CN114230890A - Special aquaculture membrane suitable for Guangdong area - Google Patents

Special aquaculture membrane suitable for Guangdong area Download PDF

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CN114230890A
CN114230890A CN202111441286.3A CN202111441286A CN114230890A CN 114230890 A CN114230890 A CN 114230890A CN 202111441286 A CN202111441286 A CN 202111441286A CN 114230890 A CN114230890 A CN 114230890A
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王洪琼
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Guangdong Huifa Plastic Industry Technology Co ltd
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
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    • C08J7/06—Coating with compositions not containing macromolecular substances
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    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K2003/2231—Oxides; Hydroxides of metals of tin
    • G—PHYSICS
    • G01—MEASURING; TESTING
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    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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Abstract

The invention discloses a special aquaculture membrane suitable for Guangdong areas and a preparation method thereof, wherein the special aquaculture membrane comprises a five-layer membrane structure: the anti-fogging coating comprises an LDPE film substrate layer, an anti-fogging layer, an antibacterial layer, a tin-oxygen nano heat-insulating breathable layer and a hydrophobic coating; the preparation method adopts LLDPE, LDPE and metallocene polyethylene as LDPE film matrix, and has excellent chemical stability and heat sealability by combining with infrared temperature control film blowing technology; the atomization of the film can be prevented by adding an anti-atomization agent, a resin modifier and the like, the film is not easy to age and has long service life, and the good antibacterial performance can be exerted by adding a trace amount of antibacterial agent; the tin-oxygen nanometer heat-insulation breathable layer is obtained through immersion, the surface-sprayed hydrophobic coating is more suitable for the climatic environment of Guangdong regions, high temperature resistance, good breathability, water resistance and moisture resistance are achieved, the oxidation resistance and aging resistance of the existing special culture film are improved, white pollution caused by frequent replacement is avoided, and the energy-saving and environment-friendly degree of the environment is improved.

Description

Special aquaculture membrane suitable for Guangdong area
Technical Field
The invention relates to the technical fields of coating film technology, novel film material technology, energy conservation and environmental protection, in particular to a special film for aquaculture in Guangdong area.
Background
While the aquaculture industry in China is developed extremely rapidly, the water treatment technical level of fishery facilities in China is still low at present, breeding equipment is simple and crude, particularly, a traditional special breeding membrane is in frequent contact with water, ageing is fast, the service life is short, a scrapped membrane body causes great white pollution, and the traditional special breeding membrane is not beneficial to environment protection work, so that the oxidation resistance and ageing resistance of the existing special breeding membrane need to be improved, white pollution caused by frequent replacement is avoided, and the energy-saving and environment-friendly degree of the environment is improved.
Secondly, most of the preparation processes of the aquaculture membrane only stay in the stages of simple precipitation, filtration, air floatation and disinfection, and no measures such as efficient biochemical treatment are taken. Due to the limitation of climate, temperature and humidity of special regions of the aquaculture industry in Guangdong, the existing aquaculture film preparation process has the defects of poor air permeability, incapability of isolating high temperature and the like, and further lacks of detoxification and antibacterial treatment measures for bacterial and viral breeding caused by harmful substances such as residual baits, chemical substances, nitrogen and phosphorus-rich aquaculture biological excreta in aquaculture raw water, and the like, which is an important factor for limiting the large-scale sustainable development of the aquaculture industry in Guangdong.
Disclosure of Invention
In view of the defects of the existing aquaculture covering film preparation process, the invention aims to provide the special film for aquaculture in Guangdong area and the preparation method thereof, wherein LLDPE, LDPE and metallocene polyethylene are used as LDPE film matrixes, and the special film has excellent chemical stability and heat sealability by combining an infrared temperature control film blowing technology; the atomization of the film can be prevented by adding an anti-atomization agent, a resin modifier and the like, the film is not easy to age and has long service life, and the good antibacterial performance can be exerted by adding a trace amount of antibacterial agent; the tin-oxygen nanometer heat-insulating breathable layer is obtained by immersion, and the surface sprayed hydrophobic coating is more suitable for the climatic environment of Guangdong regions, and is high-temperature resistant, good in breathability, water-resistant and moisture-proof; combining a near-infrared film forming quality detection technology to obtain a special film with better quality for aquaculture; compared with the prior art, the special membrane for aquaculture is suitable for the fields of intensive culture mode aquaculture, industrial aquaculture, large-scale temporary pond fish culture and the like.
In order to achieve the above object, according to an aspect of the present disclosure, there is provided a special aquaculture membrane suitable for the guangdong region and a preparation method thereof, wherein the special aquaculture membrane suitable for the guangdong region is prepared from the following raw materials in parts by weight:
20-40 parts of LLDPE, 30-40 parts of LDPE, 30-35 parts of metallocene polyethylene, 2-20 parts of stannic chloride, 0.1-0.4 part of acidifier, 5 parts of polyurethane resin, 1 part of epoxy resin, 1-2 parts of antibacterial agent, 3.5 parts of anti-fogging agent, 0.3 part of dripping agent and 20.3 parts of resin modifier.
Further, the raw materials of the LLDPE, the LDPE and the metallocene polyethylene can be prepared in a weight ratio of 20: 30: 30 parts, or 30: 35: 33 parts, or 40: 40: one of 35 parts; the antibacterial agent can be one or more of tea polyphenol, phenyl salicylate, potassium sorbate, antibacterial master batch, zinc oxide, copper oxide, ammonium dihydrogen phosphate, lithium carbonate and other antibacterial materials; the anti-fogging agent can be glyceryl monostearate; the drip agent may be a non-ionic surfactant; the resin modifier can be prepared from 1.2 parts of fatty acid amide, 5 parts of light stabilizer, 10 parts of PE (polyethylene) anti-aging agent, 3 parts of hydrotalcite, 0.1 part of antioxidant and 1 part of polyphthalamide.
The preparation method of the special aquaculture membrane suitable for the Guangdong area comprises the following steps:
s100, mixing tin tetrachloride and an acidifier according to a weight ratio of 20: 1 preparing to obtain a tin oxide mixed solution; the polyurethane resin and the epoxy resin are prepared according to the weight ratio of 5: 1 preparing a hydrophobic coating material;
s200, adding LLDPE, LDPE and metallocene polyethylene into a stirrer according to the weight part ratio of raw material preparation, adding an antibacterial agent, an anti-fogging agent, a dripping agent and a resin modifier, and fully and uniformly stirring to obtain a special film material;
s300, putting the special film material into a multilayer co-extrusion film blowing machine for extrusion treatment to obtain a blow molding molten material;
s400, carrying out film blowing treatment on the blown molten material by the multilayer co-extrusion film blowing machine, wherein the blow-up ratio is set within the range of 2.5-3.0, and obtaining a film-blown bubble material;
s500, cooling the film-blowing bubble material by the multilayer co-extrusion film blowing machine, configuring an industrial infrared thermometer at the top, and synchronously detecting the cooling division Line position Line and the blown bubble position Flux of the film-blowing bubble material;
s600, carrying out traction film forming treatment on the film blowing bubble material by the multilayer co-extrusion film blowing machine, wherein the traction ratio is controlled within the range of 5.0-5.5, and obtaining the LDPE antibacterial film; and judging the performance state Status of the LDPE antibacterial film according to the cooling division Line position Line and the blown bubble position Flux: if Status is flow, the flow state is determined, and the process skips to step S700; if Status is elastic, the process goes to step S800;
s700, adjusting the performance parameters of the multilayer co-extrusion film blowing machine, improving the elastic performance of the LDPE antibacterial film, and skipping to the step S200;
s800, immersing the LDPE antibacterial film into the tin oxide mixed solution obtained in the step S100, keeping the immersion temperature at 40-80 ℃ for continuously immersing for 6 hours, taking out the LDPE antibacterial film from the immersion solution, and washing to obtain a tin-oxygen nano LDPE antibacterial film;
s900, configuring a near-infrared spectrometer at the top of the multilayer co-extrusion film blowing machine, and synchronously detecting the coverage rate P of a tin-oxygen nano heat-insulation breathable layer formed on the surface of the tin-oxygen nano LDPE antibacterial filmCover: judging whether the coverage rate of the tin-oxygen nanometer heat-insulating breathable layer is lower than a standard coverage threshold value, if so, skipping to the step S100, and correspondingly increasing the continuous immersion time in the step S800 by 1 hour; otherwise, jumping to the step S1000;
s1000, spraying the tin-oxygen nano LDPE antibacterial film with the hydrophobic coating material obtained in the step S100, drying, and then coiling the finished product to obtain the finished product of the special aquaculture film suitable for Guangdong.
