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CN-122011621-A - Lodging-resistant modified plastic plant bracket and preparation method thereof

CN122011621ACN 122011621 ACN122011621 ACN 122011621ACN-122011621-A

Abstract

The invention discloses an anti-lodging modified plastic plant bracket and a preparation method thereof, wherein a bracket main body is prepared from modified plastic, and the modified plastic comprises, by weight, 100 parts of PVC resin, 13-15 parts of ACR resin, 19-21 parts of modified toughening agent, 10-12 parts of inorganic filler, 2.8-3.1 parts of heat stabilizer, 0.11-0.12 part of antioxidant, 0.32-0.38 part of lubricant, 0.5-0.8 part of ultraviolet resistance agent and 0.3-0.5 part of antibacterial agent. A preparation method of a lodging-resistant modified plastic plant bracket. The modified plastic prepared by the invention has excellent comprehensive mechanical properties, namely, the tensile strength can reach 38.2-45.3MPa, the bending strength can reach 52.3-61.5MPa, the impact strength can reach 12.5-16.7kJ/m <2 >, and the mechanical properties are in a steady optimization trend along with reasonable increase of the dosage of ACR resin and modified toughening agent, so that the bracket is ensured to have enough rigidity to support plants, toughness to resist external impact, and a solid foundation is laid for anti-lodging performance.

Inventors

  • ZHANG QINGHUA
  • SI CHONGDIAN
  • ZHANG GONGGUO
  • SHI XIAONAN

Assignees

  • 山东三才机械设备有限公司

Dates

Publication Date
20260512
Application Date
20260310

Claims (10)

