Agricultural irrigation hose and method of making same

Abstract

The application discloses an agricultural irrigation water hose and a preparation method thereof. The agricultural irrigation water hose comprises, from top to bottom, a braided layer, a hot melt adhesive layer and an inner film layer, wherein the braided layer is made of polypropylene yarn. The irrigation water hose has the following advantages: 1) the adhesion strength between the inner film and the outer polypropylene yarn braided layer is greater than or equal to 15 n at a width of 50 mm after the irrigation water hose is normally rolled and placed for 24 hours; and 2) after being placed in an outdoor high-temperature environment of 75 DEG C for 30 days, the inner film and the outer polypropylene yarn braided layer of the water hose do not produce delamination, and the inner film does not become hard at a low temperature of -25 DEG C.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot melt adhesive, in particular to an agricultural irrigation water hose and a preparation method thereof. BACKGROUND

[0002] The agricultural irrigation water hose is made of high-strength polyester and high-quality PVC synthetic material, is light in weight, good in flexibility, bright in color, smooth in coating, easy to roll and store, convenient to move, unlimited in length, soft and elastic in low-temperature water, resistant to high pressure, corrosion, ultraviolet rays, wear and aging, and is the most ideal water-saving irrigation tool in China, which has the characteristics of water saving, energy saving, yield increase, cost saving, easy use, prevention of water and soil loss and soil alkalization.

[0003] In the prior art, CN 113956825 A discloses a hot melt adhesive and a waterproof lap joint adhesive tape, which comprises the following components in percentage: SIS elastomer 20-40%, SBS 2-10%, hydrogenated C5 resin 10-30%, hydrogenated C9 resin 10-30%, rosin resin 5-10%, naphthenic oil 10-20%, and antioxidant 0.5-1%; the hydrogenated C5 resin is compatible with the rubber segment I / B segment in the SIS / SBS elastomer, and the hydrogenated C9 resin is compatible with the rubber segment S segment in the SIS / SBS elastomer; the preparation method comprises the following steps: step S1, stirring each component in a stirring kettle; step S2, waiting until transparent and no particles after stirring in step S1; the stirring time is 1-5 hours, and the temperature of the stirring kettle is 150-180 DEG C; a waterproof lap joint adhesive tape has the hot melt adhesive, and the hot melt adhesive is coated on the HDPE coiled material layer as a hot melt adhesive layer by a high-temperature glue coating device. The present application has good peeling, holding and shear heat stability, long open time, good storage stability, and can realize higher bonding strength when applied to the construction node treatment of high molecular pre-paved reverse sticking coiled material.

[0004] To sum up, the technical problem to be solved by the present application is:

[0005] The present application provides an agricultural irrigation water hose, which has a hot melt adhesive as a bonding layer, and a braided layer 11 and an inner film layer 13 arranged on both sides of the bonding layer, so that the agricultural irrigation water hose can meet the requirements of the use environment, large temperature difference in local areas, low temperature resistance and high temperature resistance, adhesion to the base material, and dry surface after coating the glue on the base material without rolling and re-sticking. SUMMARY

[0006] The present application aims to provide an agricultural irrigation water hose and a preparation method thereof, which has good performance, specifically:

[0007] The hot melt adhesive of the irrigation water hose of the application is used for bonding between polyester and PVC materials, and the technical difficulties are: 1. The material covering temperature is low, about 80-90℃, and the material requires high heat sensitivity and good adhesion to the substrate; 2. The PVC material requires a dry surface after covering the glue, and the winding does not stick again; 3. Environmental adaptability requirements, irrigation water hose is widely used in various regions, and has low temperature and high temperature resistance requirements in some regions with large temperature difference.

[0008] To achieve the above object, the application is realized by the following technical scheme:

[0009] An agricultural irrigation water hose comprises, from top to bottom, sequentially arranged:

[0010] A woven layer;

[0011] A hot melt adhesive layer;

[0012] An inner film layer;

[0013] The woven layer is woven from polypropylene filaments.

[0014] As a further improvement, the hot melt adhesive layer is composed of the following components by mass:

[0015]

[0016]

[0017] As a further improvement, the Fischer-Tropsch wax is refined Fischer-Tropsch wax FR80A.

