CN112123620B - Preparation process of polypropylene composite material film based on bio-based wheat straw - Google Patents
Preparation process of polypropylene composite material film based on bio-based wheat straw Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/04—Making granules by dividing preformed material in the form of plates or sheets
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29B13/00—Conditioning or physical treatment of the material to be shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
- B29B9/14—Making granules characterised by structure or composition fibre-reinforced
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/287—Raw material pre-treatment while feeding
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2397/00—Characterised by the use of lignin-containing materials
- C08J2397/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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Abstract
The invention relates to a preparation process of a bio-based wheat straw polypropylene composite material film, which comprises the following steps: conveying the crushed straw particles to a neutralization cleaning pool; the neutralization cleaning pool is used for neutralizing and cleaning the straw particles; standing the straw particles in the hydrothermal reaction kettle at a constant temperature; drying the straw particles in a vacuum drying box; mixing the straw particles with the raw materials by a mixer; the screw extruder outputs the material to a film making machine to produce a film; according to the invention, the central control unit is connected with the corresponding component, the matrix Ri is established through the comparison result of the straw quality Ma and each item value in the Ma0 matrix to control each device to select the corresponding operation parameter, and the matrix Sj is established through the comparison result of each item value in the Mb and Mb0 matrix to select the corresponding raw material dosage and preparation process, so that the high-quality composite material can be rapidly prepared while the content of the straw particles is ensured to be in the preset interval, and the preparation efficiency of the process is improved.
Description
Technical Field
The invention relates to the technical field of biological environment-friendly composite materials, in particular to a preparation process of a wheat straw polypropylene composite material film based on a bio-base.
Background
The polypropylene material has a series of advantages of small density, high mechanical strength, good chemical resistance, low price, easy molding and the like, and is widely applied to various aspects of industry, agriculture, life and the like. However, the chemical inertness and surface energy of the polypropylene material are very low, the surface printing of the plastic product is difficult, and the application of the polypropylene material in a large amount brings great convenience to the production and life of human beings, and also causes serious white pollution to the prior environment.
Therefore, in order to increase the surface energy of the polypropylene material, those skilled in the art generally directly treat the surface of the material or product by chemical treatment, ozone treatment, corona discharge treatment, and the like. Chinese patent (application No. 201580066408.1) describes that the surface energy of a polypropylene polymer is increased to 55-60 dyne/cm through corona discharge treatment, so that the polypropylene polymer can be subjected to surface printing by using solvent-based or water-based ink, but after the polypropylene polymer is stored for 21 days, the surface energy of the polypropylene polymer is reduced to about 45 dyne/cm, and the retention rate is about 70%; alternatively, the printability of the polypropylene article can be improved by increasing the overall polarity of the polypropylene material by modification methods, such as mixing polypropylene with a polar material and grafting a polar monomer to the polypropylene material. Chinese patent (application No. 201210167452.X) describes a method of improving the polarity of polypropylene by blending polypropylene with nano inorganic powder, but this method requires adding a large amount of nano inorganic powder into polypropylene, which undoubtedly increases the cost of materials or products; chinese patent application No. 201410375294.6 describes that polypropylene is treated by supercritical carbon dioxide fluid containing polar monomer and initiator, and the treated polypropylene material is grafted, but during the grafting process, side reaction of polypropylene macromolecule degradation is easy to occur to degrade the material performance, and although the addition of comonomer during the grafting process can reduce the degradation side reaction, comonomer may induce polypropylene macromolecule crosslinking to affect the processability of polypropylene material.
The main components of the wheat straw are cellulose, hemicellulose 20-30% and lignin, the straw resources are rich in China, the annual output is as high as 7 x 109t, and the first in the world is that the wheat straw is 1.1 x 109t and accounts for 16% of the total amount of the straw. A part of the wheat straws rich in cellulose is incinerated, which not only causes resource waste, but also seriously pollutes the environment. On the contrary, after the wheat straw is properly treated, the internal structure of the plant fiber inside the wheat straw is greatly changed, namely, the internal surface and the external surface are changed into a concave-convex crack shape from a smooth and compact shape, the specific surface area is increased, the honeycomb structure of the cross section disappears, the components such as surface wax and partial lignin and hemicellulose connected with the fiber are removed, the contact angle is reduced, the surface energy is increased, and an oxygen-containing functional group can be introduced to improve the polarity of the wheat straw.
The prepared bio-based wheat straw polypropylene composite material can improve the surface printability of the polypropylene material through blending modification, reduce the cost, fully utilize straw resources, endow the material with proper decomposability, and reduce the consumption of non-renewable resources.
However, in the existing process for preparing the bio-based wheat straw polypropylene composite material, the usage amount of other raw materials cannot be flexibly adjusted according to the preset amount of the straw, so that the content of the straw is too high or too low when the composite material is prepared, and the quality of the composite material is unqualified.
Disclosure of Invention
Therefore, the invention provides a preparation process of a bio-based wheat straw polypropylene composite film, which is used for solving the problem of low preparation efficiency caused by the fact that corresponding raw materials cannot be selected according to the quality of straws and the preparation process in the prior art.
In order to achieve the purpose, the invention provides a preparation process of a polypropylene composite material film based on bio-based wheat straws, which comprises the following steps:
step 1: conveying the cleaned straws to a crusher, and after crushing, controlling the crusher by a central control unit to convey crushed straw particles to a neutralization cleaning pool;