When the cooling dividing line in the step S500 is blown film cooling treatment, a high-temperature blown film bubble is in contact with cooling air, the heat of the bubble can be taken away by the cooling air, the surface temperature of the bubble can be obviously reduced to be lower than the viscous flow temperature of LDPE (low-density polyethylene), so that the bubble is cooled, solidified and is not mixed, and therefore a transparent and mixed boundary limit on the blown film bubble is the cooling dividing line; the height of the film bubble is compared with the height of the film bubble after the film bubble is blown, so that the film function is certainly influenced, the surface temperature of the blown film bubble is measured by arranging an industrial infrared thermometer, and the cooling division line and the position of the blown film bubble are determined so as to judge the film function.
Preferably, the multilayer co-extrusion film blowing machine can adopt a novel high-efficiency low-energy-consumption extrusion unit, an IBC film bubble internal cooling system, a +/-360-degree horizontal type upper traction rotating system and a photoelectric automatic deviation correcting device, and has advanced functions of full-automatic winding and film tension control, an upper computer screen automatic control system and the like; the method has the advantages of higher yield, good product plasticization, low energy consumption and simple and convenient operation, and can thoroughly solve the problems of film lotus leaf edges, large and small winding heads and the like, so that the finished product has higher quality.
Further, in S300, when the multi-layer co-extrusion film blowing machine carries out extrusion processing, the temperature of the machine tail is set to be 160-170 ℃, the temperature of the machine body is set to be 165-205 ℃, the temperature of the machine head is 170-175 ℃, and the temperature of the machine head is kept uniform.
Preferably, the multilayer co-extrusion film blowing machine is used for extrusion treatment, whether each heating part is normal and whether a voltage ammeter pointer is normal should be checked in the process of heating for 3 to 4 hours, and forced startup is strictly prohibited when heating is not performed (if heating is not performed, mold dislocation and uneven film thickness are caused); after the equipment is started, the host computer is started at the speed of 15-20 rpm, and the conditions of the plasticizing condition of the special film material, the normal pressure and current of the host computer and the like need to be observed at any time.
Further, in S500, the multilayer co-extrusion film blowing machine cools the blown film bubble material, an industrial infrared thermometer is configured at the top, the Line of the cooling cut Line of the blown film bubble is synchronously detected, and the Flux of the blown film bubble is detected by the following method:
s501, fixing an industrial infrared thermometer on the top of the multilayer co-extrusion film blowing machine, monitoring a film blowing area extruded by a machine head of the multilayer co-extrusion film blowing machine in real time, and synchronously detecting the surface temperature of a film blowing bubble material to obtain a film blowing bubble thermal image;
setting the size of a pixel area of the blown film bubble thermal image as X multiplied by Y, and setting a retrieval sub-pixel coordinate as XS,yS]Wherein x isS∈[0,X]，yS∈[0,Y](ii) a Setting the cooling split Line position Line [ i, (x)S,yS)]Wherein the initial value i is 1, and the initial position of the cooling division Line is Line [1, (0,0)](ii) a Setting the blown bubble position Flux [ j ] (x)F,yF)]The jth blown bubble pixel point of (a), wherein the initial value j is 1, and the initial position of the blown bubble is Flux [1, (0,0)](ii) a Calculating the coordinate [ x ] of the edge segmentation starting point of the thermal image of the blown film bubbleB,0]The initial coordinate of the searcher is [ x ]S,yS]＝[xB,0]，Line[i,(xS,yS)]Denotes the ith coordinate as (x)S,yS) All the pixels form a curve, Flux [ j, (x)F,yF)]Denotes the jth coordinate as (x)F,yF) All the pixel points form a curve;
s502, using the said detector [ x ]S,yS]As a starting point, as the cooling split Line position Line [ i, (x)S,yS)]The ith partition line pixel point of (1); calculating a cooling gradient G (x) of the current position of the searcherS,yS) Determining a retrieval direction range;
s503, determining a fan-shaped window with the radius of r ═ p according to the search direction range, and determining the cooling gradient G (x) according to the cooling gradientS,yS) Determining whether there is a window in the sector of [ x ]S,yS]The next position of the division Line as the starting point is Line [ i +1 (x)S′,yS′)](ii) a If yes, jumping to step S505, if the presence flag Next is 1; otherwise, the flag Next is 0, and step S504 is skipped, where ρ is a set threshold constant;
s504, judging whether the radius r of the fan-shaped window is larger than or equal to the radius threshold value deltathIf yes, go to step S506; otherwise the radius of the extended sector window is r ═ ρ + Δ δ, where Δ δ is at a radius threshold δthThe unit length (for example, the unit length is 1 cm) in the step S503;
s505, the current searcher is [ x ]S,yS]Then, the blown bubble position Flux and the next search sub-coordinate are updated by steps S5051 to S5052:
s5051, judging the cooling gradient G (x) of the current searcherS,yS) If the Flow is less than the inflation melting threshold value Flow, if so, increasing the value of j by 1, and updating the position Flux [ j (x) of the inflation bubbleF,yF)]Wherein [ x ]F,yF]＝[xS,yS](ii) a Otherwise, jumping to step S5052; (ii) a
S5052, taking the next division Line position Line [ i +1 (x) in the fan-shaped windowS′,yS′)]Pixel point coordinate [ x ]S′,yS′]Set as the starting point of the next detector, i.e. update the coordinates of the starting point to [ x ]S,yS]＝[xS′,yS′]Increasing the value of i by 1, and jumping to step S502;
s506, when the radius is r ═ deltathAfter the position of the cooling division line in the fan-shaped window is searched, marking the pixel point coordinate of the searched division line as Done, and judging the current search sub-coordinate [ x [ ]S,yS]Whether x is satisfiedSX or ySIf yes, go to step S507; otherwise the blown bubble position Flux and the next search sub-coordinates are updated by steps S5061 to S5063:
s5061, jumping to S5051, and calculating to return to obtain updated location Flux [ j of blown bubble, (x)F,yF)]；
S5062, taking the sum of the sector windowThe initial point Line [1, (x) of the cooling split LineB,0)]Furthest dividing line pixel point coordinate [ x ]E,yE]As the current searcher [ x ]S,yS]The end point of (1); wherein the distance is calculated by the formula
Figure BDA0003383453490000051
S5063, in the pixel point range not marked as Done, finding the distance [ x ]E,yE]Nearest pixel xEmin,yEmin]As the starting point of the next detector, i.e. [ x ]S,yS]＝[xEmin,yEmin]Increasing the value of i by 1, and jumping to step S502;
s507, judging whether the pixel point number i of the division Line and the pixel point number j of the blown film bubble are both smaller than an effective retrieval threshold value Length in the pixel area size [ X, Y ] of the thermal image of the blown film bubble, and if so, obtaining a cooling division Line position Line and a blown film bubble position Flux of the blown film bubble; otherwise, sending an error reporting instruction to the multilayer co-extrusion film blowing machine to prompt that the position of the cooling division line or the position of the blown film bubble cannot be confirmed;
