阅读说明：本技术 一种注塑拉链组合物及其加工工艺和拉链链牙 (Injection molding zipper composition, processing technology thereof and zipper teeth ) 是由 裴晓丽 于 2021-08-25 设计创作，主要内容包括：本申请涉及拉链加工技术领域,具体公开了一种注塑拉链组合物及其加工工艺和拉链链牙,注塑拉链组合物由包含以下重量份的原料制成,共聚甲醛100份、增韧剂1-3份、交联剂1-2份、抗氧化剂0.2-0.5份、润滑剂0.2-0.5份、甲醛吸收剂0.1-0.2份；所述增韧剂为改性粉末丁苯橡胶,所述改性粉末丁苯橡胶是丁苯乳胶经过N,N-亚甲基双丙烯酰胺改性得到。该注塑拉链组合物,通过原料之间的协同作用,使得其具有增强缺口抗冲击强度的同时,还能保持较高拉伸强度的优点。(The application relates to the technical field of zipper processing, and particularly discloses an injection molding zipper composition, a processing technology thereof and zipper teeth, wherein the injection molding zipper composition is prepared from the following raw materials, by weight, 100 parts of copolyoxymethylene, 1-3 parts of a toughening agent, 1-2 parts of a cross-linking agent, 0.2-0.5 part of an antioxidant, 0.2-0.5 part of a lubricant, and 0.1-0.2 part of a formaldehyde absorbent; the toughening agent is modified powder styrene-butadiene rubber, and the modified powder styrene-butadiene rubber is obtained by modifying styrene-butadiene latex through N, N-methylene bisacrylamide. The injection molding zipper composition has the advantages that the impact strength of the notch is enhanced and the higher tensile strength can be kept through the synergistic effect of the raw materials.)

1. An injection-molded slide fastener composition characterized in that,

the injection molding zipper composition comprises the following raw materials in parts by weight: 100 parts of copolyformaldehyde, 1-3 parts of flexibilizer, 1-2 parts of crosslinking agent, 0.2-0.5 part of antioxidant, 0.2-0.5 part of lubricant and 0.1-0.2 part of formaldehyde absorbent;

the toughening agent is modified powder styrene-butadiene rubber, and the modified powder styrene-butadiene rubber is obtained by modifying styrene-butadiene latex through N, N-methylene bisacrylamide.

2. An injection molded zipper composition as in claim 1, wherein the cross-linking agent is bisphenol F epoxy resin.

3. An injection molded zipper composition according to claim 1, wherein the modified powdered styrene-butadiene rubber is prepared by the following method:

s1: the preparation method comprises the following raw materials in parts by weight: uniformly mixing 180 parts of water 100-plus-oil, 100 parts of styrene-butadiene latex and 90-160 parts of N, N-methylene-bisacrylamide;

s2: heating to 40-60 deg.C^oC, stirring and reacting for 5-7h to obtain modified styrene-butadiene latex;

s3: taking 50 parts of modified styrene-butadiene latex, adding 30-70 parts of water and 4-6 parts of coagulant into the mixture, and adding the mixture into the mixture at a temperature of 50-80 DEG C^oStirring for 30-50min at the temperature of C;

s4: and dehydrating and drying to obtain the modified powdered styrene butadiene rubber.

4. An injection moulded zipper composition as claimed in claim 3, wherein the coagulant is NaCl and CaCl₂One kind of (1).

5. An injection moulded zipper composition as claimed in claim 1, wherein the antioxidant is one or more of a polyphenol antioxidant, a phosphorous acid antioxidant, a sulphur containing antioxidant.

6. An injection molding zipper composition as claimed in claim 5, wherein the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, and the weight ratio is 1 (0.5-0.8).

7. An injection molded zipper composition as in claim 1, wherein the formaldehyde absorbent is one of dicyandiamide or melamine.

8. A process for the manufacture of an injection moulded zipper composition as claimed in any one of claims 1 to 7, comprising the steps of:

a: uniformly mixing the co-polyoxymethylene, the modified powdered styrene-butadiene rubber, the formaldehyde absorbent, the cross-linking agent, the antioxidant and the lubricant to obtain a mixture;

b: and heating the mixture to 160-180 ℃, and then extruding and granulating to obtain the injection molding zipper composition.

