CN114000358A

CN114000358A - Organic pigment packaging bag coating, packaging bag and recovery method thereof

Info

Publication number: CN114000358A
Application number: CN202111321080.7A
Authority: CN
Inventors: 肖于才; 陶文大; 黄明明; 张亮; 徐智勇; 昝建春
Original assignee: Anhui Shenlanhua Color Material Co ltd
Current assignee: Anhui Shenlanhua Color Material Co ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-02-01

Abstract

The invention relates to an organic pigment packaging bag coating, a packaging bag and a recovery method thereof, wherein the packaging bag coating is prepared from the following raw materials: 100 parts of carrier resin, 23-38 parts of dispersing agent, 0.2-0.5 part of compatilizer, 5-8 parts of organic pigment, 6-10 parts of inorganic filler, 0.2-1.0 part of antioxidant and 0.5-3 parts of foaming agent. The packaging bag comprises an inner bag and an outer bag, wherein the inner bag comprises spun-bonded fabric and a coating coated on the spun-bonded fabric, the outer bag is selected from a heat-sealable polyethylene film or a polypropylene film, and the coating is coated on one surface of the spun-bonded fabric close to the outer bag. The packaging bag is crushed, deironized, frozen and dispersed to obtain a finished color masterbatch. The invention can solve the problem of exhausting of powder pigment packaging, improve the pigment packaging efficiency, reduce the production cost and is green and environment-friendly.

Description

Organic pigment packaging bag coating, packaging bag and recovery method thereof

Technical Field

The invention relates to the technical field of organic pigment packaging, mainly relates to the technical field of renewable and recyclable organic pigment packaging bags, and particularly relates to an organic pigment packaging bag coating, a packaging bag and a recycling method thereof.

Background

The product form of organic pigment, such as phthalocyanine blue, is represented by several forms, such as solid powder, color paste, filter cake and the like, wherein the solid powder is most commonly used. The particle size of the solid powder is 0.1-65 mu m, the solid powder has small apparent density, is easy to fly, has low water content, high tinting strength and strong adsorbability, and is easy to pollute the appearance of a package and the field environment, so that the problems in the production and packaging links are different from other inorganic and food powder, a large amount of gas is mixed in ultrafine particles, the ultrafine particles cannot be discharged, the volume of the package bag is too large, the package bag is shaped like a balloon, and the package bag cannot be normally packaged.

The prior packaging technology is as follows: one method is to put phthalocyanine blue powder pigment into two layers of PE inner film bags, coat a layer of paper-plastic composite outer bag, and count three layers of packages, wherein the openings of the inner film bags are tied up by silk film ropes, the outer bag is sealed by sewing and covering wires, and the package specification is 10kg, 20kg and 25 kg. When the feeding of the superfine powder reaches the bag opening, the feeding is stopped, and after the gas in the pigment powder overflows and the volume sinks, the feeding is continued until the specified packaging weight is reached. At the moment, the opening of the inner bag needs to be pre-tied once, the powder in the bag further sinks after more than 60 minutes, and the operations of air exhaust, weight compensation, tying, bag sewing of the outer bag, stacking, warehousing and the like are performed once again. After the finished pigment is delivered to a downstream customer for use, a large number of pigment particles are attached to the inner and outer surfaces of the packaging bag, so that residual coloring agent cannot be effectively utilized. The used packaging bags need to be classified and recycled due to different material types, the separation workload is large, the time consumption is long, the paper-plastic composite outer bag is not easy to recycle and can only be treated as a garbage bag, and the additional value is very low. The separated paper-plastic bag needs to be heated and plasticized or dissolved by a solvent, and then paper sheets and a plastic film are separated again, so that the process is complicated, the energy consumption is high, and the environment is polluted. The key is that downstream manufacturers of the pigment are reluctant to receive paper-plastic composite packages, so phthalocyanine pigment manufacturers urgently need to solve the problems of exhausting and recycling the small packages. The other packaging mode is that a plastic woven bag is adopted and a PE inner film bag is lined. The same problems exist in that the package is difficult to exhaust, the package grade is low, the appearance is not attractive, and the printing is difficult; the residual powder pigment in the bag can not be classified and utilized and the value of the colorant can not be fully exerted, and the additional value of recycling is extremely low.

At present, a plurality of packaging materials and manufacturing methods are patented, and an invention patent with the application number of 201610249712.6 discloses a manufacturing process of a high-barrier high-strength four-layer composite packaging bag, which comprises printing, compounding, curing, slitting, bag making and one-way valve welding and exhausting.

Disclosure of Invention

The inventor believes that the prior organic pigment packaging bag and packaging process have the following defects: (1) the gas in the pigment powder can not be discharged during packaging, and the bag frying and powder leakage are easy to occur; (2) the package is not waterproof and is easy to be dirty; (3) the packing and filling time is long, and the production efficiency is low; (4) the tying rope is easy to be left in the product to generate foreign matters and impurities; (5) the paper bag is difficult to unpack, a metal blade tool is needed, and the tool is easy to leak in the product to cause hidden danger; (6) the packaging bag has high recovery cost, large separation workload, ineffective utilization of residual coloring agents and incapability of efficiently classifying and recycling packaging materials, so that a large amount of materials are wasted, and the environmental protection and resource regeneration are not facilitated. Although a plurality of novel packaging bags appear in recent years, the technology is still imperfect, immature, impractical, environmentally-friendly, high in price and difficult to popularize when applied to packaging organic pigment ultrafine powder.

The technical problem solved by the invention is as follows: the use efficiency, the water resistance and the safety of the existing packaging bag for the organic pigment are required to be improved, and the existing packaging bag for the organic pigment is difficult to recycle, so that resource waste and environmental pollution are caused.

The purpose of the invention is: (1) by improving the high air permeability, high filterability and high tensile strength of the inner bag, the inner bag can be naturally exhausted or quickly exhausted under negative pressure, eliminate gas in the powder pigment and meet the requirement of medium-specification packaging; (2) the compatibility of the inner bag resin system and the outer bag resin system is realized through a micro-foaming pre-dispersion system of the inner bag coating, the coloring power of the pigment is fully displayed, and the purposes of secondary value increment and high-efficiency sustainable recycling of the packaging bag are achieved; (3) the outer bag and the inner bag are made of relatively uniform materials, so that heat sealing, water proofing and light-proof protection are realized, and complicated classification, separation and recovery are avoided; (4) through setting up the bale breaking knob, conveniently bale breaking avoids the foreign matter to bring into in the pigment finished product.

