Low-temperature-resistant straw bundling net and preparation method thereof

Abstract

The invention relates to the technical field of straw bundling nets, in particular to a low-temperature-resistant straw bundling net and a preparation method thereof, solves the defects in the prior art, and mainly comprises the following raw materials in parts by mass: 65-75 parts of modified wollastonite, 25-35 parts of polyethylene, 13-28 parts of dioctyl sebacate, 20-30 parts of bisphenol A type epoxy vinyl resin, 12-20 parts of modified wood flour and 5-9 parts of talcum powder. Compared with the prior art, the impact resistance and the tensile property of the straw bundling net at low temperature can be improved, and meanwhile, the water resistance of the straw bundling net can also be improved.

Description

Technical Field

[0001] The invention relates to the technical field of bale nets, and in particular to a low-temperature resistant bale net and a preparation method thereof. Background Art

[0002] Bale net is a mesh product used to bundle materials such as forage grass, straw, and rice straw. Its main raw materials include polypropylene and polyethylene. These materials have high strength and durability, and can meet the needs of agricultural production and storage. High-density polyethylene bale net is made by a series of wire drawing and weaving by warp knitting machines. It can also be called forage baling net, bale net, etc. This material is not only used for bundling and storage of forage such as rice straw and stalks in pastures, farms, rice fields, grasslands, etc., but can also be used for bundling before baling silage with forage film, and even for winding industrial packaging.

[0003] During the use of the bale net, in order to bundle more grass and straw, workers usually tighten the two ends of the bale net, thereby generating a certain tension on the bale net so that the bale net can accommodate more. Moreover, in winter, due to the drop in temperature, some properties of the bale net (such as stretching, impact, etc.) will be greatly reduced, thus affecting its use. In addition, in autumn and winter, since the bale net is mostly used in outdoor environments, dewdrops are easily formed on the grass, and the bale net will adhere to these dewdrops during the tying process. If the bale net has strong water absorption, it may shorten the life of the bale net and increase the workers' handling workload.

[0004] Therefore, it is necessary to provide a low temperature resistant bale net and a preparation method thereof to solve the problems raised. Summary of the invention

[0005] The object of the present invention is to provide a low temperature resistant bale net and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0008] 65-75 parts of modified wollastonite, 25-35 parts of polyethylene, 13-28 parts of dioctyl sebacate, 20-30 parts of bisphenol A epoxy vinyl resin, 12-20 parts of modified wood powder, and 5-9 parts of talc.

[0009] In one embodiment, the raw materials of the modified wollastonite include water glass solution, wollastonite powder, polyethylene glycol and hydrochloric acid, wherein the mass ratio of water glass, wollastonite and polyethylene glycol is 5:20:1, and the molar ratio of hydrochloric acid to water glass is 2.1:1.

[0010] In one embodiment, the specific preparation process of the modified wollastonite is as follows:

[0011] Add 1250 mesh wollastonite powder and 5% polyethylene glycol to the water glass solution, and mix them into a uniform suspension under the mechanical force of a stirrer at a speed of 300-400 r / min;

[0012] Then, 3 mol / L hydrochloric acid is used for acidification with stirring at a speed of 1000-1200 r / min, and the mixture is kept warm at 70°C in an electric constant temperature water bath furnace for aging for 1-1.5 hours at a pH value of 7-8, and then the mixture is washed and filtered with distilled water, and then dried at a temperature of 120°C in an electric blast drying oven, ground and broken up through a 120-mesh sieve, and agglomerated particles are removed to obtain modified wollastonite particles.

[0013] In one embodiment, the raw materials of the modified wood powder include 80-mesh wood powder, maleic anhydride grafted polyethylene, high-density polyethylene, methyl methacrylate, butyl methacrylate and styrene, wherein the mass ratio of wood powder, high-density polyethylene and maleic anhydride grafted polyethylene is 50:50:3, and the added amount of methyl methacrylate, butyl methacrylate and styrene is 3% of the total amount of wood powder and high-density polyethylene.

