CN104562284B - The preparation method of fiber for marine fish culture etting - Google Patents

Abstract

The manufacturing method of the fiber used for seawater fish culture net clothing adopts HDPE resin, auxiliary agent, metallocene LLDPE resin, mixer, single-screw extruder, double-drawing electric heating drafting machine, wire collecting machine, and wire dividing machine, It is characterized in that HDPE resin is sieved, the amount of additives added is 0.6% of the weight of HDPE resin, the amount of metallocene LLDPE resin added is 10.3% of the weight of HDPE resin, and it is stirred with a mixer for 19-31 minutes until the materials are evenly stirred to obtain HDPE/ Metallocene LLDPE resin blends; HDPE/metallocene LLDPE resin blends are melt-extruded through a single-screw extruder, and the melt-extruded as-spun filaments are cooled and pre-drawn by the cooling water tank and the first drafting roller, and pre-drawn After two times of hot drawing, the high-pressure airflow is used to remove oil and then cooled rapidly, and the fiber bundle is wound up by a winding machine; the fiber bundle is divided into fibers for seawater fish breeding net clothing by a fiber splitter.

Description

Preparation method of fiber for seawater fish breeding net clothing

technical field

The invention relates to a method for manufacturing fibers for breeding nets in the technical field of seawater fish farming.

Background technique

Breeding net clothing is an indispensable and important material for seawater fish seine or cage culture, and its performance is directly related to the success or failure of seawater fish culture. Fiber is one of the main materials for the production of aquaculture nets in the field of seawater fish farming technology. It is directly related to the performance of aquaculture nets, the consumption of raw materials for aquaculture nets, and the safety of seawater fish aquaculture facilities. The fiber is processed with a single high-density polyethylene resin as raw material by hot water drawing process. Due to improper control of the drawing process, the nodule strength is relatively low, which will further affect the performance of breeding nets, the consumption of raw materials for breeding nets and seawater. The safety of fish breeding facilities, therefore, in the prior art field, ordinary polyethylene monofilament processed by hot water stretching process with a single high-density polyethylene resin as raw material has poor performance adaptability, and it is difficult to meet the needs of modern seawater fish farming production . With the large-scale and offshore development of marine fish farming, there is an urgent need for a large number of fibers with high nodule strength and good adaptability for making net clothing for marine fish farming. Only by changing the traditional fiber technology can we prepare nets suitable for the above requirements. The fiber used for making nets for seawater fish farming, and the solution to the problem of fibers for making nets for seawater fish farming is a long-standing unresolved technical problem, which has a significant effect on reducing the consumption of raw materials for breeding nets and increasing the safety of breeding nets.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for making fibers for breeding nets in the field of seawater fish farming technology, which can improve the nodule strength and stability of fibers used for making breeding nets, increase the performance of breeding nets, and reduce the cost of breeding nets. Reduce the consumption of raw materials for clothing, improve the safety of marine fish farming facilities, and promote energy conservation and emission reduction in fisheries.

The technical scheme of the present invention adopts drawing-grade dry HDPE resin, white oil or turpentine additive, metallocene LLDPE resin, mixer, single-screw extruder, double-drawing electric heating drafting machine, wire receiving machine, and wire dividing machine, It is characterized in that the dry HDPE resin of the drawing grade is sieved, and the melt index should meet 0.7g/10min～1.4g/10min; the additive amount of white oil or turpentine oil is 0.6% of the weight of the dry HDPE resin of the drawing grade; the metallocene LLDPE resin is melted The index is 1g/10min, and the addition amount is 10.3% of the weight of HDPE resin. Use a mixer to mix and stir the drawing-grade dry HDPE resin, white oil or turpentine additive, and metallocene LLDPE resin for 19-31 minutes until the materials are evenly stirred, and the mixture is stirred. After uniformity, HDPE/metallocene LLDPE resin blends are obtained; HDPE/metallocene LLDPE resin blends are controlled by the temperature control of the first zone, zone II, zone III and zone IV of the electric heating zone of the barrel of the single-screw extruder. The ranges are 162-167°C, 265-270°C, 307-315°C, 343-350°C for melt extrusion, and the as-spun yarn melted and extruded from the spinneret hole passes through the cooling water tank at 25°C-33°C low temperature water and the first drawing The stretching roll is cooled and pre-drawn, the cooling distance of the as-spun yarn is controlled at 0.88m to 1.03m, the vertical distance between the spinneret and the water surface in the cooling water tank is controlled at 3cm to 8cm, and the pre-drawn yarn is controlled at 97°C to 99°C High temperature first drawing water bath and second drawing roller, 108.5℃～113℃ high temperature second drawing hot oil bath and third drawing roller for two hot drawing, using soybean oil or ethylene glycol as drawing heating Medium, the pre-drawn yarn is drawn twice through the electric heating drawing machine for the above two times of hot drawing, the total drawing ratio is controlled at 9.6 times to 10.0 times, and the 0.57MPa~0.62MPa high-pressure air flow is used to remove oil and then quickly cooled. The fiber bundle is rewound by a winding machine using a torque motor; the splitting tension of the fiber bundle is controlled at 26% to 34% of the breaking strength of the fiber, and the splitting machine splits into fibers for making sea fish breeding nets.

