A thin-walled high-strength inlaid drip irrigation belt and its high-speed production method

Abstract

The invention discloses a thin-wall high-strength internal inlay type drip irrigation tape and a high-speed production method thereof and belongs to the field of high-polymer material processing. Special material composition for the drip irrigation tape comprises components in parts by weight as follows: 30-70 parts of DFDA7042 linear low-density polyethylene, 30-70 parts of DGDB2480H double-peak high-density polyethylene, 30-40 parts of thin-wall high-strength drip irrigation tape modifying materials, 2-3 parts of rheology modifier PPA (phenyl-propanolamine) master batch, 0.7-2.5 parts of lubricant calcium stearate and 8-10 parts of colorant carbon black master batch. The drip irrigation tape is produced through three steps including preparation, blending and extrusion and stretch forming of the thin-wall high-strength drip irrigation tape modifying materials; during extrusion processing of the special material, the melt strength is high, the forming performance is good, the thin-wall high-strength internal inlay type drip irrigation tape can be produced at a linear speed of higher than 130 m / min, high-speed processing is realized, and a product has excellent pressure resistance, drawing resistance and environmental stress cracking resistance and has smooth, black and shiny appearance.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a thin-walled high-strength inlaid drip irrigation belt and a high-speed production method thereof. Background technique [0002] With the rapid development of water-saving irrigation agriculture in my country, the inlaid drip irrigation belt has been widely used in facility agronomy and field crop irrigation due to its small flow deviation and strong resistance to blocking. At present, there is no special resin suitable for the processing characteristics of inlaid drip irrigation belt products in my country, so domestic water-saving product manufacturers usually use general-purpose polyethylene as the base material to produce inlaid drip irrigation belts, so not only the pressure resistance of thin-walled products is low , The drawing resistance is poor, and the thickness deviation is large due to factors such as the low melt strength of the general-purpose ...

AI Technical Summary

Problems solved by technology

At present, there is no special resin suitable for the processing characteristics of inlaid drip irrigation belt products in my country, so domestic water-saving product manufacturers usually use general-purpose polyethylene as the base material to produce inlaid drip irrigation belts, so not only the pressure resistance of thin-walled products is low , The drawing resistance is poor, and the thickness deviation is large due to factors such as the low melt strength of the general-purpose resin during processing, and the production line speed is low, which is maintained at about 100m / min. Therefore, the wall thickness of the product is generally above 0.20mm to meet the processing requirements. The use requirements lead to high cost of product materials, and farmers need to update drip irrigation belts every year, and the input-output ratio of applying drip irrigation technology is too large. This situation has seriously affected the further development of drip irrigation and water-saving business in my country.

[0003] Chinese patent ZL02154616.9 discloses a nano-modified material drip irrigation belt, which is composed of one or more of the matrix linear low-density polyethylene resin, low-density resin, medium-density resin or high-density resin, and an appropriate amount of nanometer It is composed of calcium carbonate and other additives. It uses general-purpose resin as the base material. Although this technology is filled with nano-calcium carbonate to strengthen and toughen the product, the main purpose is to use nano-calcium carbonate instead of processing aids to reduce the cost of the product. cost, its product pressure resistance is relatively low and cannot be used in the production of thin-walled products; , high-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer and other general resins, as well as rheology modifiers and compatibilizers, the purpose is to improve the compatibility of polypropylene and polyethylene blends, and solve the delamination and The separation phenomenon is mainly suitable for the production of thick-walled large pipes. When its technology is applied to the production of inlaid drip irrigation belts, the melt strength is low, and problems such as broken pipes and large thickness deviations are prone to occur. Higher speed production cannot be achieved, and it is more suitable for single Wing labyrinth drip irrigation belt production; Chinese patent application 201310663821.9 discloses a micro-pressure ultra-thin wall drip irrigation belt, which consists of high-density polyethylene Ⅰ, high-density polyethylene Ⅱ, linear low-density polyethylene, silica, dispersed Agents, antioxidants and light stabilizers. The high-density polyethylene II added to increase the pressure resistance of thin products is 2480 type, which is still used for grade 80 pipe materials. The molecular weight distribution of this resin is unimodal. And its melt flow rate is too large, the melt strength is low, it is difficult to realize the high-speed production of drip irrigation belt products, and it is only suitable for the production of single-wing labyrinth drip irrigation belt

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