step 2: the method comprises the steps that a NaOH tank conveys NaOH solution into a neutralization cleaning pool to enable straw particles to be soaked in the NaOH solution, a central control unit controls a first heater in the neutralization cleaning pool to heat the NaOH solution to adjust the temperature Ta of the NaOH solution when the NaOH solution is soaked, a timer in the central control unit can record the soaking time Ta of the straw particles when the temperature of the NaOH solution reaches a preset value, a central control module controls a neutralization tank to convey the neutralization solution into the neutralization cleaning pool to neutralize the straw particles when the soaking time reaches the preset value, a pH detector in the neutralization cleaning pool can detect the pH value of the solution in the neutralization cleaning pool in real time during neutralization, and the central control unit judges that neutralization is finished when the pH value of the solution in the neutralization cleaning pool is 7;
and step 3: after the neutralization is finished, the central control unit controls the neutralization cleaning pool to discharge a neutralization solution and controls the cleaning tank to convey clean water into the neutralization cleaning pool to clean the straw particles, and the straw particles are conveyed to the hydrothermal reaction kettle after the cleaning is finished;
and 4, step 4: the method comprises the following steps that a central control unit adjusts the internal temperature Tb of a hydrothermal reaction kettle to a preset value so as to carry out constant-temperature standing on internal straw particles, a timer in the central control unit records standing time Tb of the straw particles, when the standing time reaches the preset value, the central control unit cools the interior of the hydrothermal reaction kettle to room temperature, after cooling is completed, the central control unit controls the hydrothermal reaction kettle to convey the straw particles to a washing pool so as to clean the straw particles, and after cleaning is completed, the central control unit controls the washing pool to convey the straw particles to a vacuum drying box;
and 5: the vacuum drying oven dries the straw particles, a humidity detector in the vacuum drying oven detects the humidity D in the vacuum drying oven in real time in the drying process, and when the humidity value reaches a preset value, the central control unit judges that the vacuum drying oven finishes drying the straw particles and conveys the straw particles to the mixing machine;
step 6: a weighing device is arranged in the mixing machine, when the vacuum drying box conveys the straw particles to the mixing machine, the weighing device detects the mass Mb of the straw particles, the central control unit sequentially controls the PP material tank, the PE material tank, the toughening agent tank and the compatilizer tank according to the Mb value to respectively convey PP materials, PE materials, toughening agents and compatilizers with corresponding mass into the mixing machine, after the conveying is finished, the central control unit adjusts the stirring rotating speed wa and the stirring time tc of the mixing machine according to the Mb value, and after the mixing is finished, the central control unit controls the mixed materials to be conveyed to the screw extruder of the mixing machine;
and 7: the central control unit adjusts the rotating speed wb and the discharging temperature Tc of a screw in the screw extruder according to the Mb value, and the screw extruder outputs materials to a film making machine during operation so as to prepare a bio-based wheat straw polypropylene composite material film;
the central control unit is internally provided with a straw preset quality matrix Ma0 and a preset pretreatment matrix group A; for straw preset mass matrixes Ma0 and Ma0(Ma1, Ma2, Ma3 and Ma4), wherein Ma1 is a first preset mass of straw, Ma2 is a second preset mass of straw, Ma3 is a third preset mass of straw, Ma4 is a fourth preset mass of straw, and the mass values of the preset masses are gradually increased in sequence; for a preset pretreatment matrix group A, A (Ta0, Ta0, Tb0, Tb0 and D0), wherein Ta0 is a NaOH solution preset temperature matrix, Ta0 is a preset soaking time matrix, Tb0 is a preset standing temperature matrix, Tb0 is a preset standing time matrix, and D0 is a preset humidity matrix;
for NaOH solution preset temperature matrixes Ta0, Ta0(Ta1, Ta2, Ta3, Ta4), wherein Ta1 is a first NaOH solution preset temperature, Ta2 is a second NaOH solution preset temperature, Ta3 is a third NaOH solution preset temperature, Ta4 is a fourth NaOH solution preset temperature, and numerical values of the preset temperatures are gradually increased in sequence;
for the preset soaking time matrixes ta0, ta0(ta1, ta2, ta3, ta4), wherein ta1 is a first preset soaking time, ta2 is a second preset soaking time, ta3 is a third preset soaking time, ta4 is a fourth preset soaking time, and the numerical values of the preset soaking times are gradually increased in sequence;
for the preset standing temperature matrixes Tb0, Tb0(Tb1, Tb2, Tb3, Tb4), where Tb1 is a first preset standing temperature, Tb2 is a second preset standing temperature, Tb3 is a third preset standing temperature, Tb4 is a fourth preset standing temperature, and the values of the preset standing temperatures are gradually increased in sequence;
for the preset standing time matrixes tb0 and tb0(tb1, tb2, tb3 and tb4), wherein tb1 is a first preset standing time, tb2 is a second preset standing time, tb3 is a third preset standing time, tb4 is a fourth preset standing time, and the numerical values of the preset standing times are gradually increased in sequence;
for the preset humidity matrixes D0, D0(D1, D2, D3, D4), wherein D1 is a first preset humidity, D2 is a second preset humidity, D3 is a third preset humidity, and D4 is a fourth preset humidity, the numerical values of the preset humidities are gradually increased in sequence;
before conveying cleaned straws to a pulverizer, weighing the straws to obtain the mass Ma of the straws, and comparing the Ma with each preset mass value in a Ma0 matrix by a central control unit:
when Ma is not more than Ma1, the central control unit sequentially selects Ta1 from a Ta0 matrix, Ta1 from a Ta0 matrix, Tb1 from a Tb0 matrix, Tb1 from a Tb0 matrix and D1 from a D0 matrix, and establishes a predetermined case matrix R1(Ta1, Ta1, Tb1, Tb1 and D1);
when Ma1 is more than or equal to Ma2, the central control unit selects Ta2 from a Ta0 matrix, selects Ta2 from a Ta0 matrix, selects Tb2 from a Tb0 matrix, selects Tb2 from a Tb0 matrix and selects D2 from a D0 matrix in sequence to establish a plan matrix R2(Ta2, Ta2, Tb2, Tb2 and D2);
when Ma2 is more than or equal to Ma3, the central control unit selects Ta3 from a Ta0 matrix, selects Ta3 from a Ta0 matrix, selects Tb3 from a Tb0 matrix, selects Tb3 from a Tb0 matrix and selects D3 from a D0 matrix in sequence to establish a plan matrix R3(Ta3, Ta3, Tb3, Tb3 and D3);
when Ma3 is more than or equal to Ma4, the central control unit selects Ta4 from a Ta0 matrix, selects Ta4 from a Ta0 matrix, selects Tb4 from a Tb0 matrix, selects Tb4 from a Tb0 matrix and selects D4 from a D0 matrix in sequence to establish a plan matrix R4(Ta4, Ta4, Tb4, Tb4 and D4);
when the central control unit establishes a predetermined matrix Ri (Tai, Tai, Tbi, Tbi, Di), i is 1, 2, 3, 4, the central control unit sets the preset heating temperature of NaOH solution in the neutralization cleaning pool to Tai, sets the preset soaking time of straw particles in the NaOH solution in the neutralization cleaning pool to Tai, adjusts the preset net value temperature of the hydrothermal reaction kettle to Tbi, sets the preset standing time of the straw particles in the hydrothermal reaction kettle to Tbi, and sets the preset humidity in the vacuum drying box to Di.
