Bio-based high-adhesion hot melt adhesive as well as preparation method and application thereof

Abstract

The invention relates to a bio-based high-adhesion hot melt adhesive as well as a preparation method and application thereof, and belongs to the technical field of adhesives. The hot melt adhesive is prepared by taking bio-based matrix resin compounded by castor oil-based polyamide and bio-based PBAT as a core, matching with a bio-based tackifier and a plasticizer, and supplementing with a cross-linking agent, an antioxidant, a compatibility regulator and a modified inorganic reinforcing filler. The preparation method comprises the steps of raw material drying, filler modification, melt mixing by a twin-screw extruder, cross-linking reaction, filler dispersion, extrusion pelletizing and the like. The bio-based hot melt adhesive provided by the invention solves the problems of insufficient bonding strength, poor heat resistance, poor storage stability and the like of the traditional bio-based hot melt adhesive, has environmental protection property and excellent comprehensive performance, can be applied to the fields of wood bonding, packaging and printing, textile compounding and electronic component packaging, and can complete bonding after being heated, melted and pressurized during use.

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, and relates to a bio-based high-adhesion hot melt adhesive, its preparation method and application. Background Technology

[0002] Hot melt adhesives, as solvent-free and fast-curing adhesives, are widely used in various industries due to their advantages such as convenient application, high efficiency, and low pollution. However, with the increasing global awareness of environmental protection and the increasing depletion of fossil resources, hot melt adhesives that traditionally rely on petroleum-based raw materials (such as polyethylene, polypropylene, and petroleum-based polyamides) face the dual challenges of resource shortages and environmental pressures. Furthermore, they are difficult to degrade after disposal, easily causing white pollution.

[0003] To address the aforementioned issues, bio-based hot melt adhesives have become a research hotspot. Existing bio-based hot melt adhesives primarily use starch, plant proteins, bio-based polyamides, and bio-based polyesters as their main raw materials, but they generally suffer from the following technical shortcomings:

[0004] 1. Insufficient bonding strength: Bio-based raw materials have poor molecular structure regularity and weak interaction with the surface of the adhered material. Especially in humid or high-temperature environments, the bonding performance drops significantly, making it difficult to meet the high-strength bonding requirements of wood, metal, etc.

[0005] 2. Poor heat resistance: Most bio-based hot melt adhesives have a softening point below 100℃ and are prone to creep and debonding in environments above 80℃, which limits their application in high-temperature conditions such as electronics and automobiles.

[0006] 3. Poor storage stability: Bio-based components are prone to oxidation and hydrolysis, which leads to excessive changes in the softening point and poor flowability of the hot melt adhesive during storage, affecting the construction effect;

[0007] 4. Poor formulation compatibility: The bio-based main material is not compatible with the additives (such as thickeners and antioxidants), which can easily lead to problems such as layering and precipitation, further reducing product performance.

[0008] In existing technologies, some solutions improve performance by adding fossil-based additives (such as petroleum-based tackifiers and synthetic antioxidants), but at the expense of bio-based content and environmental friendliness. Other solutions optimize the proportions of the main materials, but fail to address the issue of poor synergistic effects between components, making it difficult to simultaneously achieve high adhesion, heat resistance, and storage stability. Therefore, developing a hot melt adhesive with high bio-based content, excellent adhesive strength, good heat resistance, and storage stability has significant practical implications and market value. Summary of the Invention

[0009] The purpose of this invention is to provide a bio-based high-adhesion hot melt adhesive, its preparation method, and its applications. This hot melt adhesive, primarily composed of bio-based raw materials, achieves a balance of high adhesive strength, excellent heat resistance, long-term storage stability, and environmental friendliness through optimized formulation and proportions, thus meeting the high-strength bonding requirements of multiple fields.

