Hot melt adhesive for irrigation water hose, preparation method of hot melt adhesive and irrigation water hose

Abstract

The invention relates to the technical field of binding materials, in particular to a hot melt adhesive for an irrigation hose, a preparation method of the hot melt adhesive and the irrigation hose. The hot melt adhesive for the irrigation hose comprises the following components in parts by weight: 10-30 parts of tackifying resin, 25-40 parts of EVA (Ethylene Vinyl Acetate) resin, 15-40 parts of styrene block copolymer, 10-20 parts of PMV (Polymethyl Vinyl Vinyl) resin and 0.1-2 parts of auxiliaries, the content of maleic anhydride in the PMV resin is 10%-50%; the weight-average molecular weight of the PMV resin is in a range of 100000 to 300000. According to the hot melt adhesive disclosed by the invention, the PMV resin is introduced and is matched with the tackifying resin, the EVA resin and the styrene block copolymer, so that the bonding strength of the hot melt adhesive to aromatic hydrocarbon is improved, the weather resistance such as heat resistance, water resistance and ultraviolet resistance is also improved, and meanwhile, the mechanical property of the hot melt adhesive is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of bonding materials, in particular to a hot melt adhesive for an irrigation water hose and a preparation method thereof and an irrigation water hose. Background Art

[0002] Aramid-based polyethylene lined water hose is currently a commonly used irrigation water hose, and the layers are bonded by adhesive materials. There are currently two main types of glue used in the field of building waterproofing. One is asphalt-based self-adhesive glue made from synthetic rubber such as SBS, tackifiers and petroleum asphalt, and the other is non-asphalt-based self-adhesive glue made from synthetic rubber such as SIS, tackifiers and additives. Asphalt-based self-adhesive glue has self-healing properties and good bonding properties, but its aging resistance is poor. Non-asphalt-based self-adhesive glue is a new type of environmentally friendly polymer waterproof material with good mechanical properties and easy construction. However, due to the lack of polar groups and poor water resistance of styrene block copolymers such as SIS, their bonding properties are insufficient, which affects the service life of the building.

[0003] The Chinese patent application with publication number CN107189732A discloses a highly weather-resistant thermoplastic polyolefin waterproof coiled material hot melt pressure-sensitive adhesive, which uses an acrylic crosslinking agent to graft SIS elastomer and polyisoprene rubber to reduce the number of double bonds in the elastomer material, improve adhesion and weather resistance, and uses amorphous olefin copolymer APAO and polyisoprene rubber to improve adhesion performance. The Chinese patent application with publication number CN114262586A discloses an antibacterial EVA edge-sealing hot melt adhesive material, which uses EVA, SIS, tackifying resin and other components to improve adhesion performance. Although these hot melt adhesives have improved weather resistance to a certain extent, their adhesion to aramid materials is still poor, which seriously limits the performance of aramid-based polyethylene lined water hoses.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] One object of the present invention is to provide a hot melt adhesive for irrigation hoses, which has excellent bonding properties to aramid and excellent weather resistance.

[0006] Another object of the present invention is to provide a method for preparing hot melt adhesive for irrigation hoses.

[0007] Another object of the present invention is to provide an irrigation hose comprising the above-mentioned hot melt adhesive.

[0008] In order to achieve the above-mentioned object of the present invention, the present invention provides a hot melt adhesive for irrigation water hoses, comprising the following components by weight: 10 to 30 parts of tackifying resin, 25 to 40 parts of EVA resin, 15 to 40 parts of styrene block copolymer, 10 to 20 parts of PMV resin and 0.1 to 2 parts of auxiliary agent; The content of maleic anhydride in the PMV resin is 10% to 50%; the weight average molecular weight of the PMV resin is 100,000 to 300,000.

[0009] In a specific embodiment of the present invention, the hot melt adhesive for irrigation hoses comprises the following components by weight: 25-30 parts of tackifying resin, 35-40 parts of EVA resin, 20-30 parts of styrene block copolymer, 10-15 parts of PMV resin and 0.1-2 parts of auxiliary agent.

[0010] In a specific embodiment of the present invention, the mass ratio of the PMV resin to the tackifying resin is 1:(1.5-3), further 1:(2.5-3).

