5 percent of antioxidant; 1% of black master batch.
Wherein the melt flow index of the block copolymerization polypropylene is as follows: 1.0-10 g/10min, a melting point of 160-170 ℃, and the grade adopted in the embodiment is Shanghai Shihua M700R.
The metallocene polypropylene has a melt flow index of: 8-25 g/10min, the melting point is 140-150 ℃, and the brand adopted in the embodiment is RM5500 of Liandedserval.
The high density polyethylene has a melt flow index of: 0.3-5 g/10min, extrusion molding grade, and the grade adopted in the embodiment is Mitsui chemistry.
The maleic anhydride grafted random copolymer polypropylene is subjected to autonomous processing modification, the melt flow index of the random copolymer polypropylene selected in the embodiment is 3g/10min, the melting point is 140-150 ℃, and the maleic anhydride grafting rate is 0.8%.
The polyolefin block copolymer has a melt flow index of 1.0-15 g/10min, a melting point of 115-125 ℃, and the selected trademark of Dow Infuse 9100 in the embodiment.
The sensitizer is at least one of trifunctional acrylate or trifunctional allyl ester, and specifically can be: at least one of trimethylolpropane trimethacrylate (TMPTMA), trimethylolpropane triacrylate (TMPTA), triallyl cyanurate (TAC), triallyl isocyanurate (TAIC), etc., in which TMPTMA is used.
The antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant SKY-1035, and in the embodiment, the antioxidant 1010 is adopted.
The black master batch is a special black master batch for polyethylene sold in the market.
The preparation steps are as follows:
weighing the polypropylene heat-shrinkable tape substrate raw material according to the formula, mixing, feeding the uniformly mixed polypropylene heat-shrinkable tape substrate raw material into a feed opening of a double-screw extruder through a hopper, and melting, extruding and granulating according to the following processes to obtain the polypropylene heat-shrinkable tape substrate granulation material:
a machine barrel: a first region: 100 ± 10 ℃, second zone: 120 plus or minus 10 ℃; a third zone: 150 +/-10 ℃; a fourth area: 180 plus or minus 10 ℃; a fifth area: 190 +/-10 ℃; a sixth zone: 200 plus or minus 10 ℃; a seventh region: 210 +/-10 ℃; the eighth area is 210 +/-10 ℃;
die head: a first region: 210 +/-10 ℃; a second region: 210 +/-10 ℃; a third zone: 210 +/-10 ℃.
Then placing the polypropylene heat-shrinkable tape substrate granulation material into a dryer with the temperature of 90 ℃ for heating and drying moisture for 30 min.
Sheet extrusion is carried out on the granulated material, and the method specifically comprises the following steps: adding the dried polypropylene heat-shrinkable tape substrate granulation material into a feed opening of a double-screw extruder through a hopper, and carrying out melting, sheet extrusion, three-roller calendering, stretching, cooling and slitting according to the following processes to obtain the unirradiated polypropylene heat-shrinkable tape substrate with the thickness of 1.0-1.2 mm and the shrinkage of 50-65 percent:
a machine barrel: a first region: 100 ± 10 ℃, second zone: 120 plus or minus 10 ℃; a third zone: 150 +/-10 ℃; a fourth area: 180 plus or minus 10 ℃; a fifth area: 190 +/-10 ℃; a sixth zone: 200 plus or minus 10 ℃; a seventh region: 210 +/-10 ℃; the eighth area is 210 +/-10 ℃;
die head: a first region: 210 +/-10 ℃; a second region: 210 +/-10 ℃; a third zone: 210 +/-10 ℃; a fourth area: 210 +/-10 ℃; a fifth area: 210 +/-10 ℃.
And (3) irradiating and crosslinking the cut polypropylene heat-shrinkable belt base material by using an electron accelerator, wherein the radiation dose is 7M, and the irradiation-crosslinked polypropylene heat-shrinkable belt base material with the circumferential shrinkage rate of 25-40% and the axial shrinkage rate of less than 5% is obtained.