Specifically, aiming at the defects of the prior art, the invention provides a packaging bag suitable for organic pigments, which is prepared by taking spunbonded fabric as an inner bag, coating a micro-foaming pre-dispersion system and taking a polyethylene film as an outer bag, and preparing a recyclable and renewable packaging bag through slitting and ironing, and provides a production process and a recovery method of the packaging bag.

The invention provides an organic pigment packaging bag coating which is characterized by being prepared from the following raw materials:

100 parts by weight of a carrier resin; the carrier resin is selected from one or two of polyethylene powder (PE powder) and polypropylene powder (PP powder), preferably PE powder, and the melt index (MI value) of the carrier resin is 20-50g/10 min;

23-38 parts of a dispersant;

0.2-0.5 parts by weight of compatilizer;

5-8 parts of organic pigment;

6-10 parts of inorganic filler;

0.2-1.0 part by weight of antioxidant; and

0.5-3 parts of foaming agent.

Preferably, in the packaging bag coating, the melt index of the carrier resin is 35-50 g/min. The particle size of the carrier resin is 20-35 meshes.

Preferably, in the above coating for a packaging bag, the raw materials include: 100 parts of carrier resin, 28-38 parts of dispersing agent, 0.2-0.5 part of compatilizer, 6-8 parts of organic pigment, 7-10 parts of inorganic filler, 0.3-0.8 part of antioxidant and 1.0-2.5 parts of foaming agent.

Preferably, in the above coating for a packaging bag, the raw materials include: 100 parts by weight of a carrier resin; 30-38 parts of a dispersant; 0.3-0.5 part by weight of compatilizer, preferably 0.4-0.5 part by weight; 6-8 parts of organic pigment; 8-10 parts of inorganic filler and 0.5-0.8 part of antioxidant; and 1.5 to 3 parts by weight, preferably 2 to 2.5 parts by weight of a foaming agent.

Preferably, in the packaging bag coating, the dispersant is one or more selected from polypropylene wax (PP wax), polyethylene wax (PE wax), polytetrafluoroethylene micro powder wax (PTFE wax) and Fischer-Tropsch wax, and preferably, the dispersant is PE/PTFE mixed micro powder wax, and the mass ratio of PE to PTFE is 100 (0.5-8).

Preferably, in the above coating for a packaging bag, the dispersant is a mixed wax of PE/PTFE, and the mass ratio of PE to PTFE is 100: (1.0-4.0).

Preferably, the dispersant has a D50 particle size of 3-15 μm and a melting point of 100-120 ℃.

Preferably, in the packaging bag coating, the compatilizer is one or two selected from maleic anhydride grafted polyethylene (PE-g-MAH), ethylene acrylic acid copolymer (EAA) and acrylic acid grafted polypropylene (PP-g-AA), and is preferably maleic anhydride grafted polyethylene.

Preferably, in the packaging bag coating, the organic pigment is a pigment special for polyolefin plastics, and is preferably phthalocyanine blue pigment.

Preferably, the phthalocyanine blue pigment is selected from one or two of phthalocyanine series pigments PB15, PB15:1 and PB15: 3; preferably, the pigment is phthalocyanine blue PB15:3, and the D90 particle size is 5-15 μm.

Preferably, in the above coating for a packaging bag, the inorganic filler is selected from light calcium carbonate, magnesium carbonate, nano silica or alumina; preferably, the inorganic filler is light calcium carbonate.

The light calcium carbonate is active calcium, also called colloid calcium carbonate, and the particle size of D90 is 10-25 μm.

Preferably, in the packaging bag coating, the foaming agent is one or two of azodicarbonamide and sodium bicarbonate, preferably a mixture of azodicarbonamide and sodium bicarbonate, and the mass ratio is 1 (1.5-2.5).

Preferably, the foaming agent is a low-temperature foaming agent, the decomposition temperature is less than 145 ℃, the D50 particle size of the azodicarbonamide is controlled to be 5-10 mu m, and the D90 particle size of the sodium bicarbonate is controlled to be 10-25 mu m.

Preferably, the mass ratio of the azodicarbonamide to the sodium bicarbonate is 1:2.

Preferably, in the above coating material for a packaging bag, the antioxidant is one or more selected from the group consisting of phenols, phosphites, and radical scavengers.

Preferably, the antioxidant is gaba-refined GX 2225.

Preferably, in the packaging bag coating, the raw material further comprises 0.2-1.0 part by weight of a bubble regulator, and the bubble regulator is selected from wollastonite fibers, glass fiber powder or carbon fibers; preferably acicular wollastonite fibers with a D97 particle size of 3-15 μm.

Preferably, the cell regulator is 0.3 to 0.9 parts by weight, more preferably 0.7 to 0.9 parts by weight.

The invention also provides a preparation method of the packaging bag coating, which is characterized by comprising the following steps:

mixing and dispersing the raw materials at 90-105 ℃, discharging and cooling, and carrying out freeze grinding to obtain the coating.

Preferably, the mixing and dispersing process comprises the following steps: firstly, sequentially mixing carrier resin powder, a dispersing agent, a compatilizer, phthalocyanine blue, active calcium and an antioxidant at a low speed of 70-350r/min for 2-5min, then adding a foaming agent and a foam pore regulator, controlling the temperature at 90-105 ℃, and mixing at a high speed of 500-850r/min for 5-10 min.

The invention also provides an organic pigment packaging bag which is characterized by comprising an inner bag and an outer bag, wherein the inner bag comprises spun-bonded fabric and the coating coated on the spun-bonded fabric, the outer bag is selected from a heat-sealable polyethylene film or a polypropylene film, and the coating is coated on one surface of the spun-bonded fabric, which is close to the outer bag.

Preferably, in the organic pigment packaging bag, the spunbonded fabric is one or two of polypropylene, polyethylene, terylene and polyurethane non-woven fabrics, preferably polypropylene spunbonded fabric, the air permeability is more than 200mm/s, the fiber diameter is 15-40 μm, and the gram weight is 100-³The MI value is 20-45g/10min, the melting point is 163-178 ℃.

Preferably, in the organic pigment packaging bag, the coating comprises a longitudinal coating and a transverse coating, the blank interval of the longitudinal coating is 10-15cm, and the blank interval of the transverse coating to the edge is 2-4 cm.

Preferably, in the organic pigment packaging bag, the outer bag is an antistatic, easily printable, heat-sealable cast film, and the MI value is 0.3-0.9g/10 min.

Preferably, in the organic pigment packaging bag, the impact strength of the outer bag is 420-550N/cm, the tensile modulus is 350-500MPa, the sealing strength is 40-75N/15mm, and the resistance value is less than 10⁹Omega cm, the film thickness is more than 0.16 mm.