[0018] As a further improvement, the low-density oxidized polyethylene wax is low-density oxidized polyethylene wax A-C629A.

[0019] As a further improvement, the antioxidant is antioxidant 1010.

[0020] As a further improvement, the inner film layer 13 is PE, and the thickness of the inner film layer 13 is 0.12-0.15mm.

[0021] As a further improvement, the thickness of the woven layer is 0.4-0.5mm.

[0022] As a further improvement, the thickness of the hot melt adhesive layer 12 is 0.08-0.1mm.

[0023] A method for an agricultural irrigation water hose comprises the following preparation steps:

[0024] S1. The inner film layer 13 is unwound through a guide roller;

[0025] S2 The braided layer 11 coated with the hot melt adhesive layer 12 is heated, the hot melt adhesive layer 12 is melted, and the inner membrane layer 13 is bonded with the braided layer 11 under the pressure generated by the expansion of the heating pipe and the water hose;

[0026] S3 The water hose is cooled by air cooling through the cooling box, and the cooled agricultural irrigation water hose is prepared.

[0027] A preparation method of the hot melt adhesive for covering the agricultural irrigation water hose, comprising the following preparation steps:

[0028] S1, melting wax;

[0029] S2, feeding resin;

[0030] S3, feeding polyethylene wax;

[0031] S4, after the finished product is detected to be qualified, discharging according to the packaging requirements.

[0032] As a further improvement of the present scheme,

[0033] S1, the specific operation steps of melting wax are:

[0034] 1) Turn on the stirring kettle heating system, and control the heating temperature at 80-130℃;

[0035] 2) When the stirring state is confirmed to be in a stagnant state, open the manhole, and when the temperature is at 50-80℃, feed the raw material wax into the stirring kettle, and require to be fed within 10 minutes;

[0036] 3) After feeding is completed, start stirring, the initial speed is 5-10, and after the material is dissolved by about 50%, slowly increase the speed to the specified speed of 20-30;

[0037] 4) Heat and stir for 20 minutes, control the temperature at 140-160℃, and control the speed at 20-30, and observe the stirring motor and the melting of the material in the tank during the melting process; require to be completely dissolved into liquid.

[0038] 5) Feed EVA, control the temperature at 140-160℃, and control the speed at 30-40rpm, observe the melting state at any time during the EVA melting process, and after the EVA is fully dissolved (generally in 45-60 minutes), generally control the time and the blending temperature (the stirring process is all kept vacuumizing, which can effectively reduce VOC emission);

[0039] As a further improvement of the present scheme,

[0040] S2, the specific operation steps of feeding resin are:

[0041] 1) EVA melting is completed, start to put petroleum resin, batch feeding, control stirring speed 40-50 rpm, temperature control at 140-150 DEG C;

[0042] After petroleum resin is finished, continue to vacuum, and wait for resin melting to be completed;

[0043] 2) after petroleum resin melting is completed, start to put rosin resin, batch feeding, control stirring speed 40-50 rpm, temperature is 140-150 DEG C;

[0044] Rosin resin is finished, continue to vacuum, and wait for resin melting to be completed.

[0045] As a further improvement of the present scheme,

[0046] S3, the specific operation steps of polyethylene wax are as follows:

[0047] 1) close the stirring kettle vacuum, open the stirring kettle feeding port, slowly put high polarity polyethylene wax into the stirring kettle;

[0048] 2) stirring kettle speed 20-30 rpm, temperature control at 150-160 DEG C, wait for the wax to completely melt, keep vacuum, increase the speed to 50-60 rpm, and fully melt the material. After observing complete melting, take sample for inspection;

[0049] After vacuum is finished, break vacuum to 0 with nitrogen, and visually observe the dissolution, if not melted well, continue to stir for 20 minutes, and confirm until completely melted.

[0050] As a further improvement of the present scheme,

[0051] S1, in 5) of the wax melting, the melting time of EVA is 45-60 min.

[0052] As a further improvement of the present scheme,

[0053] S1, in 5) of the wax melting, the stirring process is kept in vacuum state.

