CN114591591A - Letter plastic zipper and shaping injection molding process thereof - Google Patents
Letter plastic zipper and shaping injection molding process thereof Download PDFInfo
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- CN114591591A CN114591591A CN202210228679.4A CN202210228679A CN114591591A CN 114591591 A CN114591591 A CN 114591591A CN 202210228679 A CN202210228679 A CN 202210228679A CN 114591591 A CN114591591 A CN 114591591A
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- injection molding
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
- C08L59/04—Copolyoxymethylenes
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an alphabetic plastic-fat zipper and a shaping injection molding process thereof, and relates to the technical field of zipper processing production. The injection molding process comprises the following steps: s1, mixing the polyformaldehyde, the flexibilizer, the crosslinking agent, the antioxidant and the lubricant according to the weight ratio of 1: 1.5: 1: 0.5: pouring 0.75 part by weight of the mixture into a reaction vessel, and uniformly stirring the mixture by a stirrer to obtain a mixed solution; s2, heating the mixed solution obtained in the step S1, and then performing injection molding tooth implantation treatment on the heated stock solution to obtain a plastic particle processing raw material; s3, selecting a certain amount of plastic particle processing raw materials to carry out injection molding surface treatment. According to the invention, the modified powdered styrene butadiene rubber is used as the toughening agent, so that the overall strength of the injection molded zipper is enhanced, the tensile strength of the injection molded zipper is also enhanced, and the horizontal drawing smoothness and the acid resistance of the injection molded zipper are further enhanced by simultaneously adding the lubricant and the antioxidant, so that the service life of the injection molded zipper is prolonged.
Description
Technical Field
The invention relates to the technical field of zipper processing production, in particular to an alphabetic plastic-fat zipper and a shaping injection molding process thereof.
Background
The injection molding zipper is a process device processed by plastic resin, the injection molding zipper on the market mostly adopts the copolyoxymethylene as the raw material, and the properties of the copolyoxymethylene have good strength and wear resistance, so that the zipper prepared by taking the copolyoxymethylene as the raw material also inherits the properties of the copolyoxymethylene, however, the copolyoxymethylene has the defect of poor toughness, and the injection molding zipper prepared by the copolyoxymethylene on the market can often have tooth falling.
In order to enhance the toughness of the paraformaldehyde and thereby improve the notch impact resistance of the paraformaldehyde product, a polyurethane elastomer is often added to the paraformaldehyde, and although the polyurethane elastomer can enhance the toughness of the paraformaldehyde, the addition of the polyurethane elastomer also reduces the tensile strength of the paraformaldehyde, so that the service life of the injection molded zipper is not very long, and a novel process is provided for solving the existing problems.
Disclosure of Invention
The invention aims to provide a letter plastic zipper and a shaping and injection molding process thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a letter plastic zipper and its molding injection molding process, the injection molding process comprises the following steps:
s1, mixing the polyformaldehyde, the flexibilizer, the cross-linking agent, the antioxidant and the lubricant according to the proportion of 1: 1.5: 1: 0.5: pouring 0.75 part by weight of the mixture into a reaction vessel, and uniformly stirring the mixture by a stirrer to obtain a mixed solution;
s2, heating the mixed solution obtained in the step S1, and then performing injection molding tooth implantation treatment on the heated stock solution to obtain a plastic particle processing raw material;
s3, selecting a certain amount of plastic particle processing raw materials to carry out injection molding surface treatment;
s4, selecting a certain amount of cloth bags to be attached to the outer part of the plastic particle processing raw material obtained after the step S3, and then carrying out injection molding internal treatment;
and S5, classifying the finished raw materials after the step S4 according to the opening and closing states, and packaging and warehousing the finished raw materials by a packaging machine.
Furthermore, the weight portion of the copolyformaldehyde in the step S1 is 150-150, the weight portion of the toughening agent is 150-225, the weight portion of the crosslinking agent is 100-150, the weight portion of the antioxidant is 50-75, and the weight portion of the lubricant is 75-112.5.