Preferably, in the organic pigment packaging bag, the air permeability of the packaging bag inner bag is 95-170mm/s, preferably 100-150mm/s, and more preferably 120-150 mm/s.

The invention also provides a preparation method of the organic pigment packaging bag, which is characterized by comprising the following steps:

spraying the coating on spunbonded fabric, heating the coating by a far infrared low-temperature oven at 110-155 ℃ for 30-120 seconds, performing semi-plasticizing filling, diffusion homogenization, micro-foaming and cooling to room temperature, condensing and fixing, and rolling to obtain a coating spunbonded fabric material; the coating spun-bonded fabric and the film are respectively placed on a unwinding frame, the materials are discharged at a constant speed and cut, the coating surface of the coating spun-bonded fabric is placed between the inner bag and the outer bag, and the joints of the side parts and the bottom parts of the inner bag and the outer bag are sealed in a heat sealing manner in sequence, so that a finished product of the double-layer packaging bag containing the inner bag and the outer bag is formed.

The invention also provides a method for recovering the packaging bag, which is characterized by comprising the following steps:

and (3) crushing the packaging bag, controlling the crushing granularity to be 3-10 cm, then carrying out secondary crushing, controlling the granularity to be 5-10 mm, and finally carrying out freeze grinding to control the discharge granularity to be 60-100 meshes so as to obtain the color masterbatch finished product.

The invention also provides a color masterbatch which is characterized by being prepared by the recovery method, wherein the tinting strength of the color masterbatch is 100-125%,

the dispersity DH value of the color masterbatch is 2-10, preferably 2-5;

and/or the melt index of the color masterbatch is 10-25g/10min, preferably 14-20g/10 min.

The invention has the advantages that: (1) the problem of exhausting of powder pigment packaging is solved ingeniously, the pigment packaging efficiency is improved, and foreign matters are prevented from entering; (2) the impact strength of the packaging bag is improved, and bag frying and powder leakage are avoided; (3) the pigment is efficiently recycled and packaged, and is converted into a color master colorant, so that the pigment is saved, and the additional value of a regenerated product is improved; (4) high-temperature melting or dissolution recovery of the packaging bag is avoided, the material performance is prevented from being damaged, and the discharge of waste water and waste gas is avoided; (5) the production period of the pigment is shortened, the production cost is reduced, the core competitiveness of the product is improved, and the environmental protection concept of reducing carbon footprint is practiced.

Drawings

Fig. 1 is a schematic cross-sectional view of a packaging bag according to example 1.

FIG. 2 is a flow chart of the manufacturing and recycling process of the packaging bag of example 1.

Fig. 3 is a functional structure diagram of the inner and outer bags of the packaging bag described in embodiment 1.

Detailed Description

In order to solve the problems that the use efficiency and the safety of the existing organic pigment packaging bag need to be improved and the existing organic pigment packaging bag cannot be recycled, the invention provides a recyclable organic pigment packaging bag, and a preparation method and a recycling method thereof.

In a preferred embodiment, the organic pigment packaging bag of the present invention has the following packaging material characteristics:

the first layer of non-woven fabric is a coating spun-bonded fabric which is a commercially available product, the spun-bonded fabric is selected from one or two of polypropylene, polyethylene, terylene and polyurethane non-woven fabric, preferably polypropylene spun-bonded fabric, the fiber diameter is 15-40 mu m, the gram weight is 100-200 g/square meter, the air permeability is more than 200mm/s, the MI value is 20-45g/10min, and the melting point is 163-178 ℃. The middle part of the spun-bonded fabric is subjected to electrostatic spraying to form a pre-dispersing layer, the blank interval of a longitudinal coating is 10-15cm, and the blank interval from a transverse coating to an edge is 2-4cm, so that the heat sealing strength of a hot sewing section of a packaging bag is ensured during subsequent bag making.

The second coating is a micro-foaming pre-dispersing system and comprises 100+ (23-38) + (0.2-0.5) + (5-8) + (6-10) + (0.2-1.0) + (0.5-3) + (0.2-1.0) of carrier resin powder, a dispersing agent, a compatilizer, an organic pigment, an inorganic filler, an antioxidant, a foaming agent and a foam cell regulator. The carrier resin consists of one or two of PE powder and PP powder without additives, preferably PE powder, the melting point is 105-120 ℃, the MI value of the carrier resin is 20-50g/10min, and the granularity is 20-35 meshes; the dispersing agent is one or two of PE micro powder wax, PP micro powder wax, PTFE micro powder wax and Fischer-Tropsch wax, preferably PE/PTFE mixed micro powder wax, the mass ratio of the PE to the PTFE is 100 (0.5-8), the mass ratio is preferably 100 (1.0-4.0), the D50 granularity is 3-15 mu m, and the melting point is 100-120 ℃; the compatilizer is one of PE-g-MAH, EAA or PP-g-AA, preferably PE-g-MAH; the organic pigment is a special pigment for polyolefin plastics, is selected from one or two of phthalocyanine series pigments PB15, PB15:1 and PB15:3, preferably is phthalocyanine blue PB15:3, and has the particle size of D90 being 5-15 mu m; the inorganic filler is selected from one of light calcium carbonate, magnesium carbonate, nano silicon dioxide and alumina, preferably active calcium, also called colloid calcium carbonate, and the D90 particle size is 10-25 μm; the antioxidant is selected from one or more of phenols, phosphorous acid triesters and free radical capturers, and is preferably gasoline-pasteurized GX 2225; the foaming agent is selected from foaming agents mixed by azodicarbonamide and sodium bicarbonate, the mixing ratio is 1:2 (mass ratio), preferably, the low-temperature foaming agent has the decomposition temperature of less than 145 ℃, the D50 granularity of the azodicarbonamide is controlled to be 5-10 mu m, and the D90 granularity of the sodium bicarbonate is controlled to be 10-25 mu m; the foam hole regulator is selected from one of wollastonite fiber, glass fiber powder and carbon fiber, preferably wollastonite needle-shaped fiber, and the D97 particle size is 3-15 μm; the micro-foaming pre-dispersion coating and the spunbonded fabric ensure that an effective honeycomb filter layer is formed and pigment particles are absorbed and recovered, and preferably, the air permeability of the pre-dispersion coating spunbonded fabric is 80-170 mm/s.