Example 2
A radiation crosslinking polypropylene thermal shrinkage belt base material comprises the following material components in percentage by mass: 60% of block copolymer polypropylene (PPB); metallocene polypropylene (mPP) 10%; 12% of High Density Polyethylene (HDPE); polyolefin block copolymer (OBC) 12%; 1.5% of a sensitizer; 3% of maleic anhydride grafted random copolymer polypropylene (PPR-MAH); 0.7 percent of antioxidant; 0.8 percent of black master batch.
In this embodiment, the block copolymer polypropylene is a block copolymer 3015, the metallocene polypropylene is MR10MX0 with a trade mark dadale, and the high density polyethylene is 5000S with a trade mark mitsui chemistry. The maleic anhydride grafted random copolymerization polypropylene is subjected to autonomous processing modification, and the melt flow index of the random copolymerization polypropylene is as follows: 3-10 g/10min, the melting point is 140-150 ℃, and the grafting rate of maleic anhydride is 1.0%. The polyolefin block copolymer is selected from the dow brand Infuse 9107. The sensitizer is trihydroxypropane triacrylate (TMPTA). The antioxidant is an antioxidant 1076. The black master batch is a special black master batch for polyethylene sold in the market.
The irradiation crosslinking polypropylene heat-shrinkable belt base material with the circumferential shrinkage rate of 25-40% and the axial shrinkage rate of less than 5% is prepared according to the preparation method of the embodiment 1.
Example 3
A radiation crosslinking polypropylene thermal shrinkage belt base material comprises the following material components in percentage by mass: 70% of block copolymer polypropylene (PPB), 8% of metallocene polypropylene (mPP), 8% of High Density Polyethylene (HDPE), 12% of polyolefin block copolymer (OBC), 1% of sensitizer, 2% of maleic anhydride grafted random copolymer polypropylene (PPR-MAH) and 0.5% of antioxidant; 0.5 percent of black master batch.
In this example, the block copolymer polypropylene was selected under the trade name "Kowning J340". The metallocene polypropylene is XM-7080S of Mitsui chemistry. The high-density polyethylene is extruded and adopts 5000s of Daqing petrochemical industry. The maleic anhydride grafted random copolymerization polypropylene is subjected to autonomous processing modification, and the melt flow index of the random copolymerization polypropylene is as follows: 3-10 g/10min, the melting point is 140-150 ℃, and the grafting rate of maleic anhydride is 1.5%. The polyolefin block copolymer was used in dow's Infuse 9500. The sensitizer is triallyl cyanurate (TAC). The antioxidant is an antioxidant SKY-1035. The black master batch is a special black master batch for polyethylene sold in the market.
The irradiation crosslinking polypropylene heat-shrinkable belt base material with the circumferential shrinkage rate of 25-40% and the axial shrinkage rate of less than 5% is prepared according to the preparation method of the embodiment 1.
Example 4
A radiation crosslinking polypropylene thermal shrinkage belt base material comprises the following material components in percentage by mass: 52 percent of block copolymer polypropylene (PPB), 13 percent of metallocene polypropylene (mPP), 20 percent of High Density Polyethylene (HDPE), 11 percent of polyolefin block copolymer (OBC), 1 percent of sensitizer, 2 percent of maleic anhydride grafted random copolymer polypropylene (PPR-MAH), 0.5 percent of antioxidant and 0.5 percent of black master batch.
In this embodiment, the block copolymer polypropylene is a block molding 3015. The metallocene polypropylene is MR10MX0 by Dadall. The high-density polyethylene adopts Liaoyang petrochemical PE-JA-57T 022. The maleic anhydride grafted random copolymerization polypropylene is subjected to autonomous processing modification, and the melt flow index of the random copolymerization polypropylene is as follows: 3-10 g/10min, the melting point is 140-150 ℃, and the grafting rate of maleic anhydride is 1.2%. The polyolefin block copolymer employs the dow infise 9530. The sensitizer is triallyl isocyanurate (TAIC). The antioxidant is antioxidant 1010. The black master batch is a special black master batch for polyethylene sold in the market.