Further, the toughening agent in the step S1 is emulsion styrene-butadiene rubber or powder styrene-butadiene rubber, the crosslinking agent is liquid bisphenol F type epoxy resin, the antioxidant is one or more of polyphenol antioxidant, phosphorous acid antioxidant and oxygen-containing agent sulfur antioxidant, and the lubricant is one of fatty acid amide or metal soap.
Further, the step of implanting teeth by injection molding in step S2 is to pour the stock solution after the temperature raising treatment in step S2 into an extruder, and extrude the stock solution into a molding die through the extruder, thereby obtaining the plastic particle processing material.
Further, the injection surface treatment in step S3 includes:
polishing: polishing the outer surface of the plastic particle processing raw material to improve the surface smoothness of the plastic particle raw material;
sizing: and the dimension of the plastic particle raw material after polishing treatment is measured, so that the precision of a finished product is improved.
Further, the injection molding internal process in step S4 includes: and (4) tooth punching, head piercing, tooth punching and cutting.
Further, in step S5, the staff is assisted in separating the products by the baffle type sorting machine.
The invention provides the following technical scheme: the letter plastic zipper is manufactured by any one of the forming injection molding processes of the letter plastic zipper.
Compared with the prior art, the invention has the beneficial effects that:
according to the letter plastic zipper and the shaping injection molding process thereof, the modified powdered styrene butadiene rubber is used as the toughening agent, so that the tensile strength of the injection molded zipper is enhanced while the overall strength of the injection molded zipper is enhanced, the horizontal sliding smoothness and the acid resistance of the injection molded zipper are further enhanced by adding the lubricant and the antioxidant simultaneously, and the service life of the injection molded zipper is prolonged.
The letter plastic-fat zipper and the shaping injection molding process thereof further improve the flat-pull strength, the flat-pull smoothness and the acid resistance of a finished zipper by increasing the mass ratio of the co-polyoxymethylene, the toughening agent, the cross-linking agent, the antioxidant and the lubricant, and indirectly prolong the service life of the injection molding zipper.
Drawings
FIG. 1 is a process embodiment of the present invention;
FIG. 2 is a process flow diagram of the present invention;
FIG. 3 is a schematic view showing a composition of the step of treating the surface of the injection mold according to the present invention;
FIG. 4 is a block diagram of an internal processing step of injection molding according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Further, it will be appreciated that the dimensions of the various elements shown in the figures are not drawn to scale, for ease of description, e.g., the thickness or width of some layers may be exaggerated relative to other layers.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one of the figures, it will not need to be further discussed or illustrated in detail in the description of the figures that follows.
As shown in fig. 1 to 4, the present invention provides a technical solution: a letter plastic zipper and its molding injection molding process, the injection molding process comprises the following steps:
s1, mixing the polyformaldehyde, the flexibilizer, the crosslinking agent, the antioxidant and the lubricant according to the weight ratio of 1: 1.5: 1: 0.5: pouring 0.75 part by weight of the mixture into a reaction vessel, and uniformly stirring the mixture by a stirrer to obtain a mixed solution;
s2, heating the mixed solution obtained in the step S1, and then performing injection molding tooth implantation treatment on the heated stock solution to obtain a plastic particle processing raw material;
s3, selecting a certain amount of plastic particle processing raw materials to carry out injection molding surface treatment;
s4, selecting a certain amount of cloth bags to be attached to the outer part of the plastic particle processing raw material obtained after the step S3, and then carrying out injection molding internal treatment;
and S5, classifying the finished raw materials after the step S4 according to the opening and closing states, and packaging and warehousing the finished raw materials by a packaging machine.
It is emphasized that in the examples provided in the present application, the modified powdered styrene-butadiene rubber is used as the toughening agent, so that the tensile strength of the injection molded zipper is enhanced while the overall strength of the injection molded zipper is enhanced, and by adding the lubricant and the antioxidant at the same time, the smoothness and the acid resistance of the injection molded zipper are further enhanced, and the service life of the injection molded zipper is prolonged.
It is further emphasized that in the examples provided in the present application, the service life of the injection molded zipper is indirectly prolonged by increasing the mass ratio of the paraformaldehyde, the toughening agent, the crosslinking agent, the antioxidant and the lubricant to further improve the flat pull strength, the flat pull smoothness and the acid resistance of the finished zipper.
