Preformed orifice hose and method of making same

Abstract

The application discloses a prefabricated hole water hose and a preparation method thereof, and relates to the technical field of agricultural water-saving irrigation equipment. The prefabricated hole water hose comprises a water hose base body and prefabricated hole units which are uniformly distributed along the length direction of the water hose base body. The water hose base body comprises, from inside to outside, an inner film layer, a bonding layer, a woven layer and a functional protective coating layer. The inner film layer is made of a PE-based inner film or a TPU inner film. The PE-based film is compounded by hot melt adhesive and PE blend at a mass ratio of 3:7. The PE blend is blended by LLDPE, POE and HDPE at a mass ratio of 10:1:1. The prefabricated hole unit is integrated with a TPU bionic valve. The prefabricated hole water hose has the advantages of high strength, high flexibility, uniform water outlet, stable structure, long service life and high preparation efficiency.

Description

Technical Field

[0001] This invention relates to the field of agricultural water-saving irrigation equipment technology, and in particular to a pre-perforated water belt and its preparation method. Background Technology

[0002] Currently, with the increasing scarcity of global water resources, efficient water-saving irrigation technologies are widely used in modern agriculture. Among these, pre-perforated drip irrigation tape has become one of the mainstream products due to its advantages such as water saving, fertilizer saving, and increased yield. The mainstream products on the market are represented by Netafim from Israel, which uses a polyethylene (PE) co-extruded blown film + woven fabric reinforcement structure, forming a central seam connection through heat sealing, and then laser perforation to achieve uniform water output. However, such products have technical defects such as weak central seams, making them prone to cracking under high pressure; insufficient adhesion between the inner film and the outer woven layer, leading to delamination after long-term use; and poor flexibility of conventional PE materials, making them brittle and prone to breakage in low-temperature environments, affecting their adaptability to installation.

[0003] For example, invention patent CN118844307A discloses a pre-perforated hose, comprising: an inner hose layer, which is a pipe structure made of black polyethylene film; an outer hose layer, which is a white polyethylene braided layer, is glued to the outer wall of the inner hose layer; the inner and outer hose layers are concentrically nested, and their surfaces are equidistantly connected by pre-made buckles. This pre-perforated hose and its production equipment utilize an electric drive turntable and a laser drill to form a corresponding laser drilling structure. During hose production, adhesive sprayed onto the surface of the inner hose layer from the nozzle at the top of the positioning ring is used to bond the outer hose layer wrapped around the outer wall of the inner hose layer, giving the hose a two-layer structure. Controlled by an electrical signal and guided by an extrusion mold, the gap between the perforated positions of the inner and outer hose layers is relatively uniform and precise. However, its overall flexibility improvement is limited, and it is prone to breakage, especially during winter construction.

[0004] It is evident that developing a pre-perforated water hose with high strength, high flexibility, good water output uniformity, and long service life, as well as its preparation method, is of great practical significance. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a pre-perforated water hose and its preparation method. The pre-perforated water hose has high strength, high flexibility, uniform water output, stable structure, long service life and high preparation efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a pre-perforated water hose, comprising a water hose substrate and pre-perforated hole units uniformly distributed along the length of the water hose substrate; the water hose substrate comprises, from the inside out, an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating; the inner membrane layer is made of a PE-based inner membrane or a TPU inner membrane; the PE-based membrane is compounded from hot melt adhesive and a PE blend at a mass ratio of 3:7; the PE blend is compounded from LLDPE, POE, and HDPE at a mass ratio of 10:1:1.

[0007] Preferably, the LLDPE is LLDPE 7042; the POE is Dow 8003 POE; and the HDPE is HTA108HDPE.

[0008] Preferably, the hot melt adhesive is made from the following raw materials in parts by weight: 60-70 parts matrix, 20-30 parts tackifying resin, 5-7 parts plasticizer, 1-3 parts antioxidant, and 1-3 parts lubricant.

[0009] Preferably, the matrix is ​​a polyolefin elastomer; the polyolefin elastomer is Dow Engage. ™ 8150.

[0010] Preferably, the tackifying resin is C5 petroleum resin; the C5 petroleum resin is ExxonMobil Escorez. ™ 1102.

[0011] Preferably, the plasticizer is epoxidized soybean oil.

