CN111849137A - Protective material and application thereof, sand prevention net and preparation method thereof and sand prevention device - Google Patents
Protective material and application thereof, sand prevention net and preparation method thereof and sand prevention device Download PDFInfo
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- CN111849137A CN111849137A CN202010743022.2A CN202010743022A CN111849137A CN 111849137 A CN111849137 A CN 111849137A CN 202010743022 A CN202010743022 A CN 202010743022A CN 111849137 A CN111849137 A CN 111849137A
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- sand control
- polylactic acid
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Images
Classifications
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- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
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- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
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- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
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- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
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- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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Abstract
The invention provides a protective material and application thereof, a sand prevention net and a preparation method thereof, and a sand prevention device, and relates to the technical field of sand prevention and control. The protective material comprises the following components in percentage by weight: 85-98% of first polylactic acid resin and 2-15% of anti-aging concentrated master batch; wherein, the anti-aging concentrated master batch comprises: a second polylactic acid resin, an antioxidant and an optional auxiliary agent. The sand control net can be completely degraded within a certain time, and has good sand control and prevention effects.
Description
Technical Field
The invention relates to the technical field of sand prevention and control, in particular to a protective material and application thereof, a sand prevention net and a preparation method thereof and a sand prevention device.
Background
Land desertification and desertification are one of the most serious ecological problems faced by China at present, with the needs of economic development, resource development and military industry, railways, highways, mines, satellite launching sites and various living buildings and facilities need to be built in deserts, and stormy sandstorm can bury the railways, the highways and the buildings if the sandstorm is not blocked and fixed, thus seriously affecting the production and life safety.
In the prior art, the adopted sand prevention and fixation products comprise grass squares and plastic nets. The grass square is successfully used on the Baolan railway, but due to the problems of raw materials, transportation, construction, service life and the like, the use cost is high, standardized production and installation cannot be realized, and the situation is difficult to continue. The existing 'warp knitted net' and 'sunshade net' made of plastic materials are also used as substitute products of 'grass square grids' for blocking and fixing sand, but the existing plastic nets have the serious defects of nondegradable property, environmental pollution and the like, and are easy to cause secondary pollution in desert areas.
Therefore, research and development of a degradable sand control net and application of the degradable sand control net in the field of desert control or sand control become problems to be solved urgently.
Disclosure of Invention
The invention aims to provide a protective material, application thereof, a sand-proof net, a preparation method thereof and a sand-proof device, which can be completely degraded in a certain time, have good sand-proof and sand-proof effects and can overcome the problems or at least partially solve the technical problems.
According to one aspect of the application, the application provides a protective material, which comprises the following components in percentage by weight:
85-98% of first polylactic acid resin and 2-15% of anti-aging concentrated master batch;
wherein, the anti-aging concentrated master batch comprises: a second polylactic acid resin, an antioxidant and an optional auxiliary agent.
In one possible implementation manner, the protective material comprises the following components in percentage by weight: 85-95% of first polylactic acid resin and 5-15% of anti-aging concentrated master batch;
preferably, the protective material comprises the following components in percentage by weight: 90-93% of first polylactic acid resin and 7-10% of anti-aging concentrated master batch.
In one possible implementation mode, the anti-aging concentrated master batch comprises the following components in parts by weight: 65-90 parts of second polylactic acid resin, 5-40 parts of antioxidant and 0-10 parts of auxiliary agent;
preferably, the anti-aging concentrated master batch comprises the following components in parts by weight: 74-86 parts of second polylactic acid resin, 6-30 parts of antioxidant and 1-5 parts of auxiliary agent.
In one possible implementation, the first polylactic acid-based resin includes a polylactic acid resin, a modified polylactic acid resin, or a composite material including a polylactic acid resin;
the second polylactic acid resin comprises a polylactic acid resin, a modified polylactic acid resin or a composite material containing a polylactic acid resin;
preferably, the first polylactic acid-based resin and the second polylactic acid-based resin are the same or different.
In one possible implementation, the antioxidant is one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), 2, 6-di-tert-4-methylphenol (antioxidant 264), dilauryl thiodipropionate (DLTP) or distearyl thiodipropionate (DSTP), tris [2, 4-di-tert-butylphenyl ] phosphite (antioxidant 168);
and/or the auxiliary agent comprises one or more compositions of a coloring agent, a brightening agent or silicone oil.
According to another aspect of the application, the application provides an application of the protective material in the fields of wind prevention and sand control, sand prevention and fixation or improvement of sandy vegetation growth.
According to another aspect of the present application, there is provided a sand control mesh woven from a monofilament material comprising a protective material as described above.
In one possible implementation, the monofilament material has a diameter of 0.15-0.4 mm.