The third layer is an antistatic, easily-printed and heat-sealable heavy-duty polyethylene cast film with the impact strength of 420-550N/cm, the tensile modulus of 350-500MPa, the sealing strength of 40-75N/15mm and the resistance value of less than 10⁹Omega cm, film thickness greater than 0.16mm, MI value 0.3-0.9g/10 min.

In another preferred embodiment, the organic pigment packaging bag of the present invention is produced and used as follows:

the first step is as follows: coating:

firstly, preparing a pre-dispersing material: sequentially adding carrier resin powder, a dispersing agent, a compatilizer, phthalocyanine blue, active calcium and an antioxidant into a mixer for wetting and dispersing, firstly mixing at a low speed of 70-350r/min for 2-5 minutes, meanwhile weighing a foaming agent azodicarbonamide and sodium bicarbonate into a self-sealing bag, manually mixing for 5-10 minutes to obtain a mixed foaming agent, then adding the mixed foaming agent and a foam hole regulator into a high-speed mixer, mixing at a high speed of 500 plus 850r/min for 5-10 minutes, controlling the temperature at 90-105 ℃, discharging and cooling, then dispersing by a freezing pulverizer, controlling the working temperature at minus 60-minus 120 ℃, the rotating speed frequency at 25-45 Hz, and sieving by a 150 plus 200-mesh sieve to obtain the coating pre-dispersed material for later use.

Coating treatment of spun-bonded cloth: adding the pre-dispersed materials into a spraying tank, and setting the operation and stop time of electrostatic spraying to be 1-4 seconds and 0.1-0.45 second respectively, the voltage to be 40-60 KV and the air pressure to be 0.5-2 bar. The unreeling speed of the spunbonded fabric is controlled to be 20-80 m/min, and the coating is shielded by an adjustable baffle at the position of 2-4cm of the transverse edge distance so as to ensure the transverse blank distance. And starting the machine, introducing the sprayed spunbonded fabric coating into a far infrared oven, heating the spunbonded fabric coating by the far infrared oven for 30-120 seconds at a low temperature through 110 ℃ to 155 ℃ at the end, and condensing, fixing and rolling the spunbonded fabric coating at room temperature through semi-plasticizing filling, diffusion homogenization, micro-foaming and cooling to obtain the pre-dispersed coated spunbonded fabric.

The second step is that: cutting, ironing and pressing to make bags:

respectively placing the coated spunbonded fabric and the film on a unreeling frame, discharging at a constant speed, cutting, placing the coated surface of the coated spunbonded fabric between an inner bag and an outer bag, sequentially carrying out heat sealing on the joint of the side part and the bottom of the inner bag and the bottom of the outer bag from inside to outside, and controlling the staggered length of the joint to be 15-25 mm to form finished products of the inner and outer packaging bags.

The third step: bagging and packaging pigment: sequentially sleeving an inner bag and an outer bag on a discharging port die and an exhaust port die of a pigment finished product packaging machine, flattening and straightening, then locking the inner bag port and the outer bag port, starting up to discharge, automatically filling, exhausting, metering, performing heat sealing (with a bag-removing button), printing, and warehousing.

In another preferred embodiment, the method for recycling the organic pigment packaging bag of the present invention comprises the following steps:

and regularly and quantitatively recycling the packaging bags used by downstream customers. Putting the packaging bag into a crusher bin, starting the crusher bin, controlling the primary crushing granularity to be 3-10 cm, passing through an iron remover, crushing the packaging bag by a secondary crusher with the granularity controlled to be 5-10 mm, finally performing freeze grinding dispersion, controlling the discharge granularity to be 60-100 meshes, sampling and detecting the application properties such as color tinting strength, dispersibility, temperature resistance, melt index and the like, packaging and warehousing after the packaging bag is qualified, and thus obtaining the color masterbatch finished product.

Preferably, the differences between the PP resin, PP powder and PP wax are: the PP powder is the precursor of PP granular resin, no stabilizer is added, and the PP resin of the spunbonded fabric is polypropylene carrier resin added with an auxiliary agent; the powder is poor in physical property, mechanical property and weather resistance, but good in dispersibility and colorability; the PP wax is low molecular weight polypropylene, has a melting point and viscosity much lower than those of PP resin used for a carrier, has excellent lubricating property and pigment wetting property, is used as a lubricant and a dispersant, and is particularly suitable for producing high-quality pigment color master batches.

The particle size, e.g., D50, D90, is the volume percentage of the particle size, which is a statistical method for detecting the particle size distribution by laser diffraction.

The organic pigment packaging bag coating, the packaging bag and the recycling method thereof according to the present invention will be further described by the following specific examples.

The types of reagents and equipment used in the present invention are shown in the following table:

TABLE 1 reagent and Equipment information Table

Example 1

The cross-sectional schematic view of the packaging bag in this embodiment is shown in fig. 1, and the packaging bag includes three layers, which are sequentially from inside to outside:

the first layer is spun-bonded cloth as a filter layer of the packaging bag. The spunbonded fabric of the present example was polypropylene resin (PP resin).

The second coating is a micro-foaming pre-dispersion system, and the raw materials are shown in table 6, wherein the dispersing agent is PE/PTFE, the mass ratio of the dispersing agent to the PTFE is adjusted to 100:2.0, and the mixed foaming agent is a mixture of azodicarbonamide and sodium bicarbonate, and the mass ratio of the mixed foaming agent to the sodium bicarbonate is 1: 1.5.

The preparation method comprises the following steps:

(1) preparing a pre-dispersing material (namely coating): sequentially adding carrier resin powder, a dispersing agent, a compatilizer, phthalocyanine blue, active calcium and an antioxidant into a mixer for wetting and dispersing, firstly mixing at a low speed of 350r/min for 2 minutes, then adding a foaming agent and a foam pore regulator, mixing at a high speed of 850r/min for 5 minutes, controlling the temperature at 90 ℃, discharging and cooling, introducing into a freezing pulverizer, redispersing at a temperature of 60-120 ℃ below zero and a rotating speed of 25-45 Hz, and sieving by a 150-mesh sieve to obtain a pre-dispersed material for later use.

(2) Spun-bonded fabric coating treatment: adding the pre-dispersed material into a spraying tank of powder electrostatic spraying equipment, and setting the operation and stop time of electrostatic spraying to be 3.5 seconds and 0.45 second respectively, the voltage to be 40KV and the air pressure to be 0.5 bar. The unwinding speed of the spunbonded fabric is controlled to be 20 m/min, the coating is shielded by an adjustable baffle at the position with the transverse edge spacing of 2.5cm so as to ensure the transverse blank spacing, and the longitudinal coating blank spacing is 15 cm. Starting the machine, introducing the spun-bonded cloth coating after spraying into a far infrared oven, passing through a low-temperature oven with the temperature of 110 ℃ (initial stage) -155 ℃ (final stage), performing far infrared heating treatment for 120 seconds, performing semi-plasticizing filling, diffusion homogenization, micro-foaming and cooling to room temperature, condensing, fixing and rolling to form the pre-dispersion coating spun-bonded cloth.