[0012] Preferably, the antioxidant is a hindered phenolic antioxidant; the hindered phenolic antioxidant is BASF Irganox. ® 1010.

[0013] Preferably, the lubricant is calcium stearate.

[0014] Preferably, the TPU inner membrane is made of BASF 1185A TPU.

[0015] Preferably, the adhesive layer is made of the following raw materials in parts by weight: 80-90 parts of polar base adhesive, 4-6 parts of silane crosslinking agent, 3-5 parts of tackifier, 0.8-1.2 parts of wetting agent, 1.5-2.5 parts of curing agent, 0.4-0.6 parts of antifreeze agent, 0.4-0.6 parts of defoamer, and 0.1-0.2 parts of catalyst.

[0016] Preferably, the polar main adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte. ™S115; The wetting agent is a nonionic surfactant, Triton. ™ X-100; the curing agent is the water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate.

[0017] Preferably, the braided layer is woven from polypropylene filaments; the linear density of the polypropylene filaments is 2000D.

[0018] Preferably, the functional protective coating is made from the following raw materials in parts by weight: 60-70 parts of waterborne polyurethane dispersion, 2-4 parts of waterborne blocked isocyanate curing agent, 8-12 parts of self-healing microcapsules, 5-8 parts of nano silica, 2-4 parts of anti-aging agent, 1-3 parts of dispersant, 3-5 parts of film-forming aid, 0.8-1.2 parts of polyether-modified silicone defoamer DC-65, 2-4 parts of thickener, and 0.1-0.3 parts of dibutyltin dilaurate.

[0019] Preferably, the aqueous polyurethane dispersion is Bayhydrol. ® UH240; the water-based blocked isocyanate curing agent is Bayhydur. ® Ultra 305; the source of the self-healing microcapsules is not particularly required. In one embodiment of the present invention, the self-healing microcapsules are prepared according to the microcapsule preparation method in Embodiment 2-1 of the invention patent with authorization announcement number CN116510636B; the average particle size of the nano-silica is 15nm, and the grade is AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a mass ratio of 1:1; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; and the thickener is hydroxyethyl cellulose with a molecular weight of 250,000.

[0020] Preferably, the pre-fabricated perforated unit integrates a TPU bionic valve.

[0021] Another object of the present invention is to provide a method for preparing the pre-perforated water strip, comprising the following steps: Step S1, film blowing: After mixing hot melt adhesive and PE blend in a certain proportion, blow film is obtained by using a twin-single screw blown film machine at a blowing temperature of 160-200℃ and a blow-up ratio of 1.5-2.5 to obtain a PE-based inner film; BASF 1185A TPU is blown film by using a twin-single screw blown film machine at a blowing temperature of 180-210℃ and a blow-up ratio of 1.5-2.5 to obtain a TPU inner film; Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, apply the mixture evenly to the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 10-12 g / m. 2 Next, the braided layer is laminated with the inner membrane and cured at 90-100℃ and 0.3-0.5MPa pressure for 10-20 minutes. Step S4, Formation of functional protective coating: After the raw materials of the functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 80-85℃ for 10-15 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared by selecting TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot pressing mold is used to hot press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot pressing is repeated.

[0022] Preferably, the thickness of the PE-based inner film is 0.3-0.5 mm, the thickness of the TPU inner film is 0.2-0.4 mm, the thickness of the braided layer is 0.8-1.2 mm, and the thickness of the functional protective coating is 0.2 mm.

[0023] Due to the application of the above technical solution, the present invention has the following beneficial effects: (1) The pre-perforated water hose disclosed in this invention, through precise control of the raw material ratio and component selection of the PE-based inner membrane, uses LLDPE 7042, Dow 8003 POE, and HTA108HDPE blended in a specific ratio to form a PE blend, which is then compounded with a customized hot melt adhesive. This allows the inner membrane layer to simultaneously possess excellent flexibility, water pressure resistance, and hot melt bonding compatibility, solving the technical bottleneck of traditional water hose inner membranes' difficulty in balancing strength and adhesion. The TPU inner membrane replaces the traditional PE inner membrane, providing a longer service life and adapting to more demanding operating environments.