wherein, in step S501, the edge segmentation start point coordinate [ x ] of the thermal image of the blown film bubble is calculatedB,0]The method comprises the following steps:
s5011, setting the coordinate point on the edge line of the lower left corner of the blown film bubble thermal image as [ x0,0],x0∈[X,0]Wherein [0,0 ] is in the lower left corner of the blown film bubble thermal image]Is the origin of the starting point;
s5012, calculating a coordinate point [ x ] on the current lower left corner edge line according to the steps S5021 to S50220,0]Cooling gradient G (x)00), G (x) is judged00) whether the temperature is greater than or equal to the dividing line cooling threshold Boundary, if so, jumping to the step S5013; otherwise let x0Adding 1 to the value, and jumping to the step S5012;
s5013, determining x0If the value is less than or equal to the X value, determining the edge segmentation starting point coordinate of the edge segmentation starting point coordinate to be XB,0]＝[x0,0](ii) a Otherwise, sending error reporting indicator to the multilayer co-extrusion film blowing machineSo as to prompt that the position of the cooling division line cannot be confirmed;
in step S502, the method for determining the search direction range by calculating the cooling gradient of the current position of the search unit includes:
s5021, the current searcher [ x ]S,yS]Taking the temperature value C (x) of the current pixel point and the adjacent pixel point as a starting pointS,yS)、C(xS+1,yS)、C(xS,yS+1) and C (x)S+1,yS+1), calculating the horizontal temperature difference gradient g of the detectorxAnd vertical temperature gradient gy(ii) a Wherein,
Figure BDA0003383453490000052
Figure BDA0003383453490000053
wherein, C (x)S,yS) Representing coordinates (x)S,yS) The temperature value of the pixel point;
s5022, according to the horizontal temperature difference gradient gxAnd vertical temperature gradient gyCalculating and retrieving Angle of parallel line as
Figure BDA0003383453490000061
And the cooling gradient of the current searcher is
Figure BDA0003383453490000062
Wherein, gx(xS,yS) Representing coordinates (x)S,yS) Horizontal temperature difference gradient g of pixel pointx；
Wherein, gy(xS,yS) Representing coordinates (x)S,yS) Vertical temperature gradient g of pixel pointy
S5023, dividing reference intervals according to the Angle of the retrieval parallel line, namely dividing the reference intervals I and dividing the reference intervals II; taking the Angle of the retrieval parallel line as an X-axis baseline of the division reference interval I, and dividing the X-axis baseline of the division reference interval II and the X-axis baseline of the division reference interval I into 8 Angle limit subsets respectively, wherein the difference between the X-axis baseline of the division reference interval II and the X-axis baseline of the division reference interval I is 22.5 degrees; the boundary line of each angle limit subset for dividing the reference interval I corresponds to the center line of each angle limit subset for dividing the reference interval II, and each angle limit subset is a 45-degree sector area;
s5024, referring to the division reference interval I and the division reference interval II, and limiting the search direction range of the current searcher to be in the sector areas of two 45-degree Angle limit subsets in the division reference interval I and the division reference interval II according to the search parallel line Angle;
s5025, judging the coordinate [ x ] of the current searcherS,yS]Whether x is satisfiedSX or ySIf the boundary condition is Y, the search direction range is further limited to a sector area of a 45 ° angle limit subset, and the search directions are determined to be perpendicular to the boundary line and the central line of the angle limit subset area respectively; otherwise, determining the search direction range as a sector area of 45 degrees between the central lines of two angle limit subsets in the division reference interval I and the division reference interval II.
In step S503, according to the cooling gradient G (x)S,yS) Determining whether there is a window in the sector of [ x ]S,yS]The next position of the division Line as the starting point is Line [ i +1 (x)S′,yS′)]The method comprises the following steps:
s5031, using the said detector [ x ]S,yS]As a starting point, setting the traversal pixel point within the fanned window fanned range as [ xin,yin]Wherein [ x ]in,yin]＝[xS+m,yS+n]，m,n∈[0,r]The initial value m is 1, n is 0, and the presence flag Next is 0;
s5032, jumping to the step S5021 and S5022 to calculate and return to obtain the cooling gradient G (x) of the traversal pixel pointin,yin)；
S5033, judging that the fan-shaped window is insideThe condition of whether the next scribe line position exists is: temperature gradient G (x)in,yin)＝G(xS,yS) (ii) a If yes, the existence mark Next is made to be 1, and the Next parting line position [ x ] is returned after finishing the operationS′,yS′]＝[xin,yin](ii) a Taking the position of the next dividing line which is judged to exist in the first appearance as a mark point, determining the coordinate position of the mark point as the position of the next dividing line, and jumping to the step S505; otherwise, jumping to step S5034;
s5034, judging whether { m } is satisfied<r∩[xin,yin]E, a condition of being farned is met, if yes, the value of m is increased by 1, and the traversal position [ x ] is updatedin,yin]＝[xS+m,yS+n]Skipping to step S5032; otherwise, jumping to step S5035;
s5035, judging whether { n is satisfied<r∩[xin,yin]E, a condition of fanned, if n is increased by 1, m is made equal to 0, and a traversal position [ x ] is updatedin,yin]＝[xS+m,yS+n]Skipping to step S5032; otherwise let the presence flag Next equal to 0.
Further, in S600, the method for judging the performance state Status of the LDPE antibacterial film according to the cooling division Line position Line and the blown bubble position Flux includes:
s601, traversing the cooling division Line position Line [ i, (x)S,yS)]And the location of the blown bubble Flux [ j ] (x)F,yF)]Judging whether the two have an intersection: if yes, taking the minimum value of the horizontal coordinate in the vertical direction in the intersection point set as xCI.e. xC＝min(xS,xF)|{Line[i,(xS,yS)]∩Flux[j,(xF,yF)]}; otherwise, calculating the horizontal coordinate of the vertical central line as
Figure BDA0003383453490000071
The mean function is an average value, the max function is a maximum value, and the min function is a minimum value;
s602, obtaining the formulaCOn a horizontal straight line of the cooling division lineCoordinate yS,CAnd the ordinate y of the position of the blown bubbleF,CAnd judging the performance state Status of the LDPE antibacterial film: if yS,C≥yF,CIf the cooling split line is higher than the blown bubble, making Status flow, that is, the flow state, and jumping to step S700; otherwise, let Status be elastic, i.e. elastic state, and go to step S800.
Further, in S700, the method for adjusting the performance parameters of the multilayer co-extrusion film blowing machine includes:
s701, when the multilayer co-extrusion film blowing machine is used for film blowing treatment, the blow-up ratio is reduced by 0.05-0.2 (the initial blow-up ratio is 2.5-3.0) every time, namely, the blow-up ratio is reduced by 0.05-0.2 every time;
s702, when the multilayer co-extrusion film blowing machine is used for cooling, the air volume of cooling air is increased by 10% so as to improve the cooling effect of a bubble cooling air ring system;
s703, when the multilayer co-extrusion film blowing machine is used for traction film forming treatment, the traction ratio (the initial traction ratio is 4-8) is reduced by 0.1-0.5 every time, namely, the traction ratio is reduced by 0.1-0.5 every time.
