Halogen-free flame-retardant copper-plastic composite tape and preparation method thereof

Abstract

The application belongs to the technical field of copper-plastic composite tape, and provides a halogen-free flame-retardant copper-plastic composite tape and a preparation method thereof.The copper-plastic composite tape comprises a copper tape layer and a plastic film layer wrapped outside the copper tape layer, and the plastic film layer comprises the following raw materials: polyester, halogen-free flame retardant, modified nanometer iceberg stone, modified polyvinyl alcohol, antioxidant, toughening agent and lubricant.The halogen-free flame-retardant copper-plastic composite tape provided by the application improves the flame retardance of the plastic film layer by adding halogen-free flame retardant in the plastic film layer, has good flame retardance and high-temperature resistance by adding modified nanometer iceberg stone, has good mechanical properties and thermal stability of the plastic film layer by making the nanometer iceberg stone uniformly dispersed in nanometer level, improves the flame retardance by adding modified polyvinyl alcohol, and forms a macromolecular network structure by the reaction between the modified polyvinyl alcohol, the halogen-free flame retardant and other components, so that the plastic film layer has a stable internal structure and improved mechanical properties.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of copper-plastic composite belts, and particularly relates to a halogen-free flame-retardant copper-plastic composite belt and a preparation method thereof. BACKGROUND

[0002] The copper-plastic composite belt is a substitute product of a pure copper belt for cables and is one of important varieties in modern copper processing materials. The application in the communication cable and communication optical cable industries is continuously increasing.

[0003] In order to save copper resources and reduce costs, the copper-plastic composite belt is generally thinned as much as possible, which reduces the total thickness of the copper-plastic composite belt and causes the strength to decrease, so that the increasingly high strength requirement of the copper-plastic composite belt cannot be met. SUMMARY

[0004] The application provides a halogen-free flame-retardant copper-plastic composite belt, which aims to solve the above problems.

[0005] The application is implemented as follows: a halogen-free flame-retardant copper-plastic composite belt comprises a copper belt layer and a plastic film layer wrapped outside the copper belt layer, the thickness of the copper belt layer is 0.1-0.2 mm, the thickness of the plastic film layer is 0.04-0.05 mm, the plastic film layer is combined with the copper belt layer through an adhesive, the adhesive comprises hot melt adhesive, and the plastic film layer comprises the following raw materials in parts by weight: polyester 90-110 parts, halogen-free flame retardant 2-4 parts, modified nanocryolite 4-8 parts, modified polyvinyl alcohol 8-12 parts, antioxidant 1-3 parts, toughening agent 1-2 parts, and lubricant 1-2 parts.

[0006] Preferably, the plastic film layer comprises the following raw materials in parts by weight: polyester 95-105 parts, halogen-free flame retardant 2.5-3.5 parts, modified nanocryolite 5-7 parts, modified polyvinyl alcohol 9-11 parts, antioxidant 1.5-2.5 parts, toughening agent 1.2-1.8 parts, and lubricant 1.3-1.6 parts.

[0007] Preferably, the plastic film layer comprises the following raw materials in parts by weight: polyester 100 parts, halogen-free flame retardant 3 parts, modified nanocryolite 6 parts, modified polyvinyl alcohol 10 parts, antioxidant 2 parts, toughening agent 1.5 parts, and lubricant 1.5 parts.

[0008] Preferably, the halogen-free flame retardant comprises one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide and aluminum hydroxide.

[0009] Preferably, the modified nano-Icelandite is prepared as follows: 30-40 parts by weight of nano-Icelandite are weighed and added to 12-16 times their weight of water. 2-3% sodium phosphate by weight of the nano-Icelandite is added, and the mixture is stirred at 70-90°C for 30-50 minutes, then filtered and dehydrated to obtain product A. Then, product A is mixed with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water, stirred for 40-60 minutes, and then 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether are added. The mixture is ultrasonically treated with 40-60MHz ultrasound for 20-30 minutes, filtered, and dried to obtain modified nano-Icelandite. Iceland spar has good flame retardant properties and high-temperature resistance. By adding sodium phosphate, the chemical precipitation of phosphate ions on the surface of nano-Icelandite increases its specific surface area, enabling it to adsorb more halogen-free flame retardants.

