CN111472175A - Woven bag coating, preparation method, coating method and woven bag - Google Patents
Woven bag coating, preparation method, coating method and woven bag Download PDFInfo
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- CN111472175A CN111472175A CN202010286681.8A CN202010286681A CN111472175A CN 111472175 A CN111472175 A CN 111472175A CN 202010286681 A CN202010286681 A CN 202010286681A CN 111472175 A CN111472175 A CN 111472175A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/045—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with polyolefin or polystyrene (co-)polymers
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/20—Packaging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention provides a woven bag coating, a preparation method, a coating method and a woven bag, and solves the technical problems that in the prior art, when a cement film-coated plastic woven bag is prepared, air exhaust needs to be solved by punching holes in a plastic woven cloth coated with a film, but the phenomena of leakage, bubbling and ash leakage during filling exist in the punching holes, and the woven bag is easily damped in the later period. The woven bag coating comprises the following raw materials in percentage by weight: 2% -15% of low-density polyethylene; 40% -70% of special-grade polypropylene; 30-60% of first-grade polypropylene; whitening agent: 0.3% -0.5%; masterbatch: 2% -10%; anti-reflection master batch: 0.2% -0.5%; cooling the master batch: 0.05% -0.1%; paraffin wax: 0.5% -1%; the sum of the weight percentages of the raw materials is 100 percent. The invention is used for preparing the cement woven bag, and the woven bag has good exhaust effect, high tensile strength and good moisture resistance.
Description
Technical Field
The invention relates to a coating, and in particular relates to a woven bag coating, a preparation method, a coating method and a woven bag.
Background
Coating is a term in the process of manufacturing woven bags, and the principle of the coating is to coat resin on plastic woven cloth in a molten state. Only the molten resin is coated on the plastic woven cloth and immediately cooled to obtain the two-in-one woven cloth, namely the composite film plastic woven bag. However, when a plastic film is coated on the woven plastic cloth, the air impermeability is caused, and the exhaust performance is greatly reduced.
In the use process of the laminated plastic woven bag, the existing cement enterprises generally fill the cement tank into the laminated plastic woven bag through air pressure by a rotary air pressure packaging machine, and the bag output volume after filling in domestic cement plants basically reaches 60-120 tons/hour. Under this prerequisite, cement wrapping bag itself needs certain exhaust function, otherwise unable up to standard cement filling's weight requirement and the exhaust requirement after the filling, if exhaust problem is solved not well during cement filling, firstly influence filling efficiency, secondly the bag is heavy the qualification rate and can not reach the requirement. For the composite film plastic woven bag, the phenomena of leakage, overflow and ash leakage during filling and the moisture-proof problem during transportation and use must be considered; in addition, the cement packaging bag with insufficient exhaust is more prone to bag breakage in the loading and falling process. Therefore, when the cement composite film plastic woven bag is used, the cement can be timely filled under the action of certain wind pressure during filling, the phenomena of leakage, overflow and ash leakage are avoided as much as possible during filling, and the moisture-proof purpose and the phenomena of falling and bag breaking are also avoided as much as possible during transportation, loading, unloading and storage.
In the prior art, in the bag making process, the plastic woven cloth coated with the film is vertically rolled and punched by a punching needle roller, the exhaust holes are large, the number of the holes is large, the exhaust performance is good, the filling efficiency is high, but cement is seriously overflowed during filling, and the moisture resistance is poor; the air exhaust holes are small, the number of holes is small, the air exhaust performance is poor, the filling efficiency is low, but cement leakage is less during filling, the moisture resistance is good, but the moisture resistance of the composite membrane woven bag in a non-porous state cannot be achieved. At present, holes punched on the bag surface of the composite film plastic woven bag are ultramicro holes (60 holes in each square) which are the smallest punching technology at home and abroad, but the warp and weft tension of the woven bag is damaged to different degrees or greatly no matter the holes with small quantity or the punching mode with too dense holes. And the moisture resistance of the cement packaging bag is reduced to different degrees.
The applicant has found that the prior art has at least the following technical problems:
1. when the cement film-coated plastic woven bag is prepared in the prior art, the problem of exhaust needs to be solved by punching on the plastic woven cloth coated with the film, but the phenomena of leakage, bubbling and ash leakage during filling exist in the punching process, and the problem that the bag is easy to damp in the later period is solved.
2. In the prior art, when the cement film-coated plastic woven bag is prepared, the tensile strength of the woven bag is lost due to punching.