The third layer is a polyethylene film, the impact strength is 420-550N/cm, the tensile modulus is 420MPa, the sealing strength is 51N/15mm, and the resistance is 10⁷Omega cm, film thickness 0.195 mm.

The preparation process and the recovery process flow of the packaging bag are shown in figure 2, and the specific process comprises the following steps: spraying a coating (also called pre-dispersing material) on the spunbonded fabric to form a pre-dispersing layer (also called a coating), forming the coated spunbonded fabric and an anti-static film printed with a mark, unreeling, slitting, sequentially ironing, pressing and sewing an inner bag and an outer bag to obtain a finished bag, then sheathing the bag on a discharge port film, discharging and packaging to form a pigment packaging finished product; and (3) recycling and regenerating the used packaging bag, namely firstly crushing the packaging bag for the first time, removing iron, then crushing the packaging bag for the second time, then performing dispersion treatment by a freezing mill, and obtaining a finished product of the color masterbatch after the performance detection is qualified.

Specifically, the preparation process of the packaging bag in this embodiment is as follows: the coated spunbonded fabric and the polyethylene film are respectively placed on a unreeling frame, the materials are discharged at a constant speed and cut, the coating surface of the coated spunbonded fabric is placed between the spunbonded fabric and the polyethylene film, and the side parts and the bottom parts of the inner bag and the outer bag are heat-sealed sequentially from inside to outside to form the finished products of the inner packing bag and the outer packing bag. The functional structure schematic diagram of the inner bag and the outer bag of the packaging bag is shown in fig. 3, the side part and the bottom part of the bag are heat sewing sections, the inner part of the bag is an exhaust section, the opening part of the bag is a heat sealing section, and a bag disassembling button is arranged.

When pigment is packaged, the inner bag is sleeved on a discharging port die of a pigment finished product packaging machine, the outer bag is sleeved on an exhaust port die of an outer ring of the discharging port die, the inner bag and the outer bag are leveled and straightened, then the inner bag port and the outer bag port are locked, the machine is started to discharge, and exhaust, metering, heat sealing (with a bag-detaching button), code printing and warehousing are carried out while automatic filling is carried out. In the embodiment, the size of the middle exhaust section of the packaging bag is 1167mm x 600mm, omnibearing and large-area exhaust is formed, 25kg of phthalocyanine blue BF435 powder can be loaded into the packaging bag, air mixed with the pigment powder can be rapidly exhausted, the feeding time and the exhaust time are matched, the machine does not need to be stopped for waiting for exhaust, the packaging efficiency is improved, the phenomenon of bag explosion during storage and stacking of finished products is avoided, and material leakage is avoided.

The recycling process of the packaging bag is as follows: pouring out the phthalocyanine blue powder in the packaging bag, leaving about 1.5g of phthalocyanine blue on the packaging bag, directly putting into a crusher bin, starting up, controlling the primary crushing granularity at 8cm, passing through an iron remover, crushing by a secondary crusher, controlling the granularity at 6mm, finally performing freeze grinding dispersion treatment, and controlling the discharge granularity at 80 meshes to obtain the color masterbatch finished product No. 1.

Characterization test:

(1) the coated spunbonded fabric prepared in this example was subjected to air permeability testing:

test the test was repeated 10 times according to the determination of the air permeability of the textile fabric of GB/T5453-1997, the test results being shown in the following table:

TABLE 2 air permeability test results

It can be seen that the average value of the air permeability of the coating spunbonded fabric of the embodiment 1 is 97mm/s, which meets the preferable index of the air permeability of the organic pigment powder package, and ensures that the micro-foaming pre-dispersion coating and the spunbonded fabric form an effective honeycomb filter layer.

(2) The color masterbatch finished product 1# prepared in this example was tested as follows:

firstly, detecting tinting strength (injection molding method):

preparing a standard sample: weighing 250 g of PE or PP granules, adding 0.2 g of liquid paraffin, mixing uniformly, adding 0.5 g of titanium dioxide and 0.05g of pigment BF435, mixing uniformly, and putting into an injection molding machine for molding. The temperature is controlled at 130 ℃ (PE system, the PE powder content in the carrier resin in the embodiment is more than or equal to 50 percent, and the system is suitable for the embodiment) or 200 ℃ (PP system, the carrier resin in the embodiment is the system suitable for the embodiment with the PP powder content more than 50 percent), the first three plates are not needed, the fourth, fifth and sixth color plates are taken as phthalocyanine blue BF435 standard plates, and the average value of the three color plates is taken as a standard sample.

Preparation of a sample: weighing 246.4 g of PE or PP granules, adding 0.2 g of liquid paraffin, mixing uniformly, adding 0.5 g of titanium dioxide and 2.5g of color masterbatch finished product No. 1 (containing 0.05g of pigment), mixing uniformly, and putting into an injection molding machine for board making. The temperature is controlled at 130 ℃ (PE system) or 200 ℃ (PP system), the first three plates are not needed, the fourth, fifth and sixth color plates are taken as the sample plate of the color masterbatch finished product No. 1, and the average value of the three color plates is taken as the sample.

Note 1: 119 g/piece of inner bag spunbonded fabric, 148 g/piece of pre-dispersion coating, 203 g/piece of outer bag spunbonded fabric and 1.5g of residual phthalocyanine blue in the packaging bag;

note 2: the total phthalocyanine blue content (coating pigment mass + residual pigment mass on the pouch)/(inner pouch mass + coating mass + outer pouch mass + residual pigment mass on the pouch) × 100% to 2% (total pigment content of example 1);

note 3: the pigment mass in the color master batch finished product is 2.5g and 2 percent of the total content of phthalocyanine blue and 0.05g

The computer color measurement results are shown in the following table:

TABLE 3 results of tinting strength measurements

Standard sample

Test specimen

ΔL

Δa

Δb

ΔE

ΔC

ΔH

The tinting strength Str%

BF435 standard board

Color master batch finished product 1#

0.89

0.56

-0.32

1.82

0.68

0.42

113.6

In the table, L denotes a brightness value, a denotes a redness value, b denotes a blueness value, E denotes a total color difference, C denotes a color saturation degree, and H denotes a color angle.