In addition, in the examples provided in the present application, the weight portion of the copolyformaldehyde in the step S1 is 150-.
It should be further noted that, in the embodiments provided in this application, the toughening agent in step S1 is one of emulsion styrene-butadiene rubber or powdered styrene-butadiene rubber, the crosslinking agent is liquid bisphenol F epoxy resin, the antioxidant is one or more of polyphenol antioxidant, phosphorous acid antioxidant and oxygen-containing agent sulfur antioxidant, and the lubricant is one of fatty acid amide or metal soap.
It is emphasized that in the examples provided in the present application, the powdered styrene-butadiene rubber is a product obtained by grafting other monomers on the basis of emulsion styrene-butadiene rubber and adding an anti-aging agent and a release agent.
The powdered styrene-butadiene rubber is specially used for producing modified plastic products in the early practical industrial production, and has the characteristic that the styrene-butadiene rubber obviously improves the low-temperature performance of asphalt and can also obviously improve the high-temperature performance of the plastic products.
It should be further emphasized that in the examples provided herein, the liquid bisphenol F type epoxy resin is mainly used in the fields of casting and casting molding materials, etc. where low liquid viscosity is required.
The bisphenol F type epoxy resin has good heat resistance, water resistance and electrical properties, so that the bisphenol F type epoxy resin can be used for casting a plastic sealant.
In the embodiment provided by the present application, the step of injection molding and tooth implanting in step S2 refers to pouring the stock solution after the temperature raising treatment in step S2 into an extruder, and extruding the stock solution into a molding die through the extruder to finally obtain the plastic particle processing material.
Referring to fig. 3, in the embodiment provided in the present application, the injection molding surface treatment in step S3 includes:
polishing: polishing the outer surface of the plastic particle processing raw material to improve the surface smoothness of the plastic particle raw material;
sizing: and (4) measuring the size of the polished plastic particle raw material, and improving the precision of a finished product.
Referring to fig. 4, in the embodiment provided in the present application, the injection molding internal process in step S4 includes: and (4) tooth punching, head piercing, tooth punching and cutting.
It should be emphasized that, in the embodiment provided in the present application, the step S5 is performed by a baffle sorting machine to assist the worker in separating the products.
The invention provides a technical scheme that: the letter plastic zipper comprises a letter plastic zipper, and is manufactured by any one of the above molding injection molding processes of the letter plastic zipper.
The first embodiment is as follows:
1. 100 parts by weight of copolyoxymethylene, 150 parts by weight of a toughening agent, 100 parts by weight of a crosslinking agent, 50 parts by weight of an antioxidant and 75 parts by weight of a lubricant are prepared.
2. The raw materials are fully stirred uniformly by a stirrer or subjected to injection molding tooth implantation treatment, injection molding is carried out on the raw materials at 190-220 ℃ to form injection molding zipper stacking, then the finished product zipper is obtained through the processing procedures of sizing, slider penetrating and upper and lower stop opening, and the performance test is carried out on the obtained zipper, wherein the results are shown in table 1.
| Item | Test method | Test results | Test determination |
| Horizontal tensile strength | QB/T 2172 | 510 | Superior food |
| Smoothness of horizontal drawing | QB/T 2172 | 70 | Superior food |
| Acid resistance | Soaking in 3% sulfuric acid solution for 24 hr | No obvious change of teeth | Superior food |
TABLE 1
Example two:
1. prepared were 150 parts by weight of copolyformaldehyde, 225 parts by weight of a toughening agent, 150 parts by weight of a crosslinking agent, 75 parts by weight of an antioxidant and 112.5 parts by weight of a lubricant.