Disclosure of Invention
The invention aims to provide a woven bag coating, a preparation method, a coating method and a woven bag, and aims to solve the technical problems that in the prior art, when a cement film-coated plastic woven bag is prepared, the problem of exhaust needs to be solved by punching holes on a plastic woven cloth coated with a film, but the phenomena of leakage, bubbling and ash leakage during filling exist in the punching holes, and the woven bag is easy to damp in the later period. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a woven bag coating which comprises the following raw materials in percentage by weight:
2% -15% of low-density polyethylene;
40% -70% of special-grade polypropylene;
30-60% of first-grade polypropylene;
whitening agent: 0.3% -0.5%;
masterbatch: 2% -10%;
anti-reflection master batch: 0.2% -0.5%;
cooling the master batch: 0.05% -0.1%;
paraffin wax: 0.5% -1%;
the sum of the weight percentages of the raw materials is 100 percent.
Further, the weight percentage of each raw material is as follows:
6 to 10 percent of low-density polyethylene;
45% -60% of special-grade polypropylene;
35% -50% of first-grade polypropylene;
whitening agent: 0.35% -0.45%;
masterbatch: 5% -8%;
anti-reflection master batch: 0.3% -0.4%;
cooling the master batch: 0.07 percent to 0.09 percent;
paraffin wax: 0.5% -1%;
the sum of the weight percentages of the raw materials is 100 percent.
Further, the weight percentage of each raw material is as follows:
7.5 percent of low-density polyethylene;
47% of special grade polypropylene;
38% of first-grade polypropylene;
whitening agent: 0.4 percent;
masterbatch: 6 percent;
anti-reflection master batch: 0.35 percent;
cooling the master batch: 0.08 percent;
paraffin wax: 0.67 percent.
Further, the whitening agent is a fluorescent whitening agent.
Further, the preparation method of the special grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 1.5-2.5: 7.5-8.5; then granulating to obtain a finished product, wherein the ash content of the finished product is 4% -6%.
Further, the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 4-6: 4-6; then granulating to obtain a finished product, wherein the ash content of the finished product is 8% -12%.
The preparation method of the woven bag coating provided by the invention comprises the following steps:
(1) preparing raw materials according to a ratio;
① preparing special grade polypropylene;
the preparation method of the special-grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 1.5-2.5: 7.5-8.5; then granulating to obtain a finished product, wherein the ash content of the finished product is 4% -6%;
② preparing first-grade polypropylene;
the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 4-6: 4-6; then granulating to obtain a finished product, wherein the ash content of the finished product is 8% -12%;
③ weighing the raw materials according to the proportion;
(2) pouring special-grade polypropylene, first-grade polypropylene, a whitening agent, a master batch, an anti-reflection master batch, a degrading agent and paraffin into a container, and uniformly stirring in the container to obtain a mixture A;
(3) baking and frying the mixture A prepared in the step (2) at the temperature of 80-120 ℃; baking and frying until the water content in the mixture A is 0.01-0.1%;
(4) when the water content in the mixture A in the step (3) is 0.01-0.1%, adding low-density polyethylene into the mixture A, and continuously baking and frying at the temperature of 80-120 ℃; and (3) uniformly mixing the mixture A and the low-density polyethylene, wherein the water content of the mixture A and the low-density polyethylene is 0.01-0.1%, and thus obtaining the woven bag coating.
Further, the baking and frying temperature in the step (2) and the step (3) is 100 ℃.
The invention provides a coating method of a woven bag coating, which adopts a coating machine to coat the woven bag coating on woven bag base cloth, and comprises the following specific steps:
(1) add the coating machine feed inlet with foretell braided bag coating, rethread material pipe heating plastify is extruded, and the interval temperature of material pipe divide into four groups in proper order: 1 group, 2 groups, 3 groups and 4 groups, wherein the corresponding temperatures are as follows: 150-160 ℃, 170-180 ℃, 180-200 ℃ and 190-210 ℃; the plasticized woven bag coating reaches a die head through a tee joint and is extruded, the temperature of an upper tee joint is set to be 210-220 ℃, and the temperature of a lower tee joint is set to be 200-210 ℃; the temperature of the die head is set to be divided into a left interval, a middle interval and a right interval which are respectively 205-215 ℃, 210-220 ℃ and 205-215 ℃;
(2) and extruding through a front die head and a rear die head, respectively coating the front and the back of the woven bag base cloth, and then rolling and molding the woven bag base cloth.