The irradiation crosslinking polypropylene heat-shrinkable belt base material with the circumferential shrinkage rate of 25-40% and the axial shrinkage rate of less than 5% is prepared according to the preparation method of the embodiment 1.
Comparative example 1
On the basis of example 1, the formula of comparative example 1 is different from that of example 1 in that the material components and the mass percentages thereof are as follows: 70% of block copolymer polypropylene (PPB), 12% of High Density Polyethylene (HDPE), 12% of polyolefin block copolymer (OBC), 1.5% of sensitizer, 3% of maleic anhydride grafted random copolymer polypropylene (PPR-MAH), 0.7% of antioxidant and 0.8% of black master batch. The rest of the procedure was the same as in example 1.
Comparative example 2
On the basis of example 1, the formula of comparative example 2 is different from that of example 1 in that the material components and the mass percentages thereof are as follows: 65% of block copolymer polypropylene (PPB), 5% of metallocene polypropylene (mPP), 12% of High Density Polyethylene (HDPE), 12% of polyolefin block copolymer (OBC), 1.5% of sensitizer, 3% of maleic anhydride grafted random copolymer polypropylene (PPR-MAH), 0.7% of antioxidant and 0.8% of black master batch. The rest of the procedure was the same as in example 1.
Comparative example 3
The radiation crosslinking polypropylene heat-shrinkable belt base material obtained by the three-step method in the prior art can be purchased in the market.
The performance indexes and the test methods of the radiation crosslinked polypropylene heat-shrinkable tape base material according to the requirements of the industry and customers are shown in table 1.
TABLE 1 Performance index of radiation crosslinked polypropylene heat-shrinkable tape base material and test method
The above examples and comparative examples were tested according to the requirements of table 1 and the results are shown in table 2.
It can be seen from the comparison of the above examples and comparative examples that, by adopting the technical scheme of the examples of the present invention, each property can meet the requirements of the standard, and the performances in fire resistance and shrinkage uniformity are good, compared with the three-step method of the prior art, the shrinkage uniformity is far better than that of comparative example 3. With respect to the selection of the formulation components and the contents, the formulations of examples 1 to 4 have no bleeding and cracking on the surface in the fire resistance test compared with the formulations of comparative example 1 and comparative example 2, and the formulations of comparative example 1 and comparative example 2 have no bleeding and cracking on the surface, so that the formulations have better and unexpected effects compared with the comparative examples.
TABLE 2 comparison of the properties of the examples and comparative examples
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The radiation crosslinking polypropylene thermal shrinkage belt base material is characterized by comprising the following components in percentage by mass: 50-70% of block copolymer polypropylene, 7-15% of metallocene polypropylene, 8-20% of high-density polyethylene, 10-15% of polyolefin block copolymer, 1-2% of sensitizer, 2-5% of maleic anhydride grafted polypropylene, 0.5-1% of antioxidant and 0.5-1% of color master batch, wherein the sum of the mass percentages of the components is 100%.
2. The radiation crosslinked polypropylene heat-shrinkable tape base material according to claim 1, which is characterized by comprising the following components in percentage by mass: 55-65% of block copolymer polypropylene, 8-12% of metallocene polypropylene, 10-15% of high-density polyethylene, 11-14% of polyolefin block copolymer, 1.2-1.8% of sensitizer, 2.5-4% of maleic anhydride grafted polypropylene, 0.5-1% of antioxidant and 0.5-1% of color master batch, wherein the sum of the mass percentages of the components is 100%.
3. The radiation crosslinked polypropylene heat shrinkable tape substrate according to claim 1, wherein: the melt flow index of the block copolymerization polypropylene is 1.0-10 g/10min, and the melting point is 160-170 ℃; the melt flow index of the metallocene polypropylene is 8-25 g/10min, and the melting point is 140-150 ℃; the high-density polyethylene has a melt flow index of 0.3-5 g/10 min.
4. The radiation crosslinked polypropylene heat shrinkable tape substrate according to claim 3, wherein: the maleic anhydride grafted polypropylene is maleic anhydride grafted random copolymer polypropylene, wherein the grafting rate of maleic anhydride grafting is 0.8-1.5%.