[0024] (2) The pre-perforated water tape disclosed in this invention uses a water-based polyurethane dispersion, Bayhydrol, as the adhesive layer. ® UH240 is a polar adhesive, compounded with functional additives such as silane coupling agent KH550. Through micro-concave roller coating and precise curing process, a tight bond is achieved between the inner film layer and the polypropylene filament braided layer, which is significantly better than traditional bonding systems. At the same time, with the structural support of the 2000D polypropylene filament braided layer, the overall pressure bearing capacity and impact resistance of the water hose are significantly improved.

[0025] (3) The pre-perforated water hose disclosed in this invention introduces self-healing microcapsules and nano-silica into the functional protective coating. Through the cross-linking and curing of waterborne polyurethane dispersion and closed isocyanate, a composite protective structure with self-healing, wear resistance and anti-aging is formed, which effectively improves the service life. The self-healing microcapsules can automatically release the repair agent when micro-cracks appear in the coating, which solves the problem of water hoses being prone to aging and damage when used outdoors.

[0026] (4) The pre-drilled water hose disclosed in this invention integrates a TPU bionic valve with a Shore hardness of 90A in the pre-drilled hole unit. The spiral groove hole is processed by pulsed fiber laser and combined with hot pressing bonding process to achieve precise forming and reliable sealing of the pre-drilled hole. Compared with the traditional mechanical drilling method, the hole position accuracy error is low, and the unidirectional conduction performance of the bionic valve improves the irrigation uniformity and adapts to the flow control requirements of different scenarios.

[0027] (5) The pre-perforated water hose disclosed in this invention has a synergistic effect in the selection of raw materials and process parameters of each structural layer. From the basic performance of the inner membrane to the functional enhancement of the protective coating, and then to the precise control of the pre-perforated unit, a comprehensive performance optimization system is constructed, which enables the pre-perforated water hose to achieve synergistic improvement in core indicators such as water pressure resistance, anti-aging, sealing reliability, and flexibility. Its comprehensive service life and service stability far exceed those of existing similar products. It has high strength, high flexibility, uniform water output, stable structure, long service life and high preparation efficiency, and has significant technical advantages and application value. Detailed Implementation

[0028] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0029] Example 1 A pre-formed perforated hose includes a hose substrate and pre-formed perforated units uniformly distributed along the length of the hose substrate; the hose substrate consists of an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating, arranged sequentially from the inside out; the inner membrane layer is made of a PE-based inner membrane; the PE-based membrane is composed of a hot melt adhesive and a PE blend in a mass ratio of 3:7; the PE blend is composed of LLDPE, POE, and HDPE in a mass ratio of 10:1:1.

[0030] The LLDPE is LLDPE 7042; the POE is Dow 8003 POE; the HDPE is HTA108 HDPE; the hot melt adhesive is made from the following raw materials in parts by weight: 60 parts matrix, 20 parts tackifying resin, 5 parts plasticizer, 1 part antioxidant, and 1 part lubricant; the matrix is ​​a polyolefin elastomer; the polyolefin elastomer is Dow Engage. ™8150; the tackifying resin is C5 petroleum resin; the C5 petroleum resin is ExxonMobil Escorez. ™ 1102; the plasticizer is epoxidized soybean oil; the antioxidant is a hindered phenolic antioxidant; the hindered phenolic antioxidant is BASF Irganox. ® 1010; The lubricant is calcium stearate.

[0031] The adhesive layer is made from the following raw materials in parts by weight: 80 parts polar base adhesive, 4 parts silane crosslinking agent, 3 parts tackifier, 0.8 parts wetting agent, 1.5 parts curing agent, 0.4 parts antifreeze agent, 0.4 parts defoamer, and 0.1 parts catalyst; the polar base adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte. ™ S115; The wetting agent is a nonionic surfactant, Triton. ™ X-100; the curing agent is the water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate.

[0032] The woven layer is made of polypropylene filaments; the linear density of the polypropylene filaments is 2000D; the functional protective coating is made of the following raw materials in parts by weight: 60 parts of waterborne polyurethane dispersion, 2 parts of waterborne blocked isocyanate curing agent, 8 parts of self-healing microcapsules, 5 parts of nano silica, 2 parts of anti-aging agent, 1 part of dispersant, 3 parts of film-forming aid, 0.8 parts of polyether-modified silicone defoamer DC-65, 2 parts of thickener, and 0.1 parts of dibutyltin dilaurate; the waterborne polyurethane dispersion is Bayhydrol ® UH240; the water-based blocked isocyanate curing agent is Bayhydur. ® Ultra 305; the self-healing microcapsules are prepared according to the microcapsule preparation method in Example 2-1 of the invention patent with authorization announcement number CN116510636B; the average particle size of the nano-silica is 15nm, and the grade is AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a 1:1 mass ratio; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; the thickener is hydroxyethyl cellulose with a molecular weight of 250,000; the pre-formed pore unit integrates a TPU biomimetic valve.