In one possible implementation mode, the sand control net has one or more opening rates, and the net surface of the sand control net is in a regular mesh structure;
preferably, the sand control net has a plurality of opening rates, the sand control net comprises an upper sand control net and a lower sand control net, the opening rate of the upper sand control net is 60% -70%, and the opening rate of the lower sand control net is 45% -65%;
preferably, the sand control net has an opening ratio of 40% to 70%.
In one possible implementation, the woven structure of the sand control net is a plain weave, a honeycomb weave or a combination of the plain weave and the honeycomb weave.
In a possible implementation manner, the sand-proof net includes an upper sand-proof net and a lower sand-proof net, the upper sand-proof net is a honeycomb weave, and the lower sand-proof net is a plain weave.
In a possible implementation manner, the sand-proof net includes an upper sand-proof net and a lower sand-proof net, the upper sand-proof net is a plain weave, and the lower sand-proof net is a honeycomb weave.
According to another aspect of the present application, there is provided a method for preparing a sand control net, the sand control net being the sand control net described above, the method comprising:
mixing the second polylactic acid resin, the antioxidant and optional auxiliary agents, and preparing into anti-aging concentrated master batches;
mixing the anti-aging concentrated master batch and the first polylactic acid resin in proportion to prepare monofilaments;
and weaving the monofilaments into the sand control net.
In one possible implementation, the preparation method comprises the following steps:
(1) mixing, stirring, melt-extruding and granulating the second polylactic acid resin, the antioxidant and the optional auxiliary agent according to a proportion to prepare an anti-aging concentrated master batch;
(2) sequentially baking, mixing, stirring and drying the anti-aging concentrated master batch prepared in the step (1) and the first polylactic acid resin;
(3) melting and extruding the dried material obtained in the step (2) by an extruder, cooling, drafting, shaping and rolling to prepare monofilaments;
(4) and (4) weaving the monofilaments obtained in the step (3) into the sand-proof net with a certain opening rate by a weaving machine.
Further, in the step (1), the temperature of the melt extrusion is 170-190 ℃.
Further, in the step (2), the drying device of the material is a vacuumized rotating cage drying box, the drying temperature is 90-110 ℃, and the drying time is more than 6 hours.
Further, in the step (3), the material melt extrusion temperature is 160-230 ℃, and the extrusion pressure is 0.2-1 Kpa; the drafting temperature is 55-75 ℃, and the drafting multiple is 2.5-4.0 times; the setting temperature is 55-75 ℃.
According to another aspect of the present application, there is provided a sand control device comprising a sand control net as described above and a sand control net securing mechanism.
Furthermore, the sand control device can be installed by fixing the sand control net on the upright post to form a square, rectangular or other polygonal shape to form the sand control grid sand barrier, or to form the sand control grid sand barrier with two sides extending continuously.
Compared with the prior art, the technical scheme provided by the invention can achieve the following beneficial effects:
the protective material and the sand control net containing the protective material provided by the invention comprise a first polylactic acid resin and an anti-aging concentrated master batch, wherein the anti-aging concentrated master batch comprises a second polylactic acid resin, an antioxidant and an optional auxiliary agent. Therefore, the adopted polylactic acid resin is a degradable material, can be decomposed into carbon dioxide and water through the action of microorganisms in soil, does not generate toxic substances, does not cause pollution, and is an environment-friendly biological sand-proof material. Moreover, a certain amount of anti-aging concentrated master batch is added into the protective material, so that the degradation rate and the service life of the product can be effectively controlled, and the product is more economic and reasonable; after anti-aging treatment, the sand control net has more durable weather resistance.
Therefore, the protective material has the advantages of degradability, no pollution, safety, environmental protection, lasting weather resistance and controllable service life, and can be widely applied to the fields of wind prevention and sand control, sand prevention and fixation, improvement of vegetation growth of sandy soil and the like. The sand-proof net made of the protective material also has the advantages of the protective material.
The sand control device of the present invention has all the features and advantages of the protective material and the sand control net described above, and will not be described herein again.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a sand control net according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sand control net with different woven structures according to an embodiment of the present invention;
FIG. 2(a) shows a honeycomb structure in the upper section and a plain structure in the lower section; FIG. 2(b) shows a plain weave structure; FIG. 2(c) is a honeycomb structure;
fig. 3 is a schematic structural diagram of a sand control device (sand fixing net grid) according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a sand control device (sand barrier of sand blocking net) according to an embodiment of the present invention;
fig. 5 is a schematic view of another perspective structure of a sand control device (sand barrier net) according to an embodiment of the present invention.