9. A fastener element obtained by injection molding the injection-molded fastener composition according to any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of zipper processing, in particular to an injection molding zipper composition, a processing technology thereof and zipper teeth.

Background

At present, the injection molded zippers at home and abroad mostly adopt the copolyformaldehyde as a raw material. The zipper prepared from the copolyoxymethylene has excellent mechanical strength, wear resistance, creep resistance and other properties. However, the polyformaldehyde has the defect of poor toughness, and the notch impact resistance of the zipper made of the polyformaldehyde is poor. So that the zipper obtained by injection molding of the copolyformaldehyde can often cause tooth dropping when being used for clothes and bags.

In the related art, in order to enhance the toughness of the paraformaldehyde and thus 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 research on a zipper composition which can improve the notch impact resistance without reducing the tensile strength is urgent.

Disclosure of Invention

In order to enhance the notch impact resistance of the paraformaldehyde without reducing the tensile strength of the paraformaldehyde, the application provides an injection molding zipper composition, a processing technology thereof and a zipper tooth.

In a first aspect, the present application provides an injection molded zipper composition, which adopts the following technical scheme:

an injection molding zipper composition is composed of the following raw materials in parts by weight: 100 parts of copolyformaldehyde, 1-3 parts of flexibilizer, 1-2 parts of crosslinking agent, 0.2-0.5 part of antioxidant, 0.2-0.5 part of lubricant and 0.1-0.2 part of formaldehyde absorbent;

the toughening agent is modified powder styrene-butadiene rubber, and the modified powder styrene-butadiene rubber is obtained by modifying styrene-butadiene latex through N, N-methylene bisacrylamide.

By adopting the technical scheme, the injection molding zipper composition has higher notch impact strength and tensile strength, and the notch impact strength range is 13.2-14.3KJ/m²The tensile strength range is 53.97-54.6MPa, compared with the injection molding zipper composition without the toughening agent and the crosslinking agent, the notch impact strength and the tensile strength of the injection molding zipper composition are improved, the increase rate of the notch impact strength ranges from 40.13% to 51.80%, the increase rate of the tensile strength ranges from 1.73% to 2.92%, and the injection molding zipper composition not only improves the notch impact strength of the zipper composition, but also improves the tensile strength of the zipper composition.

The polyformaldehyde is used as a raw material with excellent performance of the injection molding zipper, the modified powder styrene-butadiene rubber is used as a toughening agent to improve the notch impact resistance and tensile strength of the copolyoxymethylene, a synergistic effect exists between the crosslinking agent and the toughening agent, the notch impact resistance of the copolyoxymethylene is further improved under the condition of not reducing the tensile strength of the copolyoxymethylene, the antioxidant can improve the thermal stability of the copolyoxymethylene, so that the processing stability of the injection molding zipper composition is improved, meanwhile, the antioxidant plays an important role in maintaining the mechanical performance of the injection molding zipper composition and slowing down the later accelerated degradation process, the lubricant can reduce the friction between the injection molding zipper composition and metal equipment, and can delay the plasticization of the injection molding zipper composition, and the formaldehyde absorbent can absorb the formaldehyde generated in the processing process of the injection molding zipper composition, thereby reduce the harm of formaldehyde to the human body and to the pollution of environment, the zip fastener composition of moulding plastics of this application not only can keep the mechanical strength of the zip fastener composition of moulding plastics through the synergistic effect between each raw materials, has still improved its breach shock resistance simultaneously, satisfies the market demand.

Optionally, the cross-linking agent is bisphenol F epoxy resin.

By adopting the technical scheme, the bisphenol F epoxy resin contains a plurality of hydroxyl groups and benzene rings, the hydroxyl groups can form hydrogen bonds with oxygen atoms in the copolyoxymethylene, meanwhile, the benzene rings and the benzene rings of the modified powder styrene butadiene rubber have pi-pi stacking weak interaction, and the hydrogen bonds and the pi-pi stacking enhance intermolecular force, so that the notch impact strength and the tensile strength of the injection molding zipper composition are enhanced.

