CN115958841A - Preparation process of laminating valve port bag - Google Patents
Preparation process of laminating valve port bag Download PDFInfo
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- CN115958841A CN115958841A CN202211688314.6A CN202211688314A CN115958841A CN 115958841 A CN115958841 A CN 115958841A CN 202211688314 A CN202211688314 A CN 202211688314A CN 115958841 A CN115958841 A CN 115958841A
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Abstract
The invention discloses a preparation process of a laminating valve port bag, belonging to the technical field of packaging material preparation, and comprising the following steps of: (1) preparing laminating resin; (2) Extruding and coating the laminating resin on the surface of a base material through an extruder to prepare a laminating material; (3) The laminating material is taken as a bag making raw material, and the laminating valve port bag is prepared by sequentially performing edge folding, cutting, edge sealing and valve port cutting processes through valve port bag making equipment; the invention provides a method for preparing a valve bag by utilizing a laminating process which is simple and mature in process and high in production speed, so that the production efficiency of the valve bag is improved.
Description
Technical Field
The invention relates to the technical field of packaging material preparation, in particular to a preparation process of a laminating valve bag.
Background
The valve bag is commonly called a bottom pasting bag, the materials are fed from a top or bottom valve port, a special filling device is adopted, the materials are filled into the valve bag to form a square body, and the bag is orderly stacked and attractive, and belongs to an environment-friendly bag. At present, the packaging of materials such as ultrafine powder and granular materials, such as fine chemical raw materials and pharmaceutical and chemical raw materials, such as edible powder, chemical fertilizer, synthetic materials, explosive, grain, salt, mineral substances and other powdery or granular solid materials, is gradually changed from the previous manual packaging mode to the current semi-automatic or full-automatic machine packaging, and the valve bag is widely used due to the adoption of automatic filling, high efficiency, accurate metering and less manpower input.
The existing valve port bag is mainly a composite valve port bag which is formed by a valve port of polyethylene or polypropylene woven cloth or is made of outer-layer cloth/film/paper and inner-layer warp-weft plastic woven materials, in order to meet application requirements of various products, such as strengthening, water resistance, oil resistance and the like, the composite valve port bag is often manufactured after compositing by a casting method (compositing the cloth/film into two or compositing the cloth/film/paper into three) on the basis of a base material, and the problem that the valve port bag is easy to damp to cause quality reduction and easy damage of the valve port bag and material bearing capacity reduction can be prevented, but the multilayer composite preparation process is more complicated.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation process of a laminating valve bag, which is used for preparing the valve bag by utilizing a laminating process which is simple and mature in process and high in production speed, so that the production efficiency of the valve bag is improved; meanwhile, in order to promote the removal of the laminating layer, the invention also provides laminating resin which has high mechanical property and is easy to remove.
The purpose of the invention is realized by adopting the following technical scheme:
a preparation process of a laminating valve bag comprises the following steps:
(1) Preparing laminating resin;
(2) Extruding the laminating resin by an extruder and coating the laminating resin on the surface of a base material to prepare a laminating material;
(3) And (3) taking the laminating material as a bag making raw material, and sequentially carrying out processes of edge folding, cutting, edge sealing and valve port cutting through valve port bag making equipment to obtain the laminating valve port bag.
In some preferred embodiments of the present invention, the laminating resin is a copolymerization modified product of dicyclopentadiene, and the preparation method comprises the following steps:
s1, preparation of modified monomer
Weighing 1, 4-butylene glycol, dissolving the 1, 4-butylene glycol in an anhydrous dichloromethane solvent, adding imidazole under the condition of ice water bath, stirring and mixing the mixture fully, dropwise adding a diisopropyldichlorosilane solution while stirring, stirring the mixture at normal temperature to react for 10-60min after the dropwise adding is finished, separating and removing precipitates, performing reduced pressure concentration on the obtained solution, and purifying the obtained solution by using a silica gel chromatographic column to remove unreacted reactants to obtain the modified monomer;
s2, preparation of copolymerized resin
Weighing dicyclopentadiene and styrene respectively, mixing, adding the modified monomer, fully stirring and mixing to obtain a monomer mixture, adding a catalyst, heating to 80-120 ℃, and carrying out heat preservation reaction for 1-30min to obtain the modified styrene-butadiene rubber.