Icon:
1-sand control net; 2-upright post; 3-soil; 4, locking and buckling; 5-diagonal draw bars; 6-a ground anchor;
101-upper section sand control net; 102-lower section sand screen.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it should be apparent that the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those skilled in the art without any creative effort based on the technical solutions and the given embodiments provided in the present application belong to the protection scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
It should be noted that the term "and/or"/"used herein is only one kind of association relationship describing associated objects, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, one or more new numerical ranges may be obtained by combining the individual values, or by combining the individual values.
All the technical features mentioned herein, as well as preferred features, may be combined with each other to form new solutions, if not mentioned specifically. Unless defined or indicated otherwise, technical and scientific terms used herein have the same meaning as is familiar to those skilled in the art.
The term "comprising", "made predominantly from … …" as used herein means that it may include, in addition to the recited components, other components which impart different properties to the protective material. In addition, the terms "comprising," "prepared primarily from … …," as used herein, can be replaced by the terms "comprising" or "prepared from … …," as used herein.
As understood by the technical personnel in the field, as for the background technology, most of the materials for preparing the plastic sand control net at present are non-degradable materials, so that the problem of secondary pollution to the environment exists, and grass squares and the like have the problems of poor weather resistance, short service life and the like. Therefore, in order to overcome the defects of the prior art and further meet the requirements of the current sand prevention and control field, the technical scheme of the embodiment of the invention provides a protective material and application thereof, a sand prevention net and a preparation method thereof and a sand prevention device, so as to relieve the problems of environmental pollution, poor weather resistance, short service life and the like of the existing sand prevention net.
In a first aspect, in some embodiments, there is provided a protective material comprising the following components in weight percent:
85-98% of first polylactic acid resin and 2-15% of anti-aging concentrated master batch;
wherein, the anti-aging concentrated master batch comprises: a second polylactic acid resin, an antioxidant and an optional auxiliary agent.
The protective material contains Polylactic Acid (PLA) resin material, the PLA resin is a novel bio-based and renewable biodegradable material, is generally prepared from starch raw materials provided by renewable plant resources (such as corn, cassava and the like), can be decomposed into carbon dioxide and water through the action of microorganisms in soil, does not generate toxic substances, does not cause pollution, and is an environment-friendly biological sand-preventing material. Meanwhile, a certain amount of anti-aging concentrated master batch is added into the protective material, so that the degradation rate and the service life of the product can be effectively controlled, and the product is more economic and reasonable; after anti-aging treatment, the sand control net has more durable weather resistance. Moreover, on the basis of the first polylactic acid resin and the anti-aging concentrated master batch with the content ranges, the preparation or construction performance is not affected by the mutual matching and supporting of the functions of the raw materials and the mutual restriction and matching of the proportions of the raw materials, so that the service life of the protective material is prolonged, and the weather resistance is improved.
Therefore, the protective material has the advantages of degradability, no pollution, safety, environmental protection, lasting weather resistance and controllable service life, and can be widely applied to the fields of wind prevention and sand control, sand prevention and fixation, improvement of vegetation growth of sandy soil and the like.
In the protective material, the optional auxiliary agent means that the auxiliary agent may or may not be provided in the anti-aging concentrated master batch. The first polylactic acid resin and the second polylactic acid resin may be the same polylactic acid resin material or different (similar in performance or structure, slightly different) polylactic acid resin materials.
Herein, percentages, ratios or parts referred to are by weight unless otherwise indicated. For example from 2 to 15%, and may be expressed as from 2 to 15% by weight. The term "part by weight" as used herein means the basic unit of measurement of the ratio of the components in weight, and 1 part may represent any unit weight, for example, 1kg or 5 kg. Furthermore, in some embodiments of the present invention, parts by weight may also be expressed in weight percent content or weight percent.
All percentages (including weight percentages) stated herein are based on the total mass of the composition, unless otherwise specified. That is, the percentages (%) both refer to weight percent relative to the composition.
The first polylactic acid resin is included in an amount of 85 to 98 wt%, typically, but not limited to, 85%, 86%, 88%, 89%, 90%, 92%, 93%, 94%, 95%, 96%, 98%, and any value within a range of any two of these values, based on the total weight of the barrier material (or monofilament). The anti-aging concentrated master batch is contained in an amount of 2 to 15% by weight, and typically, but not limited to, 2%, 3%, 4%, 5%, 6%, 8%, 10%, 12%, 13%, 14%, 15% by weight, or any value in a range of any two of these values.
In some embodiments, the protective material comprises the following components in percentage by weight: 85-95% of first polylactic acid resin and 5-15% of anti-aging concentrated master batch;
preferably, the protective material comprises the following components in percentage by weight: 90-93% of first polylactic acid resin and 7-10% of anti-aging concentrated master batch.