[0054] The agricultural irrigation water hose covering hot melt adhesive of the present application has the following beneficial effects compared with the hot melt adhesive of the prior art:

[0055] 1) T-704AL, by adopting high EVA main part, by adjusting the VA content, the adhesive force and flexibility of the glue to the base material are adjusted. Different melting points of EVA are matched to adjust the wettability and activation temperature of the hot melt adhesive;

[0056] 2) Hot melt adhesive formula uses hydrogenated rosin resin M2100 to improve the adhesion of the glue between polyester and PVC. Cooperate with hydrogenated petroleum resin 5600 to improve the fast adhesion and holding adhesion of the glue. The use of two kinds of resins can ensure that the glue has high initial strength and holding adhesion, and has good adhesion to the substrate. At the same time, the glue also has strong aging resistance.

[0057] 3) In order to prevent the glue from producing re-adhesion phenomenon during the use of customers and causing product damage. F-T wax with low softening point and high polarity oxidized polyethylene wax are used in combination. Adjust the open time to ensure the initial strength while avoiding the phenomenon of glue re-adhesion.

[0058] 4) High polarity oxidized polyethylene wax: good thermal stability, strong dispersing ability, transparent after melting, good compatibility with glue. It has polarity and high crystallinity, and finally has high strength. After production, it will migrate to the surface of the object, thereby achieving the effect of external lubrication, solving the problem of re-adhesion during customer production.

[0059] More specifically: the agricultural irrigation water belt covering hot melt adhesive in the application

[0060] P28400: adjust the viscosity of the glue, increase the flowability and wettability of the glue.

[0061] P20020: adjust the final strength of the glue, low VA content can reduce the generation of glue re-adhesion, and help the strength of the glue at high temperature.

[0062] LG33045: can increase the flexibility and initial adhesion of the glue, while ensuring the strength at low temperature.

[0063] 5600: hydrogenated petroleum resin, increases the initial adhesion and final strength, has good heat resistance, and excellent aging resistance.

[0064] KS2100W: hydrogenated rosin resin with very light color, has good initial strength and final strength, and can greatly improve the adhesion to the substrate.

[0065] Fischer-Tropsch wax FR80A: 1. Melt viscosity adjustment and EVA resin have good compatibility, the melt viscosity of hot melt adhesive can be adjusted by changing the amount of Fischer-Tropsch wax. 2. Adjust the working time and curing time. According to the carbon distribution width and usage of Fischer-Tropsch wax, the open condensation temperature of EVA type hot melt adhesive can be controlled. 3. Improve weather resistance, good whiteness, transparency, gloss, thermal stability, heat resistance, no yellowing, and no influence on resin color. 4. Adjust the adaptability, adjust the drawing phenomenon, flowability, wettability requirements, prevent hot melt adhesive from caking, surface sticking and other problems during storage and transportation. Adjust the open time.

[0066] OP-629A: good thermal stability, strong dispersing ability, transparent after melting, good compatibility with glue, with polarity, high crystallinity, high final strength, migration to the surface of the object after production to achieve the effect of external lubrication, solve the problem of re-sticking in the customer production process.

[0067] The components of the present application and the parameters in the preparation process of the present application interact and cooperate with each other, and the prepared agricultural irrigation water hose covering hot melt adhesive can be used for bonding between polyester and PVC materials, and the technical difficulties in the prior art are overcome: 1. The material covering temperature is low, about 80-90℃, which requires high thermal sensitivity of the material and good adhesion to the substrate; 2. The PVC material requires a dry surface after covering the glue, and the roll-up does not re-stick; 3. Environmental adaptability requirement, irrigation hose is widely used in various regions, and the temperature difference in local areas is large, which meets the requirements of low temperature resistance and high temperature resistance.

[0068] The agricultural irrigation water hose of the present application has the following beneficial effects:

[0069] 1) After cooling water is not higher than 12℃, the film surface does not stick after cooling and blowing film forming and rolling in the 50℃ oven, and the roll cannot be opened;

[0070] 2) The hot melt adhesive is heated to the normal use temperature of 165℃, and the film surface does not appear obvious crystal point.