[0014] In one embodiment, the preparation process of the modified wood powder is as follows:

[0015] The wood powder is dried at a temperature of 105±2°C to constant weight, and methyl methacrylate, butyl methacrylate and styrene are respectively sprayed evenly on the surface of the wood powder in a fine mist form, and the wood powder is stirred while spraying. After the spraying is completed, the wood powder is placed at 80°C for 1 hour, and then it is put into a high-speed mixer for mixing with high-density polyethylene and maleic anhydride grafted polyethylene, and the mixed material is extruded and granulated in a twin-screw extruder.

[0016] A method for preparing a low-temperature resistant bale net comprises the following steps:

[0017] S1, wire drawing, heating and melting each raw material, and then feeding it into a wire drawing machine to draw it into filaments;

[0018] S2, weaving, weaving the filaments obtained in S1 into a bale net with a mesh structure through a weaving machine;

[0019] S3, label tape, is pasted on the upper and lower sides of the bale net of S2 at intervals through a label tape machine;

[0020] S4, rolling net, using the winder to roll up the bale net after the winning belt in S3;

[0021] S5. Packaging: put the bale net rolled in S4 into the packaging bag and seal it.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0023] 1. The present invention uses wollastonite powder and water glass solution as main raw materials, and adds polyethylene glycol in the compounding process, so that a layer of nano-scale silicon dioxide particles is coated on the surface of the wollastonite, which significantly improves the impact resistance and tensile strength of the bale net at low temperature.

[0024] 2. The present invention processes wood powder, sprays the wood powder with methyl methacrylate, butyl methacrylate and styrene, and blends the sprayed wood powder with high-density polyethylene and maleic anhydride grafted polyethylene for extrusion granulation, and adds the wood powder in this state to the raw materials to prepare the bale net, which can significantly improve the water resistance of the bale net. DETAILED DESCRIPTION

[0025] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0026] Embodiment 1:

[0027] A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0028] 65 parts of polypropylene, 25 parts of polyethylene, 13 parts of dioctyl sebacate, 20 parts of bisphenol A epoxy vinyl resin, 10 parts of modified wollastonite, 12 parts of modified wood powder, and 5 parts of talc.

[0029] Embodiment 2:

[0030] A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0031] 70 parts of polypropylene, 30 parts of polyethylene, 20 parts of dioctyl sebacate, 25 parts of bisphenol A epoxy vinyl resin, 13 parts of modified wollastonite, 16 parts of modified wood powder, and 7 parts of talc.

[0032] Embodiment 3:

[0033] A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0034] 75 parts of polypropylene, 35 parts of polyethylene, 28 parts of dioctyl sebacate, 30 parts of bisphenol A epoxy vinyl resin, 16 parts of modified wollastonite, 20 parts of modified wood powder, and 9 parts of talc.

[0035] The specific preparation process of a single mass portion of modified wollastonite is as follows:

[0036] 274 g of 1250 mesh wollastonite powder and 13.7 g of 5% polyethylene glycol were added to 68.5 g of water glass solution (modulus ratio of 3:3), the mass ratio of water glass, wollastonite and polyethylene glycol being 5:20:1, and the mixture was prepared into a uniform suspension under the mechanical force of a stirrer at a speed of 300 r / min;

[0037] Then, 3 mol / L hydrochloric acid is used for acidification at a speed of 1000 r / min with stirring, the molar ratio of hydrochloric acid to water glass is 2.1:1, and the mixture is kept warm at 70°C in an electric constant temperature water bath furnace for aging for 1 hour at a pH value of 7-8, and then washed and filtered with distilled water, and then dried at a temperature of 120°C in an electric blast drying oven, ground and broken up through a 120-mesh sieve, and agglomerated particles are removed to obtain modified wollastonite particles.