Further, a straw particle set mass matrix Mb0, a preset material matrix group Q0 and a preset mixing matrix group H0 are also arranged in the central control unit; the straw particle preset mass matrixes Mb0 and Mb0(Mb1, Mb2, Mb3 and Mb4), wherein Mb1 is the first preset mass of the straw particles, Mb2 is the second preset mass of the straw particles, Mb3 is the third preset mass of the straw particles, Mb4 is the fourth preset mass of the straw particles, and the mass values of the preset masses are gradually increased in sequence;
the preset material matrix group Q0(Qpp0, Qpe0, Qz0, Qx0), wherein Qpp0 is a PP material tank preset charging matrix, Qpe0 is a PE material tank preset charging matrix, Qz0 is a toughening agent tank preset charging matrix, and Qx0 is a compatilizer tank preset charging matrix; presetting a charging matrix Qpp0, Qpp0(Qpp1, Qpp2, Qpp3 and Qpp4) for a PP material tank, wherein Qpp1 is a first preset charging amount of the PP material tank, Qpp2 is a second preset charging amount of the PP material tank, Qpp3 is a third preset charging amount of the PP material tank, Qpp4 is a fourth preset charging amount of the PP material tank, and the mass of each preset charging amount is gradually increased in sequence;
presetting feeding matrixes Qpe0 and Qpe0(Qpe1, Qpe2, Qpe3 and Qpe4) for the PE material tank, wherein Qpe1 is a first preset feeding amount of the PE material tank, Qpe2 is a second preset feeding amount Qpe3 of the PE material tank, a third preset feeding amount Qpe4 of the PE material tank is a fourth preset feeding amount of the PE material tank, and the mass of each preset feeding amount is gradually increased in sequence;
presetting a charging matrix Qz0 and Qz0(Qz1, Qz2, Qz3 and Qz4) for the toughening agent tank, wherein Qz1 is a first preset charging amount of the toughening agent tank, Qz2 is a second preset charging amount of the toughening agent tank, Qz3 is a third preset charging amount of the toughening agent tank, Qz4 is a fourth preset charging amount of the toughening agent tank, and the mass of each preset charging amount is gradually increased in sequence;
presetting a charging matrix Qx0 and Qx0(Qx1, Qx2, Qx3 and Qx4) for the compatilizer tank, wherein Qx1 is a first preset charging amount of the compatilizer tank, Qx2 is a second preset charging amount of the compatilizer tank, Qx3 is a third preset charging amount of the compatilizer tank, Qx4 is a fourth preset charging amount of the compatilizer tank, and the mass of each preset charging amount is gradually increased in sequence;
the preset mixing matrix groups H0 and H0(wa0, Tc0, wb0 and Tc0), wherein wa0 is a preset rotating speed matrix of the stirrer, Tc0 is a preset stirring time matrix of the stirrer, wb0 is a preset rotating speed matrix of the screw extruder, and Tc0 is a preset discharging temperature matrix of the screw extruder;
for the preset rotation speed matrixes wa0 and wa0(wa1, wa2, wa3 and wa4) of the stirrer, wherein wa1 is the first preset rotation speed of the stirrer, wa2 is the second preset rotation speed of the stirrer, wa3 is the third preset rotation speed of the stirrer, wa4 is the fourth preset rotation speed of the stirrer, and the numerical values of the rotation speeds are gradually increased in sequence;
presetting a stirring time matrix tc0 and tc0(tc1, tc2, tc3 and tc4) for the stirrer, wherein tc1 is a first preset stirring time of the stirrer, tc2 is a second preset stirring time of the stirrer, tc3 is a third preset stirring time of the stirrer, tc4 is a fourth preset stirring time of the stirrer, and the rotating speed values are gradually increased in sequence;
for a screw extruder preset rotation speed matrix wb0, wb0(wb1, wb2, wb3, wb4), wherein wb1 is a first preset rotation speed of the screw extruder, wb2 is a second preset rotation speed of the screw extruder, wb3 is a third preset rotation speed of the screw extruder, wb4 is a fourth preset rotation speed of the screw extruder, and the numerical values of the rotation speeds are gradually increased in sequence;
for a screw extruder preset discharge temperature matrix Tc0, Tc0(Tc1, Tc2, Tc3, Tc4), wherein Tc1 is a first preset discharge temperature of the screw extruder, Tc2 is a second preset discharge temperature of the screw extruder, Tc3 is a third preset discharge temperature of the screw extruder, Tc4 is a fourth preset discharge temperature of the screw extruder, and the temperature values are gradually increased in sequence;
when the straw particles enter the stirrer, the weigher can detect the mass Mb of the straw particles, and the central control unit compares the Mb with each preset mass value in an Mb0 matrix:
when Mb is less than or equal to Mb1, the central control unit sequentially selects Qpp1 from a Qpp0 matrix, Qpe1 from a Qpe0 matrix, Qz1 from a Qz0 matrix, Qx1 from a Qx0 matrix, wa1 from a wa0 matrix, Tc1 from a Tc0 matrix, wb1 from a wb0 matrix, and Tc1 from a Tc0 matrix, and establishes a mixed plan matrix S1(Qpp1, Qpe1, Qz1, Qx1, wa1, Tc1, wb1, Tc 1);
when Mb1 is more than Mb and less than or equal to Mb2, the central control unit sequentially selects Qpp2 from a Qpp0 matrix, Qpe2 from a Qpe0 matrix, Qz2 from a Qz0 matrix, Qx2 from a Qx0 matrix, wa2 from a wa0 matrix, Tc2 from a Tc0 matrix, wb2 from a wb0 matrix, Tc2 from a Tc0 matrix, and establishes a mixed plan matrix S2(Qpp2, Qpe2, Qz2, Qx2, wa2, Tc2, wb2 and Tc 2);
when Mb2 is more than Mb and less than or equal to Mb3, the central control unit sequentially selects Qpp3 from a Qpp0 matrix, Qpe3 from a Qpe0 matrix, Qz3 from a Qz0 matrix, Qx3 from a Qx0 matrix, wa3 from a wa0 matrix, Tc3 from a Tc0 matrix, wb3 from a wb0 matrix, Tc3 from a Tc0 matrix, and establishes a mixed plan matrix S3(Qpp3, Qpe3, Qz3, Qx3, wa3, Tc3, wb3 and Tc 3);
when Mb3 is more than Mb and less than or equal to Mb4, the central control unit sequentially selects Qpp4 from a Qpp0 matrix, Qpe4 from a Qpe0 matrix, Qz4 from a Qz0 matrix, Qx4 from a Qx0 matrix, wa4 from a wa0 matrix, Tc4 from a Tc0 matrix, wb4 from a wb0 matrix, Tc4 from a Tc0 matrix, and establishes a mixed plan matrix S4(Qpp4, Qpe4, Qz4, Qx4, wa4, Tc4, wb4 and Tc 4);
when the central control unit establishes a mixing plan matrix Sj (Qppj, Qpej, Qzj, Qxj, waj, tcj, wbj and Tcj), j is 1, 2, 3 and 4, the preset charging amount of a PP material tank of the central control unit is adjusted to Qppj, the preset charging amount of a PE material tank is adjusted to Qpej, the preset charging amount of a toughening agent tank is adjusted to Qzj, the preset charging amount of a compatilizer tank is adjusted to Qxj, the preset rotating speed of a stirrer is adjusted to waj, the preset stirring time of the stirrer is adjusted to tcj, the preset rotating speed of a screw extruder is adjusted to wbj, and the preset discharging temperature of the screw extruder is adjusted to Tcj.
Further, the toughening agent is one or more of ethylene-octene copolymer, ethylene-vinyl acetate copolymer and ethylene-butene copolymer.
Further, the compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted polypropylene wax.
Further, the neutralization solution is an acetic acid solution.
Further, the mixer is a high speed mixer.
Further, the screw extruder employs twin screws.
Compared with the prior art, the invention has the advantages that the quality Ma of the straw is detected by using the central control unit to be connected with the corresponding component, the matrix Ri (Tai, Tai, Tbi, Tbi and Di) is established according to the comparison result and the equipment is controlled according to the matrix Ri to select the corresponding operation parameters so as to enable the treated straw particles to be more suitable for the preparation of the composite material film based on the bio-based wheat straw and polypropylene, meanwhile, the process also detects the quality Mb of the treated straw particles and compares the quality Mb with the values in the Mb0 matrix, the matrix Sj (Qppj, Qpej, Qzj, Qxj, waj, tcj, wbj and Tcj) is established according to the comparison result, the corresponding raw material consumption and preparation process are selected according to the Sj matrix, the content of the straw particles can be ensured in a preset interval, the high-quality composite material film is rapidly prepared, and the preparation efficiency of the process is improved.
Furthermore, the treated wheat straw is compatible with the polypropylene material, so that the polarity of the wheat straw is improved, and the surface energy is increased, so that the prepared bio-based wheat straw polypropylene composite material film has surface printability.
Furthermore, the bio-based wheat straw polypropylene composite film can be printed and manufactured into shopping bags, shower curtains, table cloth, lamp decorations and other household daily necessities, has plant fragrance, does not have the taste of common plastic products, can be degraded, can be directly contacted with food, is environment-friendly, and has good application potential and wide industrial production value.
