Hot-melt adhesive for irrigation water hose, its preparation method and irrigation water hose

Abstract

The present invention relates to the technical field of adhesive materials, and particularly to a hot melt adhesive for irrigation water hoses, its preparation method, and an irrigation water hose. The hot melt adhesive for irrigation water hoses comprises the following components in parts by weight: 10-30 parts of tackifying resin, 25-40 parts of EVA resin, 15-40 parts of styrene block copolymer, 10-20 parts of PMV resin, and 0.1-2 parts of additives; in the PMV resin, the content of maleic anhydride is 10%-50%; the weight average molecular weight of the PMV resin is 100,000-300,000. In the hot melt adhesive of the present invention, the introduction of PMV resin in combination with tackifying resin, EVA resin, and styrene block copolymer not only improves the bonding strength of the hot melt adhesive to aromatic hydrocarbons, but also takes into account the improvement of heat resistance, water resistance, and weather resistance such as resistance to ultraviolet rays, while ensuring the mechanical properties of the hot melt adhesive.

Description

Technical Field

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

[0002] Aramid-based polyethylene-lined water hoses are commonly used irrigation water hoses at present, and the layers are bonded through an adhesive material. At present, there are mainly two types of adhesives used in the field of building waterproofing. One is an asphalt-based self-adhesive made of synthetic rubber such as SBS, tackifiers, and petroleum asphalt, etc. The other is a non-asphalt-based self-adhesive made of synthetic rubber such as SIS, tackifiers, and additives, etc. The asphalt-based self-adhesive has self-healing properties and good bonding performance, but its aging resistance is poor. The non-asphalt-based self-adhesive is a new type of environmentally friendly polymer waterproof material with good mechanical properties and convenient construction. However, due to the lack of polar groups in styrene block copolymers such as SIS and poor water resistance, its bonding performance is insufficient, affecting the service life of buildings.

[0003] Chinese Patent Application with Publication No. CN107189732A discloses a hot melt pressure-sensitive adhesive for highly weather-resistant thermoplastic polyolefin waterproof coiled materials, which grafts SIS elastomer and polyisoprene rubber with an acrylate cross-linking agent to reduce the number of double bonds in the elastomer material and improve the bonding property and weather resistance. It is combined with amorphous olefin copolymer APAO and polyisoprene rubber to improve the bonding performance. Chinese Patent Application with Publication No. CN114262586A discloses an antibacterial EVA edge-sealing hot melt adhesive material, which is compounded with components such as EVA, SIS, and tackifying resin to improve the bonding performance. Although these hot melt adhesives improve the weather resistance to a certain extent, their bonding property to aramid materials is still poor, severely limiting the performance of aramid-based polyethylene-lined water hoses.

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

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

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

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

[0008] In order to achieve the above objects of the present invention, on the one hand, the present invention provides a hot melt adhesive for irrigation water hoses, which comprises the following components in parts by weight: 10-30 parts of tackifying resin, 25-40 parts of EVA resin, 15-40 parts of styrene block copolymer, 10-20 parts of PMV resin, and 0.1-2 parts of additives;

[0009] In the PMV resin, the content of maleic anhydride is 10% - 50%; the weight-average molecular weight of the PMV resin is 100,000 - 300,000.

[0010] In a specific embodiment of the present invention, the hot melt adhesive for irrigation water belts 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 additives.

[0011] 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).

[0012] In a specific embodiment of the present invention, in the EVA resin, the VA content is 12% - 28%. Further, the melt index of the EVA resin under the conditions of 2.16 kg and 10 min is 1 - 7 g / 10 min.

[0013] In a specific embodiment of the present invention, the styrene block copolymer comprises at least one of SIS, SBS, SEBS, and SSBR.

[0014] In a specific embodiment of the present invention, the tackifying resin comprises at least one of hydrogenated C5 tackifying resin, hydrogenated C9 tackifying resin, hydrogenated rosin resin, and DCPD hydrogenated resin.

[0015] In a specific embodiment of the present invention, the additives comprise at least one of antioxidant and ultraviolet absorber. Further, the additives comprise 0.1 - 1 part of antioxidant and 0.5 - 1 part of ultraviolet absorber by weight.

[0016] On the other hand, the present invention provides a preparation method of the above-mentioned hot melt adhesive for irrigation water belts, comprising the following steps: mixing each component in proportion, and performing melt extrusion granulation to obtain the hot melt adhesive.