In this method, a large number of experiments are carried out on different wire drawing process conditions, including drawing ratio, wire drawing temperature and metallocene LLDPE addition amount, and the technical solution of the present invention is formed on the basis of a large number of scientific experiments and demonstrations. The test results show that the seawater fish culture net clothing processed by the present invention is suitable for the technical field of seawater fish culture. It not only has nodular strength, stability and wear resistance compared with the polyethylene monofilament for traditional culture net clothing. And spinnability advantages, but also increase the performance of breeding nets, reduce the consumption of raw materials for breeding nets, improve the safety of marine fish farming facilities, the technical effect is very significant. In the present invention, a specific proportion of white oil or turpentine additives and metallocene LLDPE resin is added to the HDPE resin masterbatch, and after being evenly stirred by a mixer, a special wire drawing technology is used to produce a marine fish culture suitable for the technical field of sea fish culture. The fiber for making net clothes, while ensuring the continuous industrial production of the fiber, simultaneously improves the nodular strength and stability of the fiber, and improves the softness, abrasion resistance and spinnability of the fiber; the seawater fish processed by the present invention The overall performance of the fiber used for the production of similar breeding nets is significantly higher than that of the existing fibers for the production of breeding nets; the invention adopts a special splitting process, such as the splitting tension is controlled at 26% to 34% of the fiber breaking strength, thereby ensuring the splitting The yarn tension can not only separate the intersecting fibers in the fiber bundle wound on the bobbin, but also prevent the bobbin from accepting excessive winding tension to cause indentation fibers, thereby improving the physical properties of the existing fiber products for breeding nets. Performance; the present invention adopts a special drawing process, such as the second hot drawing of the present invention, using soybean oil or ethylene glycol as a special drawing heating medium to replace the traditional hot water drawing process with drawing heating water medium, aiming at aquaculture net The characteristics of the fiber used in clothing The special drafting ratio used ensures that the heat treatment temperature of the fiber is higher than 108.5°C when it is drawn in the second bath, and ensures that the drawing is normal and the drafting is smooth during the fiber preparation process, which is beneficial to the fiber nodule strength and The improvement of crystallinity makes the softness and wear resistance of the processed fiber for breeding net clothing good, the nodule strength reaches 5.05g/D and the elongation at break is in the range of 17-21%. The strength can be increased by 23.6% compared with the existing standard index (4.08g/D) of ordinary polyethylene monofilament; its elongation at break fully meets the needs of seawater fish farming. The test results show that the stability and wear resistance of the fibers developed by the present invention are better, and the higher melting point, heat of fusion and temperature resistance are better so that the fibers for the production of net clothing for seawater fish culture produced by the present invention have good stability and wear resistance, the technical scheme of the present invention can effectively improve the impact resistance of the fiber and its netting under harsh sea conditions; under the condition that the strength of the breeding net is the same as the mesh size, the fiber developed by the present invention can be used to make seawater fish breeding nets Clothes can not only reduce the thickness of the nets and feet of the nets used in cages or seines, reduce the water resistance, but also reduce the weight of the cultured nets used in cages or seines, reduce the consumption of raw materials, and improve the stability. The physical properties and adaptability of the breeding nets used in cages or seines are greatly improved, and the breeding nets have a remarkable effect on wind, wave and current resistance. Considering the cost of breeding nets and the characteristics of seawater fish breeding engineering materials, the present invention uses relatively cheap metallocene LLDPE resin and the mixture is not blended and granulated by a twin-screw extruder to reduce the cost of fibers used in the production of breeding nets , to facilitate the industrial application of the invented product on the breeding net clothes.