Furthermore, the bio-based wheat straw polypropylene composite film has good mechanical property, easy processability, small product deformation and good heat resistance.
Furthermore, the invention adopts the wheat straws and the PP material as main raw materials, thereby realizing the change of the wheat straws into valuable, saving petroleum resources, reducing the using amount of the PP material during the production of plastics, and the physical properties of the produced product are basically the same as those of the traditional plastics.
Furthermore, the PP material and the PE material of the bio-based wheat straw polypropylene composite material film are obviously reduced, and the elasticity coefficient of the whole composite material film is increased through the modification of the wheat straw, so that the sound wave vibration attenuation reaction of the bio-based wheat straw polypropylene composite material film in ultrasonic welding is weakened, and the welding performance is greatly improved.
Furthermore, the bio-based wheat straw polypropylene composite material film can be made into shopping bags, shower curtains, table cloth, lamp decorations and other household daily ornaments, the appearance of the product is smooth, the surface printing can be directly carried out, and the requirements of the commodity industry and other logistics fields can be met.
Drawings
FIG. 1 is a schematic structural diagram of a system using the preparation process of the bio-based wheat straw polypropylene composite film according to the invention;
FIG. 2 is a process flow diagram of the preparation process of the bio-based wheat straw polypropylene composite film.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Please refer to fig. 1, which is a schematic structural diagram of a system using the bio-based wheat straw polypropylene composite film preparation process according to the present invention; the system comprises a pulverizer, a neutralization cleaning pool, a hydrothermal reaction kettle, a water washing pool, a vacuum drying box, a mixing machine, a screw extruder and a film making machine. The neutralizing and cleaning pool is connected with the pulverizer and is used for neutralizing and soaking straw particles output by the pulverizer. Hydrothermal reaction kettle with the neutralization is washd the pond and is linked to each other for the straw granule of centering and washing pond output carries out high temperature and stews wash the pond with hydrothermal reaction kettle links to each other for wash the straw granule of hydrothermal reaction kettle output, vacuum drying cabinet with wash the pond and link to each other, be used for washing the straw granule of accomplishing in pond and carry out the drying, mix the machine with vacuum drying cabinet links to each other for mix straw granule and appointed raw materials, screw extruder with mix the machine and link to each other, be used for carrying out the basis with the raw materials that mix the machine and accomplish, film making machine with screw extruder links to each other for the raw materials to screw extruder output carries out the granulation. When the system operates, straws are conveyed to a pulverizer to be pulverized, pulverized straw particles enter a neutralization cleaning pool, the pulverized straw particles are conveyed to a hydrothermal reaction kettle after being neutralized, soaked and cleaned, the hydrothermal reaction kettle is used for standing the straw particles at a high temperature, the straw particles after standing are conveyed to the washing pool to be cleaned, the straw particles after being cleaned enter a vacuum drying box to be dried, the straw particles after drying are conveyed to a mixing machine by the vacuum drying box, the mixing machine is used for mixing the straw particles with other raw materials and then conveying the mixed raw materials to a screw extruder, the screw extruder extrudes the raw materials to a film making machine, and the film making machine is used for granulating so as to complete preparation of the composite material based on the bio-based wheat straw and polypropylene. Specifically, the screw extruder employs twin screws.
Referring to fig. 1, the neutralization and washing tank of the present invention is further connected to a NaOH tank, a neutralization tank, and a washing tank, respectively, and a drain valve, a temperature detector (not shown), and a pH detector (not shown) are further disposed in the neutralization and washing tank. When the system moves, the rubbing crusher carries the straw granule to and inside the washing pond, and the NaOH jar is carried the NaOH solution to and is washd the pond inside in order to soak the straw granule, when soak time reaches the default, and the neutralization jar will be carried the neutralization solution to and carry out neutralization with the NaOH solution in the washing pond, when pH detector detects that solution pH is 7 in the pond, the neutralization jar stops to carry the neutralization solution, and the drain valve is opened and is discharged solution, and the washing jar carries the clear water in order to wash the straw granule to the pond.
Specifically, the neutralization solution is an acetic acid solution.
Referring to fig. 1, a humidity detector (not shown) is disposed in the vacuum drying oven for detecting humidity in the vacuum drying oven, when the vacuum drying oven dries the straw particles, the humidity detector can detect humidity in the vacuum drying oven in real time, and when the humidity in the vacuum drying oven reaches a predetermined value, the vacuum drying oven stops drying.
Referring to fig. 1, a weighing device (not shown) is disposed in the mixing machine for detecting the quality of the straw particles. The mixer is also respectively connected with a PP material tank, a PE material tank, a toughening agent tank and a compatilizer tank. When the system operates, the weighing device detects the quality of straw particles and controls the PP material tank, the PE material tank, the toughening agent tank and the compatilizer tank to respectively convey PP materials, PE materials, toughening agents and compatilizers with corresponding quality to the mixer according to detection values, and after the PP materials, the PE materials, the toughening agents and the compatilizers are added, the mixer is started to stir raw materials.
In particular, the mixer is a high speed mixer.
Specifically, the toughening agent is one or more of ethylene-octene copolymer, ethylene-vinyl acetate copolymer and ethylene-butene copolymer.
Specifically, the compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted polypropylene wax.
With continued reference to fig. 1, the system of the present invention further comprises a central control unit (not shown), which is connected to each of the above components, respectively, for controlling the amount of material added to each of the tanks and the operating parameters of each component in the system according to the quality of the straw and the quality of the straw particles. And a timer is also arranged in the central control unit and used for respectively recording the running time of each device.
Please refer to fig. 2, which is a process flow chart of the preparation process of the bio-based wheat straw polypropylene composite film according to the present invention. The method comprises the following steps:
step 1: conveying the cleaned straws to a crusher, and after crushing, controlling the crusher by a central control unit to convey crushed straw particles to a neutralization cleaning pool;
step 2: the method comprises the steps that a NaOH tank conveys NaOH solution into a neutralization cleaning pool to enable straw particles to be soaked in the NaOH solution, a central control unit controls a first heater in the neutralization cleaning pool to heat the NaOH solution to adjust the temperature Ta of the NaOH solution when the NaOH solution is soaked, a timer in the central control unit can record the soaking time Ta of the straw particles when the temperature of the NaOH solution reaches a preset value, a central control module controls a neutralization tank to convey the neutralization solution into the neutralization cleaning pool to neutralize the straw particles when the soaking time reaches the preset value, a pH detector in the neutralization cleaning pool can detect the pH value of the solution in the neutralization cleaning pool in real time during neutralization, and the central control unit judges that neutralization is finished when the pH value of the solution in the neutralization cleaning pool is 7;
and step 3: after the neutralization is finished, the central control unit controls the neutralization cleaning pool to discharge a neutralization solution and controls the cleaning tank to convey clean water into the neutralization cleaning pool to clean the straw particles, and the straw particles are conveyed to the hydrothermal reaction kettle after the cleaning is finished;
and 4, step 4: the method comprises the following steps that a central control unit adjusts the internal temperature Tb of a hydrothermal reaction kettle to a preset value so as to carry out constant-temperature standing on internal straw particles, a timer in the central control unit records standing time Tb of the straw particles, when the standing time reaches the preset value, the central control unit cools the interior of the hydrothermal reaction kettle to room temperature, after cooling is completed, the central control unit controls the hydrothermal reaction kettle to convey the straw particles to a washing pool so as to clean the straw particles, and after cleaning is completed, the central control unit controls the washing pool to convey the straw particles to a vacuum drying box;
and 5: the vacuum drying oven dries the straw particles, a humidity detector in the vacuum drying oven detects the humidity D in the vacuum drying oven in real time in the drying process, and when the humidity value reaches a preset value, the central control unit judges that the vacuum drying oven finishes drying the straw particles and conveys the straw particles to the mixing machine;
step 6: a weighing device is arranged in the mixing machine, when the vacuum drying box conveys the straw particles to the mixing machine, the weighing device detects the mass Mb of the straw particles, the central control unit sequentially controls the PP material tank, the PE material tank, the toughening agent tank and the compatilizer tank according to the Mb value to respectively convey PP materials, PE materials, toughening agents and compatilizers with corresponding mass into the mixing machine, after the conveying is finished, the central control unit adjusts the stirring rotating speed wa and the stirring time tc of the mixing machine according to the Mb value, and after the mixing is finished, the central control unit controls the mixed materials to be conveyed to the screw extruder of the mixing machine;
and 7: the central control unit adjusts the rotating speed wb and the discharging temperature Tc of a screw in the screw extruder according to the Mb value, and the screw extruder outputs materials to a film making machine during operation; and granulating and drying the material by using a film making machine to obtain the bio-based wheat straw polypropylene composite material.