[0033] A method for preparing the pre-perforated water hose includes the following steps: Step S1, film blowing: After mixing hot melt adhesive and PE blend in a certain proportion, the film is blown through a twin-single screw blown film machine at a blowing temperature of 200℃ and a blow-up ratio of 1.5 to obtain a PE-based inner film; Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, the mixture is evenly coated onto the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 10 g / m². 2 Next, the braided layer is laminated with the inner membrane and cured at 90°C and 0.3MPa pressure for 10 minutes. Step S4, Formation of functional protective coating: After the raw materials of the functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 80°C for 10 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared by selecting TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot pressing mold is used to hot press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot pressing is repeated.

[0034] The thickness of the PE-based inner film is 0.3 mm; the thickness of the braided layer is 0.8 mm; and the thickness of the functional protective coating is 0.2 mm.

[0035] Example 2 A pre-perforated hose includes a hose substrate and pre-perforated units uniformly distributed along the length of the hose substrate; the hose substrate consists of an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating from the inside out; the inner membrane layer is made of TPU inner membrane; the TPU inner membrane is made of BASF 1185A TPU.

[0036] The adhesive layer is made from the following raw materials in parts by weight: 83 parts polar base adhesive, 4.5 parts silane crosslinking agent, 3.5 parts tackifier, 0.9 parts wetting agent, 1.8 parts curing agent, 0.45 parts antifreeze agent, 0.45 parts defoamer, and 0.12 parts catalyst; the polar base adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte. ™ S115; The wetting agent is a nonionic surfactant, Triton. ™X-100; the curing agent is the water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate; the braided layer is woven from polypropylene filaments; the linear density of the polypropylene filaments is 2000D.

[0037] The functional protective coating is made from the following raw materials in parts by weight: 63 parts of waterborne polyurethane dispersion, 2.5 parts of waterborne blocked isocyanate curing agent, 9 parts of self-healing microcapsules, 6 parts of nano-silica, 2.5 parts of anti-aging agent, 1.5 parts of dispersant, 3.5 parts of film-forming aid, 0.9 parts of polyether-modified silicone defoamer DC-65, 2.5 parts of thickener, and 0.15 parts of dibutyltin dilaurate; the waterborne polyurethane dispersion is Bayhydrol. ® UH240; the water-based blocked isocyanate curing agent is Bayhydur. ® Ultra 305; the self-healing microcapsules are prepared according to the microcapsule preparation method in Example 2-1 of the invention patent with authorization announcement number CN116510636B; the average particle size of the nano-silica is 15nm, and the grade is AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a 1:1 mass ratio; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; the thickener is hydroxyethyl cellulose with a molecular weight of 250,000; the pre-formed pore unit integrates a TPU biomimetic valve.

[0038] A method for preparing the pre-perforated water hose includes the following steps: Step S1, film blowing: BASF 1185A TPU is blown into a film using a twin-single screw blown film machine at a blowing temperature of 180℃ and a blow-up ratio of 2 to obtain the TPU inner film. Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, the mixture is evenly coated onto the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 10.5 g / m². 2 Next, the braided layer is laminated with the inner membrane and cured at 93°C and 0.35MPa pressure for 13 minutes. Step S4: Formation of functional protective coating: After the raw materials of functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 82°C for 11 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared by selecting TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot pressing mold is used to hot press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot pressing is repeated.

[0039] The thickness of the TPU inner film is 0.2 mm; the thickness of the braided layer is 0.8 mm; and the thickness of the functional protective coating is 0.2 mm.

[0040] Example 3 A pre-formed perforated hose includes a hose substrate and pre-formed perforated units uniformly distributed along the length of the hose substrate; the hose substrate consists of an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating, arranged sequentially from the inside out; the inner membrane layer is made of a PE-based inner membrane; the PE-based membrane is composed of a hot melt adhesive and a PE blend in a mass ratio of 3:7; the PE blend is composed of LLDPE, POE, and HDPE in a mass ratio of 10:1:1.