The invention provides a woven bag prepared by adopting the woven bag coating.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
the woven bag coating and the woven bag coating prepared by the preparation method provided by the invention are coated on the woven bag base cloth by adopting the coating method of the woven bag coating provided by the invention, so that the woven bag provided by the invention can be prepared, the woven bag has a good exhaust effect on the premise of not needing a punching process, the cement greatly reduces the dust of the bag body in the filling and transportation processes, and the phenomena of leakage, overflow and dust leakage in the filling process existing in punching are avoided; the strength of the woven cloth without punching can be greatly reserved, zero loss of tensile strength is realized in a film coating process, higher tensile strength can be obtained at the same production cost so as to be suitable for the loading and unloading of the existing cement bag, and the phenomenon of bag breaking in the process of loading and dropping is avoided as much as possible; in addition, the film of the coating film is not damaged by punching, and the requirement of the existing cement on the moisture resistance in the storage process can be further met.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Description of raw materials:
wire drawing grade polypropylene particles: the polypropylene particles are made of the cloud-sky-S003G wire-drawing grade polypropylene particles;
cooling master batch: PP cooling master batches are adopted.
Example 1:
1.1, preparing a woven bag coating:
the invention provides a woven bag coating which comprises the following raw materials in percentage by weight: 7.5 percent of low-density polyethylene; 47% of special grade polypropylene; 38% of first-grade polypropylene; whitening agent: 0.4 percent; masterbatch: 6 percent; anti-reflection master batch: 0.35 percent; a degradation agent: 0.08 percent; paraffin wax: 0.67 percent.
1.2 the preparation method comprises the following steps:
(1) preparing raw materials according to a ratio;
① preparing special grade polypropylene;
the preparation method of the special-grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 2: 8; then granulating to obtain a finished product, wherein the ash content of the finished product is 5%;
② preparing first-grade polypropylene;
the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 5: 5; then granulating to obtain a finished product, wherein the ash content of the finished product is 10%;
③ weighing the raw materials according to the proportion;
(2) pouring special-grade polypropylene, first-grade polypropylene, a whitening agent, a master batch, an anti-reflection master batch, a cooling master batch and paraffin into a container, and uniformly stirring in the container to obtain a mixture A;
(3) baking and frying the mixture A prepared in the step (2) at the temperature of 100 ℃; until the moisture content in the mixture A is 0.05 percent;
(4) when the water content in the mixture A in the step (3) is 0.05 percent, adding low-density polyethylene into the mixture A, and continuously frying at the temperature of 100 ℃; and uniformly mixing the mixture A and the low-density polyethylene, wherein the water content of the mixture A and the low-density polyethylene is 0.05 percent, and thus obtaining the woven bag coating.
Example 2:
preparing a woven bag coating:
the invention provides a woven bag coating which comprises the following raw materials in percentage by weight: 15% of low-density polyethylene; 40% of special grade polypropylene; 31.2 percent of primary polypropylene; whitening agent: 0.3 percent; masterbatch: 10 percent; anti-reflection master batch: 2 percent; cooling the master batch: 0.5 percent; paraffin wax: 1 percent.
The preparation method comprises the following steps:
(1) preparing raw materials according to a ratio;
① preparing special grade polypropylene;
the preparation method of the special-grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 1.5: 8.5; then granulating to obtain a finished product, wherein the ash content of the finished product is 6%;
② preparing first-grade polypropylene;
the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 4: 6; then granulating to obtain a finished product, wherein the ash content of the finished product is 12%;
③ weighing the raw materials according to the proportion;
(2) pouring special-grade polypropylene, first-grade polypropylene, a whitening agent, a master batch, an anti-reflection master batch, a cooling master batch and paraffin into a container, and uniformly stirring in the container to obtain a mixture A;
(3) baking and frying the mixture A prepared in the step (2) at the temperature of 120 ℃; until the water content in the mixture A is 0.01 percent;
(4) when the water content in the mixture A in the step (3) is 0.01 percent, adding low-density polyethylene into the mixture A, and continuously frying at the temperature of 120 ℃; and (3) uniformly mixing the mixture A and the low-density polyethylene, wherein the water content of the mixture A and the low-density polyethylene is 0.01%, and thus obtaining the woven bag coating.
Example 3:
preparing a woven bag coating:
the invention provides a woven bag coating which comprises the following raw materials in percentage by weight: 2% of low-density polyethylene; special grade polypropylene 55.25%; 30% of first-grade polypropylene; whitening agent: 0.5 percent; masterbatch: 2 percent; anti-reflection master batch: 10 percent; cooling the master batch: 0.2 percent; paraffin wax: 0.05 percent.