Therefore, the tinting strength of the color masterbatch finished product No. 1 is 113.6%, the tinting strength is very excellent, and the additional value of the masterbatch product is improved.

Dispersion test (two-roll method): referring to the HG/T4768.3-2014 standard, the DH value of the color master batch finished product 1# is 5(DH refers to the measurement of difficulty and easiness in pigment dispersion, DH is less than or equal to 5 and is extremely easy to disperse, DH is more than 5 and less than or equal to 10 and is easy to disperse, DH is more than 10 and less than or equal to 20 and is general, and DH is more than 20 and is difficult to disperse), so that the color master batch is extremely easy to disperse and meets the requirement of the chromatic color master batch dispersibility standard;

thirdly, temperature resistance detection (injection molding method): referring to the HG/T4767.4-2014 standard, the results are shown in the following table:

TABLE 4 temperature resistance test

Temperature/. degree.C	180	180	200	240	260	280	300
								Residence time min	0	5	5	5	5	5	5
Value of color difference Δ E	0.00	0.16	0.78	1.14	1.85	2.56	2.97

The result shows that the temperature resistance and color difference of the color masterbatch finished product No. 1 meet the standard requirement within 3.0;

melt index: according to the GBT3682.1-2018 standard, the test result is 21.3g/10min (190 ℃/2.16kgf), and the industrial index of the common melt index of polyolefin color masterbatch is 10-100g/10min (190 ℃/2.16kgf) is met.

Example 2

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:5.0, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1: 2.0. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: sequentially adding carrier resin powder, a dispersing agent, a compatilizer, phthalocyanine blue, active calcium and an antioxidant into a mixer for wetting and dispersing, firstly mixing at a low speed of 120r/min for 4 minutes, then adding a foaming agent and a regulator, mixing at a high speed of 700r/min for 6 minutes, controlling the temperature at 95 ℃, discharging and cooling, redispersing by a freezing pulverizer, and sieving by a 200-mesh sieve, wherein the working condition of the process is the same as that of the process in the embodiment 1 to obtain a pre-dispersed material for later use.

(2) Spun-bonded fabric coating treatment: adding the pre-dispersed material into a spraying tank of powder electrostatic spraying equipment, and setting the running and stopping time of electrostatic spraying to be 1 second and 0.1 second respectively, the voltage to be 60KV and the air pressure to be 2 bar. The unwinding speed of the spunbonded fabric is controlled at 70 m/min, the coating is shielded by an adjustable baffle at the position of 3cm of transverse edge spacing, the transverse blank spacing is ensured, and the longitudinal coating blank spacing is 11.7 cm. And starting the machine, introducing the sprayed spunbonded fabric coating into a far infrared oven, performing low-temperature oven 110 ℃ (initial stage) -155 ℃ (final stage), performing 35-second far infrared external heat treatment, performing semi-plasticizing filling, diffusion homogenization, micro-foaming and cooling to room temperature, condensing, fixing and rolling to form the pre-dispersion coating spunbonded fabric.

The preparation and packaging process of the packaging bag comprises the following steps: the preparation and the packaging are carried out according to the same steps as the example 1, the size of the middle exhaust section of the obtained packaging bag is 1167mm x 600mm, omnibearing and large-area exhaust is formed, when 25kg of phthalocyanine blue BF435 powder material is filled into the packaging bag, air mixed in pigment powder can be rapidly exhausted, the feeding time and the exhaust time are matched, the machine does not need to be stopped for waiting for exhaust, the packaging efficiency is improved, the phenomenon of bag frying during warehousing and stacking of finished products is avoided, and material leakage is avoided.

The recycling process of the packaging bag comprises the following steps: pouring out the phthalocyanine blue powder in the packaging bag, leaving about 1.5g of phthalocyanine blue on the packaging bag, directly putting into a crusher bin, starting up, controlling the primary crushing granularity at 8cm, passing through an iron remover, crushing by a secondary crusher, controlling the granularity at 6mm, finally performing freeze grinding dispersion treatment, and controlling the discharge granularity at 60 meshes to obtain the color masterbatch finished product No. 2.

The method for detecting the performance comprises the following steps: the performance results are shown in Table 5, as in example 1.

Example 3

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:6.0, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1: 2.0. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: sequentially adding carrier resin powder, a dispersing agent, a compatilizer, phthalocyanine blue, active calcium and an antioxidant into a mixer for wetting and dispersing, firstly mixing at 80r/min for 5 minutes at a low temperature, then adding a foaming agent and a regulator, mixing at 600r/min for 10 minutes at a high temperature, controlling the temperature at 100 ℃, discharging and cooling, redispersing by a freezing pulverizer, and sieving by a 150-mesh sieve, wherein the working condition of the method is the same as that of the embodiment 1 to obtain a pre-dispersing material for later use.

(2) Spun-bonded fabric coating treatment: adding the pre-dispersed material into a spraying tank of powder electrostatic spraying equipment, and setting the running and stopping time of electrostatic spraying to be 1 second and 0.1 second respectively, the voltage to be 45KV and the air pressure to be 1.0 bar. The unwinding speed of the spunbonded fabric is controlled at 70 m/min, the coating is shielded by an adjustable baffle at the position with the transverse edge spacing of 4cm, the transverse blank spacing is ensured, and the longitudinal coating blank spacing is 11.7 cm. And starting the machine, introducing the sprayed spunbonded fabric coating into a far infrared oven, performing low-temperature oven 110 ℃ (initial stage) -155 ℃ (final stage), performing 35-second far infrared external heat treatment, performing semi-plasticizing filling, diffusion homogenization, micro-foaming and cooling to room temperature, condensing, fixing and rolling to form the pre-dispersion coating spunbonded fabric.

The recycling process of the packaging bag comprises the following steps: pouring out 25kg of phthalocyanine blue in a packaging bag, leaving about 1.5g of phthalocyanine blue on the packaging bag, directly putting into a crusher bin, starting up, controlling the primary crushing granularity at 8cm, passing through an iron remover, crushing by a secondary crusher to control the granularity at 6mm, and finally performing freeze grinding dispersion treatment to control the discharge granularity at 100 meshes to obtain the finished color masterbatch product No. 3.

Example 4

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:1.0, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1:2. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: sequentially adding carrier resin powder, a dispersing agent, a compatilizer, phthalocyanine blue, active calcium and an antioxidant into a mixer for wetting and dispersing, firstly mixing at 200r/min for 3 minutes at a low temperature, then adding a foaming agent and a regulator, mixing at 500r/min for 8 minutes at a high temperature, controlling the temperature at 105 ℃, discharging and cooling, redispersing by a freezing pulverizer, and sieving by a 150-mesh sieve, wherein the working condition of the method is the same as that of the embodiment 1 to obtain a pre-dispersing material for later use.