[0041] The LLDPE is LLDPE 7042; the POE is Dow 8003 POE; the HDPE is HTA108 HDPE; the hot melt adhesive is made from the following raw materials in parts by weight: 65 parts matrix, 25 parts tackifying resin, 6 parts plasticizer, 2 parts antioxidant, and 2 parts lubricant; the matrix is ​​a polyolefin elastomer; the polyolefin elastomer is Dow Engage. ™ 8150; the tackifying resin is C5 petroleum resin; the C5 petroleum resin is ExxonMobil Escorez. ™ 1102; the plasticizer is epoxidized soybean oil; the antioxidant is a hindered phenolic antioxidant; the hindered phenolic antioxidant is BASF Irganox. ® 1010; The lubricant is calcium stearate.

[0042] The adhesive layer is made from the following raw materials in parts by weight: 85 parts polar base adhesive, 5 parts silane crosslinking agent, 4 parts tackifier, 1 part wetting agent, 2 parts curing agent, 0.5 parts antifreeze agent, 0.5 parts defoamer, and 0.15 parts catalyst; the polar base adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte. ™ S115; The wetting agent is a nonionic surfactant, Triton. ™X-100; the curing agent is the water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate; the braided layer is woven from polypropylene filaments; the linear density of the polypropylene filaments is 2000D.

[0043] The functional protective coating is made from the following raw materials in parts by weight: 65 parts of waterborne polyurethane dispersion, 3 parts of waterborne blocked isocyanate curing agent, 10 parts of self-healing microcapsules, 6.5 parts of nano-silica, 3 parts of anti-aging agent, 2 parts of dispersant, 4 parts of film-forming aid, 1 part of polyether-modified silicone defoamer DC-65, 3 parts of thickener, and 0.2 parts of dibutyltin dilaurate; the waterborne polyurethane dispersion is Bayhydrol. ® UH240; the water-based blocked isocyanate curing agent is Bayhydur. ® Ultra 305; the source of the self-healing microcapsules is not particularly required. In one embodiment of the present invention, the self-healing microcapsules are prepared according to the microcapsule preparation method in Embodiment 2-1 of the invention patent with authorization announcement number CN116510636B; the average particle size of the nano-silica is 15nm, and the grade is AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a 1:1 mass ratio; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; the thickener is hydroxyethyl cellulose with a molecular weight of 250,000; the pre-formed pore unit integrates a TPU biomimetic valve.

[0044] A method for preparing the pre-perforated water hose includes the following steps: Step S1, film blowing: After mixing hot melt adhesive and PE blend in a certain proportion, the film is blown through a twin-single screw blown film machine at a blowing temperature of 190℃ and a blow-up ratio of 2 to obtain a PE-based inner film. Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, the mixture is evenly coated onto the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 11 g / m². 2 Next, the braided layer is laminated with the inner membrane and cured at 95°C and 0.4MPa pressure for 15 minutes. Step S4, Formation of functional protective coating: After the raw materials of the functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 83°C for 13 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared by selecting TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot pressing mold is used to hot press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot pressing is repeated.

[0045] The thickness of the PE-based inner film is 0.4 mm; the thickness of the braided layer is 0.9 mm; and the thickness of the functional protective coating is 0.2 mm.

[0046] Example 4 A pre-perforated hose includes a hose substrate and pre-perforated units uniformly distributed along the length of the hose substrate; the hose substrate consists of an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating from the inside out; the inner membrane layer is made of TPU inner membrane; the TPU inner membrane is made of BASF 1185A TPU.

[0047] The adhesive layer is made from the following raw materials in parts by weight: 88 parts polar base adhesive, 5.5 parts silane crosslinking agent, 4.5 parts tackifier, 1.1 parts wetting agent, 2.3 parts curing agent, 0.55 parts antifreeze agent, 0.55 parts defoamer, and 0.18 parts catalyst; the polar base adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte. ™ S115; The wetting agent is a nonionic surfactant, Triton. ™ X-100; the curing agent is the water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate; the braided layer is woven from polypropylene filaments; the linear density of the polypropylene filaments is 2000D.