Optionally, the modified powdered styrene-butadiene rubber is prepared by the following method:

s1: the preparation method comprises the following raw materials in parts by weight: uniformly mixing 180 parts of water 100-plus-oil, 100 parts of styrene-butadiene latex and 90-160 parts of N, N-methylene-bisacrylamide;

s2: heating to 40-60 ℃, stirring, and reacting for 5-7h to obtain modified styrene-butadiene latex;

s3: taking 50 parts of modified styrene-butadiene latex, adding 30-70 parts of water and 4-6 parts of coagulant, and stirring at 50-80 ℃ for 30-50 min;

s4: and dehydrating and drying to obtain the modified powdered styrene butadiene rubber.

By adopting the technical scheme, the modified powdered styrene butadiene rubber is simple and easy to obtain and operate.

Optionally, the coagulant is NaCl and CaCl₂One kind of (1).

By adopting the technical scheme, NaCl and CaCl are adopted₂Is cheap and easily available.

Optionally, the antioxidant is one or more of a polyphenol antioxidant, a phosphorous acid antioxidant and a sulfur-containing antioxidant.

By adopting the technical scheme, the polyphenol antioxidant, the phosphorous acid antioxidant and the sulfur-containing antioxidant are common antioxidants in the copolyoxymethylene, and the raw materials are easy to obtain.

Optionally, the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168, and the weight ratio of the antioxidant is 1 (0.5-0.8).

By adopting the technical scheme, the antioxidant 1010 and the antioxidant 168 both play a good role in improving the thermal stability of the injection molding zipper composition, compared with the single use of the antioxidant 1010 and the antioxidant 168, the mixture of the antioxidant 1010 and the antioxidant 168 has a larger enhancement range on the notch impact strength and the tensile strength of the injection molding zipper composition, and a synergistic effect exists between the antioxidant 1010 and the antioxidant 168, wherein the antioxidant 1010 is a polyphenol antioxidant, the antioxidant 168 is a phosphorous acid antioxidant, the antioxidant 1010 is a main antioxidant, and the antioxidant 168 is an auxiliary antioxidant, so that the thermal stability of the injection molding zipper composition is more excellent, and meanwhile, the notch impact resistance and the tensile strength of the injection molding zipper composition are further improved.

Optionally, the formaldehyde absorbent is one of dicyandiamide or melamine.

By adopting the technical scheme, the dicyandiamide and the melamine are simple and easily obtained in raw materials, and have a good effect of absorbing formaldehyde.

In a second aspect, the present application provides a processing technology of an injection molding zipper composition, which adopts the following technical scheme: a processing technology of an injection molding zipper composition comprises the following steps:

a: uniformly mixing the co-polyoxymethylene, the modified powdered styrene-butadiene rubber, the formaldehyde absorbent, the cross-linking agent, the antioxidant and the lubricant to obtain a mixture;

b: and heating the mixture to 160-180 ℃, and then extruding and granulating to obtain the injection molding zipper composition.

By adopting the technical scheme, the processing process of the injection molding zipper composition is simple and stable.

In a third aspect, the present application provides a zipper tooth, which adopts the following technical scheme:

a zipper tooth is prepared from injection molding zipper composition by injection molding process.

By adopting the technical scheme, the zipper teeth have higher impact resistance and tensile strength, and are not easy to fall off and damaged when being subjected to external force.

In summary, the present application has at least the following beneficial effects:

1. according to the injection molding zipper composition, the modified powder styrene-butadiene rubber is used as the toughening agent, so that the tensile strength of the injection molding zipper composition is enhanced while the notch impact strength of the injection molding zipper composition is enhanced, and the crosslinking agent is added at the same time, so that the synergistic effect exists between the crosslinking agent and the toughening agent, the notch impact strength of the injection molding zipper composition is further improved while the tensile strength of the injection molding zipper composition is not reduced;

2. bisphenol F epoxy resin is used as a cross-linking agent, and N, N-methylene bisacrylamide is used to obtain modified powdered styrene-butadiene rubber, so that a plurality of hydrogen bonds are formed among hydroxyl in the bisphenol F epoxy resin, imino in the modified powdered styrene-butadiene rubber and oxygen atoms of the co-formaldehyde, and pi-pi stacking weak interaction exists between a benzene ring in the bisphenol F epoxy resin and the modified powdered styrene-butadiene rubber, so that intermolecular force is greatly enhanced, and the notch impact strength and the tensile strength of the injection molding zipper composition are improved.

