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CN-122011437-A - Preparation method of PE anti-fog droplet master batch composition

CN122011437ACN 122011437 ACN122011437 ACN 122011437ACN-122011437-A

Abstract

The application relates to a preparation method of a PE anti-fog droplet master batch composition, and relates to the technical field of preparation of high polymer material functionalized assistants. The preparation method adopts the processes of adsorption, end-capping and redispersion, namely, firstly, the liquid compound anti-fog drop agent is adsorbed in the pores of the porous carrier in vacuum, then the microcapsule end-capping agent is heated and melted and quenched, a high-crystallinity coating layer is constructed on the surface of the carrier in situ, and finally, the high-crystallinity coating layer and the matrix resin are mixed and granulated. The application solves the problems of processing slip and master batch adhesion caused by easy precipitation of liquid auxiliary agent under high filling amount through the microcapsule structure, realizes the controlled release of the anti-fog drop agent by utilizing the physical barrier effect of the end-capping layer, takes the quick action and the long-acting property of the film into account, and improves the optical performance and the service life of the agricultural film.

Inventors

  • FAN GUANGRONG
  • LIN LONG
  • QIN JUNHUI
  • Deng Zishi

Assignees

  • 中山市康迈新材料有限公司

Dates

Publication Date
20260512
Application Date
20260312

Claims (10)

  1. The preparation method of the PE anti-fog droplet master batch composition is characterized by comprising the following steps of: S1, preparing raw materials, namely, 40-70 parts of polyethylene matrix resin, 20-30 parts of compound anti-fog drop agent, 5-20 parts of porous adsorption carrier, 2-6 parts of microcapsule end capping agent and 1-5 parts of functional auxiliary agent; s2, preheating the carrier, namely adding the porous adsorption carrier into mixing equipment, and stirring and preheating at the temperature of 45-55 ℃; S3, carrying out load adsorption, namely keeping the temperature at 45-55 ℃, spraying the compound anti-fog drop agent into the mixing equipment, and mixing with the porous adsorption carrier to enable the compound anti-fog drop agent to be adsorbed in the pores of the porous adsorption carrier; S4, in-situ end capping, namely adding the microcapsule end capping agent into the mixture obtained in the step S3, raising the temperature of mixing equipment to 95-110 ℃, stirring to enable the microcapsule end capping agent to be melt coated on the surface of the porous adsorption carrier, and then rapidly cooling the material to below 40 ℃ to obtain modified powder; S5, mixing the matrix, namely uniformly mixing the modified powder obtained in the step S4 with the polyethylene matrix resin and the functional auxiliary agent under the condition that the temperature is lower than 45 ℃ to obtain a premix; and S6, extruding and granulating, namely adding the premix into a double-screw extruder, performing melt extrusion at the temperature of 100-160 ℃, and granulating and drying to obtain the PE anti-fog-drop master batch.
  2. 2. The method of preparing a PE anti-fog drip master batch composition according to claim 1, wherein the microcapsule end-capping agent is selected from one or more of high density polyethylene wax, oxidized polyethylene wax or polypropylene wax; And the melting point range of the microcapsule end-capping agent is 90-115 ℃, and the crystallinity is more than 80%.
  3. 3. The method for preparing a PE anti-fog droplet master batch composition according to claim 1, wherein the porous adsorption carrier is porous silica or diatomite, the dibutyl phthalate oil absorption value is 200-350 ml/100g, and the average particle size is 5-15 μm.
  4. 4. The preparation method of the PE anti-fog droplet master batch composition according to claim 1, wherein the compound anti-fog droplet is prepared by compounding a sorbitan fatty acid ester compound and a polyglycerol fatty acid ester compound according to a mass ratio of 1:1-1:3; The polyethylene matrix resin is low-density polyethylene or linear low-density polyethylene with the melt mass flow rate of 2.0-20.0 g/10 min.
  5. 5. The method for preparing a PE anti-fog droplet master batch composition according to claim 1, wherein in step S3, the adding manner of the compound anti-fog droplet is as follows: and preheating the compound anti-fog drop to 40 ℃, and spraying the compound anti-fog drop into mixing equipment at a speed of 1.0-2.0 kg/min through a spraying device.
  6. 6. The method for producing a PE anti-fog droplet master batch composition according to claim 5, wherein in step S3, a vacuum negative pressure state with an absolute pressure of 0.06-0.08 MPa is maintained inside the mixing apparatus.
  7. 7. The method for preparing a PE anti-fog droplet master batch composition according to claim 1, wherein in step S4, the process of raising the temperature of the mixing device to 95-110 ℃ and stirring is specifically as follows: Setting the stirring rotation speed to 800-1200 rpm, and mixing for 3-5 minutes.
  8. 8. The method for preparing a PE anti-fog droplet master batch composition according to claim 1, wherein in step S4, the process of rapidly cooling the material to a temperature below 40 ℃ is specifically: And discharging the materials into a low-speed cold mixer, and cooling for 5-10 minutes under the conditions of a rotating speed of 200-400 rpm and circulating cooling water at 10-20 ℃.
  9. 9. The method for producing a PE anti-fog droplet master batch composition according to claim 1, wherein in step S6, the temperatures of each section of the twin-screw extruder are set as follows: The conveying section is 100-120 ℃, the melting plasticizing section is 130-145 ℃, the dispersing mixing section is 145-160 ℃, and the metering extrusion section and the die head are 140-150 ℃.
  10. 10. The method for preparing a PE anti-fog droplet master batch composition according to claim 1, wherein in step S6, the length-diameter ratio of the twin-screw extruder is 36:1-48:1, and the devolatilization is performed through a vacuum vent in the extrusion process, and the vacuum degree is not lower than 0.06MPa.