[0011] In a specific embodiment of the present invention, the VA content in the EVA resin is 12% to 28%. Furthermore, the melt index of the EVA resin under the conditions of 2.16 kg and 10 min is 1 to 7 g / 10 min.

[0012] In a specific embodiment of the present invention, the styrene block copolymer includes at least one of SIS, SBS, SEBS and SSBR.

[0013] In a specific embodiment of the present invention, the tackifying resin includes at least one of hydrogenated C5 tackifying resin, hydrogenated C9 tackifying resin, hydrogenated rosin resin and DCPD hydrogenated resin.

[0014] In a specific embodiment of the present invention, the auxiliary agent includes at least one of an antioxidant and an anti-ultraviolet agent. Further, the auxiliary agent includes 0.1 to 1 part of antioxidant and 0.5 to 1 part of anti-ultraviolet agent by weight.

[0015] In another aspect of the present invention, a method for preparing any one of the above-mentioned hot melt adhesives for irrigation hoses is provided, comprising the following steps: mixing the components in proportion, performing melt extrusion granulation, and obtaining the hot melt adhesive.

[0016] In a specific embodiment of the present invention, in the melt extrusion granulation, the temperature of the extruder is 80-150°C.

[0017] Another aspect of the present invention provides an irrigation hose, comprising any one of the above-mentioned hot melt adhesives for irrigation hoses.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) In the hot melt adhesive of the present invention, PMV resin is introduced and combined with tackifying resin, EVA resin and styrene block copolymer, which improves the bonding strength of the hot melt adhesive to aromatic hydrocarbons while also improving the heat resistance, water resistance and weather resistance such as UV resistance, while ensuring the mechanical properties of the hot melt adhesive; (2) The irrigation hose prepared by the hot melt adhesive of the present invention has excellent bonding properties to the aramid-based polyethylene lining, thereby extending the service life of the aramid-based polyethylene lining hose. DETAILED DESCRIPTION

[0019] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0020] In one aspect, the present invention provides a hot melt adhesive for irrigation hoses, comprising the following components by weight: 10 to 30 parts of a tackifying resin, 25 to 40 parts of an EVA resin, 15 to 40 parts of a styrene block copolymer, 10 to 20 parts of a PMV resin, and 0.1 to 2 parts of an auxiliary agent; In the PMV resin, the content of maleic anhydride is 10% to 50%; the weight average molecular weight of the PMV resin is 100,000 to 300,000.

[0021] A certain amount of vinyl acetate-maleic anhydride copolymer (PMV) resin is added to the hot melt adhesive of the present invention, and an appropriate amount of polar groups are introduced into the hot melt adhesive system to improve the wettability of the hot melt adhesive to aramid and form a certain chemical bond with the aramid to ensure the bonding performance; at the same time, a certain amount of ethylene-vinyl acetate copolymer (EVA) resin, styrene block copolymer and tackifying resin are compounded to make the hot melt adhesive have suitable strength and toughness, so that the hot melt adhesive has better environmental adaptability.

[0022] Although the introduction of PMV resin can introduce polar groups and improve the wettability and bonding properties of aramid, the inventors of the present invention have found that in the hot melt adhesive system of the present invention, when the amount of PMV resin is too low, the number of polar groups introduced is insufficient, and the improvement of wettability and bonding properties is not obvious; when the amount of PMV resin is too high, the interaction between the molecular chains of the hot melt adhesive is enhanced and the crosslinking degree of the system is too high, which reduces the flexibility of the molecular chains of the hot melt adhesive system and affects its bonding performance, toughness and processing performance. In the present invention, the amount of PMV resin is adjusted within the above range, and the combination with the other components is more conducive to taking into account the bonding performance, mechanical properties and weather resistance of the hot melt adhesive.

[0023] For example, in different embodiments, the amounts of the components in the hot melt adhesive for irrigation hoses can be as follows, measured by weight: The amount of the tackifying resin can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts or a range consisting of any two of them; The amount of EVA resin can be 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts or a range consisting of any two of them; The amount of the styrene block copolymer can be 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or a range consisting of any two thereof; The amount of PMV resin can be 10 parts, 12 parts, 15 parts, 18 parts, 20 parts or a range consisting of any two of them; The dosage of the auxiliary agent can be 0.1 part, 0.5 part, 1 part, 1.5 parts, 2 parts or a range consisting of any two of them.