  1. 1. The anti-lodging modified plastic plant bracket is characterized in that a bracket main body is prepared from modified plastic, wherein the modified plastic comprises, by weight, 100 parts of PVC resin, 13-15 parts of ACR resin, 19-21 parts of modified toughening agent, 10-12 parts of inorganic filler, 2.8-3.1 parts of heat stabilizer, 0.11-0.12 part of antioxidant, 0.32-0.38 part of lubricant, 0.5-0.8 part of ultraviolet resistance agent and 0.3-0.5 part of antibacterial agent.
  2. 2. The lodging-resistant modified plastic plant support of claim 1, wherein the modified toughening agent is prepared by the following steps: Preparing an alkaline ethanol solution by using sodium hydroxide, introducing nitrogen for protection, adding tung oil, stirring and emulsifying at a high speed, heating to 78-82 ℃, refluxing and stirring for 4.2-4.8 hours, removing ethanol by reduced pressure rotary evaporation, adding hydrochloric acid for acidification, centrifuging, taking an organic phase, washing with water and drying to obtain a tung oil hydrolysate; Step 2, mixing benzoin dimethyl ether with acetone, adding tung oil hydrolysate and dithioglycol, mixing uniformly, controlling the temperature in a water bath to be 42-48 ℃, adding 420-480W/m < 2 > of ultraviolet radiation, stirring for reaction for 1.7-2.0h, removing the acetone by rotary evaporation after the reaction is finished, washing an organic phase by rotary evaporation substrate water, and drying to obtain a comb-shaped oligomeric matrix; and 3, uniformly mixing the comb-shaped oligomeric matrix, methanol and stannous oxide, introducing nitrogen to be pressurized to 4.0-4.4bar, heating to 102-108 ℃, carrying out pressure reaction for 1.6-1.9h, and removing the methanol by rotary evaporation after the reaction is finished to obtain the modified toughening agent.
  3. 3. The lodging-resistant modified plastic plant support according to claim 2, wherein in the step 1, the volume ratio of tung oil to alkaline ethanol solution is 1:4.5-5.0, the mass fraction of ethanol in the alkaline ethanol solution is 38-42%, and the pH value is not lower than 12.
  4. 4. The lodging-resistant modified plastic plant support according to claim 2, wherein in the step 2, the usage amount ratio of tung oil hydrolysate, dithioglycol, benzoin dimethyl ether and acetone is 50g:0.24-0.26mol:0.09-0.10g:110-120mL.
  5. 5. The lodging-resistant modified plastic plant stent of claim 2, wherein in step 3, the comb-shaped oligomeric matrix, methanol and stannous oxide are used in an amount ratio of 50g:75-85mL:8.5-9.5mg.
  6. 6. The lodging-resistant modified plastic plant bracket according to claim 1 is characterized in that the inorganic filler is selected from any one of titanium dioxide and light calcium powder compounded according to a mass ratio of 1:2-3, talcum powder and heavy calcium powder compounded according to a mass ratio of 1:1.5-2.5, kaolin and dolomite powder compounded according to a mass ratio of 1:2-3, diatomite and quartz powder compounded according to a mass ratio of 1:1.8-2.2 and bentonite and feldspar powder compounded according to a mass ratio of 1:2.0-2.5.
  7. 7. The lodging-resistant modified plastic plant support according to claim 1, wherein the heat stabilizer is any one selected from the group consisting of a calcium zinc heat stabilizer, an organic tin heat stabilizer and a lead salt heat stabilizer, and the antioxidant is any one selected from the group consisting of an antioxidant 1010, an antioxidant 1076 and an antioxidant 168.
  8. 8. The lodging-resistant modified plastic plant support according to claim 1, wherein the lubricant is selected from any one of butyl stearate, zinc stearate and paraffin wax, the ultraviolet resistant agent is selected from any one of UV-531, UV-327 and UV-326, and the antibacterial agent is selected from any one of nano zinc oxide, nano silver and antibacterial zeolite.
  9. 9. The lodging-resistant modified plastic plant support of claim 1, wherein 0.2-0.4 parts of green master batch is further added into the modified plastic.
  10. 10. A method for preparing the lodging-resistant modified plastic plant support according to claim 1, which is characterized by comprising the following steps: Step S1, preparing a modified toughening agent, namely sequentially completing tung oil hydrolysis, comb-shaped oligomeric matrix preparation and methyl ester end capping reaction according to the preparation method of the modified toughening agent of claim 1 to obtain the modified toughening agent for later use; s2, raw materials are mixed, namely, the PVC resin, the ACR resin, the modified toughening agent, the inorganic filler, the heat stabilizer, the antioxidant, the lubricant, the ultraviolet resistant agent and the antibacterial agent are weighed according to parts by weight, if color master batches are required to be added, the color master batches are synchronously weighed, all the raw materials are added into a high-speed mixer, and the mixture is mixed for 15-20min under the conditions of the rotating speed of 800-1000r/min and the temperature of 80-90 ℃ to obtain a uniform mixture; S3, carrying out heat kneading treatment, namely transferring the mixture obtained in the step 2 into a kneader, and carrying out heat kneading for 10-12min at the temperature of 105-110 ℃ and the rotating speed of 300-400r/min, wherein the heat kneading discharging temperature is controlled at 92-98 ℃ to obtain a kneaded material; Step S4, melt extrusion granulation, namely feeding the kneaded material obtained in the step 3 into a double-screw extruder, and carrying out melt extrusion and granulating to obtain modified plastic particles, wherein the temperature zone of a charging barrel of the double-screw extruder is set to be a first zone 172-178 ℃, a second zone 182-188 ℃, a third zone 192-198 ℃, a fourth zone 192-198 ℃, a fifth zone 187-193 ℃, a sixth zone 182-188 ℃, the die temperature is 190 ℃ and the screw rotating speed is 200-250r/min; S5, injection molding, namely feeding the modified plastic particles obtained in the step 4 into an injection molding machine, performing injection molding according to a preset bracket main body mold, wherein the injection molding temperature is 180-200 ℃, the injection molding pressure is 80-100MPa, the dwell time is 15-20S, cooling and shaping, and demolding to obtain each bracket component; And S6, assembling the components of the bracket obtained in the step 5 to obtain the lodging-resistant modified plastic plant bracket.