[0038] The preparation process of a single mass portion of modified wood flour is as follows:

[0039] 75g of 80-mesh wood powder was dried at 105°C to constant weight, methyl methacrylate, butyl methacrylate and styrene were respectively and evenly sprayed on the surface of the wood powder in a fine mist, the addition amount of methyl methacrylate, butyl methacrylate and styrene was 3% of the total amount of wood powder and high-density polyethylene, the wood powder was stirred while spraying, and after spraying, the wood powder was placed at 80°C for 1 hour, and then it was put into a high-speed mixer with 75g of high-density polyethylene and 4.5g of maleic anhydride grafted polyethylene for mixing, and the mixed materials were extruded and granulated in a twin-screw extruder, and the temperatures of each section of the extruder were: the temperature of zone 1 was 150°C, the temperature of zone 2 was 160°C, the temperature of zone 3 was 180°C, the temperature of zone 4 was 180°C, the temperature of zone 5 was 180°C, the temperature of zone 6 was 170°C, the head temperature was 150°C, and the screw speed was 80r / min.

[0040] A method for preparing a low-temperature resistant bale net comprises the following steps:

[0041] S1, wire drawing, heating and melting each raw material, and then feeding it into a wire drawing machine to draw it into filaments;

[0042] S2, weaving, weaving the filaments obtained in S1 into a bale net with a mesh structure through a weaving machine;

[0043] S3, label tape, is pasted on the upper and lower sides of the bale net of S2 at intervals through a label tape machine;

[0044] S4, rolling net, using the winder to roll up the bale net after the winning belt in S3;

[0045] S5. Packaging: put the bale net rolled in S4 into the packaging bag and seal it.

[0046] Test 1: Impact resistance of bale net at low temperature

[0047] Comparative Example 1: A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0048] 65 parts of polypropylene, 25 parts of polyethylene, 13 parts of dioctyl sebacate, 20 parts of bisphenol A epoxy vinyl resin, 10 parts of wollastonite, 12 parts of modified wood powder, and 5 parts of talc.

[0049] Comparative Example 2: A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0050] 65 parts of polypropylene, 25 parts of polyethylene, 13 parts of dioctyl sebacate, 20 parts of bisphenol A epoxy vinyl resin, 12 parts of modified wood powder, and 5 parts of talc.

[0051] The preparation methods of the bale nets in the above comparative examples 1-2 are consistent with the preparation method of Example 1.

[0052] Test method: Use a drop hammer impact tester (100kg drop hammer, height increases from 7 meters at a rate of 2 meters), test the height (m) at which the bale net (3m*4m) breaks under different low temperature environments and record it;

[0053] Test results:

[0054]

[0055] From the test results in the above table, we can see that:

[0056] The difference between Example 1 and Comparative Examples 1-2 is only the addition of wollastonite / modified wollastonite. The comparison of data results shows that whether wollastonite is added or not, pure wollastonite cannot improve the impact resistance of the bale net at low temperatures, while the modified wollastonite can improve the impact resistance of the bale net at low temperatures.

[0057] Test 2: Tensile properties of bale nets at low temperatures

[0058] Test method: Conduct tensile fracture test according to the method in GB / T 8843-2016 "Determination of physical and mechanical properties of fiber ropes", and record the tensile distance (m, rounded) at fracture in the following table;

[0059] Test results:

[0060]

[0061] From the test results in the above table, we can see that:

[0062] When wollastonite is added to the raw materials for preparing bale nets, it can improve the tensile properties of the bale nets at low temperatures to a certain extent. When wollastonite is modified and then added as one of the raw materials for preparing bale nets, the performance can be further improved on the basis of the original improvement effect.

[0063] Test 3: Water resistance of bale net

[0064] Comparative Example 3:

[0065] A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0066] 70 parts of polypropylene, 30 parts of polyethylene, 20 parts of dioctyl sebacate, 25 parts of bisphenol A epoxy vinyl resin, 13 parts of modified wollastonite, 16 parts of wood flour, and 7 parts of talc.

[0067] Comparative Example 4:

[0068] A low temperature resistant bale net, comprising the following raw materials in parts by weight:

[0069] 70 parts of polypropylene, 30 parts of polyethylene, 20 parts of dioctyl sebacate, 25 parts of bisphenol A epoxy vinyl resin, 13 parts of modified wollastonite, and 7 parts of talc.