[0071] 3) The adhesion strength of the inner film and the outer polypropylene wire braid layer of the irrigation hose is ≥15n after normal rolling and placing for 24 hours, with a width of 50mm;

[0072] 4) The inner film and the outer polypropylene wire braid layer of the irrigation hose do not produce delamination under the condition of high temperature 75℃ and static state, and the inner film does not become hard at low temperature-25℃. BRIEF DESCRIPTION OF DRAWINGS

[0073] Figure 1 The figure is a schematic diagram of the structure of the agricultural irrigation water hose of the present application;

[0074] Figure 2 The figure is a viscosity-temperature curve of the hot melt adhesive in examples 1-5;

[0075] Figure 3 The figure is a schematic diagram of a dumbbell-shaped sample made of glue;

[0076] Figure 4 The figure is the structure of the sample strip made in examples 1-5. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described below in combination with the drawings and the best embodiments:

[0078] The specific operation steps of the present application are as follows:

[0079] S1, wax melting process

[0080] 1) Turn on the stirring kettle heating system, and control the temperature at 80-130°C;

[0081] 2) After confirming that the stirring state is in a stagnant state, open the manhole, and when the temperature is at 50-80°C, pour the raw wax into the stirring kettle, and require to pour it within 10 minutes;

[0082] 3) After pouring the material, start stirring, the initial speed is 5-10, and after the material is dissolved by about 50%, slowly increase the speed to the specified speed of 20-30;

[0083] 4) Heat and stir for 20 minutes, control the temperature at 140-160°C, and control the speed at 20-30 rpm. Observe the stirring motor and the melting of the material in the kettle during the wax melting process; require to be completely dissolved into liquid;

[0084] 5) Pour in EVA, control the temperature at 140-160°C, and control the speed at 30-40 rpm. Observe the melting state at any time during the EVA melting process, pour in EVA in batches, and after EVA is fully dissolved (usually in 45-60 minutes), generally control the time and blending temperature (keep vacuum during the stirring process, which can effectively reduce VOC emission).

[0085] S2, resin pouring stage

[0086] 1) After the EVA melting is completed, start pouring petroleum resin, pour in batches, control the stirring speed (40-50 rpm), and control the temperature at 140-150°C; continue to vacuum after the petroleum resin is poured, and wait for the resin to melt completely.

[0087] 2) After the petroleum resin melting is completed, start pouring rosin resin, pour in batches, control the stirring speed (40-50 rpm), and control the temperature at 140-150°C; continue to vacuum after the rosin resin is poured, and wait for the resin to melt completely.

[0088] S3, polyethylene wax pouring

[0089] 1) Close the stirring kettle vacuum, open the stirring kettle pouring port, and slowly pour high-polarity polyethylene wax into the stirring kettle.

[0090] 2) The stirring kettle speed is 20-30 rpm, the temperature is controlled at 150-160°C, and the wax is completely melted. Increase the speed to 50-60 rpm to fully melt the material. After observing complete melting, take a sample for inspection;

[0091] After the vacuum is broken, use nitrogen to break the vacuum to 0, and visually observe the dissolution. If it is not melted well, continue to stir for 20 minutes and confirm, until it is completely melted.

[0092] S4, discharging

[0093] After the finished product is qualified, it is discharged according to the packaging requirements.

[0094] Example 1

[0095] The formula of Example 1 is shown in Table 1, and the specific operation steps are prepared according to the above preparation process

[0096] Table 1 Component and content table of Example 1

[0097] Comparative Example 2

[0098] The formula of Comparative Example 2 is shown in Table 2, and the specific operation steps are prepared according to the above preparation process Table 2 Component and content table of Comparative Example 2

[0099] Table 2 Component and content table of Comparative Example 2

[0100]

[0101]

[0102] Formula 2 does not add M2100, and compares with Formula 1 to explore the influence of the addition of M2100 on the performance of the glue sample.

[0103] Comparative Example 3

[0104] The formula of Comparative Example 3 is shown in Table 3, and the specific operation steps are prepared according to the above preparation process

[0105] Table 3 Component and content table of Example 3

[0106]

[0107] Comparative Example 4

[0108] The formula of Comparative Example 4 is shown in Table 4, and the specific operation steps are prepared according to the above preparation process

[0109] Table 4 Component and content table of Comparative Example 4

[0110]

[0111]

[0112] Formulas 3 and 4 respectively replace the aliphatic modified DCPD tackifying resin 5600 with C9 tackifying resin resin HM-1000 and DCPD tackifying resin ER400, and compare with Formula 1 to explore the influence of the addition of 5600 on the performance of the glue sample.