Description

Lodging-resistant modified plastic plant bracket and preparation method thereof Technical Field The invention relates to a plant bracket and a preparation method thereof, in particular to an anti-lodging modified plastic plant bracket and a preparation method thereof. Background In the plant cultivation process, especially in the plant with fine stalks, higher plants or heavier results, such as fruits, vegetables, flowers, seedlings and the like, the plant is easy to fall down during the growth period under the influence of natural factors such as wind power, rainwater and the like, so that the stalks are broken, the fruits fall off, the plants grow in a malformation manner, and the crop yield and the quality are seriously influenced. To solve this problem, plant holders are widely used in agricultural production and gardening. The plant brackets on the market at present are mainly divided into three types of wood brackets, metal brackets and common plastic brackets. The wood bracket has the advantages of low cost, fragile material, easy decay, short service life, consumption of a large amount of wood, no environment-friendly requirement, high strength of the metal bracket, good lodging prevention effect, large weight, inconvenient carrying and installation, easy rust corrosion, pollution to soil after long-term use, high cost, light weight, convenient carrying and corrosion resistance of the common plastic bracket, defects of insufficient rigidity and poor toughness, easy fracture and deformation when impacted by external force, poor lodging prevention performance, and difficulty in meeting the supporting requirements of high plants and heavy-load plants. Meanwhile, the existing modified plastic bracket has the defects of multiple emphasis and single performance improvement, or only simple addition of filler to enhance rigidity, so that the bracket is either too strong in rigidity and insufficient in toughness, or better in toughness but insufficient in rigidity, and the high strength, impact resistance and bending resistance required by lodging prevention cannot be considered. In addition, the preparation process of the partially modified plastic bracket is unreasonable, the raw materials are mixed unevenly, the processing temperature is controlled improperly, and the mechanical property and the service life of the bracket are further affected. Therefore, research and development of a lodging-resistant modified plastic plant support with high strength, high toughness and corrosion resistance is a technical problem to be solved in the field of current plant cultivation auxiliary equipment. Disclosure of Invention In order to solve the defects of the technology, the invention provides the lodging-resistant modified plastic plant bracket and the preparation method thereof, and the lodging problem in the plant growth process is solved by optimizing modified plastic to meet the performance requirements of high strength, high toughness and corrosion resistance of the bracket. In order to solve the technical problems, the technical scheme adopted by the invention is that the anti-lodging modified plastic plant support is prepared from, by weight, 100 parts of PVC resin, 13-15 parts of ACR resin, 19-21 parts of modified toughening agent, 10-12 parts of inorganic filler, 2.8-3.1 parts of heat stabilizer, 0.11-0.12 part of antioxidant, 0.32-0.38 part of lubricant, 0.5-0.8 part of ultraviolet resistance agent and 0.3-0.5 part of antibacterial agent. Preferably, the preparation process of the modified toughening agent comprises the following steps: Preparing an alkaline ethanol solution by using sodium hydroxide, introducing nitrogen for protection, adding tung oil, stirring and emulsifying at a high speed, heating to 78-82 ℃, refluxing and stirring for 4.2-4.8 hours, removing ethanol by reduced pressure rotary evaporation, adding hydrochloric acid for acidification, centrifuging, taking an organic phase, washing with water and drying to obtain a tung oil hydrolysate; Step 2, mixing benzoin dimethyl ether with acetone, adding tung oil hydrolysate and dithioglycol, mixing uniformly, controlling the temperature in a water bath to be 42-48 ℃, adding 420-480W/m < 2 > of ultraviolet radiation, stirring for reaction for 1.7-2.0h, removing the acetone by rotary evaporation after the reaction is finished, washing an organic phase by rotary evaporation substrate water, and drying to obtain a comb-shaped oligomeric matrix; and 3, uniformly mixing the comb-shaped oligomeric matrix, methanol and stannous oxide, introducing nitrogen to be pressurized to 4.0-4.4bar, heating to 102-108 ℃, carrying out pressure reaction for 1.6-1.9h, and removing the methanol by rotary evaporation after the reaction is finished to obtain the modified toughening agent. The modified toughening agent is prepared by taking tung oil as a core raw material through three steps of controllable reactions: 1. The main component of tung oil is tri-fatty acid g