Detailed Description

The present invention will be described in further detail with reference to examples.

Raw materials

The copolyformaldehyde is selected from Xinshun county gold chemical engineering Limited company; the bisphenol F epoxy resin is selected from Pander (Shanghai) International trade company; antioxidant 1010 is selected from BASF brand; the antioxidant 168 is selected from Shunfan New Material, LLC of Guangzhou city; the antioxidant 300 is selected from New Material Co., Ltd, Jieko, Foshan; the styrene-butadiene latex is selected from Yangzhou Tianda chemical company; the liquid paraffin is selected from environment-friendly science and technology limited of Jindenwan Wandefeng; the powdered styrene-butadiene rubber has SH-600 model and is selected from Shanghai Plastic materials Co., Ltd of Dongguan; the polyurethane elastomer is model WHT-1480 and is selected from Yingcang plastifying Co., Ltd.

Preparation example

TABLE 1 modified powdered styrene-butadiene rubber in preparation examples 1 to 5 in content (kg) of each raw material

Preparation example 1

The raw material content of the modified powdered styrene-butadiene rubber is shown in Table 1.

A modified powdered styrene-butadiene rubber is prepared by adopting the following method:

step S1: adding water, styrene-butadiene latex and N, N-methylene bisacrylamide into a 500L polymerization kettle to obtain a mixture;

step S2: heating the mixture to 50 ℃, and stirring for 6 hours to obtain modified styrene butadiene rubber;

step S3: adding modified styrene butadiene rubber into a 200L condensation kettle, starting stirring, adding water into the system, heating to 70 ℃, then adding a calcium chloride coagulant into the condensation kettle, and stirring for 40min to obtain a modified powder styrene butadiene rubber suspension;

step S4: and (3) dehydrating the modified powder styrene butadiene rubber suspension by using a centrifugal machine, and drying in a vacuum drying oven to obtain the modified powder styrene butadiene rubber.

Preparation examples 2 to 5

A modified powdered styrene-butadiene rubber which is different from that of preparation example 1 in the content of each raw material of the modified powdered styrene-butadiene rubber, and the specific content of each raw material is shown in Table 1.

Preparation example 6

A modified powdered styrene-butadiene rubber which is different from that in production example 3 in that the coagulant is sodium chloride.

TABLE 2 preparation conditions of modified powdered styrene-butadiene rubbers in preparation example 3 and preparation examples 7 to 8

Preparation examples 7 to 8

A modified powdered styrene-butadiene rubber which is different from that of preparation example 3 in the processing conditions shown in Table 2 was obtained.

Examples

TABLE 3 raw material contents (kg) of injection molded fastener compositions of examples 1 to 5

Raw materials	Example 1	Example 2	Example 3	Example 4	Example 5
						Copolyformaldehyde	100	100	100	100	100
Modified powdered styrene-butadiene rubber	1	2.5	2	1.5	3
						Crosslinking agent	1	1.3	1.7	1.5	2
Antioxidant agent	0.3	0.4	0.2	0.45	0.5
						Lubricant agent	0.2	0.3	0.4	0.45	0.5
Formaldehyde absorbent	0.1	0.12	0.17	0.15	0.2

Example 1

An injection-molded slide fastener composition whose raw material contents are shown in Table 3.

And modified powdered styrene-butadiene rubber was provided from preparation example 3.

The cross-linking agent is bisphenol F epoxy resin, the antioxidant is a polyphenol antioxidant, specifically an antioxidant 1010, the lubricant is liquid paraffin, and the formaldehyde absorbent is melamine.