[0017] In a specific embodiment of the present invention, in the melt extrusion granulation, the temperature of the extruder is 80 - 150 °C.

[0018] On another aspect, the present invention provides an irrigation water belt comprising the above-mentioned hot melt adhesive for irrigation water belts.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (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, while improving the bonding strength of the hot melt adhesive to aromatic hydrocarbons, taking into account the improvement of heat resistance, water resistance, ultraviolet resistance and other weather resistance, and at the same time ensuring the mechanical properties of the hot melt adhesive;

[0021] (2) The irrigation water belt prepared with the hot melt adhesive of the present invention has excellent bonding performance to the aramid-based polyethylene inner liner, and extends the service life of the aramid-based polyethylene inner liner water belt. Detailed implementation manners

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with the detailed implementation manners. However, those skilled in the art will understand that the following described embodiments are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention. Those not specified in the embodiments are carried out under conventional conditions or conditions recommended by the manufacturer. Those reagents or instruments not specified by the manufacturer can be obtained as conventional products through commercial purchase.

[0023] The present invention provides a hot melt adhesive for irrigation water belts, which includes the following components in parts by weight: 10-30 parts of tackifying resin, 25-40 parts of EVA resin, 15-40 parts of styrene block copolymer, 10-20 parts of PMV resin and 0.1-2 parts of additives;

[0024] In the PMV resin, the content of maleic anhydride is 10%-50%; the weight average molecular weight of the PMV resin is 100,000-300,000.

[0025] A certain amount of vinyl acetate-maleic anhydride copolymer (PMV) resin is added to the hot melt adhesive of the present invention, introducing appropriate polar groups into the hot melt adhesive system, improving the wettability of the hot melt adhesive to aramid and being able to form a certain chemical bond with 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 appropriate strength and toughness, so that the hot melt adhesive has better environmental adaptability.

[0026] 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 introduced polar groups is insufficient, and the improvement of wettability and bonding properties is not obvious; when the amount of PMV resin is too high, the intermolecular force between the molecular chains of the hot melt adhesive increases and the crosslinking degree of the system is too high, reducing the flexibility of the molecular chains of the hot melt adhesive system and affecting its bonding properties, toughness and processing properties. In the present invention, adjusting the amount of PMV resin within the above range and cooperating with the other components is more conducive to taking into account and ensuring the bonding properties, mechanical properties and weather resistance of the hot melt adhesive, etc.

[0027] In different embodiments, by weight, the amounts of the components in the hot melt adhesive for irrigation water hoses can be as follows:

[0028] The amount of tackifying resin can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts or the range composed of any two of them;

[0029] The amount of EVA resin can be 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts or the range composed of any two of them;

[0030] The amount of styrene block copolymer can be 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or the range composed of any two of them;

[0031] The amount of PMV resin can be 10 parts, 12 parts, 15 parts, 18 parts, 20 parts or the range composed of any two of them;

[0032] The amount of the additive can be 0.1 part, 0.5 part, 1 part, 1.5 parts, 2 parts or the range composed of any two of them.

[0033] Using PMV resin with a certain content of maleic anhydride helps to cooperate with the other components. Under the condition of an appropriate addition amount of PMV resin, 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 property 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, it will affect the processing property of the hot melt adhesive. In different embodiments, in the PMV resin, the content of maleic anhydride can be 10%, 15%, 20%, 30%, 40%, 50% or the range composed of any two of them; the weight average molecular weight of the PMV resin can be 100,000, 120,000, 150,000, 180,000, 200,000, 220,000, 250,000, 280,000, 300,000 or the range composed of any two of them.

[0034] In a specific embodiment of the present invention, the hot melt adhesive for irrigation water belts 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 additives.

[0035] In a specific embodiment of the present invention, the mass ratio of PMV resin to tackifying resin is 1:(1.5-3), further 1:(2.5-3).

[0036] The present invention regulates the amounts of PMV resin and tackifying resin within the above ranges to further improve the bonding performance of the hot melt adhesive to aramid, weather resistance, as well as the 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 the range composed of any two of them.

[0037] In a specific embodiment of the present invention, in the EVA resin, the VA content is 12%-28%. Further, the melt index of the EVA resin under the conditions of 2.16 kg and 10 min is 1-7 g / 10 min.