Through further adjustment and optimization of the weight percentages of the first polylactic acid resin and the anti-aging concentrated master batch, the synergistic cooperation effect among the components can be fully exerted, so that the first polylactic acid resin and the anti-aging concentrated master batch are efficiently matched, the material is more efficient and environment-friendly, can be completely degraded within a certain time, has a good sand prevention and prevention effect, and is favorable for improving the comprehensive performance of the material.
In some embodiments, the anti-aging concentrated masterbatch comprises the following components in parts by weight: 65-90 parts of second polylactic acid resin, 5-40 parts of antioxidant and 0-10 parts of other auxiliary agents.
The second polylactic acid resin is included in an amount of 65 parts by weight to 90 parts by weight, based on the total weight parts of the antioxidant concentrated mother particle, and may be, for example, typically, but not limited to, 65 parts by weight, 66 parts by weight, 68 parts by weight, 70 parts by weight, 72 parts by weight, 74 parts by weight, 75 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, 85 parts by weight, 88 parts by weight, 90 parts by weight, or any two of these values. The antioxidant is included in an amount of 5 parts to 40 parts by weight, and typically, but not limited to, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 38 parts, 40 parts, and any value in a range of any two of these points. The other additives are included in an amount of 0 to 10 parts by weight, and typically, but not limited to, for example, 0 part, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, and any value in the range of any two of these values.
In other embodiments, the components of the anti-aging concentrated masterbatch may be expressed by weight percentage.
Preferably, the anti-aging concentrated master batch comprises the following components in parts by weight: 74-86 parts of second polylactic acid resin, 6-30 parts of antioxidant and 1-5 parts of auxiliary agent.
Through the design of the content of the second polylactic acid resin, the antioxidant and the auxiliary agent and the further adjustment and optimization of the proportion of the second polylactic acid resin, the antioxidant and the auxiliary agent, the synergistic cooperation effect among all the components can be fully exerted, so that the second polylactic acid resin, the antioxidant and the auxiliary agent are efficiently matched, the service life of the protective material can be effectively regulated and controlled, the product is more economic and reasonable, and the weather resistance is more durable.
In some embodiments, the first polylactic acid resin and the second polylactic acid resin may be the same PLA resin material, or may be PLA resin materials having similar properties or structures but slightly different (e.g., different molecular weights).
Specifically, the first polylactic acid-based resin includes a polylactic acid (PLA) resin, a modified polylactic acid resin, or a composite material including a polylactic acid resin;
the second polylactic acid based resin includes a polylactic acid (PLA) resin, a modified polylactic acid resin, or a composite material including the polylactic acid resin.
It is understood that the polylactic acid based resin may be a degradable polylactic acid based material, which may be a conventional PLA resin, or a modified PLA resin, and the modified PLA resin still has degradable properties, or a composite material including PLA, for example, a composite material including PLA and glycolic acid, and the composite material including PLA still has degradable properties.
It should be noted that, the embodiment of the present invention does not limit the specific modification method or the modified structure of the modified PLA resin, and any modification method can be adopted as long as the modified PLA resin still has degradable performance, and the object of the present invention is not limited. Also, the specific composition of the composite material comprising the PLA resin is not limited in the examples of the present invention, as long as the composite material has degradable property, and the object of the present invention is not limited.
The specific type of antioxidant can be varied to meet the requirements of degradation rate and service life of the protective material. Specifically, in some embodiments, the antioxidant includes, but is not limited to, one or more of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010), 2, 6-di-tert-4-methylphenol (antioxidant 264), dilauryl thiodipropionate (DLTP) or distearyl thiodipropionate (DSTP), tris [2, 4-di-tert-butylphenyl ] phosphite (antioxidant 168). For example, the antioxidant may be antioxidant 1010, antioxidant 264, DLTP, DSTP, antioxidant 168, a mixture of antioxidant 1010 and antioxidant 264, a mixture of antioxidant 264, DLTP and DSTP, a mixture of antioxidant 1010, antioxidant 168 and DLTP, or the like.
In addition, the specific type of the antioxidant is not limited to the above-listed types, and other types of the antioxidant, such as the antioxidant 626, can be adopted to meet the requirements of degradation rate and service life of the protective material, and are not described in detail herein.
In some embodiments, the adjuvant includes, but is not limited to, one or more compositions of a colorant, a brightener, or a silicone oil. For example, the auxiliary may be a colorant, may be a brightener, may be a silicone oil, may be a mixture of a colorant and a brightener, may be a mixture of a colorant, a brightener, and a silicone oil, and the like.