A processing technology of an injection molding zipper composition comprises the following steps:

adding the co-polymerized formaldehyde, the modified powder styrene-butadiene rubber, the formaldehyde absorbent, the cross-linking agent, the antioxidant and the lubricant into a stirrer, and stirring for 30-50min to obtain a mixture;

and adding the mixture into a double-screw plastic granulator, and extruding and granulating, wherein the model of the plastic granulator is SX-125 type son-mother machine. The barrel temperature was 170 ℃ and the screw speed was 140 rpm.

Examples 2 to 5

An injection-molded slide fastener composition was different from example 1 in the content of each raw material of the injection-molded slide fastener composition, as shown in Table 3.

Example 6

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided from production example 1.

Example 7

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided from preparation example 2.

Example 8

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided from preparation example 4.

Example 9

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided from production example 5.

Example 10

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided by production example 6.

Example 11

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided by production example 7.

Example 12

An injection-molded slide fastener composition which is different from example 4 in that a modified powdered styrene-butadiene rubber was provided by production example 8.

Example 13

An injection-molded slide fastener composition which is different from example 4 in that the antioxidant is antioxidant 168.

Example 14

An injection-molded zipper composition which is different from example 4 in that the antioxidant is antioxidant 300.

Example 15

An injection-molded zipper composition, which is different from that of example 4 in that the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168, and the weight ratio of the antioxidant 1010 to the antioxidant 168 is 1: 0.5.

Example 16

An injection-molded zipper composition, which is different from that of example 4 in that the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168, and the weight ratio of the antioxidant 1010 to the antioxidant 168 is 1: 0.7.

Example 17

An injection-molded zipper composition, which is different from that of example 4 in that the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168, and the weight ratio of the antioxidant 1010 to the antioxidant 168 is 1: 0.8.

Example 18

An injection-molded slide fastener composition which is different from that in example 16 in that dicyandiamide was used as the formaldehyde absorbent.

Example 19

An injection-molded slide fastener composition which is different from that in example 16 in that the cylinder temperature of the twin-screw plastic pelletizer was 160 ℃.

Example 20

An injection-molded slide fastener composition which is different from that in example 16 in that the cylinder temperature of the twin-screw plastic pelletizer was 180 ℃.

Example 21

An injection-molded slide fastener composition which is different from example 16 in that the screw rotation speed of the twin-screw plastic pelletizer is 120 rpm.

Example 22

An injection-molded slide fastener composition which is different from example 16 in that the screw rotation speed of the twin-screw plastic pelletizer is 160 rpm.

Application example

Application example 1

A zipper tooth is prepared by the following method:

step Sa, color matching is carried out on the injection molding zipper composition by adopting a color master batch method;

and step Sb, adding the injection molding zipper composition after color matching into a POM injection molding machine, and performing injection molding in a plastic injection molding mode to obtain zipper teeth, wherein the injection molding temperature is 180 ℃, the injection molding pressure is 120MPa, and the injection rate is 8 m/s.

Comparative example

Comparative example 1

An injection-molded slide fastener composition which is different from example 16 in that no crosslinking agent or toughening agent was added.

Comparative example 2

An injection-molded slide fastener composition which is different from example 16 in that no crosslinking agent was added and an equal amount of polyurethane elastomer was used as a toughening agent in place of the modified powdered styrene-butadiene rubber.

Comparative example 3

An injection-molded slide fastener composition which is different from example 16 in that no crosslinking agent was added and an equivalent amount of powdered styrene-butadiene rubber was used in place of the modified powdered styrene-butadiene rubber as a toughening agent.

Comparative example 4

An injection-molded slide fastener composition which is different from example 16 in that no crosslinking agent was added.

Comparative example 5

An injection-molded slide fastener composition which is different from example 16 in that no toughening agent was added.

Comparative example 6

An injection-molded slide fastener composition which is different from example 16 in that an equivalent amount of powdered styrene-butadiene rubber was used as a toughening agent in place of the modified powdered styrene-butadiene rubber.

Performance test

The injection-molded zipper compositions obtained in examples 1 to 26 and comparative examples 1 to 6 were respectively prepared as test specimens to be tested for the following properties, and the test results are shown in Table 4. Wherein comparative example 1 is a blank control.