Further, in S900, the coverage rate P of the tin-oxygen nano heat-insulating breathable layer formed on the surface of the tin-oxygen nano LDPE antibacterial film is synchronously detectedCoverThe calculation method comprises the following steps:
s901, arranging a near-infrared spectrometer on the top of the multilayer co-extrusion film blowing machine to be fixed in parallel with the industrial infrared thermometer, synchronously detecting the surface of the tin-oxygen nano LDPE antibacterial film to obtain a tin ion absorption spectrum data image, and setting the area size of the tin ion absorption spectrum data image as [ M, N []Detecting pixel point coordinate as [ x ]tin(k),ytin(l)]Initializing xtin(0)＝0,ytin(0) 0, where k ∈ [0, M ∈ >],l∈[0,N](ii) a Wherein, [ x ]tin(k),ytin(l)]Representing the coordinates of a pixel point with the coordinate value of (k, l);
s902, traversing the light intensity value of each pixel point in the tin ion absorption spectrum data image, wherein the area size is [ M, N]The coordinates of the detection pixel points corresponding to the middle points in the areas are
Figure BDA0003383453490000081
Corresponding to the point of light intensity value of
Figure BDA0003383453490000082
Calculating the center of the coverage area of the tin-oxygen nano heat-insulating breathable layer as Cx,Cy]The central position light intensity value in the effective detection coverage area of the near-infrared spectrometer is obtained; wherein,
Figure BDA0003383453490000083
s902, according to the center of the coverage area [ C ] of the tin-oxygen nano heat-insulating and breathable layerx,Cy]Determining a coverage incidence matrix for a coverage area thereof
Figure BDA0003383453490000084
Wherein,
Figure BDA0003383453490000085
Figure BDA0003383453490000086
Figure BDA0003383453490000087
wherein,
Figure BDA0003383453490000088
representing coordinate values of
Figure BDA0003383453490000089
The coordinates of the pixel points of (1);
s903, according to the center [ C ] of the coverage areax,Cy]And the coverage incidence matrix MCoverCalculating over the whole area [ M, N]Inner postThe size of the coverage area of the tin-oxygen nanometer heat-insulating breathable layer is Cover ═ (C)x,Cy)·MCover；
S904, calculating the coverage rate of the tin-oxygen nano heat-insulating air-permeable layer according to the coverage area size Cover of the tin-oxygen nano heat-insulating air-permeable layer
Figure BDA0003383453490000091
Where s (cover) length (cover) width (cover) is the area of the coverage area.
As mentioned above, the special aquaculture membrane suitable for the Guangdong area and the preparation method thereof have the following beneficial effects: (1) the film has the advantages that the tin-oxygen nanometer heat-insulation breathable layer is arranged, the water temperature of a water area below the film can be effectively reduced, the heat insulation performance is good, the breathability is good, hot and high-temperature climate in summer in Guangdong areas can be overcome, the oxidation resistance and aging resistance of the existing special film for cultivation are improved, white pollution caused by frequent replacement is avoided, and the energy-saving and environment-friendly degree of the environment is improved; (2) the surface of the paint has a hydrophobic coating, so that the paint has strong water resistance and moisture resistance, and can overcome the humid environment of plum rain climate and typhoon storm weather in Guangdong areas; (3) the film has antibacterial performance, and the film has good antioxidant capacity by adding the antibacterial material, so that the antibacterial effect is enhanced; (4) the infrared temperature control film blowing technology and the near-infrared film forming quality detection technology with high efficiency and high precision are realized by combining infrared and near-infrared spectrum detection equipment.
Drawings
The foregoing and other features of the present disclosure will become more apparent from the detailed description of the embodiments shown in conjunction with the drawings in which like reference characters designate the same or similar elements throughout the several views, and it is apparent that the drawings in the following description are merely some examples of the present disclosure and that other drawings may be derived therefrom by those skilled in the art without the benefit of any inventive faculty, and in which:
FIG. 1 is a schematic diagram showing the construction of a special membrane for aquaculture in the Guangdong region;
FIG. 2 is a flow chart of a preparation method of a special aquaculture membrane suitable for Guangdong.
Detailed Description
The conception, specific structure and technical effects of the present disclosure will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, aspects and effects of the present disclosure. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The invention is further described with reference to the following figures and detailed description:
the embodiment of the present disclosure provides a special aquaculture membrane suitable for the area of guangdong, as shown in fig. 1, is a schematic structural diagram of a special aquaculture membrane suitable for the area of guangdong, and includes a five-layer membrane structure: the anti-fogging coating comprises a LDPE film substrate layer 01, an anti-fogging layer 02, an antibacterial layer 03, a tin-oxygen nano heat-insulating breathable layer 04 and a hydrophobic coating layer 05;
the special aquaculture membrane is prepared from the following raw materials in parts by weight:
20-40 parts of LLDPE, 30-40 parts of LDPE, 30-35 parts of metallocene polyethylene, 2-20 parts of stannic chloride, 0.1-0.4 part of acidifier, 5 parts of polyurethane resin, 1 part of epoxy resin, 1-2 parts of antibacterial agent, 3.5 parts of anti-fogging agent, 0.3 part of dripping agent and 20.3 parts of resin modifier.
Further, the raw materials of the LLDPE, the LDPE and the metallocene polyethylene can be prepared in a weight ratio of 20: 30: 30 parts, or 30: 35: 33 parts, or 40: 40: one of 35 parts; the antibacterial agent can be one or more of tea polyphenol, phenyl salicylate, potassium sorbate, antibacterial master batch, zinc oxide, copper oxide, ammonium dihydrogen phosphate, lithium carbonate and other antibacterial materials; the anti-fogging agent can be glyceryl monostearate; the drip agent may be a non-ionic surfactant; the resin modifier can be prepared from 1.2 parts of fatty acid amide, 5 parts of light stabilizer, 10 parts of PE (polyethylene) anti-aging agent, 3 parts of hydrotalcite, 0.1 part of antioxidant and 1 part of polyphthalamide.
The embodiment of the present disclosure provides a preparation method of a special aquaculture membrane suitable for the guangdong region, and as shown in fig. 2, is a flow chart of the preparation method of the special aquaculture membrane suitable for the guangdong region, and the method of the embodiment includes the following steps:
s100, mixing tin tetrachloride and an acidifier according to a weight ratio of 20: 1 preparing to obtain a tin oxide mixed solution; the polyurethane resin and the epoxy resin are prepared according to the weight ratio of 5: 1 preparing a hydrophobic coating material;
s200, adding LLDPE, LDPE and metallocene polyethylene into a stirrer according to the weight part ratio of raw material preparation, adding an antibacterial agent, an anti-fogging agent, a dripping agent and a resin modifier, and fully and uniformly stirring to obtain a special film material;
s300, putting the special film material into a multilayer co-extrusion film blowing machine for extrusion treatment to obtain a blow molding molten material;
s400, carrying out film blowing treatment on the blown molten material by the multilayer co-extrusion film blowing machine, wherein the blow-up ratio is set within the range of 2.5-3.0, and obtaining a film-blown bubble material;
s500, cooling the film-blowing bubble material by the multilayer co-extrusion film blowing machine, configuring an industrial infrared thermometer at the top, and synchronously detecting the cooling division Line position Line and the blown bubble position Flux of the film-blowing bubble material;
s600, carrying out traction film forming treatment on the film blowing bubble material by the multilayer co-extrusion film blowing machine, wherein the traction ratio is controlled within the range of 5.0-5.5, and obtaining the LDPE antibacterial film; and judging the performance state Status of the LDPE antibacterial film according to the cooling division Line position Line and the blown bubble position Flux: if Status is flow, the flow state is determined, and the process skips to step S700; if Status is elastic, the process goes to step S800;
s700, adjusting the performance parameters of the multilayer co-extrusion film blowing machine, improving the elastic performance of the LDPE antibacterial film, and skipping to the step S200;
s800, immersing the LDPE antibacterial film into the tin oxide mixed solution obtained in the step S100, keeping the immersion temperature at 40-80 ℃ for continuously immersing for 6 hours, taking out the LDPE antibacterial film from the immersion solution, and washing to obtain a tin-oxygen nano LDPE antibacterial film;
s900, configuring a near-infrared spectrometer at the top of the multilayer co-extrusion film blowing machine, and synchronously detecting the coverage rate P of a tin-oxygen nano heat-insulation breathable layer formed on the surface of the tin-oxygen nano LDPE antibacterial filmCover: judging whether the coverage rate of the tin-oxygen nanometer heat-insulating breathable layer is lower than a standard coverage threshold value, if so, skipping to the step S100, and correspondingly increasing the continuous immersion time in the step S800 by 1 hour; otherwise, jumping to the step S1000;
s1000, spraying the tin-oxygen nano LDPE antibacterial film with the hydrophobic coating material obtained in the step S100, drying, and then coiling the finished product to obtain the finished product of the special aquaculture film suitable for Guangdong.