In some preferred embodiments of the present invention, the mass ratio of the 1, 4-butylene glycol to the imidazole and the diisopropyldichlorosilane in step S1 is 1: (0.75-0.8): (1-1.1).
In some preferred embodiments of the present invention, the mass ratio of the dicyclopentadiene to the styrene and the modifying monomer in step S2 is 10: (7-12): (1-2).
In some preferred embodiments of the present invention, the catalyst is a catalyst system comprising ethylenebridged bisindenyl zirconium dichloride as a main catalyst and methylaluminoxane as a cocatalyst, or a catalyst system comprising tridentate tungstophenol as a main catalyst and diethylaluminum monochloride as a cocatalyst, or a SPHOS PD G2 catalyst or a Xantphos Pd G3 catalyst.
In some preferred embodiments of the present invention, the monomer mixture further comprises a functional monomer, and the preparation method comprises the following steps:
weighing 4-cyanostyrene, dissolving the 4-cyanostyrene in absolute ethyl alcohol, adding zinc chloride or chlorosulfonic acid as a catalyst, grinding the mixture to be uniform, heating and stirring the mixture until the solvent is completely volatilized to obtain a mixture, heating the mixture to 180-280 ℃, carrying out heat treatment for 24-48h under the condition of heat preservation, cooling the mixture to room temperature to obtain a crude product, grinding the crude product, adding deionized water to wash the crude product until the crude product is neutral or has no metal ions, and drying the crude product in vacuum to obtain the functional monomer.
In some preferred embodiments of the present invention, the mass ratio of the 4-cyanostyrene to the zinc chloride or chlorosulfonic acid is 10: (0.45-0.5).
In some preferred embodiments of the present invention, the mass ratio of the functional monomer to the dicyclopentadiene is (1-2): 10.
in some preferred embodiments of the present invention, the substrate is paper, cardboard, aluminum foil, cellophane, nonwoven fabric, woven fabric, stretched polypropylene, polyester, nylon, or high density polyethylene.
In some preferred embodiments of the present invention, the lamination resin has a lamination thickness of 1 to 50 μm.
The invention has the beneficial effects that:
aiming at the problem that the valve bag in the prior art is often required to be prepared by a complicated multilayer composite process to meet the application requirement, the invention provides a method for preparing the valve bag by utilizing a laminating process which is simple and mature in process and high in production speed, so that the production efficiency of the valve bag is improved; furthermore, the existing laminating resin has the characteristics of difficult degradation and ultrathin laminating process, so that the waste laminating valve bags are difficult to recycle and easy to generate micro plastic pollution, and the invention also provides a degradable laminating resin based on the degradable laminating resin, and particularly, the invention introduces styrene and a modified monomer for copolymerization on the basis of dicyclopentadiene, and the modified monomer is a silicon-containing cyclized olefin obtained by substituting butylene glycol with dichlorosilane to achieve controllable removal of the laminating layer; furthermore, the mechanical strength of the laminating resin is reduced by introducing a modified monomer into a resin matrix, the influence of the modified monomer on the strength of the resin is reduced by introducing a functional monomer, specifically, the modified styrene crosslinking monomer with a triazine structure is prepared by cyclization reaction of aromatic nitrile, and is introduced into the resin matrix to improve the crosslinking degree of the resin, so that the mechanical strength is improved, and meanwhile, due to the existence of a central triazine group, the functional monomer simultaneously endows the laminating resin with good flame retardance.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
A preparation process of a laminating valve bag comprises the following steps:
(1) Preparing laminating resin;
s1, preparation of modified monomer