[0113] Comparative Example 5

[0114] The formulation of Comparative Example 5 is shown in Table 5, and the specific operation steps are prepared according to the preparation process described above

[0115] Table 5: Component and content table of Example 5

[0116]

[0117] Formulation 5 does not add OP-629A, and control formulation 1, to explore the influence of the addition of OP-629A on the performance of the glue sample.

[0118] The hot melt adhesive product prepared by the present application is tested according to the following test items and test methods

[0119] 1. Test items: softening point, viscosity, brittle fracture temperature, elongation at break, tensile strength, peel strength test, 24h heat aging, 50℃ re-adhesion experiment.

[0120] 2. Test methods:

[0121] Softening point test: GB / T 15332-1994 Hot melt adhesive softening point determination ring ball method

[0122] Viscosity test: HGT3660-1999 Hot melt adhesive melt viscosity determination

[0123] Brittle fracture temperature: low temperature brittle fracture test method (internal standard)

[0124] Elongation at break / elongation at break test:

[0125] GB / T528-2009 Determination of tensile stress-strain properties of vulcanized or thermoplastic rubber

[0126] Peel strength test: water hose glue peel strength test method (internal standard)

[0127] 24h heat aging: GB / T16998-1997 Hot melt adhesive heat stability test

[0128] 50℃ re-adhesion experiment: EVA re-adhesion test (internal standard)

[0129] 3. Test results:

[0130] 3.1 Softening point

[0131] Table 6: Softening point of formulations 1-5

[0132] Formulation Softening point (°C) Formulation 1 (new product formulation) 95.2 Formulation 2 97.6 Formulation 3 94.2 Formulation 4 94.7 Formulation 5 93.4

[0133] As shown in Table 6, the softening points of the five formulations basically meet the requirements, all of which are between 90-100℃. Meet the design requirements.

[0134] 3.2 Viscosity (HGT3660-1999 - Determination of melt viscosity of hot melt adhesive)

[0135] The viscosity of Formulation 1-Formulation 5 as a function of temperature is shown in the following graph: Figure 1 Figure 1 It can be seen that the viscosity at 160°C is all between 8000-11000 cps, and several formulations meet the requirements.

[0136] 3.3 Brittle fracture temperature

[0137] Test method: The adhesive sample was made into a dumbbell-shaped sample as shown in the following figure: Figure 2

[0138] The finished sample is shown in the following figure, and ten samples were made for each formulation: Figure 3

[0139] The finished sample was placed in a water bath filled with chilled liquid, and the glass steel was placed in a freezer, set to the corresponding temperature of (10°C, 7°C, 5°C, 4°C, 3°C, 2°C, 1°C, 0°C), and after 4-5h of freezing, a thermometer was placed in the water bath to measure the current temperature, and the sample was bent 180° by hand at that temperature. The current temperature and the corresponding brittle fracture condition were observed and recorded. The brittle fracture condition is shown in Table 6:

[0140] Table 6 Brittle fracture condition of products made from Formulation 1-Formulation 5

[0141]

[0142] The lowest temperature at which no brittle fracture occurred for each formulation was recorded, and this temperature was the lowest tolerance temperature for that formulation.

[0143] Conclusion: From the above graph, the lowest tolerance temperature of each formulation is:

[0144] Formulation 1 is -1°C; Formulation 2 is 1°C; Formulation 3 is 1°C; Formulation 4 is 1°C; and Formulation 5 is 4°C.

[0145] In summary, Formulation 1 has the best low-temperature performance, Formulations 2, 3, and 4 have basically no difference in low-temperature performance, and Formulation 5 has poor low-temperature performance. OP-629A has more excellent low-temperature performance than FR80A.

[0146] 3.4 Tensile strength: (GB / T528-2009 - Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber)

[0147] Rubber tensile properties (dumbbell-shaped sample) test report

[0148]

[0149] ​​​

[0150] Table 7 Performance test results of products prepared by Formulas 1-5

[0151]

[0152] From Table 7, the performance test results of products prepared by Formulas 1-5 are as follows: the tensile strength and elongation at break of several groups of samples:

[0153]

[0154] Conclusion: From the above data, it can be seen that the tensile strength and elongation at break of Formulas 1, 2, 3, and 4 are basically the same. The tensile strength and elongation at break of Formula 5 are significantly smaller. OP-629A can significantly improve the tensile strength and elongation at break of the formula.