2. The raw materials are fully stirred uniformly by a stirrer or subjected to injection molding tooth implantation treatment, injection molding is carried out on the raw materials at 190-220 ℃ to form injection molding zipper stacking, then the finished product zipper is obtained through the processing procedures of sizing, slider penetrating and upper and lower stop opening, and the performance of the obtained zipper is tested, and the results are shown in table 2.
| Item | Test method | Test results | Test determination |
| Horizontal tensile strength | QB/T 2172 | 550 | Superior food |
| Smoothness of horizontal drawing | QB/T 2172 | 80 | Superior food |
| Acid resistance | Soaking in 3% sulfuric acid solution for 24 hr | No obvious change of teeth | Youyou (an instant noodle) |
TABLE 2
Comparative example one:
1. 150 parts by weight of copolyformaldehyde, 225 parts by weight of a toughening agent, 150 parts by weight of a crosslinking agent and 75 parts by weight of an antioxidant are prepared, and a lubricant is not added.
2. The raw materials are fully stirred by a stirrer or subjected to injection molding tooth implanting treatment, injection molding is carried out on the raw materials at 190-220 ℃ to form injection molding zipper stacking, then the finished product zipper is obtained through the processing procedures of sizing, pulling head penetrating and upper and lower stop beating, and the performance test is carried out on the obtained zipper, and the result is shown in table 3.
| Item | Test method | Test results | Test determination |
| Horizontal tensile strength | QB/T 2172 | 510 | Youyou (an instant noodle) |
| Smoothness of horizontal drawing | QB/T 2172 | 60 | Difference between |
| Acid resistance | Soaking in 3% sulfuric acid solution for 24 hr | No obvious change of teeth | Superior food |
TABLE 3
Comparative example two:
1. 150 parts by weight of copolyoxymethylene, 225 parts by weight of a toughening agent, 150 parts by weight of a crosslinking agent and 112.5 parts by weight of a lubricant were prepared without adding an antioxidant.
2. The raw materials are fully stirred uniformly by a stirrer or subjected to injection molding tooth implantation treatment, injection molding is carried out on the raw materials at 190-220 ℃ to form injection molding zipper stacking, then the finished product zipper is obtained through the processing procedures of sizing, slider penetrating and upper and lower stop opening, and the performance of the obtained zipper is tested, and the results are shown in table 4.
| Item | Test method | Test results | Test determination |
| Horizontal tensile strength | QB/T 2172 | 480 | Difference (D) |
| Smoothness of horizontal drawing | QB/T 2172 | 80 | Good wine |
| Acid resistance | Soaking in 3% sulfuric acid solution for 24 hr | Tooth surface exfoliation | Difference (D) |
TABLE 4
Comparative example three:
1. 100 parts by weight of copolyoxymethylene, 100 parts by weight of a crosslinking agent, 50 parts by weight of an antioxidant and 75 parts by weight of a lubricant are prepared, and a toughening agent is not added.
2. The raw materials are fully stirred uniformly by a stirrer or subjected to injection molding tooth implantation treatment, injection molding is carried out on the raw materials at 190-220 ℃ to form injection molding zipper stacking, then the finished product zipper is obtained through the processing procedures of sizing, slider penetrating and upper and lower stop opening, and the performance of the obtained zipper is tested, and the results are shown in table 5.
| Item | Test method | Test results | Test determination |
| Horizontal tensile strength | QB/T 2172 | 400 | Difference (D) |
| Smoothness of horizontal drawing | QB/T 2172 | 60 | Difference (D) |
| Acid resistance | Soaking in 3% sulfuric acid solution for 24 hr | No obvious change of teeth | Superior food |
TABLE 5
As can be seen by referring to tables 1 to 5, in the examples provided in the present application, the zipper pull smoothness of the finished slide fastener was reduced when no lubricant was added, the zipper pull strength and acid resistance of the finished slide fastener were reduced when no antioxidant was added, and the zipper pull strength and zipper pull smoothness of the finished slide fastener were reduced when no toughening agent was added.