5. The radiation crosslinked polypropylene heat shrinkable tape substrate according to claim 4, wherein: the melt flow index of the random copolymerization polypropylene is 3-10 g/10min, and the melting point is 140-150 ℃.
6. The radiation crosslinked polypropylene heat shrinkable tape substrate according to claim 4, wherein: the melt flow index of the polyolefin block copolymer is 1.0-15 g/10min, and the melting point is 115-125 ℃.
7. The radiation crosslinked polypropylene heat shrinkable tape substrate according to claim 6, wherein: the sensitizer is at least one of trimethylolpropane trimethacrylate (TMPTMA), trimethylolpropane triacrylate (TMPTA), triallyl cyanurate (TAC) or triallyl isocyanurate (TAIC);
the antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant SKY-1035.
8. The method for preparing a radiation crosslinked polypropylene heat-shrinkable tape substrate as claimed in any one of claims 1 to 7, wherein: which comprises the following steps:
step S1, weighing the raw materials according to a formula, mixing, uniformly mixing, putting into a double-screw extruder for melting, extruding and granulating to obtain polypropylene heat-shrinkable belt substrate granules, drying the polypropylene heat-shrinkable belt substrate granules, melting by the double-screw extruder, extruding sheets, calendering, stretching and cooling to obtain the non-irradiated polypropylene heat-shrinkable belt substrate with the shrinkage of 50-65%;
and step S2, carrying out irradiation crosslinking on the polypropylene heat-shrinkable belt base material which is not irradiated to obtain the irradiation crosslinked polypropylene heat-shrinkable belt base material with the circumferential shrinkage rate of 25-40% and the axial shrinkage rate of less than 5%.
9. The method for preparing a radiation crosslinked polypropylene heat-shrinkable tape substrate according to claim 8, characterized in that: in step S1, the barrel and die temperatures of the twin-screw extruder for mixing and granulating were set as follows:
a machine barrel: the first zone is 90-110 ℃, the second zone is 110-;
die head: 200 ℃ and 220 ℃;
the barrel and die temperatures of the twin-screw extruder for extruding the sheets after granulation were set as follows:
a machine barrel: the first zone is 90-110 ℃, the second zone is 110-;
die head: 200 ℃ and 220 ℃.
10. The method for preparing a radiation crosslinked polypropylene heat-shrinkable tape substrate according to claim 9, characterized in that: in step S1, drying at 85-95 deg.C for 20-60 min; and in step S2, irradiating by an electron accelerator with the dose of 5-15M.
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| CN116715921A (en) * | 2023-06-16 | 2023-09-08 | 江苏宝力泰新材料科技有限公司 | Blending crosslinking-based high-temperature heat-resistant shrinkage material and preparation method thereof |
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| US6569915B1 (en) * | 2000-10-16 | 2003-05-27 | Shawcor Ltd. | Crosslinked, heat shrinkable polypropylene compositions |
| CN103589059A (en) * | 2013-10-28 | 2014-02-19 | 江苏达胜热缩材料有限公司 | Radiation crosslinking polypropylene heat shrinkable belt base material |
| CN111154416A (en) * | 2020-01-16 | 2020-05-15 | 长园长通新材料股份有限公司 | Radiation crosslinking polypropylene thermal shrinkage belt for submarine pipeline anticorrosion joint and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6569915B1 (en) * | 2000-10-16 | 2003-05-27 | Shawcor Ltd. | Crosslinked, heat shrinkable polypropylene compositions |
| CN103589059A (en) * | 2013-10-28 | 2014-02-19 | 江苏达胜热缩材料有限公司 | Radiation crosslinking polypropylene heat shrinkable belt base material |
| CN111154416A (en) * | 2020-01-16 | 2020-05-15 | 长园长通新材料股份有限公司 | Radiation crosslinking polypropylene thermal shrinkage belt for submarine pipeline anticorrosion joint and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116715921A (en) * | 2023-06-16 | 2023-09-08 | 江苏宝力泰新材料科技有限公司 | Blending crosslinking-based high-temperature heat-resistant shrinkage material and preparation method thereof |
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