As can be seen from the above description, in the above protective material, the PLA resin material is a degradable material, which can be decomposed into carbon dioxide and water, so as to avoid secondary pollution, however, the strength of the material will decrease rapidly during use, which affects the service life, so that it is necessary to add antioxidant concentrated masterbatch into the protective material, and by adding degradation inhibitor such as antioxidant into the components, the weather resistance is more durable, which can effectively improve the service life of PLA, so that the service life of the protective material can be controlled. In addition, in practical application, the influence effect of the degradation inhibitor on the service life of the PLA can be conjectured through the correlation between laboratory aging test data and desert field test data, so that the service life of the PLA sand control net can be adjusted and controlled.
In a second aspect, there is provided in some embodiments the use of a protective material as described above in the fields of wind control, sand prevention and fixation or improvement of sandy soil vegetation growth.
The protective material has the advantages of degradability, capability of avoiding secondary environmental pollution, relatively lasting weather resistance, controllable degradation rate and service life and the like, so that the protective material can be widely applied to the fields of wind prevention and sand control, sand prevention and sand fixation or improvement of sandy soil vegetation growth and the like in a desert environment.
In a third aspect, as shown in fig. 1 to 5, the present application provides a sand control net, wherein the sand control net 1 is woven by using monofilament material, and the monofilament material comprises the protective material as described above.
The monofilament in the sand-proof net is made of the protective material, so that the sand-proof net has degradable performance, does not cause pollution, is safe and environment-friendly, has lasting weather resistance and controllable service life, and can be widely applied to the fields of wind prevention and sand control, sand prevention and fixation, improvement of vegetation growth of sandy soil and the like.
Further, in some embodiments, the sand control net is a biodegradable sand control net woven from PLA monofilaments and having regular pores. The monofilament comprises the following components and contents (based on the total weight of the monofilament):
85-98% of PLA resin;
2-15% of anti-aging concentrated master batch;
the anti-aging concentrated master batch comprises the following components and contents (based on the total weight of the master batch):
65-90 parts of PLA resin;
5-40 parts of an antioxidant;
0-10 parts of other auxiliary agents.
The diameter of the monofilament material is 0.15-0.4 mm.
In some embodiments, the sand control net has one or more opening rates, and the net surface of the sand control net is in a regular mesh structure; for example, the mesh structure may be rectangular, square, diamond or other shapes, and the specific pore or mesh structure is not limited in the embodiments of the present invention.
Specifically, in some embodiments, as shown in fig. 1 and 2, the sand control net 1 has a plurality of opening ratios, the sand control net 1 includes an upper sand control net 101 and a lower sand control net 102, the opening ratio of the upper sand control net 101 is 60% to 70%, such as 60%, 62%, 64%, 65%, 66%, 68%, 70%, etc., and the opening ratio of the lower sand control net 102 is 45% to 65%, such as 45%, 48%, 50%, 52%, 55%, 58%, 60%, 65%, etc.
When the opening rate of the biodegradable sand control net is inconsistent, the opening rate of the upper section of net is greater than that of the lower section of net. Therefore, the opening rate of the upper section net is large, the resistance is small, the opening rate of the lower section net is small, the resistance is large, the structure can reduce the effect of erosion of wind sand to the underground, and therefore wind erosion is reduced or avoided.
Specifically, in other embodiments, the sand control mesh has an opening ratio of 40% to 70%, such as 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc.
Corresponding to different application scenes or different requirements, the opening ratio of the sand control net can be set into various forms, for example, the opening ratio of the whole sand control net can be consistent, so that the processing and the manufacturing are convenient; or the opening rates of the upper section and the lower section of the sand control net are not consistent, particularly, the opening rate of the upper section of the sand control net is larger than the opening rate of the lower section of the sand control net, and the resistance of the upper section net is smaller than that of the lower section net, so that the effect of reducing erosion of wind sand to the underground can be achieved, and the effect of reducing or avoiding wind erosion is further achieved.
In some embodiments, the woven structure of the sand control mesh is a plain weave, a honeycomb weave, or a combination of plain and honeycomb weaves.
In some embodiments, when the opening ratios of the sand screens are not uniform, the sand screen 1 includes an upper sand screen 101 and a lower sand screen 102, the upper sand screen 101 adopts a honeycomb structure, and the lower sand screen 102 adopts a plain structure.
In other embodiments, when the opening ratios of the sand screens are not uniform, the sand screen 1 comprises an upper sand screen 101 and a lower sand screen 102, wherein the upper sand screen 101 adopts a plain weave, and the lower sand screen 102 adopts a honeycomb weave.
The specific resulting shape of the sand screen may also have various forms, corresponding to different application scenarios or different requirements. For example, the weaving structure of the entire sand control net may be a plain weave, or the weaving structure of the entire sand control net may be a honeycomb weave, or the weaving structure of the sand control net may include both the plain weave and the honeycomb weave, and the specific arrangement positions of the plain weave and the honeycomb weave may be selected and set according to the actual situation, which is not limited in the embodiment of the present invention.