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] A bio-based high-adhesion hot melt adhesive comprises the following components in parts by weight: 40-60 parts of bio-based main resin, 20-35 parts of bio-based tackifier, 5-15 parts of bio-based plasticizer, 1-5 parts of crosslinking agent, 0.5-3 parts of antioxidant, 1-4 parts of compatibility modifier, and 2-8 parts of inorganic reinforcing filler.

[0012] The bio-based main resin is composed of bio-based polyamide and bio-based PBAT in a mass ratio of 3:1-5:1;

[0013] The bio-based polyamide is castor oil-based polyamide.

[0014] As a preferred embodiment of the present invention, the bio-based thickener is selected from one or more of rosin glycerol ester, hydrogenated rosin pentaerythritol ester, and terpene phenolic resin.

[0015] As a preferred embodiment of the present invention, the bio-based plasticizer is selected from one or two of tributyl citrate and epoxidized soybean oil, and the mass ratio of the two when they are mixed is 1-3:1.

[0016] As a preferred embodiment of the present invention, the crosslinking agent is selected from isophorone diisocyanate and hexamethylene diisocyanate trimer.

[0017] As a preferred embodiment of the present invention, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1-2:1.

[0018] As a preferred embodiment of the present invention, the compatibility modifier is selected from polyethylene glycol monomethyl ether and polyglycerol ricinoleate.

[0019] As a preferred embodiment of the present invention, the inorganic reinforcing filler is selected from one of nano-calcium carbonate with a particle size of 50-100nm and nano-silica with a particle size of 20-50nm, and is surface modified by silane coupling agent KH-550. During modification, the mass ratio of inorganic reinforcing filler to silane coupling agent is 100:1-3.

[0020] A method for preparing the bio-based high-adhesion hot melt adhesive as described above includes the following steps:

[0021] W1. Dry the bio-based main resin, bio-based tackifier, and bio-based plasticizer in an oven at 60-80℃ for 4-6 hours; mix the inorganic reinforcing filler with the silane coupling agent and stir at high speed for 10-15 minutes to complete the modification;

[0022] W2. Add the bio-based main resin to the twin-screw extruder, set the temperature of each section to 140-180℃, and the screw speed to 80-120r / min. After melting, add the bio-based thickener, bio-based plasticizer, and compatibility modifier, and mix for 20-30 minutes.

[0023] W3. Adjust the head temperature to 155-165℃, add crosslinking agent and antioxidant, and react for 10-15 minutes;

[0024] W4. Add the modified inorganic reinforcing filler, increase the screw speed to 150-180 r / min, and stir for 15-20 minutes;

[0025] W5. After extrusion, cool to room temperature and pelletize to obtain the product.

[0026] As a preferred embodiment of the present invention, the specific temperatures of each section of the twin-screw extruder are: Zone 1 140-160℃, Zone 2 160-170℃, Zone 3 170-180℃, and Die Head 165-175℃.

[0027] An application of the aforementioned bio-based high-adhesion hot melt adhesive is found in wood bonding, packaging printing, textile lamination, or electronic component encapsulation. When used, it is heated to 160-190℃ to melt, and after application, pressure of 0.3-0.5 MPa is applied for 10-30 seconds to complete the bonding process.

[0028] The beneficial effects of this invention are:

[0029] (1) By compounding the bio-based main resin, introducing crosslinking agents and modifying with inorganic reinforcing fillers, the hot melt adhesive has high tensile shear bonding strength, which can meet the requirements of high-strength bonding.

[0030] (2) Softening point ≥120℃, bonding strength retention rate ≥85% after 72 hours of heat aging at 120℃, softening point change rate ≤5% after 6 months of storage at room temperature, which solves the problems of poor heat resistance and easy aging of traditional bio-based hot melt adhesives.