[0038] Using the EVA resin that meets the above conditions can cooperate with the other components to improve the bonding performance of the hot melt adhesive and take into account ensuring heat resistance and avoiding slippage at 80°C. For example, in different embodiments, in the EVA resin, the VA content can be 12%, 16%, 18%, 20%, 24%, 28%, or the range composed of any two of them; the melt index of the EVA resin at 2.16 kg / 10 min can be 1 g / 10 min, 3 g / 10 min, 5 g / 10 min, 7 g / 10 min, or the range composed of any two of them.

[0039] In a specific embodiment of the present invention, the styrene block copolymer includes at least one of SIS, SBS, SEBS, and SSBR.

[0040] In a specific embodiment of the present invention, in the styrene block copolymer, the content of diblock ≥ 25 wt%, such as it can be 25 wt%, 30 wt%, 40 wt%, 50 wt%, 60 wt%, 70 wt%, etc., but not limited thereto.

[0041] 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 can be 90-110°C.

[0042] In a specific embodiment of the present invention, the auxiliary agent includes at least one of an antioxidant and an ultraviolet absorber. Further, the auxiliary agent includes 0.1 to 1 part by weight of an antioxidant and 0.5 to 1 part by weight of an ultraviolet absorber.

[0043] In a specific embodiment of the present invention, the antioxidant includes at least one of a hindered phenol antioxidant and a phosphite antioxidant.

[0044] In a specific embodiment of the present invention, the ultraviolet absorber includes at least one of a benzotriazole light stabilizer, a triazine light stabilizer, and a hindered amine light stabilizer.

[0045] 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 h, 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 h, the peel strength with the aramid substrate is ≥5.5 N / cm, and the peel strength retention rate is ≥64%; after treatment under ultraviolet conditions of 60 W / m 2 for 72 h, the peel strength with the aramid substrate is ≥5.8 N / 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 / 2 h.

[0046] On the other hand, the present invention provides a method for preparing any one of the above-mentioned hot melt adhesives for irrigation water hoses, comprising the following steps: mixing each component in proportion, and performing melt extrusion granulation to obtain the hot melt adhesive.

[0047] In a specific embodiment of the present invention, in the melt extrusion granulation, the temperature of the extruder is 80 to 150 °C.

[0048] On another aspect, the present invention provides an irrigation water hose comprising any one of the above-mentioned hot melt adhesives for irrigation water hoses.

[0049] In a specific embodiment of the present invention, the irrigation water hose includes an aramid layer, a polyethylene layer, and a hot melt adhesive for irrigation water hoses disposed between the aramid layer and the polyethylene layer.

[0050] Example 1

[0051] This example provides a hot melt adhesive for irrigation water hoses, and 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0052] The preparation method of the hot melt adhesive for irrigation water belts in this embodiment includes the following steps: Weigh the above raw materials in proportion, mix them evenly, and then use a twin-screw extruder for melt extrusion granulation to obtain the hot melt adhesive for irrigation water belts. Among them, the temperature settings of each temperature of the extruder are 80°C, 120°C, 150°C, 150°C, 150°C, 150°C, 150°C, 150°C in sequence.

[0053] Example 2

[0054] This embodiment refers to the hot melt adhesive for irrigation water belts and its preparation method in Example 1, and the only difference is that the dosages of each component in the raw materials are different.

[0055] The hot melt adhesive for irrigation water belts in this embodiment, the raw materials include the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0056] Example 3

[0057] This embodiment refers to the hot melt adhesive for irrigation water belts and its preparation method in Example 1, and the only difference is that the dosages of each component in the raw materials are different.

[0058] The hot melt adhesive for irrigation water belts in this embodiment, the raw materials include the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0059] Example 4

[0060] This embodiment refers to the hot melt adhesive for irrigation water belts and its preparation method in Example 1, and the only difference is that the dosages of each component in the raw materials are different.

[0061] The hot melt adhesive for irrigation water belts in this embodiment, the raw materials include the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0062] Example 5

[0063] This embodiment refers to the hot melt adhesive for irrigation water belts and its preparation method in Example 1, and the only difference is that the dosages of each component in the raw materials are different.

[0064] The hot melt adhesive for irrigation water hoses in this embodiment comprises the following components 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 (Huohong PMV50H), 0.5 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0065] Example 6

[0066] The hot melt adhesive for irrigation water hoses in this embodiment refers to that in Example 1 and its preparation method, with the difference only being: the dosages of each component in the raw materials are different.