[0155] 3.5 Peeling force test (internal standard)

[0156] Take 1 m of each of the five formulae adhesive water hose finished products. Cut them into narrow strips with a length of 200 mm and a width of 25 mm along the radial direction, five for each formula. Make a 40 mm gap between the inner membrane and the woven cloth along one end of the narrow strip. Clamp the peeled inner membrane and woven cloth to the upper and lower clamps of the universal tensile testing machine respectively, turn on the tensile testing machine, and adjust the test mode to GB / T2791-1995. Adjust the distance between the upper and lower clamps to make the sample tight. Click the zero button and wait for the zero setting to complete, then select the start button to start the test. Record the test results as follows:

[0157]

[0158] Table 8 Performance test results of peeling force and peeling strength of products prepared by Formulas 1-5

[0159]

[0160]

[0161] From the test results of Formulas 1-5 in Table 8, the following conclusions are obtained: comparing Formula 1 with Formulas 2, 3, and 4, it can be seen that:

[0162] Resin viscosity: M2100 > 5600 > ER400 > HM1000

[0163] Comparing Formula 1 with Formula 5

[0164] Wax: OP-629A > FR80A

[0165] 3.6 Thermal stability of colloid for 24 hours

[0166] The results of the heating experiments were recorded as follows

[0167]

[0168] The results of the 24h heating experiments are summarized in Table 9:

[0169] Table 9: Effect of heating time on viscosity for Formulations 1-5

[0170]

[0171]

[0172] From the above data, it can be seen that the viscosity changes of the first four formulations are basically the same. The viscosity of Formulation 5 is slightly higher, and FR80A has slightly poorer aging resistance than OP-629A.

[0173] The results of the 24h heating experiments are summarized in Table 10:

[0174] Table 10: Effect of heating time on softening point for Formulations 1-5

[0175]

[0176] From the above table, it can be seen that before and after heating for 24h, the heat resistance of Formulation 1 is slightly lower than that of pure petroleum resin due to the addition of rosin resin. The softening point difference of Formulations 2, 3, and 4 before and after heating is not more than 3°C. Since the error of the softening point tester is ≥3°C, it can be approximately considered that the softening point of the glue sample is basically unchanged before and after heating. The softening point of Formulation 5 is significantly decreased, and FR80A has poor heat resistance.

[0177] Table 11: Effect of heating time on physical properties for Formulations 1-5

[0178]

[0179]

[0180]

[0181] Discussion of Table 11:

[0182] Based on the above experimental results, the following experimental conclusions can be drawn:

[0183] Yellowing resistance: From Experiments 1 and 2, 3, and 4, it can be seen that M2100 has slightly poorer yellowing resistance than general hydrogenated petroleum resin. From Experiment 1 and Experiment 5, it can be seen that F80A has poorer yellowing resistance than OP-629A.

[0184] 3.7 50°C re-adhesion experiment

[0185] The five prepared glue samples were heated and melted, and then were made into 1 mm thick glue films with a size of 20 cm x 5 cm by using a film press. After the glue films were completely cooled, the films were folded in half, two smooth and flat iron plates were used to clamp the films, and then the iron plates were placed in an oven at 50°C, and a 1 Kg weight was placed on the iron plate. After the oven was closed and heated for a certain period of time, the glue films were taken out, and after the films were completely cooled, the folded surfaces were torn open, and the damage degree of the films was observed. The experimental results are recorded as follows:

[0186] Table 12 Influence of heating time on the damage degree of glue films of Formulations 1-5

[0187]

[0188] From Table 12 above, it can be seen that the OP-629A wax has a significant improvement in the performance of controlling the re-adhesion of the surface of the glue compared to the traditional Fischer-Tropsch wax FR80A due to its special mechanism of action.