In a fourth aspect, there is provided in some embodiments a method of making a sand control net, the sand control net being as described above, the method comprising:
mixing the second polylactic acid resin, the antioxidant and optional auxiliary agents, and preparing into anti-aging concentrated master batches;
mixing the anti-aging concentrated master batch and the first polylactic acid resin in proportion to prepare monofilaments;
and weaving the monofilaments into the sand control net.
Therefore, the method is simple to operate, easy to realize and easy to realize expanded production.
Specifically, in some embodiments, the preparation method comprises the steps of:
(1) mixing, stirring, melt-extruding and granulating the second polylactic acid resin, the antioxidant and the optional auxiliary agent according to a proportion to prepare an anti-aging concentrated master batch;
(2) sequentially baking, mixing, stirring and drying the anti-aging concentrated master batch prepared in the step (1) and the first polylactic acid resin;
(3) melting and extruding the dried material obtained in the step (2) by an extruder, cooling, drafting, shaping and rolling to prepare monofilaments;
(4) and (4) weaving the monofilaments obtained in the step (3) into the sand-proof net with a certain opening rate by a weaving machine.
Further, in the step (1), the temperature of the melt extrusion is 170-190 ℃.
Further, in the step (2), the drying device of the material is a vacuumized rotating cage drying box, the drying temperature is 90-110 ℃, and the drying time is more than 6 hours.
Further, in the step (3), the material melt extrusion temperature is 160-230 ℃, and the extrusion pressure is 0.2-1 Kpa; the drafting temperature is 55-75 ℃, and the drafting multiple is 2.5-4.0 times; the setting temperature is 55-75 ℃.
In a fifth aspect, as shown in figures 3 to 5, there is provided in some embodiments a sand control device comprising a sand control net 1 as described above and a sand control net securing mechanism; the sand-proof net fixing mechanism comprises a vertical column 2, a lock catch 4, a diagonal draw bar 5 and a ground anchor 6.
Further, the sand control device may be installed by fixing the sand control net 1 to the vertical column 2 to form a square, rectangular or other polygonal shape to form a sand control grid sand barrier, or to form a sand control grid sand barrier with two sides extending continuously.
Specifically, as shown in fig. 4 and 5, the sand control net 1 may be fixed to the columns 2 and inserted into the soil 3, and may be fixed using the latches 4, the diagonal braces 5, the ground anchors 6, and the like.
It should be understood that the method for manufacturing the fourth aspect and the sand control device of the fifth aspect are based on the same inventive concept as the aforementioned protective material and sand control net, and the same or similar parts as the aforementioned protective material and sand control net, or the advantages achieved thereby, can be referred to the aforementioned explanations for the protective material and sand control net, and will not be described herein again.
As can be seen from the above description, the protective material and the sand-proof net provided by the embodiment of the present invention mainly have the following advantages:
(1) degradable performance: degradable polylactic acid (PLA) monofilaments are used as main materials to weave a sand control net with regular pores, and can be decomposed into carbon dioxide and water under the action of microorganisms in soil; no toxic substances are generated, no pollution is caused, and the material is an environment-friendly biological sand-proof material.
(2) Wind-reducing sand-blocking performance: wind tunnel simulation experiments show that the flow field characteristics of the product are basically the same as those of the grass square sand barrier; when the sand conveying device is used in a desert area in a connected mode, the roughness of a sand surface can be obviously increased, the wind speed of the surface of quicksand is reduced, the sand conveying strength is weakened, a stable concave curved surface is formed, and the protection range is large.
(3) Wind erosion resistance: by adopting a unique upper-sparse lower-dense structure, the structure can guide the more sparse mesh surface of the wind-direction sand barrier to pass through, the excavation and corrosion effects of the wind-direction underground are obviously weakened, and the product has the comprehensive effects of reducing wind, blocking sand and guiding wind.
(4) Weather resistance of the product: the sand control net has more durable weather resistance after anti-aging treatment.
(5) Life controllability: by reasonably controlling the addition of the anti-aging master batch, the degradation rate and the service life of the product can be effectively controlled, so that the product is more economic and reasonable.
(6) The product combination is flexible: the product and the matched stand column can be flexibly applied according to the site conditions of a treatment area, and can be combined into various square grid configuration modes of 1.0 multiplied by 1.0m, 1.2 multiplied by 1.2m, 1.5 multiplied by 1.5m, 2.0 multiplied by 2.0m and the like;
(7) the product safety performance is as follows: because PLA is a plant-based material and has biocompatibility, even if animals eat the product by mistake, the PLA can not cause any influence on the animal and has no toxic or side effect.