Specifically, a straw preset quality matrix Ma0 and a preset pretreatment matrix group A are arranged in the central control unit; for straw preset mass matrixes Ma0 and Ma0(Ma1, Ma2, Ma3 and Ma4), wherein Ma1 is a first preset mass of straw, Ma2 is a second preset mass of straw, Ma3 is a third preset mass of straw, Ma4 is a fourth preset mass of straw, and the mass values of the preset masses are gradually increased in sequence; for the preset pretreatment matrix group a, a (Ta0, Ta0, Tb0, Tb0, D0), wherein Ta0 is a preset temperature matrix of NaOH solution, Ta0 is a preset soaking time matrix, Tb0 is a preset standing temperature matrix, Tb0 is a preset standing time matrix, and D0 is a preset humidity matrix.
And for the NaOH solution preset temperature matrix Ta0, Ta0(Ta1, Ta2, Ta3, Ta4), wherein Ta1 is the first NaOH solution preset temperature, Ta2 is the second NaOH solution preset temperature, Ta3 is the third NaOH solution preset temperature, Ta4 is the fourth NaOH solution preset temperature, and the numerical values of the preset temperatures are gradually increased in sequence.
For the preset soaking time matrixes ta0, ta0(ta1, ta2, ta3, ta4), wherein ta1 is a first preset soaking time, ta2 is a second preset soaking time, ta3 is a third preset soaking time, ta4 is a fourth preset soaking time, and the numerical values of the preset soaking times are gradually increased in sequence.
For the preset standing temperature matrixes Tb0, Tb0(Tb1, Tb2, Tb3, Tb4), where Tb1 is a first preset standing temperature, Tb2 is a second preset standing temperature, Tb3 is a third preset standing temperature, Tb4 is a fourth preset standing temperature, and the values of the preset standing temperatures are gradually increased in order.
For the preset standing time matrixes tb0 and tb0(tb1, tb2, tb3 and tb4), wherein tb1 is the first preset standing time, tb2 is the second preset standing time, tb3 is the third preset standing time, tb4 is the fourth preset standing time, and the numerical values of the preset standing times are gradually increased in sequence.
For the preset humidity matrices D0, D0(D1, D2, D3, D4), where D1 is a first preset humidity, D2 is a second preset humidity, D3 is a third preset humidity, and D4 is a fourth preset humidity, the values of the preset humidities gradually increase in order.
Before conveying cleaned straws to a pulverizer, weighing the straws to obtain the mass Ma of the straws, and comparing the Ma with each preset mass value in a Ma0 matrix by a central control unit:
when Ma is not more than Ma1, the central control unit sequentially selects Ta1 from a Ta0 matrix, Ta1 from a Ta0 matrix, Tb1 from a Tb0 matrix, Tb1 from a Tb0 matrix and D1 from a D0 matrix, and establishes a predetermined case matrix R1(Ta1, Ta1, Tb1, Tb1 and D1);
when Ma1 is more than or equal to Ma2, the central control unit selects Ta2 from a Ta0 matrix, selects Ta2 from a Ta0 matrix, selects Tb2 from a Tb0 matrix, selects Tb2 from a Tb0 matrix and selects D2 from a D0 matrix in sequence to establish a plan matrix R2(Ta2, Ta2, Tb2, Tb2 and D2);
when Ma2 is more than or equal to Ma3, the central control unit selects Ta3 from a Ta0 matrix, selects Ta3 from a Ta0 matrix, selects Tb3 from a Tb0 matrix, selects Tb3 from a Tb0 matrix and selects D3 from a D0 matrix in sequence to establish a plan matrix R3(Ta3, Ta3, Tb3, Tb3 and D3);
when Ma3 is more than or equal to Ma4, the central control unit selects Ta4 from a Ta0 matrix, Ta4 from a Ta0 matrix, Tb4 from a Tb0 matrix, Tb4 from a Tb0 matrix and D4 from a D0 matrix in sequence, and establishes a plan matrix R4(Ta4, Ta4, Tb4, Tb4 and D4).
When the central control unit establishes a predetermined matrix Ri (Tai, Tai, Tbi, Tbi, Di), i is 1, 2, 3, 4, the central control unit sets the preset heating temperature of NaOH solution in the neutralization cleaning pool to Tai, sets the preset soaking time of straw particles in the NaOH solution in the neutralization cleaning pool to Tai, adjusts the preset net value temperature of the hydrothermal reaction kettle to Tbi, sets the preset standing time of the straw particles in the hydrothermal reaction kettle to Tbi, and sets the preset humidity in the vacuum drying box to Di.
Specifically, the central control unit is also provided with a straw particle set mass matrix Mb0, a preset material matrix group Q0 and a preset mixing matrix group H0; the straw particle preset mass matrixes Mb0 and Mb0(Mb1, Mb2, Mb3 and Mb4), wherein Mb1 is the first preset mass of the straw particles, Mb2 is the second preset mass of the straw particles, Mb3 is the third preset mass of the straw particles, Mb4 is the fourth preset mass of the straw particles, and the mass values of the preset masses are gradually increased in sequence.
The preset material matrix group Q0(Qpp0, Qpe0, Qz0, Qx0), wherein Qpp0 is a PP material tank preset charging matrix, Qpe0 is a PE material tank preset charging matrix, Qz0 is a toughening agent tank preset charging matrix, and Qx0 is a compatilizer tank preset charging matrix; the method comprises the steps of presetting a charging matrix Qpp0, Qpp0(Qpp1, Qpp2, Qpp3 and Qpp4) for a PP material tank, wherein the Qpp1 is a first preset charging amount of the PP material tank, the Qpp2 is a second preset charging amount of the PP material tank, the Qpp3 is a third preset charging amount of the PP material tank, the Qpp4 is a fourth preset charging amount of the PP material tank, and the quality of the preset charging amounts gradually increases in sequence.
The PE material tank is preset with feeding matrixes Qpe0 and Qpe0(Qpe1, Qpe2, Qpe3 and Qpe4), wherein Qpe1 is a first preset feeding amount of the PE material tank, Qpe2 is a second preset feeding amount Qpe3 of the PE material tank, a third preset feeding amount Qpe4 of the PE material tank is a fourth preset feeding amount of the PE material tank, and the mass of the preset feeding amounts is gradually increased in sequence.