[0067] The hot melt adhesive for irrigation water hoses in this embodiment comprises the following components 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 (Huohong PMV50H), 0.5 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0068] Example 7

[0069] The hot melt adhesive for irrigation water hoses in this embodiment refers to that in Example 1 and its preparation method, with the difference only being: the type of EVA resin in the raw materials is different.

[0070] In the hot melt adhesive for irrigation water hoses in this embodiment, the EVA resin (South Korea LG, EVA28400) with a VA content of 28% and equal weight is used to replace the EVA resin (Formosa Plastics 7350M) in Example 1.

[0071] Comparative Example 1

[0072] Comparative Example 1 refers to the hot melt adhesive for irrigation water hoses in Example 1 and its preparation method, with the difference being: the dosages of each component in the raw materials are different.

[0073] The hot melt adhesive for irrigation water hoses in Comparative Example 1 comprises the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0074] Comparative Example 2

[0075] Comparative Example 2 refers to the hot melt adhesive for irrigation water hoses in Example 1 and its preparation method, with the difference being: the dosages of each component in the raw materials are different.

[0076] The hot melt adhesive for irrigation water belts in Comparative Example 2 comprises the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0077] Comparative Example 3

[0078] The hot melt adhesive for irrigation water belts in Comparative Example 3 refers to that in Example 1 and its preparation method, with the difference being that the dosages of the components in the raw materials are different.

[0079] The hot melt adhesive for irrigation water belts in Comparative Example 3 comprises the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0080] Comparative Example 4

[0081] The hot melt adhesive for irrigation water belts in Comparative Example 4 refers to that in Example 1 and its preparation method, with the difference being that the dosages of the components in the raw materials are different.

[0082] The hot melt adhesive for irrigation water belts in Comparative Example 4 comprises the following components 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 part of antioxidant B215, and 0.5 part of light stabilizer 774.

[0083] Comparative Example 5

[0084] The hot melt adhesive for irrigation water belts in Comparative Example 5 refers to that in Example 1 and its preparation method, with the difference being that an equal weight of SMA (styrene-maleic anhydride copolymer) resin (Huihong SMA-10H) is used to replace the PMV resin in Example 1.

[0085] Experimental Example

[0086] In order to compare and illustrate the performance of the hot melt adhesives in different examples and comparative examples, the following tests were carried out, and the test results are shown in Table 1. The test method refers to GB / T 23457-2017.

[0087] Table 1 Performance test results of different hot melt adhesives

[0088]

[0089] 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 after being treated under certain heat aging conditions, the peel strength remains above 70% of the initial peel strength. After being treated under certain immersion conditions, the peel strength remains above 64% of the initial peel strength. After being treated under certain ultraviolet conditions, the peel strength remains above 70% of the initial peel strength. And in a high-temperature environment, there is no slippage, no flow, and no dripping, indicating that the hot melt adhesive of the present invention has excellent weather resistance. In addition, the hot melt adhesive of the present invention has appropriate strength and toughness, making the hot melt adhesive have better environmental adaptability.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The hot melt adhesive for irrigation water hose is characterized in that, It comprises the following components by weight parts: 10 - 30 parts of tackifying resin, 30 - 40 parts of EVA resin, 20 - 40 parts of styrene block copolymer, 10 - 20 parts of PMV resin, and 0.1 - 2 parts of additives. In the PMV resin, the content of maleic anhydride is 10% - 50%; the weight-average molecular weight of the PMV resin is 100,000 - 300,000.

2. The hot melt adhesive for irrigation water hoses according to claim 1, wherein It comprises the following components by weight parts: 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 additives.

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

5. The hot melt adhesive for irrigation water hoses 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 water hoses according to claim 1, wherein, 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 water hoses according to claim 1, characterized in that, The additives include at least one of antioxidant and ultraviolet absorber.

8. Preparation method of hot melt adhesive for irrigation water belt, characterized in that, It includes the following steps: mixing according to the components of the hot melt adhesive for irrigation water belt described in any one of claims 1 - 7, and then performing melt extrusion granulation to obtain the hot melt adhesive.

9. An irrigation water hose, characterized in that, It includes the hot melt adhesive for irrigation water belt described in any one of claims 1 - 7.

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