In order to facilitate an understanding of the invention, the invention will now be further described with reference to the following specific examples. In the following specific examples, materials used are commercially available unless otherwise specified.
Example 1
A biodegradable sand-proof net has an upper section of net made of honeycomb structure and with an opening rate of 65% and a lower section of net made of plain structure and with an opening rate of 60%.
Mixing 65 parts by weight of PLA, 20 parts by weight of antioxidant 1010, 5 parts by weight of DLTP, 5 parts by weight of colorant and brightener in proportion to prepare an anti-aging concentrated master batch, and mixing 2% of the anti-aging concentrated master batch and 98% of PLA to prepare the PLA monofilament.
Example 2
A biodegradable sand-proof net has an upper section of net made of honeycomb structure and with an opening rate of 70% and a lower section of net made of plain structure and with an opening rate of 65%.
Mixing 86 parts of PLA, 5 parts of antioxidant 1010, 5 parts of antioxidant 264 and 4% of colorant according to the weight part to prepare anti-aging concentrated master batches, and mixing 10% of anti-aging concentrated master batches and 90% of PLA to prepare the PLA monofilament.
Example 3
A biodegradable sand-proof net adopts plain weave, and the opening rate is 65%.
74 parts of PLA, 15 parts of antioxidant 264, 6 parts of antioxidant DSTP, 3 parts of colorant and 2 parts of silicone oil are mixed according to a proportion to prepare anti-aging concentrated master batches, and 15 percent of the anti-aging concentrated master batches and 85 percent of PLA are mixed to prepare the PLA monofilament.
Example 4
A biodegradable sand-proof net is made up of plain weave with opening rate of 40%.
Mixing 90 parts by weight of PLA, 5 parts by weight of antioxidant 264 and 5 parts by weight of antioxidant 168 according to a proportion to prepare an anti-aging concentrated master batch, and mixing 7% of the anti-aging concentrated master batch with 93% of the PLA to prepare the PLA monofilament.
The above examples 1 to 4 were subjected to a laboratory accelerated aging test to test the warp-direction strength (plain weave, N/5cm) of the sand control net of each example and the sand control net strength retention (%) of each example, respectively. The test results are shown in tables 1 and 2, respectively.
TABLE 1 Sand control Net Strength (N/5cm) vs. Experimental time
| Time of day | Initial | 240h | 480h | 720h | 960h |
| Example 1 | 387.84 | 371.78 | 318.77 | 214.71 | 89.78 |
| Example 2 | 416.53 | 396.37 | 346.93 | 217.93 | 88.10 |
| Example 3 | 482.14 | 456.06 | 405.77 | 270.14 | 117.26 |
| Example 4 | 395.81 | 380.10 | 321.71 | 223.32 | 95.19 |
TABLE 2 Sand control Net Strength Retention (%) vs. Experimental time relationship
| Time of day | Initial | 240h | 480h | 720h | 960h |
| Example 1 | 100％ | 95.86％ | 82.19％ | 55.36％ | 23.15％ |
| Example 2 | 100％ | 95.16％ | 83.29％ | 52.32％ | 21.15％ |
| Example 3 | 100％ | 94.59％ | 84.16％ | 56.03％ | 24.32％ |
| Example 4 | 100％ | 96.03％ | 81.28％ | 56.42％ | 24.05％ |
Note: the strength of the sand control net in Table 1 is the strength of the sand control net in the plain weave structure, and is in the unit of N/5 cm. The retention rate of the strength of the sand screen in table 2 is the retention rate of the strength of the sand screen in the plain weave structure in units of%.
The antioxidants in the above examples were expressed in weight percent, respectively, with the antioxidant content in example 1 being 0.50%, the antioxidant content in example 2 being 1.0%, the antioxidant content in example 3 being 3.15%, and the antioxidant content in example 4 being 0.70%.
As is apparent from tables 1 to 2, the strength of the PLA sand control net is greatly affected by the content of the antioxidant, and in the above range, the greater the content of the antioxidant, the greater the strength, the longer the period of time in which the net can be used in a desert.
Taking the sand control net obtained in example 1 as an example, the sand control net obtained in example 1 was subjected to a laboratory aging test and a desert field test (the test site is maqu county, kansu province), and the results of the laboratory aging test and the desert field test were compared with each other, and the comparison results are shown in table 3.
Table 3 comparison of laboratory aging experiments and field desert experiments for sand control nets of example 1
As can be seen from the data in table 3, when the sand control net of example 1 is installed in mastic (desert), the strength retention rate is 89.35% after 360 days, the strength retention rate is 79.64% after 550 days, the test data of 550 days is closer to the test data after 480 hours of the laboratory accelerated aging test, and the actual service time of the sand control net can be estimated through the test data and the field test data of desert.