[0048] The functional protective coating is made from the following raw materials in parts by weight: 68 parts of waterborne polyurethane dispersion, 3.5 parts of waterborne blocked isocyanate curing agent, 11 parts of self-healing microcapsules, 7.5 parts of nano-silica, 3.5 parts of anti-aging agent, 2.5 parts of dispersant, 4.5 parts of film-forming aid, 1.1 parts of polyether-modified silicone defoamer DC-65, 3.5 parts of thickener, and 0.25 parts of dibutyltin dilaurate; the waterborne polyurethane dispersion is Bayhydrol. ®UH240; the water-based blocked isocyanate curing agent is Bayhydur. ® Ultra 305; the self-healing microcapsules are prepared according to the microcapsule preparation method in Example 2-1 of the invention patent with authorization announcement number CN116510636B; the average particle size of the nano-silica is 15nm, and the grade is AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a 1:1 mass ratio; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; the thickener is hydroxyethyl cellulose with a molecular weight of 250,000; the pre-formed pore unit integrates a TPU biomimetic valve.

[0049] A method for preparing the pre-perforated water hose includes the following steps: Step S1, film blowing: BASF 1185A TPU is blown into a film using a twin-single screw blown film machine at a blowing temperature of 190℃ and a blow-up ratio of 2 to obtain the TPU inner film. Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, the mixture is evenly coated onto the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 11.5 g / m². 2 Next, the braided layer is laminated with the inner membrane and cured at 98°C and 0.45MPa pressure for 18 minutes. Step S4, Formation of functional protective coating: After the raw materials of the functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 84°C for 14 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared by selecting TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot pressing mold is used to hot press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot pressing is repeated.

[0050] The thickness of the TPU inner film is 0.3 mm; the thickness of the braided layer is 1 mm; and the thickness of the functional protective coating is 0.2 mm.

[0051] Example 5 A pre-perforated hose includes a hose substrate and pre-perforated units uniformly distributed along the length of the hose substrate; the hose substrate comprises, from the inside out, an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating; the inner membrane layer is made of a PE-based inner membrane; the PE-based membrane is composed of a hot melt adhesive and a PE blend in a mass ratio of 3:7; the PE blend is composed of LLDPE, POE, and HDPE in a mass ratio of 10:1:1; the LLDPE is LLDPE 7042; the POE is Dow 8003 POE; and the HDPE is HTA108 HDPE.

[0052] The hot melt adhesive is made from the following raw materials in parts by weight: 70 parts matrix, 30 parts tackifying resin, 7 parts plasticizer, 3 parts antioxidant, and 3 parts lubricant; the matrix is ​​a polyolefin elastomer; the polyolefin elastomer is Dow Engage. ™ 8150; the tackifying resin is C5 petroleum resin; the C5 petroleum resin is ExxonMobil Escorez. ™ 1102; the plasticizer is epoxidized soybean oil; the antioxidant is a hindered phenolic antioxidant; the hindered phenolic antioxidant is BASF Irganox. ® 1010; The lubricant is calcium stearate.

[0053] The adhesive layer is made from the following raw materials in parts by weight: 90 parts polar base adhesive, 6 parts silane crosslinking agent, 5 parts tackifier, 1.2 parts wetting agent, 2.5 parts curing agent, 0.6 parts antifreeze agent, 0.6 parts defoamer, and 0.2 parts catalyst; the polar base adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte. ™ S115; The wetting agent is a nonionic surfactant, Triton. ™ X-100; the curing agent is the water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate; the braided layer is woven from polypropylene filaments; the linear density of the polypropylene filaments is 2000D.

[0054] The functional protective coating is made from the following raw materials in parts by weight: 70 parts of waterborne polyurethane dispersion, 4 parts of waterborne blocked isocyanate curing agent, 12 parts of self-healing microcapsules, 8 parts of nano-silica, 4 parts of anti-aging agent, 3 parts of dispersant, 5 parts of film-forming aid, 1.2 parts of polyether-modified silicone defoamer DC-65, 4 parts of thickener, and 0.3 parts of dibutyltin dilaurate; the waterborne polyurethane dispersion is Bayhydrol.® UH240; the self-healing microcapsules are prepared according to the microcapsule preparation method in Example 2-1 of the invention patent with authorization announcement number CN116510636B; the average particle size of the nano-silica is 15nm, and the grade is AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a 1:1 mass ratio; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; the thickener is hydroxyethyl cellulose with a molecular weight of 250,000; the pre-formed pore unit integrates a TPU biomimetic valve.