detailed description

The invention adopts drawing-grade drying HDPE resin, white oil or turpentine additives, metallocene LLDPE resin, mixer, single-screw extruder, double-drawing electric heating drafting machine, wire collecting machine, wire dividing machine, and drawing-grade drying HDPE resin (available on the market, produced by Yangzi Petrochemical) is sieved, and the melt index should meet 0.7g/10min~1.4g/10min. If the HDPE resin is damp, it should be dried or placed in the sun before use; The additive amount of oil or turpentine oil is 0.6% of the weight of the drawing grade dry HDPE resin; metallocene LLDPE resin (available in the market, produced by Daqing Petrochemical Company), the melt index is 1g/10min, and the density is 0.918g/cm ³ , the additive amount It is 10.3% of the weight of the wire-drawing dry HDPE resin. Stir with a mixer for 27 minutes until the materials are mixed and stirred evenly. After the mixture is evenly mixed, a HDPE/metallocene LLDPE resin blend is obtained; the HDPE/metallocene LLDPE resin blend is Single-screw extruder (screw length-to-diameter ratio is 25:1, filter plate thickness is 10mm, filter screen adopts a layer of 78-mesh wire mesh, a layer of 118-mesh copper alloy wire mesh) at a specific temperature (extruder barrel electric heating zone The temperature of Zone I, Zone II, Zone III and Zone IV are 165°C, 268°C, 312°C, and 347°C respectively), and the as-spun filaments melted and extruded from the spinneret hole pass through the cooling water tank with low-temperature water ( The cooling distance of primary silk is controlled at 0.88m~1.03m, the vertical distance between the spinneret and the water surface in the cooling water tank is controlled at 3cm~8cm, the water temperature is controlled at 25°C~33°C, and the size of the cooling water tank is 0.62m×0.52m× 0.62m) and the first drafting roller are cooled and pre-drawn, and the pre-drawn silk is passed through a 98°C high-temperature first drafting water bath and a second drafting roller, and a 111°C high-temperature second drafting hot oil bath (with soybean oil) or ethylene glycol as a special drafting heating medium) and the third drafting roller for two thermal drafts, and the pre-drawn yarn is controlled by the total multiple of the above two thermal drafts through the electric heating drafting machine for two drafts After 9.6 times to 10.0 times, use high-pressure (pressure control at about 0.57MPa-0.62MPa) airflow to remove oil and then cool quickly, and use a winding machine with a torque motor to wind up the fiber bundles used for the production of breeding nets; for the production of breeding nets The fiber bundle is divided into fibers for the production of breeding nets through a spinning machine under a specific splitting tension (the splitting tension is controlled at 26% to 34% of the fiber breaking strength). g/D and the elongation at break is in the range of 17% to 21%). The method of the invention has stable product quality and can be produced in continuous industrialization, and the technical effect of the invention is remarkable. The technical solution of the present invention pays attention to the knot strength and spinnability of fiber products, and the high-performance modified fiber with a linear density of 387D is especially suitable for processing into breeding nets; the strength of the breeding nets is the same as the mesh size and has the advantage of cost performance Under certain conditions, the strength of the breeding net can be improved, the weight can be reduced, the water resistance can be reduced, the consumption of raw materials can be reduced, and the safety and adaptability can be improved, which greatly improves the physical properties and adaptability of the fiber and its downstream breeding net , in the technical field of seawater fish culture, the technical effect of the fiber used in the production of net clothes for seawater fish culture is remarkable.

Claims (1)

1. The method of making fibers for seawater fish farming nets, using drawing-grade dry HDPE resin, white oil or turpentine additives, metallocene LLDPE resin, mixer, single-screw extruder, and twice-drawing electric heating drafting machine , wire collecting machine, wire dividing machine, characterized in that the wire drawing grade dry HDPE resin is sieved, and the melt index should meet 0.7g/10min～1.4g/10min; the additive amount of white oil or turpentine is the weight of the wire drawing grade dry HDPE resin The melt index of metallocene LLDPE resin is 1g/10min, and the addition amount is 10.3% of the weight of HDPE resin. Use a mixer to mix and stir the drawing-grade dry HDPE resin, white oil or turpentine additives, and metallocene LLDPE resin for 19 minutes to 31 minutes. Until the materials are evenly stirred, the HDPE/metallocene LLDPE resin blend is obtained after the mixture is evenly stirred; the HDPE/metallocene LLDPE resin blend passes through the first zone and the second zone of the electric heating zone of the barrel of the single-screw extruder The temperature control ranges of zone Ⅲ and zone Ⅳ are 162°C~167°C, 265°C~270°C, 307°C~315°C, 343°C~350°C for melt extrusion. Cooling water in the cooling water tank at 25°C-33°C and the first drafting roller are cooled and pre-drawn, the cooling distance of the as-spun yarn is controlled at 0.88m-1.03m, and the vertical distance between the spinneret and the water surface in the cooling water tank is controlled at 3cm ~8cm, the pre-drawn yarn is heated twice through the first drawing water bath and the second drawing roller at 97°C to 99°C, and the second drawing hot oil bath at 108.5°C to 113°C and the third drawing roller. Drawing, using soybean oil or ethylene glycol as the drawing heating medium, the pre-drawing yarn is drawn twice through the electric heating drawing machine to carry out the above two hot drawing, the total drawing ratio is controlled at 9.6 times to 10.0 times, using 0.57MPa～0.62MPa high-pressure airflow after degreasing and rapid cooling to wind up the fiber bundle with a torque motor winding machine; the fiber bundle splitting tension is controlled at 26%~34% of the fiber breaking strength. Fibers used in the production of marine fish breeding nets.