Description

Preparation method of PE anti-fog droplet master batch composition Technical Field The application relates to the technical field of preparation of polymer material functionalized assistants, in particular to a preparation method of a PE anti-fog droplet master batch composition. Background Polyethylene films are widely used in agricultural facility cultivation fields such as greenhouse films and mulching films due to their excellent light transmittance, heat preservation and processability. However, polyethylene belongs to a nonpolar polymer material, has low surface energy, and is extremely easy to condense water vapor on the inner surface of a film to form fine mist drops in a humid environment. These droplets not only prevent sunlight from transmitting and reduce photosynthesis efficiency, but also may drip onto crops to induce disease. Therefore, the addition of a surfactant type antifogging agent to a polyethylene film to migrate to the film surface to reduce the contact angle of water is currently the main means for solving this problem. Most of high-efficiency anti-fog drops are in a liquid state or a semi-solid state paste state at normal temperature, so that the anti-fog drops are difficult to disperse and easily cause slipping of a charging port when being directly added into resin, and therefore, the anti-fog drops are generally prepared into high-concentration anti-fog drop master batches and then are mixed with matrix resin for film blowing in industry. Although masterbatch technology improves charging operability to some extent, the prior art still faces many challenges in the trend of pursuing high loadings and high performance agricultural films. First, liquid anti-fog drops have limited compatibility with the polyethylene matrix and are extremely susceptible to thermomigration in the high temperature, high shear environment of the extrusion process. When the content of the anti-fog agent in the master batch is higher, the liquid auxiliary agent which is heated and expanded easily seeps out from the traditional physical adsorption carrier, and a lubricating layer is formed between the extruder screw and the machine barrel, so that the screw slips, the current of a host machine fluctuates and the extrusion amount is unstable, and the production efficiency and the product quality of the master batch are seriously restricted. In addition, the surface exudation auxiliary agent can cause the adhesion and agglomeration among master batch particles, and inconvenience is brought to the subsequent storage, transportation and metering mixing. Secondly, in order to adsorb more liquid auxiliaries, the prior art often uses porous silica or diatomaceous earth as a carrier. However, liquid bridge force is very easy to generate among inorganic carrier particles absorbing a large amount of liquid organic matters, so that serious secondary agglomeration phenomenon is caused, the agglomeration is difficult to open by shearing force in the subsequent film blowing process, a large amount of crystal points are finally formed in the film, the haze of the film is increased, the light transmittance is reduced, the requirements of high-end agricultural films on illumination conditions cannot be met, and more importantly, the migration rate of anti-fog drops cannot be regulated and controlled by the traditional physical mixing or simple adsorption process. In the initial stage of film use, anti-fog drop agent often appears quick precipitation, and the quick effect is but run off, leads to the anti-fog drop duration of film to be far lower than its mechanical life, is difficult to realize the long-term functionalization of agricultural film. Therefore, developing a PE anti-fog drip master batch which can realize high-concentration stable filling and also can give consideration to processing rheological property, optical performance and long-acting slow release mechanism and a preparation technology thereof becomes a technical problem to be solved urgently in the industry. Disclosure of Invention The application aims to provide a preparation method of a PE anti-fog droplet master batch composition, which aims to solve the problems of processing slip and master batch adhesion caused by easy precipitation of a liquid auxiliary agent in the preparation process of the existing high-concentration anti-fog droplet master batch, and short anti-fog droplet duration and poor optical performance caused by uncontrolled release of the auxiliary agent and agglomeration of a carrier in film application. By adopting the technical scheme, the invention is realized by the following technical scheme that the preparation method of the PE anti-fog droplet master batch composition comprises the following steps: the invention provides a preparation method of a PE anti-fog droplet master batch composition, which comprises the following steps: S1, preparing raw materials, namely, 40-70 parts of polyethylene matrix resin, 20-30 parts of compou