Weighing 1, 4-butenediol, dissolving the butenediol in an anhydrous dichloromethane solvent, adding imidazole under the condition of ice water bath, stirring and mixing the mixture fully, dropwise adding a diisopropyldichlorosilane solution while stirring, stirring at normal temperature for reacting for 30min after dropwise adding is finished, separating and removing precipitates, performing reduced pressure concentration on the obtained solution, purifying the obtained solution by using a silica gel chromatographic column to remove unreacted reactants, wherein the mesh number of the silica gel is 400 meshes, and an eluent is a mixed solvent of hexane and ethyl acetate (v/v = 20;
the mass ratio of the 1, 4-butylene glycol to the imidazole to the diisopropyl dichlorosilane is 1.76:1.36:1.85;
s2, preparation of copolymerized resin
Weighing dicyclopentadiene and styrene respectively, mixing, adding the modified monomer, fully stirring and mixing to obtain a monomer mixture, adding a catalyst, heating to 90 ℃, and carrying out heat preservation reaction for 20min to obtain the modified styrene-butadiene rubber;
the mass ratio of the dicyclopentadiene to the styrene to the modified monomer is 10:8.7:1.4;
the catalyst is a catalyst system which takes ethylene bridge bisindenyl zirconium dichloride as a main catalyst and methylaluminoxane as a cocatalyst; the mol ratio of the dicyclopentadiene to the zirconium and the aluminum in the catalyst is 1000:50:1;
(2) Extruding the laminating resin by an extruder and coating the laminating resin on the surface of a substrate to prepare a laminating material, wherein the substrate is paper, a paperboard, an aluminum foil, cellophane, or non-woven fabrics or woven fabrics prepared from polypropylene, polyester, nylon and high-density polyethylene; the laminating thickness of the laminating resin is 20 mu m;
(3) The laminating material is taken as a bag making raw material, and the laminating valve port bag is prepared by sequentially performing edge folding, cutting, edge sealing and valve port cutting processes through valve port bag making equipment; specifically, a perforating machine is used for perforating a pinhole on the material of the laminated film; rolling the pinhole-punched film coating material into a large roll in a width division manner; one end of each layer of laminating material on the large roll in the length direction is aligned, one side of each layer of laminating material in the width direction is aligned, the laminating materials are overlapped and placed on a material placing frame of the bonding machine, and pinholes on adjacent laminating material layers are staggered; adhering one sides aligned in the width direction together by using an adhering machine to form a flush adhesive joint, and adhering the other sides of the laminated materials of all layers together by using the adhering machine to form a combined adhesive joint; the laminated material after the edge-aligning bonding seam and the combining bonding seam are bonded is placed on a material placing frame of a folding machine, the laminated material on one side with the combining bonding seam is folded for 180 degrees or bent by the folding machine, the laminated material on one side with the edge-aligning bonding seam is oppositely folded for 180 degrees or bent, the combining bonding seam is covered by the edge-aligning bonding seam, a multi-layer tube material of the exhaust valve pocket is formed, and the multi-layer tube material is rolled into a multi-layer tube material large roll; placing a large roll coiled into a multilayer tube material on a material placing frame of a bag making machine, placing a lower template into the tube material below the edge aligning bonding seam and the combining bonding seam, bonding a film at one side with the edge aligning bonding seam and a film at one side with the combining bonding seam together by a U-shaped heat sealing cutter to form a U-shaped bonding seam, and covering the edge aligning bonding seam and the combining bonding seam by the vertical edge at the outer side of the U-shaped bonding seam; the upper end and the lower end of the bag in the length direction are thermally sealed and thermally cut by a cutter of the bag making machine according to the set length of the bag to form an upper bonding seam and a lower bonding seam, and a gap between an upper transverse edge and the upper bonding seam of the U-shaped bonding seam is a charging valve port, so that a valve bag is made.