A toughening agent tank is preset with a charging matrix Qz0, Qz0(Qz1, Qz2, Qz3, Qz4), wherein Qz1 is a first preset charging amount of the toughening agent tank, Qz2 is a second preset charging amount of the toughening agent tank, Qz3 is a third preset charging amount of the toughening agent tank, Qz4 is a fourth preset charging amount of the toughening agent tank, and the mass of each preset charging amount is gradually increased in sequence.
A charging matrix Qx0 and Qx0(Qx1, Qx2, Qx3 and Qx4) are preset for the compatilizer tank, wherein Qx1 is a first preset charging amount of the compatilizer tank, Qx2 is a second preset charging amount of the compatilizer tank, Qx3 is a third preset charging amount of the compatilizer tank, Qx4 is a fourth preset charging amount of the compatilizer tank, and the mass of the preset charging amounts is gradually increased in sequence.
The preset mixing matrix groups are H0 and H0(wa0, Tc0, wb0 and Tc0), wherein wa0 is a preset rotating speed matrix of the stirrer, Tc0 is a preset stirring time matrix of the stirrer, wb0 is a preset rotating speed matrix of the screw extruder, and Tc0 is a preset discharging temperature matrix of the screw extruder.
For the preset rotation speed matrixes wa0 and wa0(wa1, wa2, wa3 and wa4) of the stirring machine, wherein wa1 is the first preset rotation speed of the stirring machine, wa2 is the second preset rotation speed of the stirring machine, wa3 is the third preset rotation speed of the stirring machine, and wa4 is the fourth preset rotation speed of the stirring machine, and the numerical values of the rotation speeds are gradually increased in sequence.
Presetting a stirring time matrix tc0 and tc0(tc1, tc2, tc3 and tc4) for the stirrer, wherein tc1 is a first preset stirring time of the stirrer, tc2 is a second preset stirring time of the stirrer, tc3 is a third preset stirring time of the stirrer, tc4 is a fourth preset stirring time of the stirrer, and the rotating speed values are gradually increased in sequence;
for the screw extruder preset rotation speed matrixes wb0, wb0(wb1, wb2, wb3, wb4), wherein wb1 is a first preset rotation speed of the screw extruder, wb2 is a second preset rotation speed of the screw extruder, wb3 is a third preset rotation speed of the screw extruder, wb4 is a fourth preset rotation speed of the screw extruder, and the values of the rotation speeds are gradually increased in sequence.
The preset discharge temperature matrix Tc0, Tc0(Tc1, Tc2, Tc3, Tc4) of the screw extruder is provided, wherein Tc1 is a first preset discharge temperature of the screw extruder, Tc2 is a second preset discharge temperature of the screw extruder, Tc3 is a third preset discharge temperature of the screw extruder, Tc4 is a fourth preset discharge temperature of the screw extruder, and the temperature values are gradually increased in sequence.
When the straw particles enter the stirrer, the weigher can detect the mass Mb of the straw particles, and the central control unit compares the Mb with each preset mass value in an Mb0 matrix:
when Mb is less than or equal to Mb1, the central control unit sequentially selects Qpp1 from a Qpp0 matrix, Qpe1 from a Qpe0 matrix, Qz1 from a Qz0 matrix, Qx1 from a Qx0 matrix, wa1 from a wa0 matrix, Tc1 from a Tc0 matrix, wb1 from a wb0 matrix, and Tc1 from a Tc0 matrix, and establishes a mixed plan matrix S1(Qpp1, Qpe1, Qz1, Qx1, wa1, Tc1, wb1, Tc 1);
when Mb1 is more than Mb and less than or equal to Mb2, the central control unit sequentially selects Qpp2 from a Qpp0 matrix, Qpe2 from a Qpe0 matrix, Qz2 from a Qz0 matrix, Qx2 from a Qx0 matrix, wa2 from a wa0 matrix, Tc2 from a Tc0 matrix, wb2 from a wb0 matrix, Tc2 from a Tc0 matrix, and establishes a mixed plan matrix S2(Qpp2, Qpe2, Qz2, Qx2, wa2, Tc2, wb2 and Tc 2);
when Mb2 is more than Mb and less than or equal to Mb3, the central control unit sequentially selects Qpp3 from a Qpp0 matrix, Qpe3 from a Qpe0 matrix, Qz3 from a Qz0 matrix, Qx3 from a Qx0 matrix, wa3 from a wa0 matrix, Tc3 from a Tc0 matrix, wb3 from a wb0 matrix, Tc3 from a Tc0 matrix, and establishes a mixed plan matrix S3(Qpp3, Qpe3, Qz3, Qx3, wa3, Tc3, wb3 and Tc 3);
when Mb3 is less than Mb and less than Mb4, the central control unit sequentially selects Qpp4 from a Qpp0 matrix, Qpe4 from a Qpe0 matrix, Qz4 from a Qz0 matrix, Qx4 from a Qx0 matrix, wa4 from a wa0 matrix, Tc4 from a Tc0 matrix, wb4 from a wb0 matrix, and Tc4 from a Tc0 matrix, and establishes a mixed plan matrix S4(Qpp4, Qpe4, Qz4, Qx4, wa4, Tc4, wb4 and Tc 4).