[0010] Preferably, the modified polyvinyl alcohol is prepared as follows: 20-30 parts by weight of polyvinyl alcohol are weighed and dissolved in 4-8 times their weight of deionized water. The solution is heated to 90°C in a water bath and stirred at 200-300 r / min for 30-50 min. Then, 4-6% sodium alginate by weight of polyvinyl alcohol is added to the polyvinyl alcohol solution, and stirring is continued for 30-40 min. 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine are added, and the solution is heated to 80-90°C and stirred for 4-8 h. The solution is extracted with dichloromethane, precipitated with anhydrous diethyl ether, and vacuum dried to obtain modified polyvinyl alcohol. By treating polyvinyl alcohol, amino groups are grafted onto the ends of the polyvinyl alcohol to enhance its reactivity. When compounded with halogen-free flame retardants and other materials, the flame retardant ability is improved, and the reaction between them forms a macromolecular network structure, giving the plastic film layer a stable internal structure and improving its mechanical properties.

[0011] Preferably, the antioxidant includes one or more combinations of dilaurate thiodipropionate, antioxidant T501, and antioxidant 1010.

[0012] Preferably, the toughening agent comprises one or more combinations of ethylcarboxylated rubber copolymer and styrene-butadiene-styrene block copolymer.

[0013] Preferably, the lubricant includes at least one of polyethylene wax and silicone oil.

[0014] The present invention also provides a method for preparing the above-mentioned halogen-free flame-retardant copper-plastic composite tape, comprising the following steps:

[0015] Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer;

[0016] The copper strip layer is soaked in the adhesive.

[0017] The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 90-110℃, with a bonding pressure of 80-100N.

[0018] The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 10-15 m / min and the tension of the copper-plastic composite strip is controlled at 3-5 N.

[0019] Compared with the prior art, the embodiments of this application have the following main advantages:

[0020] The halogen-free flame-retardant copper-plastic composite tape provided by this invention improves the flame retardancy of the plastic film layer by adding a halogen-free flame retardant. By adding modified nano-Icelandic stone, it has good flame retardant properties and high temperature resistance, and is uniformly dispersed at the nanoscale, giving the plastic film layer good mechanical properties and thermal stability. By adding modified polyvinyl alcohol, it is compounded with the halogen-free flame retardant and other components to improve the flame retardancy and react with each other to form a macromolecular network structure, giving the plastic film layer a stable internal structure and improving its mechanical properties. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the preparation process of a halogen-free flame-retardant copper-plastic composite tape provided by the present invention. Detailed Implementation

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Example 1

[0025] This invention provides a halogen-free flame-retardant copper-plastic composite tape, such as... Figure 1As shown, it includes a copper strip layer and a plastic film layer covering the copper strip layer. The copper strip layer has a thickness of 0.2 mm, and the plastic film layer has a thickness of 0.05 mm. The plastic film layer is bonded to the copper strip layer with an adhesive, which is a hot melt adhesive. The plastic film layer comprises the following raw materials in parts by weight: 90-110 parts polyester, 2-4 parts halogen-free flame retardant, 4-8 parts modified nano-Icelandic ore, 8-12 parts modified polyvinyl alcohol, 1-3 parts antioxidant, 1-2 parts toughening agent, and 1-2 parts lubricant. Figure 1 As shown, the preparation method of the halogen-free flame-retardant copper-plastic composite tape is as follows:

[0026] Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer;

[0027] The copper strip layer is soaked in the adhesive.

[0028] The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 90°C with a bonding pressure of 80N.

[0029] The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 10 m / min and the tension of the copper-plastic composite strip is controlled at 3 N.

[0030] The halogen-free flame retardant includes one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide, and aluminum hydroxide; the antioxidant includes one or more combinations of dilauryl thiodipropionate, antioxidant T501, and antioxidant 1010; the toughening agent includes one or more combinations of ethylcarboxylated rubber copolymer and styrene-butadiene-styrene block copolymer; and the lubricant includes at least one of polyethylene wax and silicone oil.

[0031] Specifically, the preparation method of the modified nano-Icelandite is as follows: Weigh 30-40 parts of nano-Icelandite by weight, add 12-16 times the weight of water, add 2-3% sodium phosphate by weight of nano-Icelandite, stir at 70-90℃ for 30-50 min, filter and dehydrate to obtain product A; then mix product A with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water for 40-60 min, then add 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether, sonicate with 40-60MHz ultrasound for 20-30 min, filter and dry to obtain modified nano-Icelandite.