[0055] A method for preparing the pre-perforated water hose includes the following steps: Step S1, film blowing: After mixing hot melt adhesive and PE blend in a certain proportion, the film is blown through a twin-single screw blown film machine at a blowing temperature of 180℃ and a blow-up ratio of 2.5 to obtain a PE-based inner film. Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, the mixture is evenly coated onto the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 12 g / m². 2 Next, the braided layer is laminated with the inner membrane and cured at 100°C and 0.5MPa pressure for 20 minutes. Step S4, Formation of functional protective coating: After the raw materials of the functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 85°C for 15 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared by selecting TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot pressing mold is used to hot press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot pressing is repeated.

[0056] The thickness of the PE-based inner film is 0.5 mm; the thickness of the braided layer is 1.2 mm; and the thickness of the functional protective coating is 0.2 mm.

[0057] Comparative Example 1 This example provides a pre-perforated water tape and its preparation method, which is basically the same as that in Example 5, except that the matrix of the hot melt adhesive is EVA resin.

[0058] Comparative Example 2 This example provides a pre-perforated water hose and its preparation method, which is basically the same as that in Example 5, except that the PE blend is made by blending LLDPE and HDPE in a mass ratio of 10:1.

[0059] Comparative Example 3 This example provides a pre-perforated water hose and its preparation method, which is basically the same as Example 5, except that it does not have a functional protective coating.

[0060] To further illustrate the beneficial technical effects of the pre-perforated water hoses involved in the embodiments of this application, relevant performance tests were conducted on the pre-perforated water hoses involved in Embodiment 5 and Comparative Examples 1-3. The test methods and test results are shown in Table 1.

[0061] (1) Self-healing performance: If the coating is intact after 24 hours using the artificial scratch method, the self-healing performance is qualified; otherwise, it is not qualified.

[0062] (2) Adhesion strength: Refer to HG / T 3052-2022 to test the dry adhesion strength (N / 20mm) between the inner membrane layer and the braided layer.

[0063] (3) Bursting pressure: Refer to GB / T 6246-2011 for testing.

[0064] (4) Flexibility: The flexibility test was conducted using a three-point bending tester with a bending angle of 90°. The test was continued until the sample showed obvious cracks. The greater the number of tests, the better the flexibility.

[0065] Table 1 Performance test results of pre-fabricated perforated hoses Example 5 qualified 55.26 4.2 1500 Comparative Example 1 qualified 46.03 3.8 960 Comparative Example 2 qualified 53.40 4.1 1230 Comparative Example 3 Not approved — 3.3 1460 As shown in Table 1, the pre-perforated water hose of Example 5 of this invention exhibits better adhesive strength, burst pressure, and flexibility compared to the comparative example. The combined use of the hot melt adhesive matrix, PE blend, and functional protective coating plays a positive role in improving the above-mentioned effects.

[0066] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pre-formed perforated water hose, characterized in that, The device includes a water hose substrate and pre-formed perforated units evenly distributed along the length of the water hose substrate. The water hose substrate consists of an inner membrane layer, an adhesive layer, a braided layer, and a functional protective coating, arranged sequentially from the inside out. The inner membrane layer is made of a PE-based inner membrane. The PE-based membrane is a blend of hot melt adhesive and a PE blend in a mass ratio of 3:

7. The PE blend is a blend of LLDPE, POE, and HDPE in a mass ratio of 10:1:

1. The pre-formed perforated units integrate a TPU biomimetic valve. The hot melt adhesive is made from the following raw materials in parts by weight: 60-70 parts matrix, 20-30 parts tackifying resin, 5-7 parts plasticizer, 1-3 parts antioxidant, and 1-3 parts lubricant; the matrix is ​​a polyolefin elastomer; the polyolefin elastomer is Dow Engage™ 8150; The functional protective coating is made from the following raw materials in parts by weight: 60-70 parts of waterborne polyurethane dispersion, 2-4 parts of waterborne blocked isocyanate curing agent, 8-12 parts of self-healing microcapsules, 5-8 parts of nano-silica, 2-4 parts of anti-aging agent, 1-3 parts of dispersant, 3-5 parts of film-forming aid, 0.8-1.2 parts of polyether-modified silicone defoamer DC-65, 2-4 parts of thickener, and 0.1-0.3 parts of dibutyltin dilaurate; the waterborne polyurethane dispersion is Bayhydrol. ® UH240; the water-based blocked isocyanate curing agent is Bayhydur. ® Ultra 305; the nano-silica has an average particle size of 15 nm and is graded AEROSIL. ® R106; the anti-aging agent is UV-327, Irganox ® 1010 is compounded in a mass ratio of 1:1; the dispersant is polycarboxylate dispersant SN-5040; the film-forming aid is propylene glycol methyl ether acetate; and the thickener is hydroxyethyl cellulose with a molecular weight of 250,000.