When the central control unit establishes a mixing plan matrix Sj (Qppj, Qpej, Qzj, Qxj, waj, tcj, wbj and Tcj), j is 1, 2, 3 and 4, the preset charging amount of a PP material tank of the central control unit is adjusted to Qppj, the preset charging amount of a PE material tank is adjusted to Qpej, the preset charging amount of a toughening agent tank is adjusted to Qzj, the preset charging amount of a compatilizer tank is adjusted to Qxj, the preset rotating speed of a stirrer is adjusted to waj, the preset stirring time of the stirrer is adjusted to tcj, the preset rotating speed of a screw extruder is adjusted to wbj, and the preset discharging temperature of the screw extruder is adjusted to Tcj.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation process of a bio-based wheat straw polypropylene composite material film is characterized by comprising the following steps of:
step 1: conveying the cleaned straws to a crusher, and after crushing, controlling the crusher by a central control unit to convey crushed straw particles to a neutralization cleaning pool;
step 2: the method comprises the steps that a NaOH tank conveys NaOH solution into a neutralization cleaning pool to enable straw particles to be soaked in the NaOH solution, a central control unit controls a first heater in the neutralization cleaning pool to heat the NaOH solution to adjust the temperature Ta of the NaOH solution when the NaOH solution is soaked, a timer in the central control unit can record the soaking time Ta of the straw particles when the temperature of the NaOH solution reaches a preset value, a central control module controls a neutralization tank to convey the neutralization solution into the neutralization cleaning pool to neutralize the straw particles when the soaking time reaches the preset value, a pH detector in the neutralization cleaning pool can detect the pH value of the solution in the neutralization cleaning pool in real time during neutralization, and the central control unit judges that neutralization is finished when the pH value of the solution in the neutralization cleaning pool is 7;
and step 3: after the neutralization is finished, the central control unit controls the neutralization cleaning pool to discharge a neutralization solution and controls the cleaning tank to convey clean water into the neutralization cleaning pool to clean the straw particles, and the straw particles are conveyed to the hydrothermal reaction kettle after the cleaning is finished;
and 4, step 4: the method comprises the following steps that a central control unit adjusts the internal temperature Tb of a hydrothermal reaction kettle to a preset value so as to carry out constant-temperature standing on internal straw particles, a timer in the central control unit records standing time Tb of the straw particles, when the standing time reaches the preset value, the central control unit cools the interior of the hydrothermal reaction kettle to room temperature, after cooling is completed, the central control unit controls the hydrothermal reaction kettle to convey the straw particles to a washing pool so as to clean the straw particles, and after cleaning is completed, the central control unit controls the washing pool to convey the straw particles to a vacuum drying box;
and 5: the vacuum drying oven dries the straw particles, a humidity detector in the vacuum drying oven detects the humidity D in the vacuum drying oven in real time in the drying process, and when the humidity value reaches a preset value, the central control unit judges that the vacuum drying oven finishes drying the straw particles and conveys the straw particles to the mixing machine;
step 6: a weighing device is arranged in the mixing machine, when the vacuum drying box conveys the straw particles to the mixing machine, the weighing device detects the mass Mb of the straw particles, the central control unit sequentially controls the PP material tank, the PE material tank, the toughening agent tank and the compatilizer tank according to the Mb value to respectively convey PP materials, PE materials, toughening agents and compatilizers with corresponding mass into the mixing machine, after the conveying is finished, the central control unit adjusts the stirring rotating speed wa and the stirring time tc of the mixing machine according to the Mb value, and after the mixing is finished, the central control unit controls the mixed materials to be conveyed to the screw extruder of the mixing machine;
and 7: the central control unit adjusts the rotating speed wb and the discharging temperature Tc of a screw in the screw extruder according to the Mb value, and the screw extruder outputs materials to a film making machine during operation so as to prepare a bio-based wheat straw polypropylene composite material film;
the central control unit is internally provided with a straw preset quality matrix Ma0 and a preset pretreatment matrix group A; for straw preset mass matrixes Ma0 and Ma0(Ma1, Ma2, Ma3 and Ma4), wherein Ma1 is a first preset mass of straw, Ma2 is a second preset mass of straw, Ma3 is a third preset mass of straw, Ma4 is a fourth preset mass of straw, and the mass values of the preset masses are gradually increased in sequence; for a preset pretreatment matrix group A, A (Ta0, Ta0, Tb0, Tb0 and D0), wherein Ta0 is a NaOH solution preset temperature matrix, Ta0 is a preset soaking time matrix, Tb0 is a preset standing temperature matrix, Tb0 is a preset standing time matrix, and D0 is a preset humidity matrix;
for NaOH solution preset temperature matrixes Ta0, Ta0(Ta1, Ta2, Ta3, Ta4), wherein Ta1 is a first NaOH solution preset temperature, Ta2 is a second NaOH solution preset temperature, Ta3 is a third NaOH solution preset temperature, Ta4 is a fourth NaOH solution preset temperature, and numerical values of the preset temperatures are gradually increased in sequence;
for the preset soaking time matrixes ta0, ta0(ta1, ta2, ta3, ta4), wherein ta1 is a first preset soaking time, ta2 is a second preset soaking time, ta3 is a third preset soaking time, ta4 is a fourth preset soaking time, and the numerical values of the preset soaking times are gradually increased in sequence;
for the preset standing temperature matrixes Tb0, Tb0(Tb1, Tb2, Tb3, Tb4), where Tb1 is a first preset standing temperature, Tb2 is a second preset standing temperature, Tb3 is a third preset standing temperature, Tb4 is a fourth preset standing temperature, and the values of the preset standing temperatures are gradually increased in sequence;
for the preset standing time matrixes tb0 and tb0(tb1, tb2, tb3 and tb4), wherein tb1 is a first preset standing time, tb2 is a second preset standing time, tb3 is a third preset standing time, tb4 is a fourth preset standing time, and the numerical values of the preset standing times are gradually increased in sequence;
for the preset humidity matrixes D0, D0(D1, D2, D3, D4), wherein D1 is a first preset humidity, D2 is a second preset humidity, D3 is a third preset humidity, and D4 is a fourth preset humidity, the numerical values of the preset humidities are gradually increased in sequence;
before conveying cleaned straws to a pulverizer, weighing the straws to obtain the mass Ma of the straws, and comparing the Ma with each preset mass value in a Ma0 matrix by a central control unit:
when Ma is not more than Ma1, the central control unit sequentially selects Ta1 from a Ta0 matrix, Ta1 from a Ta0 matrix, Tb1 from a Tb0 matrix, Tb1 from a Tb0 matrix and D1 from a D0 matrix, and establishes a predetermined case matrix R1(Ta1, Ta1, Tb1, Tb1 and D1);
when Ma1 is more than or equal to Ma2, the central control unit selects Ta2 from a Ta0 matrix, selects Ta2 from a Ta0 matrix, selects Tb2 from a Tb0 matrix, selects Tb2 from a Tb0 matrix and selects D2 from a D0 matrix in sequence to establish a plan matrix R2(Ta2, Ta2, Tb2, Tb2 and D2);
when Ma2 is more than or equal to Ma3, the central control unit selects Ta3 from a Ta0 matrix, selects Ta3 from a Ta0 matrix, selects Tb3 from a Tb0 matrix, selects Tb3 from a Tb0 matrix and selects D3 from a D0 matrix in sequence to establish a plan matrix R3(Ta3, Ta3, Tb3, Tb3 and D3);
when Ma3 is more than or equal to Ma4, the central control unit selects Ta4 from a Ta0 matrix, selects Ta4 from a Ta0 matrix, selects Tb4 from a Tb0 matrix, selects Tb4 from a Tb0 matrix and selects D4 from a D0 matrix in sequence to establish a plan matrix R4(Ta4, Ta4, Tb4, Tb4 and D4);
when the central control unit establishes a predetermined matrix Ri (Tai, Tai, Tbi, Tbi, Di), i is 1, 2, 3, 4, the central control unit sets the preset heating temperature of NaOH solution in the neutralization cleaning pool to Tai, sets the preset soaking time of straw particles in the NaOH solution in the neutralization cleaning pool to Tai, adjusts the preset net value temperature of the hydrothermal reaction kettle to Tbi, sets the preset standing time of the straw particles in the hydrothermal reaction kettle to Tbi, and sets the preset humidity in the vacuum drying box to Di.