[0032] In this embodiment, the modified polyvinyl alcohol is prepared as follows: 20-30 parts by weight of polyvinyl alcohol are weighed and dissolved in 4-8 times their weight of deionized water. The solution is heated to 90°C in a water bath and stirred at 200-300 r / min for 30-50 min. Then, 4-6% sodium alginate by weight of polyvinyl alcohol is added to the polyvinyl alcohol solution, and stirring is continued for 30-40 min. 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine are added, and the solution is heated to 80-90°C and stirred for 4-8 h. The solution is extracted with dichloromethane, precipitated with anhydrous diethyl ether, and dried under vacuum to obtain the modified polyvinyl alcohol.

[0033] Example 2

[0034] This invention provides a halogen-free flame-retardant copper-plastic composite tape, such as... Figure 1 As shown, it includes a copper strip layer and a plastic film layer covering the copper strip layer. The copper strip layer has a thickness of 0.2 mm, and the plastic film layer has a thickness of 0.05 mm. The plastic film layer is bonded to the copper strip layer with an adhesive, which is a hot melt adhesive. The plastic film layer comprises the following raw materials in parts by weight: 95-105 parts polyester, 2.5-3.5 parts halogen-free flame retardant, 5-7 parts modified nano-Icelandic ore, 9-11 parts modified polyvinyl alcohol, 1.5-2.5 parts antioxidant, 1.2-1.8 parts toughening agent, and 1.3-1.6 parts lubricant. Figure 1 As shown, the preparation method of the halogen-free flame-retardant copper-plastic composite tape is as follows:

[0035] Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer;

[0036] The copper strip layer is soaked in the adhesive.

[0037] The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 90°C with a bonding pressure of 80N.

[0038] The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 10 m / min and the tension of the copper-plastic composite strip is controlled at 3 N.

[0039] The halogen-free flame retardant includes one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide, and aluminum hydroxide; the antioxidant includes one or more combinations of dilauryl thiodipropionate, antioxidant T501, and antioxidant 1010; the toughening agent includes one or more combinations of ethylcarboxylated rubber copolymer and styrene-butadiene-styrene block copolymer; and the lubricant includes at least one of polyethylene wax and silicone oil.

[0040] Specifically, the preparation method of the modified nano-Icelandite is as follows: Weigh 30-40 parts of nano-Icelandite by weight, add 12-16 times the weight of water, add 2-3% sodium phosphate by weight of nano-Icelandite, stir at 70-90℃ for 30-50 min, filter and dehydrate to obtain product A; then mix product A with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water for 40-60 min, then add 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether, sonicate with 40-60MHz ultrasound for 20-30 min, filter and dry to obtain modified nano-Icelandite.

[0041] In this embodiment, the modified polyvinyl alcohol is prepared as follows: 20-30 parts by weight of polyvinyl alcohol are weighed and dissolved in 4-8 times their weight of deionized water. The solution is heated to 90°C in a water bath and stirred at 200-300 r / min for 30-50 min. Then, 4-6% sodium alginate by weight of polyvinyl alcohol is added to the polyvinyl alcohol solution, and stirring is continued for 30-40 min. 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine are added, and the solution is heated to 80-90°C and stirred for 4-8 h. The solution is extracted with dichloromethane, precipitated with anhydrous diethyl ether, and dried under vacuum to obtain the modified polyvinyl alcohol.

[0042] Example 3

[0043] This invention provides a halogen-free flame-retardant copper-plastic composite tape, such as... Figure 1 As shown, it includes a copper strip layer and a plastic film layer covering the copper strip layer. The copper strip layer has a thickness of 0.2 mm, and the plastic film layer has a thickness of 0.05 mm. The plastic film layer is bonded to the copper strip layer with an adhesive, which is a hot melt adhesive. The plastic film layer comprises the following raw materials in parts by weight: polyester 100, 3 parts of halogen-free flame retardant, 6 parts of modified nano-Icelandic stone, 10 parts of modified polyvinyl alcohol, 2 parts of antioxidant, 1.5 parts of toughening agent, and 1.5 parts of lubricant. Figure 1 As shown, the preparation method of the halogen-free flame-retardant copper-plastic composite tape is as follows:

[0044] Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer;

[0045] The copper strip layer is soaked in the adhesive.