Referring to tables 1 and 2, it can be seen that in the examples provided in the present application, as the weight ratio of the added raw materials increases as a whole, the pull strength, the pull smoothness and the acid resistance of the finished slide fastener are significantly improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A shaping and injection molding process of an alphabetic plastic-resin zipper is characterized by comprising the following steps: the injection molding process comprises the following steps:
s1, mixing the polyformaldehyde, the flexibilizer, the crosslinking agent, the antioxidant and the lubricant according to the weight ratio of 1: 1.5: 1: 0.5: pouring 0.75 part by weight of the mixture into a reaction vessel, and uniformly stirring the mixture by a stirrer to obtain a mixed solution;
s2, heating the mixed solution obtained in the step S1, and then performing injection molding tooth implantation treatment on the heated stock solution to obtain a plastic particle processing raw material;
s3, selecting a certain amount of plastic particle processing raw materials to carry out injection molding surface treatment;
s4, selecting a certain amount of cloth bags to be attached to the outer part of the plastic particle processing raw material obtained after the step S3, and then carrying out injection molding internal treatment;
and S5, classifying the finished raw materials after the step S4 according to the opening and closing states, and packaging and warehousing the finished raw materials by a packaging machine.
2. The sizing injection molding process of the letter plastic-fat zipper according to claim 1, characterized in that: the weight portion of the copolyformaldehyde in the step S1 is 150-150, the weight portion of the toughening agent is 150-225, the weight portion of the crosslinking agent is 100-150, the weight portion of the antioxidant is 50-75 and the weight portion of the lubricant is 75-112.5.
3. The sizing injection molding process of the letter plastic-fat zipper according to claim 1, characterized in that: the toughening agent in the step S1 is emulsion styrene-butadiene rubber or powder styrene-butadiene rubber, the cross-linking agent is liquid bisphenol F type epoxy resin, the antioxidant is one or more of polyphenol antioxidant, phosphorous acid antioxidant and oxygen-containing agent sulfur antioxidant, and the lubricant is one of fatty acid amide or metal soap.
4. The sizing injection molding process of the letter plastic-fat zipper according to claim 1, characterized in that: the step of injection molding and tooth implanting in step S2 is to pour the stock solution subjected to the temperature increase treatment in step S2 into an extruder, and extrude the stock solution into a forming mold through the extruder, so as to obtain the plastic particle processing material.
5. The sizing injection molding process of the letter plastic-fat zipper according to claim 1, characterized in that: the injection molding surface treatment in step S3 includes:
polishing: polishing the outer surface of the plastic particle processing raw material to improve the surface smoothness of the plastic particle raw material;
sizing: and the dimension of the plastic particle raw material after polishing treatment is measured, so that the precision of a finished product is improved.
6. The sizing injection molding process of the letter plastic-fat zipper according to claim 1, characterized in that: the injection molding internal process in step S4 includes: and (4) performing tooth punching, head piercing, tooth punching and cutting treatment.
7. The sizing injection molding process of the letter plastic-fat zipper according to claim 1, characterized in that: in step S5, the baffle type sorting machine is used to assist workers in separating products.
8. An alphabet plastic zipper is characterized in that: which is manufactured by the molding injection molding process of the letter plastic zipper of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210228679.4A CN114591591A (en) | 2022-03-10 | 2022-03-10 | Letter plastic zipper and shaping injection molding process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210228679.4A CN114591591A (en) | 2022-03-10 | 2022-03-10 | Letter plastic zipper and shaping injection molding process thereof |
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| CN114591591A true CN114591591A (en) | 2022-06-07 |
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| CN202210228679.4A Pending CN114591591A (en) | 2022-03-10 | 2022-03-10 | Letter plastic zipper and shaping injection molding process thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109438929A (en) * | 2018-11-01 | 2019-03-08 | 驰马拉链（安徽）有限公司 | A kind of production technology of injection molding zipper |
| CN113604003A (en) * | 2021-08-25 | 2021-11-05 | 上海紫埠拉链有限公司 | Injection molding zipper composition, processing technology thereof and zipper teeth |
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- 2022-03-10 CN CN202210228679.4A patent/CN114591591A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109438929A (en) * | 2018-11-01 | 2019-03-08 | 驰马拉链（安徽）有限公司 | A kind of production technology of injection molding zipper |
| CN113604003A (en) * | 2021-08-25 | 2021-11-05 | 上海紫埠拉链有限公司 | Injection molding zipper composition, processing technology thereof and zipper teeth |
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