(2) Spun-bonded fabric coating treatment: the same procedure as in example 2 was repeated to form a pre-dispersion coated spunbonded fabric.

The preparation and packaging process of the packaging bag comprises the following steps: prepared and packaged according to the same procedure as in example 1.

The recycling process of the packaging bag comprises the following steps: pouring out 25kg of phthalocyanine blue in a packaging bag, leaving about 1.5g of phthalocyanine blue on the packaging bag, directly putting into a crusher bin, starting up, controlling the primary crushing granularity at 8cm, passing through an iron remover, crushing by a secondary crusher to control the granularity at 6mm, and finally performing freeze grinding dispersion treatment to control the discharge granularity at 70 meshes to obtain the color masterbatch finished product No. 4.

Example 5

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:3.0, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1: 2.0. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: the same procedure as in example 4 gave a predispersed material for use.

(2) Spun-bonded fabric coating treatment: the same procedure as in example 3 was repeated to form a pre-dispersion coated spunbonded fabric.

The recycling process of the packaging bag comprises the following steps: pouring out 25kg of phthalocyanine blue in a packaging bag, leaving about 1.5g of phthalocyanine blue on the packaging bag, directly putting the packaging bag into a crusher bin, starting the crusher bin, controlling the primary crushing granularity to be 8cm, passing through an iron remover, crushing the packaging bag by a secondary crusher to be 6mm, finally re-dispersing the packaging bag by a freezing pulverizer, and passing through a 90-mesh sieve, wherein the working condition of the method is the same as that of the embodiment 1, so that the color masterbatch finished product No. 5 is obtained.

Example 6

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:4.0, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1: 2.0. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: the same procedure as in example 3 gave a predispersed material for use.

(2) Spun-bonded fabric coating treatment: the same procedure as in example 1 was repeated to form a pre-dispersion coated spunbonded fabric.

The recycling process of the packaging bag comprises the following steps: pouring out 25kg of phthalocyanine blue in the packaging bag, and recovering about 1.5g of phthalocyanine blue left on the packaging bag according to the method in the embodiment 3 to obtain a color masterbatch finished product 6 #.

Example 7

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:7.0, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1: 2.5. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: the same procedure as in example 2 gave a predispersed material for use.

(2) Spun-bonded fabric coating treatment: and adding the pre-dispersed materials into a spraying tank, and setting the operation and stop time of electrostatic spraying to be 1.35 seconds and 0.2 seconds respectively, the voltage to be 50KV and the air pressure to be 0.5 bar. The unwinding speed of the spunbonded fabric is controlled at 40 m/min, the coating is shielded by an adjustable baffle at the position with the transverse edge spacing of 2cm so as to ensure the transverse blank spacing, and the longitudinal coating blank spacing is 13.3 cm. And starting the machine, introducing the sprayed spunbonded fabric coating into a far infrared oven, passing through a low-temperature oven with the temperature of 110 ℃ (initial stage) -155 ℃ (final stage), carrying out far infrared external heat treatment for 60 seconds, and carrying out semi-plasticizing filling, diffusion homogenization, micro-foaming and cooling to room temperature for condensation, fixation and rolling to obtain the pre-dispersion coating spunbonded fabric.

The preparation and packaging process of the packaging bag comprises the following steps: the preparation and the packaging are carried out according to the same steps as the example 1, the size of the middle exhaust section of the obtained packaging bag is 920mm x 480mm, the omnibearing and large-area exhaust is formed, when 10kg of phthalocyanine blue BF435 powder material is filled into the packaging bag, the air mixed in the pigment powder can be rapidly exhausted, the feeding time and the exhaust time are matched, the machine does not need to be stopped for exhaust, the packaging efficiency is improved, the bag frying phenomenon during the warehousing and stacking of finished products is avoided, and the material leakage is avoided.

The recycling process of the packaging bag comprises the following steps: and pouring out the phthalocyanine blue in the packaging bag, and recovering 0.6g of the phthalocyanine blue left on the packaging bag according to the method in the embodiment 1 to obtain a finished color masterbatch product 7 #.

Example 8

The first and third layers of this example were the same as example 1, and the material for the second coating layer was as shown in table 6, wherein the mass ratio of PE to PTFE in the dispersant was 100:0.5, and the mixed blowing agent was a mixture of azodicarbonamide and sodium bicarbonate at a mass ratio of 1: 2.5. The preparation method comprises the following steps:

(1) preparing a pre-dispersing material: the same procedure as in example 1 gave a predispersed material for use.

(2) Spun-bonded fabric coating treatment: and adding the pre-dispersed materials into a spraying tank, and setting the operation and stop time of electrostatic spraying to be 1.5 seconds and 0.2 seconds respectively, the voltage to be 40KV and the air pressure to be 0.8 bar. The unwinding speed of the spunbonded fabric is controlled at 42 m/min, the coating is shielded by an adjustable baffle at the position with the transverse edge spacing of 2.5cm, the transverse blank spacing is ensured, and the longitudinal coating blank spacing is 14 cm. And starting the machine, introducing the sprayed spunbonded fabric coating into a far infrared oven, passing through a low-temperature oven with the temperature of 110 ℃ (initial stage) -155 ℃ (final stage), carrying out far infrared heating treatment for 57 seconds, carrying out semi-plasticizing filling, diffusion homogenization, micro-foaming, cooling to room temperature, condensing, fixing and rolling to obtain the pre-dispersion coating spunbonded fabric.

The preparation and packaging process of the packaging bag comprises the following steps: the packaging bag is prepared according to the same steps as the embodiment 1, the size of the middle exhaust section of the packaging bag is 1050mm x 550mm, omnibearing and large-area exhaust is formed, when 20kg of phthalocyanine blue is filled into the packaging bag, air mixed with the pigment powder can be rapidly exhausted, the feeding time and the exhausting time are matched, the packaging bag does not need to be stopped for waiting for exhausting, the packaging efficiency is improved, the bag frying phenomenon of the finished product during warehousing and stacking is avoided, and material leakage is avoided.

The recycling process of the packaging bag comprises the following steps: and pouring out the phthalocyanine blue in the packaging bag, and recovering 0.9g of the phthalocyanine blue left on the packaging bag according to the method in the embodiment 2 to obtain a finished color masterbatch product No. 8.