[0031] (3) By improving the synergistic effect of components through compatibility regulators, the product has good uniformity, excellent melt flowability, and a wide construction temperature range (160-190℃), making it suitable for a variety of construction equipment and substrates. Detailed Implementation

[0032] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0033] Experimental materials

[0034] Bio-based polyamide (Rilsan® PA11);

[0035] Bio-based PBAT (Dongguan Nabaichuan Plastics Co., Ltd. 3052D);

[0036] Rosin glyceryl ester (Fujian Xingli New Materials Co., Ltd. 138);

[0037] Hydrogenated rosin pentaerythritol ester (Jiangsu Bosite Chemical Technology Co., Ltd.);

[0038] Tributyl citrate (Liaocheng Xinli New Materials Co., Ltd.);

[0039] Epoxidized soybean oil (Changzhou Senlang Chemical Co., Ltd.);

[0040] Isophorone diisocyanate (Shandong Xuchen Chemical Technology Co., Ltd.);

[0041] Hexamethylene diisocyanate trimer (Jinan Yucai Chemical Co., Ltd.);

[0042] Antioxidant 1010 (Jiangsu Xinluda Polymer Materials Co., Ltd.);

[0043] Antioxidant 168 (Jiangsu Xinluda Polymer Materials Co., Ltd.);

[0044] Polyethylene glycol monomethyl ether (Shandong Tengbo Chemical Technology Co., Ltd.);

[0045] Polyglycerol ricinoleate (Wuhan Chengtian Fine Chemical Co., Ltd.);

[0046] Nano-sized calcium carbonate (80nm particle size);

[0047] Nano-sized silica (30nm particle size);

[0048] Silane coupling agent KH-550 (Guangzhou Zhongjie New Materials Co., Ltd.);

[0049] Petroleum-based polyamide PA6 (Jiangsu Weirun High Plastics Co., Ltd.);

[0050] Petroleum-based tackifier C5 petroleum resin (Zhengzhou Jiajie Chemical Products Co., Ltd.)

[0051] Table 1. Formulation composition (parts by weight) of Examples 1-3

[0052]

[0053] Example 1

[0054] 1. Place 30 parts of bio-based polyamide, 15 parts of rosin glycerol ester, 10 parts of hydrogenated rosin pentaerythritol ester, 8 parts of tributyl citrate, and 2 parts of epoxidized soybean oil in a 60℃ oven and dry for 6 hours to remove moisture; mix 4 parts of nano calcium carbonate with 0.08 parts of silane coupling agent KH-550 and stir at 1500r / min for 15 minutes in a high-speed mixer to complete the surface modification.

[0055] 2. Add the dried bio-based polyamide and 10 parts of bio-based PBAT to the hopper of a twin-screw extruder. Set the temperature of zone 1 to 140℃, zone 2 to 160℃, zone 3 to 170℃, and the die head to 165℃. Set the screw speed to 80 r / min. After the resin is completely melted, add the dried bio-based tackifier, bio-based plasticizer, and 2 parts of polyethylene glycol monomethyl ether sequentially through the side feed port. Continue to melt and mix for 30 minutes.

[0056] 3. Adjust the head temperature to 155℃, and slowly add 2 parts IPDI, 0.8 parts antioxidant 1010 and 0.6 parts antioxidant 168 through the metering pump. Keep the screw speed at 80r / min and continue the reaction for 15 minutes.

[0057] 4. Add the pretreated nano-calcium carbonate to the molten system, increase the screw speed to 150 r / min, and stir at high speed for 20 minutes to ensure that the filler is evenly dispersed.

[0058] 5. The uniformly mixed molten material is extruded into strips through the die head, cooled to room temperature of 25°C by the cooling roller, and then cut into 3mm long particles by the pelletizer to obtain the bio-based high-adhesion hot melt adhesive product.

[0059] Example 2

[0060] 1. Place 40 parts of bio-based polyamide, 18 parts of rosin glycerol ester, 10 parts of hydrogenated rosin pentaerythritol ester, 6 parts of tributyl citrate, and 4 parts of epoxidized soybean oil in a 70℃ oven and dry for 5 hours; mix 3 parts of nano calcium carbonate with 0.06 parts of silane coupling agent KH-550 and stir at 1800r / min for 12 minutes to complete the surface modification.