[0046] The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 100°C with a bonding pressure of 90N.

[0047] The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 12 m / min and the tension of the copper-plastic composite strip is controlled at 4 N.

[0048] The halogen-free flame retardant includes one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide, and aluminum hydroxide; the antioxidant includes one or more combinations of dilauryl thiodipropionate, antioxidant T501, and antioxidant 1010; the toughening agent includes one or more combinations of ethylcarboxylated rubber copolymer and styrene-butadiene-styrene block copolymer; and the lubricant includes at least one of polyethylene wax and silicone oil.

[0049] Specifically, the preparation method of the modified nano-Icelandite is as follows: Weigh 30-40 parts of nano-Icelandite by weight, add 12-16 times the weight of water, add 2-3% sodium phosphate by weight of nano-Icelandite, stir at 70-90℃ for 30-50 min, filter and dehydrate to obtain product A; then mix product A with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water for 40-60 min, then add 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether, sonicate with 40-60MHz ultrasound for 20-30 min, filter and dry to obtain modified nano-Icelandite.

[0050] In this embodiment, the modified polyvinyl alcohol is prepared as follows: 20-30 parts by weight of polyvinyl alcohol are weighed and dissolved in 4-8 times their weight of deionized water. The solution is heated to 90°C in a water bath and stirred at 200-300 r / min for 30-50 min. Then, 4-6% sodium alginate by weight of polyvinyl alcohol is added to the polyvinyl alcohol solution, and stirring is continued for 30-40 min. 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine are added, and the solution is heated to 80-90°C and stirred for 4-8 h. The solution is extracted with dichloromethane, precipitated with anhydrous diethyl ether, and dried under vacuum to obtain the modified polyvinyl alcohol.

[0051] Example 4

[0052] This invention provides a halogen-free flame-retardant copper-plastic composite tape, such as... Figure 1 As shown, it includes a copper strip layer and a plastic film layer covering the copper strip layer. The copper strip layer has a thickness of 0.2 mm, and the plastic film layer has a thickness of 0.05 mm. The plastic film layer is bonded to the copper strip layer with an adhesive, which is a hot melt adhesive. The plastic film layer comprises the following raw materials in parts by weight: 95-105 parts polyester, 2.5-3.5 parts halogen-free flame retardant, 5-7 parts modified nano-Icelandic ore, 9-11 parts modified polyvinyl alcohol, 1.5-2.5 parts antioxidant, 1.2-1.8 parts toughening agent, and 1.3-1.6 parts lubricant. Figure 1 As shown, the preparation method of the halogen-free flame-retardant copper-plastic composite tape is as follows:

[0053] Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer;

[0054] The copper strip layer is soaked in the adhesive.

[0055] The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 110°C with a bonding pressure of 100N.

[0056] The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 15 m / min and the tension of the copper-plastic composite strip is controlled at 5 N.

[0057] The halogen-free flame retardant includes one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide, and aluminum hydroxide; the antioxidant includes one or more combinations of dilauryl thiodipropionate, antioxidant T501, and antioxidant 1010; the toughening agent includes one or more combinations of ethylcarboxylated rubber copolymer and styrene-butadiene-styrene block copolymer; and the lubricant includes at least one of polyethylene wax and silicone oil.

[0058] Specifically, the preparation method of the modified nano-Icelandite is as follows: Weigh 30-40 parts of nano-Icelandite by weight, add 12-16 times the weight of water, add 2-3% sodium phosphate by weight of nano-Icelandite, stir at 70-90℃ for 30-50 min, filter and dehydrate to obtain product A; then mix product A with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water for 40-60 min, then add 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether, sonicate with 40-60MHz ultrasound for 20-30 min, filter and dry to obtain modified nano-Icelandite.