Example 2
A preparation process of a laminating valve bag comprises the following steps:
(1) Preparing laminating resin;
s1, preparation of modified monomer
Weighing 1, 4-butylene glycol, dissolving the 1, 4-butylene glycol in an anhydrous dichloromethane solvent, adding imidazole under the condition of ice water bath, stirring and mixing the mixture fully, dropwise adding a diisopropyldichlorosilane solution while stirring, stirring the mixture at normal temperature for reaction for 30min after dropwise adding is finished, separating and removing precipitates, performing reduced pressure concentration on the obtained solution, and purifying the obtained solution by using a silica gel chromatographic column to remove unreacted reactants to obtain the modified monomer;
the mass ratio of the 1, 4-butylene glycol to the imidazole to the diisopropyl dichlorosilane is 1.76:1.36:1.85;
s2, preparation of functional monomer
Weighing 4-cyanostyrene, dissolving the 4-cyanostyrene in absolute ethyl alcohol, adding zinc chloride or chlorosulfonic acid as a catalyst, grinding the mixture to be uniform, heating and stirring the mixture until the solvent is completely volatilized to obtain a mixture, heating the mixture to 240 ℃, carrying out heat treatment for 24 hours under the condition of heat preservation, cooling the mixture to room temperature to obtain a crude product, grinding the crude product to be pulverized, adding deionized water to wash the pulverized product until the product is neutral or has no metal ions, and carrying out vacuum drying to obtain the functional monomer;
the mass ratio of the 4-cyanostyrene to the zinc chloride or chlorosulfonic acid is 10:0.5;
s3, preparation of copolymerized resin
Weighing dicyclopentadiene and styrene respectively, mixing, adding the modified monomer and the functional monomer, fully stirring and mixing to obtain a monomer mixture, adding a catalyst, heating to 90 ℃, and carrying out heat preservation reaction for 20min to obtain the modified functional monomer;
the mass ratio of the dicyclopentadiene to the styrene to the modified monomer to the functional monomer is 10:8.7:1.4:1;
the catalyst is a catalyst system which takes ethylene bridge bisindenyl zirconium dichloride as a main catalyst and methylaluminoxane as a cocatalyst; the mol ratio of the dicyclopentadiene to the zirconium and the aluminum in the catalyst is 1000:50:1;
the steps (2) and (3) are the same as in example 1.
Example 3
A preparation process of a laminating valve bag comprises the following steps:
(1) Preparing laminating resin;
the preparation method is the same as that of example 1, except that the modified monomer is not included in the monomer mixture;
the steps (2) and (3) are the same as in example 1.
Example 4
A preparation process of a laminating valve bag comprises the following steps:
(1) Preparing laminating resin; the laminating resin is low-density polyethylene;
the steps (2) and (3) are the same as in example 1.
Examples of the experiments
1. The tensile strength, elongation at break and flame retardancy of the film of the laminating resin described in examples 1 to 4 were tested according to GB/T13022-1991 (test method for tensile properties of plastic film) and fire rating UL94, and the results were as follows:
| example 1 | Example 2 | Example 3 | Example 4 | |
| Tensile Strength (MPa) | 22.1 | 26.8 | 24.9 | 12.4 |
| Elongation at Break (%) | 71.7 | 68.4 | 70.5 | 387 |
| Flame retardant rating | V-2 | V-0 | V-2 | V-2 |
2. The films of the laminating resins of examples 1-4 were respectively soaked in tetrabutylammonium fluoride solution, and whether the films were dissolved or not was observed, and the dissolution was as follows:
| example 1 | Example 2 | Example 3 | Example 4 | |
| Dissolution behavior | Dissolution | Dissolution | Insoluble matter | Insoluble matter |
3. In examples 1 to 4, the mechanical strength and the adhesive strength of the laminated paper prepared by using paper as a base material were measured according to GB/T10403-2006 and GB/T30768-2014, and the measurement results are as follows:
| example 1 | Example 2 | Example 3 | Example 4 | |
| Longitudinal tensile Strength (MPa) | 38.4 | 42.3 | 41.7 | 25.6 |
| Elongation at Break in longitudinal direction (%) | 10.4 | 9.8 | 9.9 | 10.9 |
| Transverse tensile Strength (MPa) | 32.7 | 38.1 | 35.9 | 20.8 |
| Transverse elongation at Break (%) | 5.9 | 5.2 | 5.4 | 6.8 |
| Degree of adhesion (%) | 90.3 | 88.9 | 91.7 | 90.5 |
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A preparation process of a laminating valve bag is characterized by comprising the following steps:
(1) Preparing laminating resin;
(2) Extruding the laminating resin by an extruder and coating the laminating resin on the surface of a base material to prepare a laminating material;
(3) And (3) taking the laminating material as a bag making raw material, and sequentially carrying out processes of edge folding, cutting, edge sealing and valve port cutting through valve port bag making equipment to obtain the laminating valve port bag.