2. The pre-formed perforated water hose according to claim 1, characterized in that, The LLDPE is LLDPE 7042; the POE is Dow 8003 POE; and the HDPE is HTA108 HDPE.

3. The pre-formed perforated water hose according to claim 1, characterized in that, The tackifying resin is C5 petroleum resin; the C5 petroleum resin is ExxonMobil Escorez™ 1102; the plasticizer is epoxidized soybean oil; the antioxidant is a hindered phenolic antioxidant; the hindered phenolic antioxidant is BASF Irganox. ® 1010; The lubricant is calcium stearate.

4. The pre-formed perforated water hose according to claim 1, characterized in that, The adhesive layer is made of the following raw materials in parts by weight: 80-90 parts of polar base adhesive, 4-6 parts of silane crosslinking agent, 3-5 parts of tackifier, 0.8-1.2 parts of wetting agent, 1.5-2.5 parts of curing agent, 0.4-0.6 parts of antifreeze agent, 0.4-0.6 parts of defoamer, and 0.1-0.2 parts of catalyst.

5. The pre-formed perforated water hose according to claim 4, characterized in that, The polar main adhesive is a water-based polyurethane dispersion, Bayhydrol. ® UH240; the silane crosslinking agent is silane coupling agent KH550; the tackifier is terpene resin Piccolyte™ S115; the wetting agent is nonionic surfactant Triton™ X-100; and the curing agent is water-based isocyanate curing agent Desmodur. ® N3300; the antifreeze is ethylene glycol; the defoamer is silicone defoamer DC-1500; the catalyst is dibutyltin dilaurate.

6. The pre-formed perforated water hose according to claim 1, characterized in that, The braided layer is woven from polypropylene filaments; the linear density of the polypropylene filaments is 2000D.

7. A method for preparing a pre-perforated water hose according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1, film blowing: After mixing hot melt adhesive and PE blend in a certain proportion, blow film is blown through a twin-single screw blown film machine at a blowing temperature of 160-200℃ and a blow-up ratio of 1.5-2.5 to obtain a PE-based inner film; Step S2, Circular weaving: Weave the woven layers using a circular loom; Step S3, Adhesive Lamination: After uniformly mixing all the raw materials for the adhesive layer, apply the mixture evenly to the outer surface of the inner membrane using a micro-grooved roller, with a coating amount of 10-12 g / m. 2 Next, the braided layer is laminated with the inner membrane and cured at 90-100℃ and 0.3-0.5MPa pressure for 10-20 minutes. Step S4, Formation of functional protective coating: After the raw materials of the functional protective coating are mixed evenly, they are evenly rolled onto the outer surface of the braided layer and baked at 80-85℃ for 10-15 minutes to cure, thus obtaining the blank. Step S5, Pre-drilled Hole Processing: A 20W pulsed fiber laser is used to process the hole structure at a preset position on the blank at a speed of 50mm / s; the hole shape is a spiral groove hole, and compressed air is used to blow away the residue inside the hole after drilling; a biomimetic valve is prepared using TPU with a Shore hardness of 90A, which consists of a central valve plate and a sealing ring; the valve is aligned with the pre-drilled hole, and a hot-pressing mold is used to hot-press for 30s at a temperature of 120℃ and a pressure of 0.2MPa to melt and bond the valve sealing ring with the outer coating; then, a TPU sealing joint is fitted at the hole opening, and the hot-pressing bonding is repeated; the thickness of the PE-based inner membrane is 0.3-0.5mm; the thickness of the braided layer is 0.8-1.2mm; and the thickness of the functional protective coating is 0.2mm.