[0059] In this embodiment, the modified polyvinyl alcohol is prepared as follows: 20-30 parts by weight of polyvinyl alcohol are weighed and dissolved in 4-8 times their weight of deionized water. The solution is heated to 90°C in a water bath and stirred at 200-300 r / min for 30-50 min. Then, 4-6% sodium alginate by weight of polyvinyl alcohol is added to the polyvinyl alcohol solution, and stirring is continued for 30-40 min. 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine are added, and the solution is heated to 80-90°C and stirred for 4-8 h. The solution is extracted with dichloromethane, precipitated with anhydrous diethyl ether, and dried under vacuum to obtain the modified polyvinyl alcohol.

[0060] Example 5

[0061] This invention provides a halogen-free flame-retardant copper-plastic composite tape, such as... Figure 1As shown, it includes a copper strip layer and a plastic film layer covering the copper strip layer. The copper strip layer has a thickness of 0.2 mm, and the plastic film layer has a thickness of 0.05 mm. The plastic film layer is bonded to the copper strip layer with an adhesive, which is a hot melt adhesive. The plastic film layer comprises the following raw materials in parts by weight: 90-110 parts polyester, 2-4 parts halogen-free flame retardant, 4-8 parts modified nano-Icelandic ore, 8-12 parts modified polyvinyl alcohol, 1-3 parts antioxidant, 1-2 parts toughening agent, and 1-2 parts lubricant. Figure 1 As shown, the preparation method of the halogen-free flame-retardant copper-plastic composite tape is as follows:

[0062] Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer;

[0063] The copper strip layer is soaked in the adhesive.

[0064] The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 110°C with a bonding pressure of 100N.

[0065] The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 15 m / min and the tension of the copper-plastic composite strip is controlled at 5 N.

[0066] The halogen-free flame retardant includes one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide, and aluminum hydroxide; the antioxidant includes one or more combinations of dilauryl thiodipropionate, antioxidant T501, and antioxidant 1010; the toughening agent includes one or more combinations of ethylcarboxylated rubber copolymer and styrene-butadiene-styrene block copolymer; and the lubricant includes at least one of polyethylene wax and silicone oil.

[0067] Specifically, the preparation method of the modified nano-Icelandite is as follows: Weigh 30-40 parts of nano-Icelandite by weight, add 12-16 times the weight of water, add 2-3% sodium phosphate by weight of nano-Icelandite, stir at 70-90℃ for 30-50 min, filter and dehydrate to obtain product A; then mix product A with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water for 40-60 min, then add 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether, sonicate with 40-60MHz ultrasound for 20-30 min, filter and dry to obtain modified nano-Icelandite.

[0068] In this embodiment, the modified polyvinyl alcohol is prepared as follows: 20-30 parts by weight of polyvinyl alcohol are weighed and dissolved in 4-8 times their weight of deionized water. The solution is heated to 90°C in a water bath and stirred at 200-300 r / min for 30-50 min. Then, 4-6% sodium alginate by weight of polyvinyl alcohol is added to the polyvinyl alcohol solution, and stirring is continued for 30-40 min. 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine are added, and the solution is heated to 80-90°C and stirred for 4-8 h. The solution is extracted with dichloromethane, precipitated with anhydrous diethyl ether, and dried under vacuum to obtain the modified polyvinyl alcohol.

[0069] Comparative Example 1

[0070] The difference from Example 3 is that the modified nano Iceland spar is replaced with ordinary nano Iceland spar.

[0071] Comparative Example 2

[0072] The difference from Example 3 is that the modified polyvinyl alcohol is replaced with ordinary polyvinyl alcohol.

[0073] Comparative Example 3

[0074] The difference from Example 3 is that the modified nano Iceland spar is replaced with ordinary nano Iceland spar and the modified polyvinyl alcohol is replaced with ordinary polyvinyl alcohol.

[0075] Comparative Example 4

[0076] A commercially available halogen-free flame-retardant copper-plastic composite belt.

[0077] experiment

[0078] The copper-plastic composite strips of Examples 1-5 and Comparative Examples 1-4 were tested for tensile strength, elongation at break, and peel strength. The experimental results are shown in Table 1 below:

[0079]

[0080] The results above show that the halogen-free flame-retardant copper-plastic composite tape provided by the present invention has good mechanical properties. In particular, by adding modified nano-Icelandic stone and modified polyvinyl alcohol to the plastic protective layer, it has a synergistic effect and can further improve tensile strength and elongation at break.

[0081] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions are also within the scope of protection of the present invention.