[0024] The use of PMV resin with a certain content of maleic anhydride is helpful to coordinate with the other components. When the appropriate amount of PMV resin is added, sufficient polar groups are introduced into the hot melt adhesive system to ensure the bonding condition. When the content of maleic anhydride in the PMV resin is too low, the improvement of the bonding performance is insufficient; when the content of maleic anhydride in the PMV resin is too high, on the one hand, the raw material cost is high, and on the other hand, the processing performance of the hot melt adhesive is affected. For example, in different embodiments, the content of maleic anhydride in the PMV resin can be 10%, 15%, 20%, 30%, 40%, 50% or a range consisting of any two thereof; the weight average molecular weight of the PMV resin can be 100000, 120000, 150000, 180000, 200000, 220000, 250000, 280000, 300000 or a range consisting of any two thereof.

[0025] In a specific embodiment of the present invention, the hot melt adhesive for irrigation hoses includes the following components by weight: 25-30 parts of tackifying resin, 35-40 parts of EVA resin, 20-30 parts of styrene block copolymer, 10-15 parts of PMV resin and 0.1-2 parts of auxiliary agent.

[0026] In a specific embodiment of the present invention, the mass ratio of the PMV resin to the tackifying resin is 1:(1.5-3), further 1:(2.5-3).

[0027] The present invention regulates the amount of PMV resin and tackifying resin within the above range to further improve the bonding performance of the hot melt adhesive to aramid, weather resistance, and strength and toughness of the hot melt adhesive. For example, in different embodiments, the mass ratio of PMV resin to tackifying resin can be 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, 1:2.8, 1:3, or a range consisting of any two of them.

[0028] In a specific embodiment of the present invention, the VA content in the EVA resin is 12% to 28%. Furthermore, the melt index of the EVA resin under the conditions of 2.16 kg and 10 min is 1 to 7 g / 10 min.

[0029] The use of EVA resin that meets the above conditions can be combined with other components to improve the bonding performance of the hot melt adhesive, while ensuring heat resistance and avoiding slippage at 80°C. For example, in different embodiments, the VA content in the EVA resin can be 12%, 16%, 18%, 20%, 24%, 28% or a range consisting of any two thereof; the melt index of the EVA resin 2.16kg / 10min can be 1g / 10min, 3g / 10min, 5g / 10min, 7g / 10min or a range consisting of any two thereof.

[0030] In a specific embodiment of the present invention, the styrene block copolymer includes at least one of SIS, SBS, SEBS and SSBR.

[0031] In a specific embodiment of the present invention, in the styrene block copolymer, the content of the diblock is ≥ 25wt%, such as 25wt%, 30wt%, 40wt%, 50wt%, 60wt%, 70wt%, etc., but is not limited thereto.

[0032] In a specific embodiment of the present invention, the tackifying resin includes at least one of hydrogenated C5 tackifying resin, hydrogenated C9 tackifying resin, hydrogenated rosin resin and DCPD hydrogenated resin. Further, the softening point of the tackifying resin may be 90-110°C.

[0033] In a specific embodiment of the present invention, the auxiliary agent includes at least one of an antioxidant and an anti-ultraviolet agent. Further, the auxiliary agent includes 0.1 to 1 part of antioxidant and 0.5 to 1 part of anti-ultraviolet agent by weight.

[0034] In a specific embodiment of the present invention, the antioxidant includes at least one of a hindered phenol antioxidant and a phosphite antioxidant.

[0035] In a specific embodiment of the present invention, the anti-ultraviolet agent includes at least one of a benzotriazole light stabilizer, a triazine light stabilizer and a hindered amine light stabilizer.

[0036] The hot melt adhesive of the present invention has a peel strength of ≥6.8 N / cm with an aramid substrate under standard conditions; after aging in hot air at 80°C for 168 hours, the peel strength with the aramid substrate is ≥5.4 N / cm, and the peel strength retention rate is ≥70%; after immersion in water at 23°C for 168 hours, the peel strength with the aramid substrate is ≥5.5 N / cm, and the peel strength retention rate is ≥64%; after immersion in water at 60 W / m 2 After being treated under ultraviolet conditions for 72 hours, the peel strength with the aramid substrate is ≥5.8N / cm, and the peel strength retention rate is ≥70%. The hot melt adhesive of the present invention has no slippage, no flow, and no dripping at 80°C / 2h.