If the use time in the desert needs to be prolonged, the content of the antioxidant and the content of the anti-aging master batches can be properly increased, so that the service life of the PLA sand control net is prolonged.
Taking the sand control net obtained in example 1 as an example, the warp strength of the plain weave, the warp elongation of the plain weave, the warp strength of the honeycomb weave (honeycomb weave), the warp elongation of the honeycomb weave (honeycomb weave), the weft strength of the sand control net, and the weft elongation of the sand control net obtained in example 1 were tested, and the test results are shown in table 4.
Table 4 sand control net strength, elongation test results of example 1
As can be seen from the data in table 4, the sandproof net has different weave structures or different opening ratios, and the warp direction strength and the warp direction elongation of the obtained sandproof net are slightly different, and in practical applications, an appropriate weave structure, such as a plain weave structure or a honeycomb weave structure, can be selected according to practical situations to meet different requirements.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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.
It is noted that a portion of this patent application contains material which is subject to copyright protection. The copyright owner reserves the copyright rights whatsoever, except for making copies of the patent files or recorded patent document contents of the patent office.
Claims (10)
1. The protective material is characterized by comprising the following components in percentage by weight:
85-98% of first polylactic acid resin and 2-15% of anti-aging concentrated master batch;
wherein, the anti-aging concentrated master batch comprises: a second polylactic acid resin, an antioxidant and an optional auxiliary agent.
2. The protective material according to claim 1, wherein the protective material comprises the following components in percentage by weight: 85-95% of first polylactic acid resin and 5-15% of anti-aging concentrated master batch;
preferably, the protective material comprises the following components in percentage by weight: 90-93% of first polylactic acid resin and 7-10% of anti-aging concentrated master batch.
3. The protective material according to claim 1, wherein the anti-aging concentrated master batch comprises the following components in parts by weight: 65-90 parts of second polylactic acid resin, 5-40 parts of antioxidant and 0-10 parts of auxiliary agent;
preferably, the anti-aging concentrated master batch comprises the following components in parts by weight: 74-86 parts of second polylactic acid resin, 6-30 parts of antioxidant and 1-5 parts of auxiliary agent.
4. The protective material according to any one of claims 1 to 3, wherein the first polylactic acid-based resin comprises a polylactic acid resin, a modified polylactic acid resin, or a composite material comprising a polylactic acid resin;
the second polylactic acid resin comprises a polylactic acid resin, a modified polylactic acid resin or a composite material containing a polylactic acid resin;
preferably, the first polylactic acid-based resin is the same as or different from the second polylactic acid-based resin;
preferably, the antioxidant comprises one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], 2, 6-di-tert-4 methylphenol, dilauryl thiodipropionate, distearyl thiodipropionate or tris [2, 4-di-tert-butylphenyl ] phosphite;
preferably, the adjuvant comprises one or more of a colorant, a brightener, or a silicone oil.
5. The use of the protective material of any one of claims 1 to 4 in the fields of wind prevention, sand control, sand prevention and fixation or improvement of sandy vegetation growth.
6. A sand screen wherein the screen is woven from a monofilament material comprising the protective material of any one of claims 1 to 4.
7. The sand control net according to claim 6, wherein the monofilament material has a diameter of 0.15-0.4 mm.
8. The sand control net according to claim 6 or 7, wherein the sand control net has one or more opening rates, and the net surface of the sand control net has a regular mesh structure;
preferably, the sand control net has a plurality of opening rates, the sand control net comprises an upper sand control net and a lower sand control net, the opening rate of the upper sand control net is 60% -70%, and the opening rate of the lower sand control net is 45% -65%;
preferably, the sand control net has an opening ratio of 40% to 70%;
preferably, the weaving structure of the sand control net is a plain weave, a honeycomb weave or a combination of the plain weave and the honeycomb weave;
preferably, the sand control net comprises an upper section sand control net and a lower section sand control net, wherein the upper section sand control net is a honeycomb structure, and the lower section sand control net is a plain structure; or the upper section sand prevention net is a plain weave, and the lower section sand prevention net is a honeycomb weave.
9. A method for preparing a sand control net, wherein the sand control net is the sand control net according to any one of claims 6 to 8, and the method comprises the following steps:
mixing the second polylactic acid resin, the antioxidant and optional auxiliary agents, and preparing into anti-aging concentrated master batches;
mixing the anti-aging concentrated master batch and the first polylactic acid resin in proportion to prepare monofilaments;
and weaving the monofilaments into the sand control net.
10. A sand control device comprising the sand control net and the sand control net fixing mechanism according to any one of claims 6 to 8.
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