[0070] The preparation methods of the bale nets in the above comparative examples 3-4 are consistent with the preparation method of Example 2.

[0071] Test method: Test the water resistance according to the method in GB / T 8843-2016 "Determination of physical and mechanical properties of fiber ropes", and record the weight (kg) of the bale net before and after the test in the table below;

[0072] Test results:

[0073]

[0074]

[0075] From the test results in the above table, we can see that:

[0076] After testing, it was found that adding wood powder to the raw materials of the bale net does not have a waterproof effect. Instead, it will greatly increase the water absorption of the bale net. However, adding modified wood powder can significantly improve the water resistance of the bale net.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, internal communication between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the meanings of the above terms in this application can be understood according to specific circumstances.

[0078] The above is a detailed introduction to a low-temperature resistant bale net and a preparation method thereof provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low temperature resistant bale net, characterized in that: The invention comprises the following raw materials in parts by weight: 65-75 parts of polypropylene, 25-35 parts of polyethylene, 13-28 parts of dioctyl sebacate, 20-30 parts of bisphenol A epoxy vinyl resin, 10-16 parts of modified wollastonite, 12-20 parts of modified wood powder, and 5-9 parts of talc.

2. The low temperature resistant bale net according to claim 1, characterized in that: The raw materials of the modified wollastonite include water glass solution, wollastonite powder, polyethylene glycol and hydrochloric acid, wherein the mass ratio of water glass, wollastonite and polyethylene glycol is 5:20:1, and the molar ratio of hydrochloric acid to water glass is 2.1:

1.

3. The low temperature resistant bale net according to claim 2, characterized in that: The specific preparation process of the modified wollastonite is as follows: Add 1250 mesh wollastonite powder and 5% polyethylene glycol to the water glass solution, and mix them into a uniform suspension under the mechanical force of a stirrer at a speed of 300-400 r / min; Then, 3 mol / L hydrochloric acid is used for acidification with stirring at a speed of 1000-1200 r / min, and the mixture is kept warm at 70°C in an electric constant temperature water bath furnace for aging for 1-1.5 hours at a pH value of 7-8, and then the mixture is washed and filtered with distilled water, and then dried at a temperature of 120°C in an electric blast drying oven, ground and broken up through a 120-mesh sieve, and agglomerated particles are removed to obtain modified wollastonite particles.

4. The low temperature resistant bale net according to claim 3, characterized in that: The raw materials of the modified wood powder include 80-mesh wood powder, maleic anhydride grafted polyethylene, high-density polyethylene, methyl methacrylate, butyl methacrylate and styrene, wherein the mass ratio of wood powder, high-density polyethylene and maleic anhydride grafted polyethylene is 50:50:3, and the added amount of methyl methacrylate, butyl methacrylate and styrene is 3% of the total amount of wood powder and high-density polyethylene.

5. The low temperature resistant bale net according to claim 4, characterized in that: The preparation process of the modified wood powder is as follows: The wood powder is dried at a temperature of 105±2°C to constant weight, and methyl methacrylate, butyl methacrylate and styrene are respectively sprayed evenly on the surface of the wood powder in a fine mist form, and the wood powder is stirred while spraying. After the spraying is completed, the wood powder is placed at 80°C for 1 hour, and then it is put into a high-speed mixer for mixing with high-density polyethylene and maleic anhydride grafted polyethylene, and the mixed material is extruded and granulated in a twin-screw extruder.

6. The method for preparing a low temperature resistant bale net according to claim 5, characterized in that: The following steps are involved: S1, wire drawing, heating and melting each raw material, and then feeding it into a wire drawing machine to draw it into filaments; S2, weaving, weaving the filaments obtained in S1 into a bale net with a mesh structure through a weaving machine; S3, label tape, is pasted on the upper and lower sides of the bale net of S2 at intervals through a label tape machine; S4, rolling net, using the winder to roll up the bale net after the winning belt in S3; S5. Packaging: put the bale net rolled in S4 into the packaging bag and seal it.

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