According to the national standard GB/T1040.2-2006, an electronic universal mechanical testing machine is used for carrying out tensile testing;

according to the national standard GB1843-92, a simple beam impact tester is adopted to carry out notch impact resistance test on a notch injection molding zipper composition sample.

TABLE 4 notched Izod impact Strength and growth thereof, tensile Strength and growth thereof of examples 1 to 22 and comparative examples 1 to 6

As shown in comparative example 1 in Table 4, when no crosslinking agent was added and no toughening agent was added, the notched impact strength of the injection-molded slide fastener composition was 9.42KJ/m²The tensile strength was 53.05 MPa. As shown in examples 1 to 22 in Table 3, the injection-molded slide fastener compositions obtained by adding the crosslinking agent and simultaneously adding the toughening agent had high notched impact strengths and tensile strengths in the range of 13.2 to 14.3KJ/m²The growth rate ranged from 40.13% to 51.80% compared to comparative example 1, and the tensile strength ranged from 53.97 to 54.6MPa, and the growth rate ranged from 1.73% to 2.92% compared to comparative example 1. Wherein the injection-molded zipper composition obtained in example 16 was the most excellent in notched impact strength, and the impact strength was 14.3KJ/m²The growth rate was 51.80%. Meanwhile, the tensile strength of the injection molded slide fastener composition obtained in example 16 was 54.02, and the growth rate was 1.83%. The modified powder styrene-butadiene rubber is used as a toughening agent, and the bisphenol F epoxy resin is used as a crosslinking agent, so that the notch impact strength and the tensile strength of the injection molding zipper composition are increased.

As shown in comparative example 1 and comparative example 2 in Table 4, when a polyurethane elastomer was used as a toughening agent, the notched impact strength was 10.6KJ/m²The growth rate is 12.53%; the tensile strength is 45.33MPa, and the growth rate is-14.55%. Indicating that the polyurethane elastomer is capable of reinforcing the paraformaldehydeNotched impact resistance but at the same time greatly reduced its tensile strength.

As shown in comparative example 3 of Table 4, the injection-molded slide fastener composition had a notched impact strength of 11.8KJ/m when a powdered styrene-butadiene rubber was used as a toughening agent²The growth rate is 25.27%; the tensile strength is 52.24MPa, and the growth rate is-1.53%. Compared with polyurethane elastomer, the powder styrene-butadiene rubber not only further improves the shock resistance of the copolyoxymethylene, but also only reduces the tensile strength of the copolyoxymethylene by 1.53 percent. Compared with polyurethane elastomer, the powdered styrene butadiene rubber can greatly improve the notch impact strength of the injection molding zipper composition and reduce the pull-up strength of the injection molding zipper composition.

As shown in comparative example 4 in Table 4, the modified powdered styrene-butadiene rubber was used as a toughening agent without adding a crosslinking agent. The notched impact strength of the injection-molded slide fastener composition was 13.6KJ/m²The growth rate is 44.37%; the tensile strength was 54.21MPa, and the elongation was 2.19%. Compared with the comparative example 3 in which the powdered styrene-butadiene rubber is used as the toughening agent, the modified powdered styrene-butadiene rubber enables the impact resistance of the injection molding zipper composition to be further improved and the tensile strength to be improved.

Double bonds, imino groups and carbonyl groups exist in the N, N-methylene bisacrylamide, double bonds exist in the main chain of the styrene-butadiene latex, and the N, N-methylene bisacrylamide and the styrene-butadiene latex react under certain reaction conditions, so that the N, N-methylene bisacrylamide is effectively embedded into the main chain of the styrene-butadiene latex, and the modified styrene-butadiene latex is obtained. The modified styrene-butadiene latex is subjected to certain conditions to obtain modified powdered styrene-butadiene rubber. Compared with the powder styrene-butadiene rubber, the modified powder styrene-butadiene rubber has a plurality of branched chains, and the branched chains contain carbonyl and imino. The imino can form a hydrogen bond with oxygen atoms in the copolyoxymethylene, the intermolecular force is increased, and the copolyoxymethylene can form a three-dimensional network structure with the modified powder styrene-butadiene rubber, so that the modified powder styrene-butadiene rubber has a more remarkable toughening effect on the copolyoxymethylene compared with the powder styrene-butadiene rubber, and the tensile strength is increased due to the increase of the intermolecular force.