[0037] In another aspect of the present invention, a method for preparing any one of the above-mentioned hot melt adhesives for irrigation hoses is provided, comprising the following steps: mixing the components in proportion, performing melt extrusion granulation, and obtaining the hot melt adhesive.

[0038] In a specific embodiment of the present invention, during the melt extrusion granulation, the temperature of the extruder is 80-150°C.

[0039] Another aspect of the present invention provides an irrigation hose, comprising any one of the above-mentioned hot melt adhesives for irrigation hoses.

[0040] In a specific embodiment of the present invention, the irrigation hose comprises an aramid layer, a polyethylene layer and a hot melt adhesive for the irrigation hose arranged between the aramid layer and the polyethylene layer.

[0041] Example 1 The present embodiment provides a hot melt adhesive for an irrigation hose, wherein the raw materials include the following components in parts by weight: 30 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 20 parts of styrene block copolymer (SIS1250L), 10 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0042] The preparation method of the hot melt adhesive for irrigation hose of this embodiment comprises the following steps: weighing the above raw materials in proportion, mixing them evenly, and then using a twin-screw extruder to melt-extrude and granulate them to obtain the hot melt adhesive for irrigation hose. The temperature settings of the extruder are 80°C, 120°C, 150°C, 150°C, 150°C, 150°C, 150°C, 150°C, and 150°C, respectively.

[0043] Example 2 This embodiment refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, the only difference being that the amounts of the components in the raw materials are different.

[0044] The hot melt adhesive for the irrigation hose of this embodiment includes the following components in parts by weight: 25 parts of hydrogenated C5 petroleum resin, 35 parts of EVA resin (Formosa Plastics 7350M), 30 parts of styrene block copolymer (SIS1250L), 10 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0045] Example 3 This embodiment refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, the only difference being that the amounts of the components in the raw materials are different.

[0046] The hot melt adhesive for the irrigation hose of this embodiment includes the following components in parts by weight: 30 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 15 parts of styrene block copolymer (SIS1250L), 15 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0047] Example 4 This embodiment refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, the only difference being that the amounts of the components in the raw materials are different.

[0048] The hot melt adhesive for the irrigation hose of this embodiment includes the following components in parts by weight: 30 parts of hydrogenated C5 petroleum resin, 25 parts of EVA resin (Formosa Plastics 7350M), 25 parts of styrene block copolymer (SIS1250L), 20 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0049] Example 5 This embodiment refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, the only difference being that the amounts of the components in the raw materials are different.

[0050] The hot melt adhesive for the irrigation hose of this embodiment includes the following components in parts by weight: 24 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 20 parts of styrene block copolymer (SIS1250L), 16 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0051] Example 6 This embodiment refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, the only difference being that the amounts of the components in the raw materials are different.

[0052] The hot melt adhesive for the irrigation hose of this embodiment includes the following components in parts by weight: 20 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 20 parts of styrene block copolymer (SIS1250L), 20 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0053] Example 7 This embodiment refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, the only difference being that the type of EVA resin in the raw material is different.

[0054] The hot melt adhesive for the irrigation hose of this embodiment uses an EVA resin (EVA28400, LG, Korea) with an equal weight of VA content of 28% to replace the EVA resin (Formosa Plastics 7350M) in Example 1.

[0055] Comparative Example 1 Comparative Example 1 refers to the hot melt adhesive for irrigation water hose and the preparation method thereof of Example 1, except that the amounts of the components in the raw materials are different.

[0056] The hot melt adhesive for irrigation hose of Comparative Example 1 comprises the following components in parts by weight: 40 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 20 parts of styrene block copolymer (SIS1250L), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0057] Comparative Example 2 Comparative Example 2 refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, except that the amounts of the components in the raw materials are different.

[0058] The hot melt adhesive for irrigation hose of Comparative Example 2 comprises the following components in parts by weight: 25 parts of hydrogenated C5 petroleum resin, 45 parts of EVA resin (Formosa Plastics 7350M), 30 parts of styrene block copolymer (SIS1250L), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0059] Comparative Example 3 Comparative Example 3 refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, except that the amounts of the components in the raw materials are different.