[0189] The following table is the performance comparison data of the formulation in Example 1 and Competitive Products 1-2:

[0190] From the comparison of Example 1 and Formulations 2-4, it can be seen that the hot melt adhesive for irrigation water hose prepared in Formulation 1 can

[0191] Product name Viscosity Softening point Brittle fracture temperature Breaking elongation Tensile strength 24h thermal stability Our company T~704AL 9811 cps 95℃ -1 140％ 8.6 Mpa 10892 cps Competitor 1 Tongde 8690 cps 92℃ 3 125％ 7.6 Mpa 11276 cps Competitor 2 Huayang hot melt adhesive 11866 cps 110℃ 7 110％ 7.7 Mpa 15261 cps

[0192] For bonding between polyester and PVC materials, it has the following advantages: 1. Low material covering temperature, about 80-90°C, high thermal sensitivity requirement, good adhesion to the substrate; 2. PVC material covering requires a dry surface, and the roll is not re-sticky; 3. Environmental adaptability requirement, irrigation water hose is widely used in various regions, and has low temperature and high temperature resistance requirements in some regions.

[0193] Example 1 and the hot melt adhesive for irrigation water hose in the comparison were used to prepare irrigation water hoses:

[0194] 1) After cooling water cooling and film blowing forming and rolling at a temperature not higher than 12°C, the film surface does not stick together in a 50°C oven, and the roll cannot be pulled open;

[0195] 2) The hot melt adhesive is heated to a normal use temperature of 165°C, and the film surface does not have obvious crystal points (the film surface in the comparative example has obvious crystal points).

[0196] 3) After normal rolling of the irrigation water hose and placing for 24 hours, the adhesion strength of the inner film and the outer polypropylene wire braid layer is required to be greater than or equal to 15 N / mm in a width of 50 mm (the adhesion strength of the irrigation water hose prepared by the hot melt adhesive in the comparative example is less than 15 N / mm);

[0197] 4) The inner membrane and the outer polypropylene filament woven layer of the water hose do not produce delamination after 30 days of observation before and after the test in a static state at an outdoor high temperature of 75°C (the inner membrane and the outer polypropylene filament woven layer of the irrigation water hose prepared by using the hot melt adhesive of the comparative example produce delamination phenomenon after 10 days); the inner membrane does not become hard at a low temperature of -25°C (the inner membrane of the irrigation water hose prepared by using the hot melt adhesive of the comparative example becomes hard at -25°C, producing crack and even breakage phenomenon).

[0198] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent transformation made by using the present application is within the patent protection scope of the present application.

Claims

1. An agricultural irrigation water hose, characterized in that, Including settings from top to bottom: Woven layer (11); Hot melt adhesive layer (12); Inner membrane layer (13); The braided layer is made of polypropylene yarn; The hot melt adhesive layer formulation comprises the following components in parts by weight: EVAP28400 15-25 copies; EVAP20020 8-15 copies; EVAEA33045 17-25 copies; Water-white rosin resin KS2100W 10-25 parts; 15-20 parts of hydrogenated petroleum resin 5600; Fischer-Tropsch wax 10-15 parts; Low-density oxidized polyethylene wax A-C629A, 1-2 parts; Antioxidant 0.5-1 part.

2. The agricultural irrigation water belt according to claim 1, characterized in that, The Fischer-Tropsch wax is refined Fischer-Tropsch wax FR80A.

3. The agricultural irrigation water belt according to claim 1, characterized in that, The antioxidant is antioxidant 1010.

4. The agricultural irrigation water belt according to claim 1, characterized in that, The inner membrane layer (13) is a PE membrane, and the thickness of the inner membrane layer (13) is 0.12 to 0.15 mm.

5. The agricultural irrigation water belt according to claim 1, characterized in that, The thickness of the braided layer is 0.4–0.5 mm.

6. The agricultural irrigation water belt according to claim 1, characterized in that, The thickness of the hot melt adhesive layer (12) is 0.08 to 0.1 mm.

7. A method for preparing agricultural irrigation water belts according to any one of claims 1 to 6, characterized in that, The preparation steps include the following: S1 unwinds the inner film layer (13) through the guide roller; S2 The braided layer (11) coated with hot melt adhesive layer (12) melts under heating conditions, and the inner membrane layer (13) is bonded to the braided layer (11) under the pressure generated by the expansion of the heating pipe and water hose. The S3 water hose is cooled by air cooling in a cooling box, and the cooled water hose is then used for agricultural irrigation.

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