Preferably, the multilayer co-extrusion film blowing machine can adopt a novel high-efficiency low-energy-consumption extrusion unit, an IBC film bubble internal cooling system, a +/-360-degree horizontal type upper traction rotating system and a photoelectric automatic deviation correcting device, and has advanced functions of full-automatic winding and film tension control, an upper computer screen automatic control system and the like; the method has the advantages of higher yield, good product plasticization, low energy consumption and simple and convenient operation, and can thoroughly solve the problems of film lotus leaf edges, large and small winding heads and the like, so that the finished product has higher quality.
Further, in S300, when the multi-layer co-extrusion film blowing machine carries out extrusion processing, the temperature of the machine tail is set to be 160-170 ℃, the temperature of the machine body is set to be 165-205 ℃, the temperature of the machine head is 170-175 ℃, and the temperature of the machine head is kept uniform.
Preferably, the multilayer co-extrusion film blowing machine is used for extrusion treatment, whether each heating part is normal and whether a voltage ammeter pointer is normal should be checked in the process of heating for 3 to 4 hours, and forced startup is strictly prohibited when heating is not performed (if heating is not performed, mold dislocation and uneven film thickness are caused); after the equipment is started, the host computer is started at the speed of 15-20 rpm, and the conditions of the plasticizing condition of the special film material, the normal pressure and current of the host computer and the like need to be observed at any time.
Further, in S500, the multilayer co-extrusion film blowing machine cools the blown film bubble material, an industrial infrared thermometer is configured at the top, the Line of the cooling cut Line of the blown film bubble is synchronously detected, and the Flux of the blown film bubble is detected by the following method:
s501, fixing an industrial infrared thermometer on the top of the multilayer co-extrusion film blowing machine, monitoring a film blowing area extruded by a machine head of the multilayer co-extrusion film blowing machine in real time, and synchronously detecting the surface temperature of a film blowing bubble material to obtain a film blowing bubble thermal image;
wherein the pixel area size of the blown film bubble thermal image is set as [ X, Y ]]Which retrieves the sub-pixel coordinate of [ x ]S,yS]Wherein x isS∈[0,X]，yS∈[0,Y](ii) a Setting the cooling split Line position Line [ i, (x)S,yS)]Wherein the initial value i is 1, and the initial position of the cooling division Line is Line [1, (0,0)](ii) a Setting the blown bubble position Flux [ j ] (x)F,yF)]The jth blown bubble pixel point of (a), wherein the initial value j is 1, and the initial position of the blown bubble is Flux [1, (0,0)](ii) a Calculating the coordinate [ x ] of the edge segmentation starting point of the thermal image of the blown film bubbleB,0]The initial coordinate of the searcher is [ x ]S,yS]＝[xB,0]；
S502, using the said detector [ x ]S,yS]As a starting point, as the cooling split Line position Line [ i, (x)S,yS)]The ith partition line pixel point of (1); calculating a cooling gradient G (x) of the current position of the searcherS,yS) Determining a retrieval direction range;
s503, determining a fan-shaped window with the radius of r ═ p according to the search direction range, and determining the cooling gradient G (x) according to the cooling gradientS,yS) Determining whether there is a window in the sector of [ x ]S,yS]The next position of the division Line as the starting point is Line [ i +1 (x)S′,yS′)](ii) a If yes, jumping to step S505, if the presence flag Next is 1; otherwise, that is, if the flag Next is 0, the process goes to step S504, where ρ is a set threshold constant, and is preferably set to Line [1, (0,0)]To Line [ i, (x)S,yS)]The distance value or ρ at which the distance is shortest is set to [10,40 ]]Centimeter, Line [ i +1 ] (x)S′,yS′)]Is divided into lines Line[i,(xS,yS)]The next pixel point of (x) has the coordinate ofS′,yS′)；
S504, judging whether the radius r of the fan-shaped window is larger than or equal to the radius threshold value deltathIf yes, go to step S506; otherwise the radius of the extended sector window is r ═ ρ + Δ δ, where Δ δ is at a radius threshold δthThe unit length of the inner part (generally, delta is set to be 1 cm), and the step S503 is skipped;
s505, the current searcher is [ x ]S,yS]Then, the blown bubble position Flux and the next search sub-coordinate are updated by steps S5051 to S5052:
s5051, judging the cooling gradient G (x) of the current searcherS,yS) If the Flow is less than the inflation melting threshold value Flow, if so, increasing the value of j by 1, and updating the position Flux [ j (x) of the inflation bubbleF,yF)]Wherein [ x ]F,yF]＝[xS,yS](ii) a Otherwise, jumping to step S5052;
s5052, taking the next division Line position Line [ i +1 (x) in the fan-shaped windowS′,yS′)]Pixel point coordinate [ x ]S′,yS′]Set as the starting point of the next detector, i.e. update the coordinates of the starting point to [ x ]S,yS]＝[xS′,yS′]Increasing the value of i by 1, and jumping to step S502;
s506, when the radius is r ═ deltathAfter the position of the cooling division line in the fan-shaped window is searched, marking the pixel point coordinate of the searched division line as Done, and judging the current search sub-coordinate [ x [ ]S,yS]Whether x is satisfiedSX or ySIf yes, go to step S507; otherwise the blown bubble position Flux and the next search sub-coordinates are updated by steps S5061 to S5063:
s5061, jumping to S5051, and calculating to return to obtain updated location Flux [ j of blown bubble, (x)F,yF)]；
S5062, selecting the initial point Line [1, (x) of the position of the cooling dividing Line in the fan-shaped windowB,0)]The farthest divided line imageCoordinates of a pixel point [ x ]E,yE]As the current searcher [ x ]S,yS]The end point of (1); wherein the distance is calculated by the formula
Figure BDA0003383453490000121
S5063, in the pixel point range not marked as Done, finding the distance [ x ]E,yE]Nearest pixel xEmin,yEmin]As the starting point of the next detector, i.e. [ x ]S,yS]＝[xEmin,yEmin]Increasing the value of i by 1, and jumping to step S502;
s507, judging whether the pixel point number i of the division Line and the pixel point number j of the blown film bubble are both smaller than an effective retrieval threshold value Length in the pixel area size [ X, Y ] of the thermal image of the blown film bubble, and if so, obtaining a cooling division Line position Line and a blown film bubble position Flux of the blown film bubble; otherwise, sending an error reporting instruction to the multilayer co-extrusion film blowing machine to prompt that the position of the cooling division line or the position of the blown film bubble cannot be confirmed;
wherein, in step S501, the edge segmentation start point coordinate [ x ] of the thermal image of the blown film bubble is calculatedB,0]The method comprises the following steps:
s5011, setting the coordinate point on the edge line of the lower left corner of the blown film bubble thermal image as [ x0,0],x0∈[X,0]Wherein [0,0 ] is in the lower left corner of the blown film bubble thermal image]Is the origin of the starting point;
s5012, calculating a coordinate point [ x ] on the current lower left corner edge line according to the steps S5021 to S50220,0]Cooling gradient G (x)00), G (x) is judged00) whether the temperature is greater than or equal to the dividing line cooling threshold Boundary, if so, jumping to the step S5013; otherwise let x0Adding 1 to the value, and jumping to the step S5012;
s5013, determining x0If the value is less than or equal to the X value, determining the edge segmentation starting point coordinate of the edge segmentation starting point coordinate to be XB,0]＝[x0,0](ii) a Otherwise, sending an error reporting instruction to the multilayer co-extrusion film blowing machine to prompt that the position of the cooling division line cannot be confirmed;
in step S502, the method for determining the search direction range by calculating the cooling gradient of the current position of the search unit includes:
s5021, the current searcher [ x ]S,yS]Taking the temperature value C (x) of the current pixel point and the adjacent pixel point as a starting pointS,yS)、C(xS+1,yS)、C(xS,yS+1) and C (x)S+1,yS+1), calculating the horizontal temperature difference gradient g of the detectorxAnd vertical temperature gradient gy(ii) a Wherein,
Figure BDA0003383453490000131
Figure BDA0003383453490000132
s5022, according to the horizontal temperature difference gradient gxAnd vertical temperature gradient gyCalculating and retrieving Angle of parallel line as
Figure BDA0003383453490000133
And the cooling gradient of the current searcher is
Figure BDA0003383453490000134
S5023, determining two 360-degree division reference intervals which are called a division reference interval I and a division reference interval II according to the Angle of the parallel line; taking the Angle of the retrieval parallel line as an X-axis baseline of the division reference interval I, and dividing the X-axis baseline of the division reference interval II and the X-axis baseline of the division reference interval I into 8 Angle limit subsets respectively, wherein the difference between the X-axis baseline of the division reference interval II and the X-axis baseline of the division reference interval I is 22.5 degrees; the boundary line of each angle limit subset for dividing the reference interval I corresponds to the center line of each angle limit subset for dividing the reference interval II, and each angle limit subset is a 45-degree sector area;
s5024, referring to the division reference interval I and the division reference interval II, and limiting the search direction range of the current searcher to be in the sector areas of two 45-degree Angle limit subsets in the division reference interval I and the division reference interval II according to the search parallel line Angle;
s5025, judging the coordinate [ x ] of the current searcherS,yS]Whether x is satisfiedSX or ySIf the boundary condition is Y, the search direction range is further limited to a sector area of a 45 ° angle limit subset, and the search directions are determined to be perpendicular to the boundary line and the central line of the angle limit subset area respectively; otherwise, determining the search direction range as a sector area of 45 degrees between the central lines of two angle limit subsets in the division reference interval I and the division reference interval II.
In step S503, according to the cooling gradient G (x)S,yS) Determining whether there is a window in the sector of [ x ]S,yS]The next position of the division Line as the starting point is Line [ i +1 (x)S′,yS′)]The method comprises the following steps:
s5031, using the said detector [ x ]S,yS]As a starting point, setting the traversal pixel point within the fanned window fanned range as [ xin,yin]Wherein [ x ]in,yin]＝[xS+m,yS+n]，m,n∈[0,r]The initial value m is 1, n is 0, and the presence flag Next is 0;
s5032, jumping to the step S5021 and S5022 to calculate and return to obtain the cooling gradient G (x) of the traversal pixel pointin,yin)；
S5033, determining whether there is a next segment line position in the sector window is: temperature gradient G (x)in,yin)＝G(xS,yS) (ii) a If yes, the existence mark Next is made to be 1, and the Next parting line position [ x ] is returned after finishing the operationS′,yS′]＝[xin,yin](ii) a Taking the position of the next dividing line which is judged to exist in the first appearance as a mark point, determining the coordinate position of the mark point as the position of the next dividing line, and jumping to the step S505; otherwise, jumping to step S5034;
s5034, judging whether { m } is satisfied<r∩[xin,yin]E, a condition of being farned is met, if yes, the value of m is increased by 1, and the traversal position [ x ] is updatedin,yin]＝[xS+m,yS+n]Skipping to step S5032; otherwise, jumping to step S5035;
s5035, judging whether { n is satisfied<r∩[xin,yin]E, a condition of fanned, if n is increased by 1, m is made equal to 0, and a traversal position [ x ] is updatedin,yin]＝[xS+m,yS+n]Skipping to step S5032; otherwise let the presence flag Next equal to 0.
Further, in S600, the method for judging the performance state Status of the LDPE antibacterial film according to the cooling division Line position Line and the blown bubble position Flux includes:
s601, traversing the cooling division Line position Line [ i, (x)S,yS)]And the location of the blown bubble Flux [ j ] (x)F,yF)]Judging whether the two have an intersection: if yes, taking the minimum value of the horizontal coordinate in the vertical direction in the intersection point set as xCI.e. xC＝min(xS,xF)|{Line[i,(xS,yS)]∩Flux[j,(xF,yF)]}; otherwise, calculating the horizontal coordinate of the vertical central line as
Figure BDA0003383453490000151
The mean function is an average value, the max function is a maximum value, and the min function is a minimum value;
s602, obtaining the formulaCOn a horizontal straight line of the cooling division line positionS,CAnd the ordinate y of the position of the blown bubbleF,CAnd judging the performance state Status of the LDPE antibacterial film: if yS,C≥yF,CIf the cooling split line is higher than the blown bubble, making Status flow, that is, the flow state, and jumping to step S700; otherwise, let Status be elastic, i.e. elastic state, and go to step S800.
Further, in S700, the method for adjusting the performance parameters of the multilayer co-extrusion film blowing machine includes:
s701, when the multilayer co-extrusion film blowing machine is used for film blowing treatment, the blow-up ratio is reduced by 0.05-0.2 (the initial blow-up ratio is 2.5-3.0) every time, namely, the blow-up ratio is reduced by 0.05-0.2 every time;
s702, when the multilayer co-extrusion film blowing machine is used for cooling, the air volume of cooling air is increased by 10% so as to improve the cooling effect of a bubble cooling air ring system;
s703, when the multilayer co-extrusion film blowing machine is used for traction film forming treatment, the traction ratio (the initial traction ratio is 4-8) is reduced by 0.1-0.5 every time, namely, the traction ratio is reduced by 0.1-0.5 every time.
Further, in S900, the coverage rate P of the tin-oxygen nano heat-insulating breathable layer formed on the surface of the tin-oxygen nano LDPE antibacterial film is synchronously detectedCoverThe calculation method comprises the following steps:
s901, arranging a near-infrared spectrometer on the top of the multilayer co-extrusion film blowing machine to be fixed in parallel with the industrial infrared thermometer, synchronously detecting the surface of the tin-oxygen nano LDPE antibacterial film to obtain a tin ion absorption spectrum data image, and setting the area size of the tin ion absorption spectrum data image as [ M, N []Detecting pixel point coordinate as [ x ]tin(k),ytin(l)]Initializing xtin(0)＝0,ytin(0) 0, where k ∈ [0, M ∈ >],l∈[0,N]；，
S902, traversing the light intensity value of each pixel point in the tin ion absorption spectrum data image, wherein the area size is [ M, N]The coordinates of the detection pixel points corresponding to the middle points in the areas are
Figure BDA0003383453490000161
Corresponding to the point of light intensity value of
Figure BDA0003383453490000162
Calculating the center of the coverage area of the tin-oxygen nano heat-insulating breathable layer as Cx,Cy]The central position light intensity value in the effective detection coverage area of the near-infrared spectrometer is obtained; wherein,
Figure BDA0003383453490000163
s902, according to the center of the coverage area [ C ] of the tin-oxygen nano heat-insulating and breathable layerx,Cy]Determining a coverage incidence matrix for a coverage area thereof
Figure BDA0003383453490000164
Wherein,
Figure BDA0003383453490000165
Figure BDA0003383453490000166
Figure BDA0003383453490000167
s903, according to the center [ C ] of the coverage areax,Cy]And the coverage incidence matrix MCoverCalculating over the whole area [ M, N]The covering area of the tin-oxygen nano heat-insulating breathable layer in the inner layer is Cover ═ (C)x,Cy)·MCover；
S904, calculating the coverage rate of the tin-oxygen nano heat-insulating air-permeable layer according to the coverage area size Cover of the tin-oxygen nano heat-insulating air-permeable layer
Figure BDA0003383453490000168
Where s (cover) length (cover) width (cover) is the area of the coverage area.