2. The process for preparing the bio-based wheat straw polypropylene composite film according to claim 1, wherein the central control unit is further provided with a straw particle set mass matrix Mb0, a preset material matrix group Q0 and a preset mixing matrix group H0; the straw particle preset mass matrixes Mb0 and Mb0(Mb1, Mb2, Mb3 and Mb4), wherein Mb1 is the first preset mass of the straw particles, Mb2 is the second preset mass of the straw particles, Mb3 is the third preset mass of the straw particles, Mb4 is the fourth preset mass of the straw particles, and the mass values of the preset masses are gradually increased in sequence;
the preset material matrix group Q0(Qpp0, Qpe0, Qz0, Qx0), wherein Qpp0 is a PP material tank preset charging matrix, Qpe0 is a PE material tank preset charging matrix, Qz0 is a toughening agent tank preset charging matrix, and Qx0 is a compatilizer tank preset charging matrix; presetting a charging matrix Qpp0, Qpp0(Qpp1, Qpp2, Qpp3 and Qpp4) for a PP material tank, wherein Qpp1 is a first preset charging amount of the PP material tank, Qpp2 is a second preset charging amount of the PP material tank, Qpp3 is a third preset charging amount of the PP material tank, Qpp4 is a fourth preset charging amount of the PP material tank, and the mass of each preset charging amount is gradually increased in sequence;
presetting feeding matrixes Qpe0 and Qpe0(Qpe1, Qpe2, Qpe3 and Qpe4) for the PE material tank, wherein Qpe1 is a first preset feeding amount of the PE material tank, Qpe2 is a second preset feeding amount Qpe3 of the PE material tank, a third preset feeding amount Qpe4 of the PE material tank is a fourth preset feeding amount of the PE material tank, and the mass of each preset feeding amount is gradually increased in sequence;
presetting a charging matrix Qz0 and Qz0(Qz1, Qz2, Qz3 and Qz4) for the toughening agent tank, wherein Qz1 is a first preset charging amount of the toughening agent tank, Qz2 is a second preset charging amount of the toughening agent tank, Qz3 is a third preset charging amount of the toughening agent tank, Qz4 is a fourth preset charging amount of the toughening agent tank, and the mass of each preset charging amount is gradually increased in sequence;
presetting a charging matrix Qx0 and Qx0(Qx1, Qx2, Qx3 and Qx4) for the compatilizer tank, wherein Qx1 is a first preset charging amount of the compatilizer tank, Qx2 is a second preset charging amount of the compatilizer tank, Qx3 is a third preset charging amount of the compatilizer tank, Qx4 is a fourth preset charging amount of the compatilizer tank, and the mass of each preset charging amount is gradually increased in sequence;
the preset mixing matrix groups H0 and H0(wa0, Tc0, wb0 and Tc0), wherein wa0 is a preset rotating speed matrix of the stirrer, Tc0 is a preset stirring time matrix of the stirrer, wb0 is a preset rotating speed matrix of the screw extruder, and Tc0 is a preset discharging temperature matrix of the screw extruder;
for the preset rotation speed matrixes wa0 and wa0(wa1, wa2, wa3 and wa4) of the stirrer, wherein wa1 is the first preset rotation speed of the stirrer, wa2 is the second preset rotation speed of the stirrer, wa3 is the third preset rotation speed of the stirrer, wa4 is the fourth preset rotation speed of the stirrer, and the numerical values of the rotation speeds are gradually increased in sequence;
presetting a stirring time matrix tc0 and tc0(tc1, tc2, tc3 and tc4) for the stirrer, wherein tc1 is a first preset stirring time of the stirrer, tc2 is a second preset stirring time of the stirrer, tc3 is a third preset stirring time of the stirrer, tc4 is a fourth preset stirring time of the stirrer, and the rotating speed values are gradually increased in sequence;
for a screw extruder preset rotation speed matrix wb0, wb0(wb1, wb2, wb3, wb4), wherein wb1 is a first preset rotation speed of the screw extruder, wb2 is a second preset rotation speed of the screw extruder, wb3 is a third preset rotation speed of the screw extruder, wb4 is a fourth preset rotation speed of the screw extruder, and the numerical values of the rotation speeds are gradually increased in sequence;
for a screw extruder preset discharge temperature matrix Tc0, Tc0(Tc1, Tc2, Tc3, Tc4), wherein Tc1 is a first preset discharge temperature of the screw extruder, Tc2 is a second preset discharge temperature of the screw extruder, Tc3 is a third preset discharge temperature of the screw extruder, Tc4 is a fourth preset discharge temperature of the screw extruder, and the temperature values are gradually increased in sequence;
when the straw particles enter the stirrer, the weigher can detect the mass Mb of the straw particles, and the central control unit compares the Mb with each preset mass value in an Mb0 matrix:
when Mb is less than or equal to Mb1, the central control unit sequentially selects Qpp1 from a Qpp0 matrix, Qpe1 from a Qpe0 matrix, Qz1 from a Qz0 matrix, Qx1 from a Qx0 matrix, wa1 from a wa0 matrix, Tc1 from a Tc0 matrix, wb1 from a wb0 matrix, and Tc1 from a Tc0 matrix, and establishes a mixed plan matrix S1(Qpp1, Qpe1, Qz1, Qx1, wa1, Tc1, wb1, Tc 1);
when Mb1 is more than Mb and less than or equal to Mb2, the central control unit sequentially selects Qpp2 from a Qpp0 matrix, Qpe2 from a Qpe0 matrix, Qz2 from a Qz0 matrix, Qx2 from a Qx0 matrix, wa2 from a wa0 matrix, Tc2 from a Tc0 matrix, wb2 from a wb0 matrix, Tc2 from a Tc0 matrix, and establishes a mixed plan matrix S2(Qpp2, Qpe2, Qz2, Qx2, wa2, Tc2, wb2 and Tc 2);
when Mb2 is more than Mb and less than or equal to Mb3, the central control unit sequentially selects Qpp3 from a Qpp0 matrix, Qpe3 from a Qpe0 matrix, Qz3 from a Qz0 matrix, Qx3 from a Qx0 matrix, wa3 from a wa0 matrix, Tc3 from a Tc0 matrix, wb3 from a wb0 matrix, Tc3 from a Tc0 matrix, and establishes a mixed plan matrix S3(Qpp3, Qpe3, Qz3, Qx3, wa3, Tc3, wb3 and Tc 3);
when Mb3 is more than Mb and less than or equal to Mb4, the central control unit sequentially selects Qpp4 from a Qpp0 matrix, Qpe4 from a Qpe0 matrix, Qz4 from a Qz0 matrix, Qx4 from a Qx0 matrix, wa4 from a wa0 matrix, Tc4 from a Tc0 matrix, wb4 from a wb0 matrix, Tc4 from a Tc0 matrix, and establishes a mixed plan matrix S4(Qpp4, Qpe4, Qz4, Qx4, wa4, Tc4, wb4 and Tc 4);
when the central control unit establishes a mixing plan matrix Sj (Qppj, Qpej, Qzj, Qxj, waj, tcj, wbj and Tcj), j is 1, 2, 3 and 4, the preset charging amount of a PP material tank of the central control unit is adjusted to Qppj, the preset charging amount of a PE material tank is adjusted to Qpej, the preset charging amount of a toughening agent tank is adjusted to Qzj, the preset charging amount of a compatilizer tank is adjusted to Qxj, the preset rotating speed of a stirrer is adjusted to waj, the preset stirring time of the stirrer is adjusted to tcj, the preset rotating speed of a screw extruder is adjusted to wbj, and the preset discharging temperature of the screw extruder is adjusted to Tcj.
3. The process for preparing the bio-based wheat straw polypropylene composite film according to claim 2, wherein the toughening agent is one or more of ethylene-octene copolymer, ethylene-vinyl acetate copolymer and ethylene-butene copolymer.
4. The process for preparing the bio-based wheat straw polypropylene composite film according to claim 2, wherein the compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted polypropylene wax.
5. The process for preparing the bio-based wheat straw polypropylene composite film according to claim 2, wherein the neutralizing solution is an acetic acid solution.
6. The process for preparing the bio-based wheat straw polypropylene composite film according to claim 2, wherein the mixer is a high-speed mixer.
7. The process for preparing the bio-based wheat straw polypropylene composite film according to claim 2, wherein the screw extruder adopts twin screws.
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