[0060] The hot melt adhesive for irrigation hose of Comparative Example 3 comprises the following components in parts by weight: 30 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 30 parts of styrene block copolymer (SIS1250L), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0061] Comparative Example 4 Comparative Example 4 refers to the hot melt adhesive for irrigation hose and the preparation method thereof of Example 1, except that the amounts of the components in the raw materials are different.

[0062] The hot melt adhesive for irrigation hose of Comparative Example 4 comprises the following components in parts by weight: 10 parts of hydrogenated C5 petroleum resin, 40 parts of EVA resin (Formosa Plastics 7350M), 20 parts of styrene block copolymer (SIS1250L), 30 parts of PMV resin (Huihong PMV50H), 0.5 parts of antioxidant B215 and 0.5 parts of light stabilizer 774.

[0063] Comparative Example 5 Comparative Example 5 refers to the hot melt adhesive for irrigation water hose and the preparation method thereof of Example 1, except that an equal weight of SMA (styrene-maleic anhydride copolymer) resin (Huihong SMA-10H) is used to replace the PMV resin in Example 1.

[0064] Experimental example In order to compare and illustrate the performance of the hot melt adhesives of different embodiments and comparative examples, the following tests were conducted, and the test results are shown in Table 1. The test method refers to GB / T 23457-2017.

[0065] Table 1 Performance test results of different hot melt adhesives

[0066] From the above test results, it can be seen that the hot melt adhesive of the present invention not only has excellent initial peel strength for aramid substrates, but also maintains a peel strength of more than 70% of the initial peel strength after being treated under certain heat aging conditions, more than 64% of the initial peel strength after being treated under certain water immersion conditions, and more than 70% of the initial peel strength after being treated under certain ultraviolet conditions. In addition, there is no slippage, no flow, and no dripping under high temperature environments, which shows that the hot melt adhesive of the present invention has excellent weather resistance. In addition, the hot melt adhesive of the present invention has suitable strength and toughness, so that the hot melt adhesive has better environmental adaptability.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Hot melt adhesive for irrigation hose, characterized in that: The invention comprises the following components by weight: 10 to 30 parts of tackifying resin, 25 to 40 parts of EVA resin, 15 to 40 parts of styrene block copolymer, 10 to 20 parts of PMV resin and 0.1 to 2 parts of auxiliary agent; The content of maleic anhydride in the PMV resin is 10% to 50%; the weight average molecular weight of the PMV resin is 100,000 to 300,000.

2. The hot melt adhesive for irrigation hose according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 25-30 parts of tackifying resin, 35-40 parts of EVA resin, 20-30 parts of styrene block copolymer, 10-15 parts of PMV resin and 0.1-2 parts of auxiliary agent.

3. The hot melt adhesive for irrigation hose according to claim 1, characterized in that: The mass ratio of the PMV resin to the tackifying resin is 1:(1.5-3).

4. The hot melt adhesive for irrigation hose according to claim 1, characterized in that: In the EVA resin, the VA content is 12% to 28%; The melt index of the EVA resin under the conditions of 2.16 kg and 10 min is 1 to 7 g / 10 min.

5. The hot melt adhesive for irrigation hose according to claim 1, characterized in that: The styrene block copolymer includes at least one of SIS, SBS, SEBS and SSBR.

6. The hot melt adhesive for irrigation hose according to claim 1, characterized in that: The tackifying resin includes at least one of hydrogenated C5 tackifying resin, hydrogenated C9 tackifying resin, hydrogenated rosin resin and DCPD hydrogenated resin.

7. The hot melt adhesive for irrigation hose according to claim 1, characterized in that: The auxiliary agent includes at least one of an antioxidant and an anti-ultraviolet agent.

8. A method for preparing hot melt adhesive for irrigation hoses, characterized in that: The method comprises the following steps: mixing the components of the hot melt adhesive for irrigation water hose according to any one of claims 1 to 7, and then performing melt extrusion granulation to obtain the hot melt adhesive.

9. An irrigation hose, characterized in that: The invention comprises the hot melt adhesive for irrigation water hose as claimed in any one of claims 1 to 7.

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