The foregoing description of the preferred embodiments of the present disclosure is provided merely to aid in the explanation of the invention. Although the present disclosure has been described in considerable detail and with reference to certain preferred versions thereof, it is not intended to be limited to any such details or versions or any particular embodiment so as to effectively encompass the intended scope of the present disclosure. Furthermore, the foregoing describes the disclosure in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the disclosure, not presently foreseen, may nonetheless represent equivalent modifications thereto.

Claims (7)

1. The special aquaculture membrane suitable for Guangdong areas is characterized by being prepared from the following raw materials in parts by weight:
20-40 parts of LLDPE, 30-40 parts of LDPE, 30-35 parts of metallocene polyethylene, 2-20 parts of stannic chloride, 0.1-0.4 part of acidifier, 5 parts of polyurethane resin, 1 part of epoxy resin, 1-2 parts of antibacterial agent, 3.5 parts of anti-fogging agent, 0.3 part of dripping agent and 20.3 parts of resin modifier;
the preparation method of the special aquaculture membrane suitable for the Guangdong area comprises the following steps:
s100, mixing tin tetrachloride and an acidifier according to a weight ratio of 20: 1 preparing to obtain a tin oxide mixed solution; the polyurethane resin and the epoxy resin are prepared according to the weight ratio of 5: 1 preparing a hydrophobic coating material;
s200, adding LLDPE, LDPE and metallocene polyethylene into a stirrer according to the weight part ratio of raw material preparation, adding an antibacterial agent, an anti-fogging agent, a dripping agent and a resin modifier, and fully and uniformly stirring to obtain a special film material;
s300, putting the special film material into a multilayer co-extrusion film blowing machine for extrusion treatment to obtain a blow molding molten material;
s400, carrying out film blowing treatment on the blown molten material by the multilayer co-extrusion film blowing machine, wherein the blow-up ratio is set within the range of 2.5-3.0, and obtaining a film-blown bubble material;
s500, cooling the film-blowing bubble material by the multilayer co-extrusion film blowing machine, configuring an industrial infrared thermometer at the top, and synchronously detecting the cooling division Line position Line and the blown bubble position Flux of the film-blowing bubble material;
s600, carrying out traction film forming treatment on the film blowing bubble material by the multilayer co-extrusion film blowing machine, wherein the traction ratio is controlled within the range of 5.0-5.5, and obtaining the LDPE antibacterial film; and judging the performance state Status of the LDPE antibacterial film according to the cooling division Line position Line and the blown bubble position Flux: if Status is flow, the flow state is determined, and the process skips to step S700; if Status is elastic, the process goes to step S800;
s700, adjusting the performance parameters of the multilayer co-extrusion film blowing machine, improving the elastic performance of the LDPE antibacterial film, and skipping to the step S200;
s800, immersing the LDPE antibacterial film into the tin oxide mixed solution obtained in the step S100, keeping the immersion temperature at 40-80 ℃ for continuously immersing for 6 hours, taking out the LDPE antibacterial film from the immersion solution, and washing to obtain a tin-oxygen nano LDPE antibacterial film;
s900, configuring a near-infrared spectrometer at the top of the multilayer co-extrusion film blowing machine, and synchronously detecting the coverage rate P of a tin-oxygen nano heat-insulation breathable layer formed on the surface of the tin-oxygen nano LDPE antibacterial filmCover: judging whether the coverage rate of the tin-oxygen nanometer heat-insulating breathable layer is lower than a standard coverage threshold value, if so, increasing the continuous immersion time in the step S800 by 1 hour and skipping to the step S100; otherwise, jumping to the step S1000;
s1000, spraying the hydrophobic coating material in the step S100 on the tin-oxygen nano LDPE antibacterial film, drying, and then coiling a finished product to obtain the finished product of the special film for aquaculture in Guangdong.
2. The special film for aquaculture in the Guangdong area of claim 1, wherein the raw materials of LLDPE, LDPE and metallocene polyethylene are prepared in a weight ratio of 20: 30: 30 parts, or 30: 35: 33 parts, or 40: 40: one of 35 parts; the antibacterial agent can be one or more of tea polyphenol, phenyl salicylate, potassium sorbate, antibacterial master batch, zinc oxide, copper oxide, ammonium dihydrogen phosphate, lithium carbonate and other antibacterial materials; the anti-fogging agent can be glyceryl monostearate; the drip agent may be a non-ionic surfactant; the resin modifier can be prepared from 1.2 parts of fatty acid amide, 5 parts of light stabilizer, 10 parts of PE (polyethylene) anti-aging agent, 3 parts of hydrotalcite, 0.1 part of antioxidant and 1 part of polyphthalamide.
3. The preparation method of the special film for aquaculture in Guangdong area according to claim 1, wherein in S300, when the multilayer co-extrusion film blowing machine is used for extrusion treatment, the temperature of the tail is set to be 160-170 ℃, the temperature of the machine body is set to be 165-205 ℃, the temperature of the head is set to be 170-175 ℃, and the temperature of the head is kept uniform.