Example 9

The recycling process of the packaging bag comprises the following steps: pouring out 25kg of phthalocyanine blue in the packaging bag, and recovering about 1.5g of phthalocyanine blue left on the packaging bag according to the method in the embodiment 1 to obtain a color masterbatch finished product 9 #.

Comparative example 1

The first and third layers of this comparative example were the same as in example 1, and the materials for the second coating material were as shown in Table 6, wherein the melt index of the PE powder used was 70g/10 min.

The method for detecting the performances of the comparative example comprises the following steps: the performance results are shown in Table 5, as in example 1. The air permeability is too high, and the micro-foaming pre-dispersion coating and the spunbonded fabric cannot form an effective honeycomb filter layer, so that material leakage and package pollution are caused during air exhaust; the coloring power and the dispersibility of the color masterbatch obtained by recycling the packaging bag are obviously poor, the color masterbatch does not meet the performance requirement of the color masterbatch, the color masterbatch can not be used as a coloring agent with high added value, and the purposes of secondary added value, high efficiency and sustainable recycling of the packaging bag can not be achieved.

Comparative example 2

This comparative example is similar to example 1 except that the raw materials of the coating materials are shown in table 6.

The method for detecting the performances of the comparative example comprises the following steps: the performance results are shown in Table 5, as in example 1. The color masterbatch obtained by recycling the packaging bag has obviously poor tinting strength and dispersibility, does not meet the performance requirement of the color masterbatch, cannot be used as a colorant with high added value, and cannot achieve the aims of secondary value increase, high efficiency and sustainable recycling of the packaging bag.

Comparative example 3

The method for detecting the performance comprises the following steps: the performance results are shown in Table 5, as in example 1. The air permeability is too low, so that normal exhaust cannot be realized, the feeding time and the exhaust time are contradictory, and the machine needs to be stopped for waiting for exhaust; the color masterbatch obtained by recycling the packaging bag has poor tinting strength, dispersibility and temperature resistance, does not meet the performance requirement of the color masterbatch, cannot be used as a colorant with high added value, and cannot achieve the aims of secondary value increment, high efficiency and sustainable recycling of the packaging bag.

TABLE 5 summary of the results of the measurements of the comparative examples and examples

In conclusion, the preparation process of the packaging bag disclosed by the invention ingeniously solves the problem of air exhaust of powder pigment packaging, improves the pigment packaging efficiency and avoids the entry of foreign matters; the recycling process can convert the packaging bag into a color master colorant, so that the pigment is saved, and the additional value of a regenerated product is improved; the invention can shorten the production period of the pigment, reduce the production cost and is green and environment-friendly.

TABLE 6 raw material compositions of examples and comparative examples

Claims

1. The organic pigment packaging bag coating is characterized by being prepared from the following raw materials:

100 parts by weight of a carrier resin; the carrier resin is selected from one or two of polyethylene powder or polypropylene powder, and the melt index of the carrier resin is 20-50g/10 min;

23-38 parts of a dispersant;

0.2-0.5 parts by weight of compatilizer;

5-8 parts of organic pigment;

6-10 parts of inorganic filler;

0.2-1.0 part by weight of antioxidant; and

0.5-3 parts of foaming agent.

2. The organic pigment packaging bag coating according to claim 1, wherein the raw materials comprise: 100 parts of carrier resin, 28-38 parts of dispersing agent, 0.2-0.5 part of compatilizer, 6-8 parts of organic pigment, 7-10 parts of inorganic filler, 0.3-0.8 part of antioxidant and 1.0-2.5 parts of foaming agent.

3. The organic pigment packaging bag coating according to claim 1 or 2, wherein the dispersant is one or more selected from the group consisting of polypropylene wax, polyethylene wax, polytetrafluoroethylene micro powder wax and Fischer-Tropsch wax, and preferably, the dispersant comprises polyethylene wax and polytetrafluoroethylene micro powder wax, and the mass ratio of the polyethylene wax to the polytetrafluoroethylene micro powder wax is 100 (0.5-8), and preferably, the mass ratio is 100: (1.0-4.0).

4. The organic pigment packaging bag coating according to any one of claims 1 to 3, wherein the compatibilizer is one or two selected from maleic anhydride grafted polyethylene, ethylene acrylic acid copolymer, acrylic acid grafted polypropylene, preferably maleic anhydride grafted polyethylene.

5. The organic pigment packaging bag coating according to any one of claims 1 to 4, wherein the organic pigment is a polyolefin plastic special pigment, preferably a phthalocyanine blue pigment.

6. The organic pigment bag coating according to any one of claims 1 to 5, wherein the inorganic filler is selected from the group consisting of light calcium carbonate, magnesium carbonate, nano silica or alumina; preferably, the inorganic filler is light calcium carbonate.

7. The organic pigment packaging bag coating according to any one of claims 1 to 6, wherein the foaming agent is one or two selected from azodicarbonamide and sodium bicarbonate, preferably a mixture of azodicarbonamide and sodium bicarbonate, and the mass ratio is 1 (1.5-2.5).

8. The organic pigment packaging bag coating according to any one of claims 1 to 7, wherein the raw material further comprises 0.2 to 1.0 part by weight of a cell regulator selected from wollastonite fibers, glass fiber powder or carbon fibers.

9. The method for preparing the organic pigment packaging bag coating of any one of claims 1 to 8, characterized by comprising the steps of:

mixing and dispersing the raw materials at 90-105 ℃, discharging and cooling, and freezing and grinding to obtain the coating.

10. An organic pigment packaging bag, comprising an inner bag and an outer bag, wherein the inner bag comprises a spun bond cloth and the coating material of any one of claims 1 to 8 coated on the spun bond cloth, the outer bag is selected from a heat-sealable polyethylene film or a polypropylene film, and the coating material is coated on one surface of the spun bond cloth close to the outer bag.

11. The organic pigment packaging bag according to claim 10, wherein the air permeability of the inner bag of the packaging bag is 95-170mm/s, preferably 100-150mm/s, and more preferably 120-150 mm/s.

12. The method for recycling the organic pigment packaging bag according to claim 10 or 11, comprising the steps of:

and (3) crushing the packaging bag, controlling the crushing granularity to be 3-10 cm, then performing secondary crushing, controlling the granularity to be 5-10 mm, and finally performing freeze grinding to control the discharge granularity to be 60-100 meshes to obtain the color masterbatch finished product.

13. The color masterbatch is characterized by being prepared by the recycling method in claim 12, wherein the tinting strength of the color masterbatch is 125%;

the dispersity DH value of the color masterbatch is 2-10, preferably 2-5;