As shown in comparative example 5 of table 4,when bisphenol F epoxy resin is used as a crosslinking agent and no toughening agent is added, the notch impact strength of the injection molding zipper composition is 11.6KJ/m²The growth rate is 23.14%; the tensile strength was 53.71MPa, and the growth rate was 1.24%. The cross-linking agent has small reinforcing range on the notch impact strength of the injection molding zipper composition, and the tensile strength is increased.

The hydroxyl in the bisphenol F epoxy resin and the oxygen atom of the copolyoxymethylene form a hydrogen bond, and the notch impact strength and the tensile strength of the copolyoxymethylene are further increased.

As shown in comparative example 6 in Table 4, when bisphenol F epoxy resin was used as the crosslinking agent and powdered styrene-butadiene rubber was used as the toughening agent at the same time, the notched impact strength of the injection-molded slide fastener composition was 12.6KJ/m²The growth rate is 33.76%; the tensile strength is 53.61MPa, and the growth rate is 1.06%. Compared with comparative example 3, the addition of the crosslinking agent further improves the notched impact resistance of the injection-molded zipper composition, and improves the tensile strength of the injection-molded zipper composition. The synergistic effect between the cross-linking agent and the powdered styrene-butadiene rubber is shown.

The bisphenol F epoxy resin has a structure with a plurality of benzene rings and a plurality of hydroxyl groups. The hydroxyl can form a hydrogen bond with an oxygen atom in the copolyoxymethylene; meanwhile, the benzene ring in the bisphenol F epoxy resin and the benzene ring in the powdered styrene-butadiene rubber have pi-pi stacking weak interaction, and the hydrogen bond and the pi-pi stacking increase the intermolecular force. And the copolyformaldehyde, the bisphenol F epoxy resin and the powdered styrene butadiene rubber form a large net structure with a three-dimensional structure, so that the impact strength of the injection molding zipper composition is further improved, and the tensile strength is improved.

As shown in example 16 of Table 4, the injection-molded slide fastener composition had a notched impact strength of 14.3KJ/m, using bisphenol F epoxy resin as a crosslinking agent and modified powdered styrene-butadiene rubber as a toughening agent at the same time²The growth rate is 51.80%; the tensile strength is 54.02MPa, and the growth rate is 1.83 percent. The impact strength was further improved compared to comparative examples 4 and 5. Shows the synergistic effect between the cross-linking agent and the modified powdered styrene-butadiene rubber, compared with the method of only adding the cross-linking agent or only adding the modified powdered styrene-butadiene rubberThe impact resistance of the injection molded slide fastener composition can be further improved.

Double bonds, imino groups and carbonyl groups exist in the N, N-methylene bisacrylamide, double bonds exist in the main chain of the styrene-butadiene latex, and the N, N-methylene bisacrylamide and the styrene-butadiene latex react under certain reaction conditions, so that the N, N-methylene bisacrylamide is effectively embedded into the main chain of the styrene-butadiene latex, and the modified styrene-butadiene latex is obtained. The modified styrene-butadiene latex is subjected to certain conditions to obtain modified powdered styrene-butadiene rubber. Compared with the powder styrene-butadiene rubber, the modified powder styrene-butadiene rubber has a plurality of branched chains, and the branched chains contain carbonyl and imino. The bisphenol F epoxy resin has a structure with a plurality of benzene rings and a plurality of hydroxyl groups. A plurality of hydrogen bonds can be formed among imino, carbonyl, hydroxyl and oxygen atoms respectively; meanwhile, the benzene ring in the bisphenol F epoxy resin and the benzene ring in the modified powder styrene-butadiene rubber have a pi-pi stacking weak interaction. The hydrogen bond and the pi-pi accumulation obviously enhance the intermolecular acting force in the system, and simultaneously, the copolyoxymethylene, the bisphenol F epoxy resin and the modified styrene butadiene rubber form a large net structure with a three-dimensional structure, so that the impact strength of the injection molding zipper composition is further improved, and the tensile strength of the injection molding zipper composition is also improved.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.