Claims

1. A halogen-free flame-retardant copper-plastic composite strip, characterized in that, It includes a copper strip layer and a plastic film layer covering the outside of the copper strip layer. The plastic film layer includes the following raw materials in parts by weight: 90-110 parts polyester, 2-4 parts halogen-free flame retardant, 4-8 parts modified nano Iceland spar, 8-12 parts modified polyvinyl alcohol, 1-3 parts antioxidant, 1-2 parts toughening agent, and 1-2 parts lubricant. The modified nano-Icelandite is prepared as follows: Weigh 30-40 parts by weight of nano-Icelandite, add 12-16 times its weight of water, add 2-3% sodium phosphate by weight of nano-Icelandite, stir at 70-90℃ for 30-50 min, filter and dehydrate to obtain product A; then mix product A with 3-7 parts of hexadecyltrimethylammonium bromide and 20-30 parts of water for 40-60 min, add 4-8 parts of chitosan and 0.5-1 parts of ethylene glycol diglycidyl ether, sonicate with 40-60MHz ultrasound for 20-30 min, filter and dry to obtain modified nano-Icelandite; The modified polyvinyl alcohol is prepared as follows: Weigh 20-30 parts of polyvinyl alcohol by weight, dissolve it in 4-8 times its weight of deionized water, heat it in a water bath to 90°C, stir it at 200-300 r / min for 30-50 min, then add 4-6% sodium alginate by weight of polyvinyl alcohol to the polyvinyl alcohol solution, continue stirring for 30-40 min, add 2-4 parts of 3-amino-1,2-propanediol and 4-8 parts of diethylamine, heat it to 80-90°C and stir for 4-8 h, extract it with dichloromethane, precipitate it with anhydrous diethyl ether, and dry it under vacuum to obtain modified polyvinyl alcohol.

2. The halogen-free flame-retardant copper-plastic composite strip as described in claim 1, characterized in that, The plastic film layer comprises the following raw materials in parts by weight: 95-105 parts polyester, 2.5-3.5 parts halogen-free flame retardant, 5-7 parts modified nano Iceland spar, 9-11 parts modified polyvinyl alcohol, 1.5-2.5 parts antioxidant, 1.2-1.8 parts toughening agent, and 1.3-1.6 parts lubricant.

3. The halogen-free flame-retardant copper-plastic composite strip as described in claim 2, characterized in that, The plastic film layer comprises the following raw materials in parts by weight: 100 parts polyester, 3 parts halogen-free flame retardant, 6 parts modified nano Iceland spar, 10 parts modified polyvinyl alcohol, 2 parts antioxidant, 1.5 parts toughening agent, and 1.5 parts lubricant.

4. The halogen-free flame-retardant copper-plastic composite tape as described in claim 1, characterized in that, The halogen-free flame retardant includes one or more combinations of sodium polyacrylate, polypropylene carbonate, magnesium hydroxide, and aluminum hydroxide.

5. The halogen-free flame-retardant copper-plastic composite strip as described in claim 1, characterized in that, The antioxidants include one or more combinations of dilaurate thiodipropionate, antioxidant T501, and antioxidant 1010.

6. The halogen-free flame-retardant copper-plastic composite strip as described in claim 1, characterized in that, The toughening agent includes one or more combinations of ethylcarboxylated rubber copolymers and styrene-butadiene-styrene block copolymers.

7. The halogen-free flame-retardant copper-plastic composite tape as described in claim 1, characterized in that, The lubricant includes at least one of polyethylene wax and silicone oil.

8. The method for preparing the halogen-free flame-retardant copper-plastic composite tape according to any one of claims 1-7, characterized in that, Includes the following steps: Weigh the raw materials for the plastic film layer according to the formula, mix the raw materials for the plastic film layer, extrude and granulate, dry, melt and plasticize through a film extruder, extrude and cast, calender and cool to obtain the plastic film layer; The copper strip layer is soaked in the adhesive. The copper strip layer impregnated with adhesive is thermally bonded to the plastic film layer at 90-110℃, with a bonding pressure of 80-100N. The copper-plastic composite strip that has undergone composite rolling is wound up at a speed of 10-15 m / min and the tension of the copper-plastic composite strip is controlled at 3-5 N.

Images