The preparation method comprises the following steps:
(1) preparing raw materials according to a ratio;
① preparing special grade polypropylene;
the preparation method of the special-grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 2.5: 7.5; then granulating to obtain a finished product, wherein the ash content of the finished product is 4%;
② preparing first-grade polypropylene;
the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 6: 4; then granulating to obtain a finished product, wherein the ash content of the finished product is 8%;
③ weighing the raw materials according to the proportion;
(2) pouring special-grade polypropylene, first-grade polypropylene, a whitening agent, a master batch, an anti-reflection master batch, a degrading agent and paraffin into a container, and uniformly stirring in the container to obtain a mixture A;
(3) baking and frying the mixture A prepared in the step (2) at the temperature of 80 ℃; until the water content in the mixture A is 0.1 percent;
(4) when the water content in the mixture A in the step (3) is 0.1%, adding low-density polyethylene into the mixture A, and continuously frying at the temperature of 80 ℃; and (3) uniformly mixing the mixture A and the low-density polyethylene, wherein the water content of the mixture A and the low-density polyethylene is 0.1%, and thus obtaining the woven bag coating.
Example 4:
preparing a woven bag coating:
the invention provides a woven bag coating which comprises the following raw materials in percentage by weight: 6% of low-density polyethylene; 49.58% of special grade polypropylene; 35% of first-grade polypropylene; whitening agent: 0.45 percent; masterbatch: 8 percent; anti-reflection master batch: 0.4 percent; cooling the master batch: 0.07 percent; paraffin wax: 0.5 percent.
The preparation method comprises the following steps: the same as in example 1.
Example 5:
preparing a woven bag coating: the invention provides a woven bag coating which comprises the following raw materials in percentage by weight: 10% of low-density polyethylene; 45% of special grade polypropylene; 38.41% of primary polypropylene; whitening agent: 0.3 percent; masterbatch: 5 percent; anti-reflection master batch: 0.3 percent; cooling the master batch: 0.09%; paraffin wax: 0.9 percent.
The preparation method comprises the following steps: the same as in example 1.
Example 6:
preparing a woven bag:
(1) the woven bag coating prepared in the above embodiments 1 to 5 is added to the feed port of the coating machine, and then is heated, plasticized and extruded through the material pipe, and the interval temperature of the material pipe is divided into four groups in sequence: 1 group, 2 groups, 3 groups and 4 groups, wherein the corresponding temperatures are as follows: 150-160 ℃, 170-180 ℃, 180-200 ℃ and 190-210 ℃; the plasticized woven bag coating reaches a die head through a tee joint and is extruded, the temperature of an upper tee joint is set to be 210-220 ℃, and the temperature of a lower tee joint is set to be 200-210 ℃; the temperature of the die head is set to be divided into a left interval, a middle interval and a right interval which are respectively 205-215 ℃, 210-220 ℃ and 205-215 ℃;
(2) extruding through a front die head and a rear die head, respectively coating the front side and the back side of the woven bag base cloth, and then rolling and molding the woven bag base cloth; the woven bags correspondingly prepared by the woven bag coating prepared in the embodiment 1-embodiment 5 are woven bag 1, woven bag 2, woven bag 3, woven bag 4 and woven bag 5.
Experimental example:
in comparative examples 1-4, the conventional coating material (polypropylene N-Z30S + polyethylene 1C7A) was used to prepare woven bags, and the preparation process was the same as in example 6.
The woven bags 1, 2, 3, 4 and 5 prepared in the embodiment 6 are compared with the comparative examples 1 to 4 for data detection:
1. and (3) air displacement comparison test: the air permeability measuring instrument was used to measure the air displacement, and the measurement results are shown in table 1 below:
2. and (3) comparing and testing the tension of the warp and the weft: the tension of the warp and weft of the woven bag base cloth is detected by the aid of the tensioner in the same number of 5 centimeters, the numerical values are measured by the same base cloth before and after coating, data comparison is carried out, tension damage is proved to be the lowest value and is close to zero damage, and the detection results are as shown in the following table 2:
3. and (3) moisture resistance comparison test:
the results are shown in table 3 below:
TABLE 1 air displacement comparison test
TABLE 2 comparison of warp and weft tension
TABLE 3 comparison of moisture resistance tests
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A woven bag coating is characterized in that: the raw materials of the material comprise the following components in percentage by weight:
2% -15% of low-density polyethylene;
40% -70% of special-grade polypropylene;
30-60% of first-grade polypropylene;
whitening agent: 0.3% -0.5%;
masterbatch: 2% -10%;
anti-reflection master batch: 0.2% -0.5%;
cooling the master batch: 0.05% -0.1%;
paraffin wax: 0.5% -1%;
the sum of the weight percentages of the raw materials is 100 percent.