[0061] 2. Add the dried bio-based polyamide and 15 parts of bio-based PBAT to a twin-screw extruder. Set the temperature to 150°C in zone 1, 165°C in zone 2, 175°C in zone 3, and 170°C at the die head. Set the screw speed to 100 r / min. After melting, add the tackifier, plasticizer, and 3 parts of polyethylene glycol monomethyl ether in sequence and mix for 25 minutes.

[0062] 3. Adjust the head temperature to 160℃, add 1.5 parts IPDI, 0.6 parts antioxidant 1010 and 0.4 parts antioxidant 168, and maintain the speed for 12 minutes.

[0063] 4. Add modified nano calcium carbonate, increase the speed to 160 r / min, and stir for 18 minutes.

[0064] 5. After extrusion, cool to 25℃ and cut into 3mm pellets to obtain the product.

[0065] Example 3

[0066] 1. Place 38 parts of bio-based polyamide, 12 parts of rosin glycerol ester, 15 parts of hydrogenated rosin pentaerythritol ester, 5 parts of tributyl citrate, and 3 parts of epoxidized soybean oil in an oven at 80℃ and dry for 4 hours; mix 2 parts of nano calcium carbonate with 0.06 parts of silane coupling agent KH-550 and stir at 2000r / min for 10 minutes to complete the surface modification.

[0067] 2. Add the dried bio-based polyamide and 12 parts of bio-based PBAT to a twin-screw extruder, set the temperature to 160°C in zone 1, 170°C in zone 2, 180°C in zone 3, and 175°C at the die head, and the screw speed to 120 r / min. After melting, add the tackifier, plasticizer and 1 part of polyethylene glycol monomethyl ether, and mix for 20 minutes.

[0068] 3. Adjust the head temperature to 165℃, add 2.5 parts IPDI, 0.7 parts antioxidant 1010 and 0.5 parts antioxidant 168, and maintain the speed for 10 minutes.

[0069] 4. Add modified nano calcium carbonate, increase the speed to 180 r / min, and stir for 15 minutes.

[0070] 5. After extrusion, cool to 25℃ and cut into 3mm pellets to obtain the product.

[0071] Comparative Example 1

[0072] The non-bio-based PBAT was used, and the bio-based polyamide was increased to 55 parts. The remaining components and preparation steps were the same as in Example 3.

[0073] Comparative Example 2

[0074] The non-bio-based polyamide was used, and the bio-based PBAT was increased to 55 parts. The remaining components and preparation steps were the same as in Example 3.

[0075] Comparative Example 3

[0076] No crosslinking agent was used; the remaining components and preparation steps are the same as in Example 3.

[0077] Comparative Example 4

[0078] The crosslinking agent was replaced with an equal amount of petroleum-based toluene diisocyanate, and the remaining components and preparation steps were as described in Example 3.

[0079] Comparative Example 5

[0080] The bio-based tackifier was replaced with an equal amount of C5 petroleum resin, and the remaining components and preparation steps were as described in Example 3.

[0081] Comparative Example 6

[0082] Without polyethylene glycol monomethyl ether, the remaining components and preparation steps are the same as in Example 3.

[0083] Comparative Example 7

[0084] The antioxidant used is only antioxidant 1010, and the other components and preparation steps are as described in Example 3.

[0085] Comparative Example 8

[0086] The antioxidant used is only antioxidant 168, and the other components and preparation steps are as described in Example 3.

[0087] Comparative Example 9

[0088] The inorganic reinforcing filler was unmodified nano-calcium carbonate, and the remaining components and preparation steps were as described in Example 3.

[0089] Comparative Example 10

[0090] The amount of inorganic reinforcing filler was increased to 15 parts, and the remaining components and preparation steps were as described in Example 3.