4. The method according to claim 1, wherein in S500, the multilayer co-extrusion film blowing machine cools the blown film bubble material, an industrial infrared thermometer is disposed at the top, the cooling cut Line position Line of the blown film bubble is synchronously detected, and the detection method of the blown film bubble position Flux is as follows:
s501, fixing an industrial infrared thermometer on the top of the multilayer co-extrusion film blowing machine, monitoring a film blowing area extruded by a machine head of the multilayer co-extrusion film blowing machine in real time, and synchronously detecting the surface temperature of a film blowing bubble material to obtain a film blowing bubble thermal image;
wherein the pixel area size of the blown film bubble thermal image is set as [ X, Y ]]Setting the search sub-pixel coordinate to [ x ]S,yS]Wherein x isS∈[0,X]，yS∈[0,Y](ii) a Setting the cooling split Line position Line [ i, (x)S,yS)]Wherein the initial value i is 1, and the initial position of the cooling division Line is Line [1, (0,0)](ii) a Setting the blown bubble position Flux [ j ] (x)F,yF)]The jth blown bubble pixel point of (a), wherein the initial value of j is set to be 1, and the initial position of the blown bubble is Flux [1, (0,0)](ii) a Calculating the coordinate [ x ] of the edge segmentation starting point of the thermal image of the blown film bubbleB,0]The initial coordinate of the searcher is [ x ]S,yS]＝[xB,0]；
S502, using the said detector [ x ]S,yS]As a starting point, as the cooling split Line position Line [ i, (x)S,yS)]The ith partition line pixel point of (1); calculating a cooling gradient G (x) of the current position of the searcherS,yS) Determining a retrieval direction range;
s503, according to the aboveDetermining a fan-shaped window with the radius of r ═ rho according to the search direction range, and determining the fan-shaped window according to the cooling gradient G (x)S,yS) Determining whether there is a window in the sector of [ x ]S,yS]The next position of the division Line as the starting point is Line [ i +1 (x)S′,yS′)](ii) a If yes, jumping to step S505, if the presence flag Next is 1; otherwise, the flag Next is 0, and step S504 is skipped, where ρ is a set threshold constant;
s504, judging whether the radius r of the fan-shaped window is larger than or equal to the radius threshold value deltathIf yes, go to step S506; otherwise the radius of the extended sector window is r ═ ρ + Δ δ, where Δ δ is at a radius threshold δthSkipping to step S503 for the unit length of the inner part;
s505, the current searcher is [ x ]S,yS]Then, the blown bubble position Flux and the next search sub-coordinate are updated by steps S5051 to S5052:
s5051, judging the cooling gradient G (x) of the current searcherS,yS) If the Flow is less than the inflation melting threshold value Flow, if so, increasing the value of j by 1, and updating the position Flux [ j (x) of the inflation bubbleF,yF)]Wherein [ x ]F,yF]＝[xS,yS](ii) a Otherwise, jumping to step S5052;
s5052, taking the next division Line position Line [ i +1 (x) in the fan-shaped windowS′,yS′)]Pixel point coordinate [ x ]S′,yS′]Set as the starting point of the next detector, i.e. update the coordinates of the starting point to [ x ]S,yS]＝[xS′,yS′]Increasing the value of i by 1, and jumping to step S502;
s506, when the radius is r ═ deltathAfter the position of the cooling division line in the fan-shaped window is searched, marking the pixel point coordinate of the searched division line as Done, and judging the current search sub-coordinate [ x [ ]S,yS]Whether x is satisfiedSX or ySIf yes, go to step S507; otherwise the blown bubble position Flux and the next search sub-coordinates are updated by steps S5061 to S5063:
s5061, jumping to S5051, and calculating to return to obtain updated location Flux [ j of blown bubble, (x)F,yF)]；
S5062, selecting the initial point Line [1, (x) of the position of the cooling dividing Line in the fan-shaped windowB,0)]Furthest dividing line pixel point coordinate [ x ]E,yE]As the current searcher [ x ]S,yS]The end point of (1);
s5063, in the pixel point range not marked as Done, finding the distance [ x ]E,yE]Nearest pixel xEmin,yEmin]Update as the starting point of the next detector, i.e. [ x ]S,yS]＝[xEmin,yEmin]Increasing the value of i by 1, and jumping to step S502;
s507, judging whether the pixel point number i of the division Line and the pixel point number j of the blown film bubble are both smaller than an effective retrieval threshold value Length within the size of the pixel area X multiplied by Y of the thermal image of the blown film bubble, and if so, obtaining a cooling division Line position Line and a blown film bubble position Flux of the blown film bubble; otherwise, sending an error reporting instruction to the multilayer co-extrusion film blowing machine to prompt that the position of the cooling division line or the position of the blown film bubble cannot be confirmed;
wherein, in step S501, the edge segmentation start point coordinate [ x ] of the thermal image of the blown film bubble is calculatedB,0]The method comprises the following steps:
s5011, setting the coordinate point on the edge line of the lower left corner of the blown film bubble thermal image as [ x0,0],x0∈[X,0]Wherein [0,0 ] is in the lower left corner of the blown film bubble thermal image]Is the origin of the starting point;
s5012, calculating a coordinate point [ x ] on the current lower left corner edge line according to the steps S5021 to S50220,0]Cooling gradient G (x)00), G (x) is judged00) whether the temperature is greater than or equal to the dividing line cooling threshold Boundary, if so, jumping to the step S5013; otherwise let x0Adding 1 to the value, and jumping to the step S5012;
s5013, determining x0If the value is less than or equal to the X value, determining the edge segmentation starting point coordinate of the edge segmentation starting point coordinate to be XB,0]＝[x0,0](ii) a Or else co-extruding the multilayerAnd the film blowing machine sends an error reporting instruction to prompt that the position of the cooling dividing line cannot be confirmed.
5. The method for preparing a special membrane for aquaculture in the Guangdong area according to claim 4, wherein in step S503, the temperature gradient G (x) is decreased according to the above formulaS,yS) Determining whether there is a window in the sector of [ x ]S,yS]The next position of the division Line as the starting point is Line [ i +1 (x)S′,yS′)]The method comprises the following steps:
s5031, using the said detector [ x ]S,yS]As a starting point, setting the traversal pixel point in the fan-shaped window range fanned as [ x ]in,yin]Wherein [ x ]in,yin]＝[xS+m,yS+n]，m,n∈[0,r]The initial value m is 1, n is 0, and the presence flag Next is 0;
s5032, jumping to the step S5021 and S5022 to calculate and return to obtain the cooling gradient G (x) of the traversal pixel pointin,yin)；
S5033, determining whether there is a next segment line position in the sector window is: temperature gradient G (x)in,yin)＝G(xS,yS) (ii) a If yes, the existence mark Next is made to be 1, and the Next parting line position [ x ] is returned after finishing the operationS′,yS′]＝[xin,yin](ii) a Taking the position of the next dividing line which is judged to exist in the first appearance as a mark point, determining the coordinate position of the mark point as the position of the next dividing line, and jumping to the step S505; otherwise, jumping to step S5034;
s5034, judging whether { m } is satisfied<r∩[xin,yin]E, a condition of being farned is met, if yes, the value of m is increased by 1, and the traversal position [ x ] is updatedin,yin]＝[xS+m,yS+n]Skipping to step S5032; otherwise, jumping to step S5035;
s5035, judging whether { n is satisfied<r∩[xin,yin]E, a condition of fanned, if n is increased by 1, m is made equal to 0, and a traversal position [ x ] is updatedin,yin]＝[xS+m,yS+n]Skipping to step S5032; otherwise let the presence flag Next equal to 0.
6. The method for preparing the special film for aquaculture in Guangdong area according to claim 1, wherein in S600, the method for judging the performance state Status of the LDPE antibacterial film according to the cooling division Line position Line and the blown bubble position Flux comprises the following steps:
s601, traversing the cooling division Line position Line [ i, (x)S,yS)]And the location of the blown bubble Flux [ j ] (x)F,yF)]Judging whether the two have an intersection: if yes, taking the minimum value of the horizontal coordinate in the vertical direction in the intersection point set as xCI.e. xC＝min(xS,xF)|{Line[i,(xS,yS)]∩Flux[j,(xF,yF)]}; otherwise, calculating the horizontal coordinate of the vertical central line as
Figure FDA0003383453480000051
The mean function is an average value, the max function is a maximum value, and the min function is a minimum value;
s602, obtaining the formulaCOn a horizontal straight line of the cooling division line positionS,CAnd the ordinate y of the position of the blown bubbleF,CAnd judging the performance state Status of the LDPE antibacterial film: if yS,C≥yF,CIf the cooling split line is higher than the blown bubble, making Status flow, that is, the flow state, and jumping to step S700; otherwise, let Status be elastic, i.e. elastic state, and go to step S800.
7. The method for preparing the special film for aquaculture in Guangdong area according to claim 1, wherein in S700, the method for adjusting the performance parameters of the multilayer co-extrusion film blowing machine comprises the following steps:
s701, when the multilayer co-extrusion film blowing machine is used for film blowing treatment, the blow-up ratio is reduced by 0.05-0.2 unit every time, namely the initial blow-up ratio is 2.5-3.0, and the blow-up ratio is reduced by 0.05-0.2 every time;
s702, when the multilayer co-extrusion film blowing machine is used for cooling, 10% of the current cooling air volume is increased so as to improve the cooling effect of a bubble cooling air ring system;
s703, when the multilayer co-extrusion film blowing machine is used for traction film forming treatment, the traction ratio is reduced by 0.1-0.5 unit every time, namely the initial traction ratio is 4-8, and the traction ratio is reduced by 0.1-0.5 every time.
CN202111441286.3A 2021-11-30 2021-11-30 Special aquaculture membrane suitable for Guangdong area Pending CN114230890A (en)

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