2. The woven bag paint as claimed in claim 1, wherein: the weight percentage of each raw material is as follows:
6 to 10 percent of low-density polyethylene;
45% -60% of special-grade polypropylene;
35% -50% of first-grade polypropylene;
whitening agent: 0.35% -0.45%;
masterbatch: 5% -8%;
anti-reflection master batch: 0.3% -0.4%;
cooling the master batch: 0.07 percent to 0.09 percent;
paraffin wax: 0.5% -1%;
the sum of the weight percentages of the raw materials is 100 percent.
3. The woven bag paint according to claim 2, wherein: the weight percentage of each raw material is as follows:
7.5 percent of low-density polyethylene;
47% of special grade polypropylene;
38% of first-grade polypropylene;
whitening agent: 0.4 percent;
masterbatch: 6 percent;
anti-reflection master batch: 0.35 percent;
cooling the master batch: 0.08 percent;
paraffin wax: 0.67 percent.
4. The woven bag paint according to any one of claims 1 to 3, wherein: the whitening agent is a fluorescent whitening agent.
5. The woven bag paint according to claim 4, wherein: the preparation method of the special-grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 1.5-2.5: 7.5-8.5; then granulating to obtain a finished product, wherein the ash content of the finished product is 4% -6%.
6. The woven bag paint according to claim 5, wherein: the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 4-6: 4-6; then granulating to obtain a finished product, wherein the ash content of the finished product is 8% -12%.
7. The method for preparing the woven bag dope according to any one of claims 1 to 6, wherein: the method comprises the following steps:
(1) preparing raw materials according to a ratio;
① preparing special grade polypropylene;
the preparation method of the special-grade polypropylene comprises the following steps: mixing the wire-drawing grade polypropylene particles and the first-grade regenerated polypropylene particles according to the weight ratio of 1.5-2.5: 7.5-8.5; then granulating to obtain a finished product, wherein the ash content of the finished product is 4% -6%;
② preparing first-grade polypropylene;
the preparation method of the first-grade polypropylene comprises the following steps: mixing the primary regenerated polypropylene particles and the secondary regenerated polypropylene particles according to the weight ratio of 4-6: 4-6; then granulating to obtain a finished product, wherein the ash content of the finished product is 8% -12%;
③ weighing the raw materials according to the proportion;
(2) pouring special-grade polypropylene, first-grade polypropylene, a whitening agent, a master batch, an anti-reflection master batch, a degrading agent and paraffin into a container, and uniformly stirring in the container to obtain a mixture A;
(3) baking and frying the mixture A prepared in the step (2) at the temperature of 80-120 ℃; baking and frying until the water content in the mixture A is 0.01-0.1%;
(4) when the water content in the mixture A in the step (3) is 0.01-0.1%, adding low-density polyethylene into the mixture A, and continuously baking and frying at the temperature of 80-120 ℃; and (3) uniformly mixing the mixture A and the low-density polyethylene, wherein the water content of the mixture A and the low-density polyethylene is 0.01-0.1%, and thus obtaining the woven bag coating.
8. The method for preparing the woven bag paint according to claim 7, wherein: the baking and frying temperature in the step (2) and the step (3) is 100 ℃.
9. The coating method of the woven bag dope according to any one of claims 1 to 6, characterized in that: coating the woven bag coating of any one of claims 1 to 6 on the woven bag base cloth by using a coating machine, which comprises the following specific steps:
(1) the woven bag coating of any one of claims 1 to 6 is added into a feeding port of a coating machine, and then is heated, plasticized and extruded through material pipes, wherein the interval temperature of the material pipes is divided into four groups in sequence: 1 group, 2 groups, 3 groups and 4 groups, wherein the corresponding temperatures are as follows: 150-160 ℃, 170-180 ℃, 180-200 ℃ and 190-210 ℃; the plasticized woven bag coating reaches a die head through a tee joint and is extruded, the temperature of an upper tee joint is set to be 210-220 ℃, and the temperature of a lower tee joint is set to be 200-210 ℃; the temperature of the die head is set to be divided into a left interval, a middle interval and a right interval which are respectively 205-215 ℃, 210-220 ℃ and 205-215 ℃;
(2) and extruding through a front die head and a rear die head, respectively coating the front and the back of the woven bag base cloth, and then rolling and molding the woven bag base cloth.
10. A woven bag prepared by using the woven bag dope of any one of claims 1 to 6.
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| WO2001005588A1 (en) * | 1999-07-21 | 2001-01-25 | Dexter Speciality Materials, Ltd. | Polymer coated web with good water vapour permeability |
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