2. The preparation process of the laminating valve bag according to claim 1, wherein the laminating resin is a copolymerization modified product of dicyclopentadiene, and the preparation method comprises the following steps:
s1, preparation of modified monomer
Weighing 1, 4-butylene glycol, dissolving the 1, 4-butylene glycol in an anhydrous dichloromethane solvent, adding imidazole under the condition of ice water bath, stirring and mixing the mixture fully, dropwise adding a diisopropyldichlorosilane solution while stirring, stirring the mixture at normal temperature to react for 10-60min after the dropwise adding is finished, separating and removing precipitates, performing reduced pressure concentration on the obtained solution, and purifying the obtained solution by using a silica gel chromatographic column to remove unreacted reactants to obtain the modified monomer;
s2, preparation of copolymerized resin
Weighing dicyclopentadiene and styrene respectively, mixing, adding the modified monomer, fully stirring and mixing to obtain a monomer mixture, adding a catalyst, heating to 80-120 ℃, and carrying out heat preservation reaction for 1-30min to obtain the modified styrene-butadiene rubber.
3. The preparation process of the laminating valve bag according to claim 2, wherein the mass ratio of the 1, 4-butylene glycol to the imidazole and the diisopropyl dichlorosilane in step S1 is 1: (0.75-0.8): (1-1.1).
4. The preparation process of the laminating valve bag according to claim 2, wherein the mass ratio of the dicyclopentadiene to the styrene to the modified monomer in step S2 is 10: (7-12): (1-2).
5. The preparation process of the valve bag with the laminated film as claimed in claim 2, wherein the catalyst is a catalyst system with ethylenebridged bisindenyl zirconium dichloride as a main catalyst and methylaluminoxane as a cocatalyst, or a catalyst system with tris-tungstophenol as a main catalyst and diethylaluminum monochloride as a cocatalyst, or a SPHOS PD G2 catalyst or a Xantphos Pd G3 catalyst.
6. The process for preparing a laminated valve bag according to claim 2, wherein the monomer mixture further comprises a functional monomer, and the preparation method comprises the following steps:
weighing 4-cyanostyrene, dissolving the 4-cyanostyrene in absolute ethyl alcohol, adding zinc chloride or chlorosulfonic acid as a catalyst, grinding the mixture to be uniform, heating and stirring the mixture until the solvent is completely volatilized to obtain a mixture, heating the mixture to 180-280 ℃, carrying out heat treatment on the mixture for 24-48 hours under the condition of heat preservation, cooling the mixture to room temperature to obtain a crude product, grinding the crude product, adding deionized water into the mixture, washing the powder until the powder is neutral or has no metal ions, washing the powder out, and drying the powder in vacuum to obtain the functional monomer.
7. The preparation process of the laminating valve bag according to claim 6, wherein the mass ratio of the 4-cyanostyrene to the zinc chloride or chlorosulfonic acid is 10: (0.45-0.5).
8. The preparation process of the laminating valve bag according to claim 6, wherein the mass ratio of the functional monomer to the dicyclopentadiene is (1-2): 10.
9. the preparation process of the laminating valve port bag according to claim 1, wherein the base material is paper, paperboard, aluminum foil, cellophane, non-woven fabric, stretched polypropylene, polyester, nylon or high-density polyethylene.
10. The process for preparing a laminated valve bag according to claim 1, wherein the laminated thickness of the laminated resin is 1-50 μm.
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