[0091] Comparative Example 11

[0092] The bio-based main resin was replaced with an equal amount of petroleum-based PA6, and the remaining components and preparation steps were as described in Example 3.

[0093] Comparative Example 12

[0094] The amount of crosslinking agent used was 0.5 parts, and the remaining components and preparation steps were as described in Example 3.

[0095] Performance testing

[0096] 1. Tensile shear bond strength:

[0097] ① Sample preparation: Select poplar wood boards with a moisture content of 8%-12%, cut them into standard samples of 25mm×100mm×5mm, sand the surface to be bonded with sandpaper until it is smooth and free of burrs, wipe the surface dust with anhydrous ethanol and then let it dry.

[0098] ② Applying adhesive and bonding: Place the hot melt adhesive granules in a hot melt adhesive coating machine, heat to 180℃ to melt, and then evenly coat them onto the bonding surface of one of the samples. The amount of adhesive applied should be controlled at 100±10g / m². Immediately align and bond the other sample to ensure that the bonding area is 25mm×25mm.

[0099] ③ Curing: Place the bonded sample on a press, apply a pressure of 0.4 MPa, hold for 20 seconds, then remove and cure in an environment of 25℃ and 50% relative humidity for 24 hours;

[0100] ④ Testing: Install the cured sample onto the fixture of the universal testing machine, set the test speed to 5 mm / min, and conduct a tensile shear test. Record the maximum load when the sample fails. Calculate the tensile shear bond strength according to "bond strength = maximum load / bond area". Test 5 parallel samples in each group and take the average value as the final result.

[0101] 2. Softening point:

[0102] ① Apparatus preparation: Clean the copper ring, steel ball, support and other parts of the globe with anhydrous ethanol and let them dry. Add glycerin to the beaker as a heating medium, ensuring that the glycerin liquid level can completely submerge the copper ring and is more than 25mm above the ring surface.

[0103] ② Sample preparation: Heat the hot melt adhesive particles to 180℃ to melt them, and slowly pour them into the copper ring. After the adhesive liquid cools to room temperature, use a blade to scrape off the excess adhesive material along the ring surface to ensure that the adhesive surface is flush with the ring surface.

[0104] ③ Assembly of the apparatus: Fix the copper ring containing the sample on the support, place it in the beaker, adjust the height of the support so that the bottom of the copper ring is 25mm from the bottom of the beaker, place the steel ball on the rubber surface in the center of the copper ring, and place a metal plate with a diameter of 15mm directly below the copper ring.

[0105] ④ Heating test: Place the beaker on a temperature-controlled heating device and heat it at a rate of 5±0.5℃ / min. Closely observe the falling of the steel ball. When the steel ball passes through the rubber layer and contacts the metal plate below due to the softening of the rubber, record the temperature at this time, which is the softening point. Test 3 parallel samples in each group and take the average value as the final result.

[0106] 3. Thermal stability: The test conditions were 120℃ for 72 hours, and the specific steps are as follows:

[0107] ① Initial strength test: According to the above "tensile shear bond strength" test method, first determine the initial tensile shear bond strength of the hot melt adhesive, and record it as P0;

[0108] ②Aging treatment: Take hot melt adhesive particles of the same specifications as those used in the initial strength test, spread them evenly in a petri dish (thickness ≤ 5 mm), place the petri dish in a constant temperature oven at 120℃, close the oven door and carry out heat aging. The aging time is strictly controlled to 72 hours. During the aging process, observe the sample status every 24 hours to ensure that there are no abnormal phenomena such as volatilization or combustion.

[0109] ③ Strength test after aging: Take out the aged hot melt adhesive particles, cool them to room temperature in an environment of 25℃, and then prepare the bonding sample, cure and test the tensile shear bond strength in the same way as the initial strength test, which is recorded as P1;

[0110] ④ Result calculation: The strength retention rate is calculated according to "thermal stability retention rate = (P1 / P0) × 100%". Five parallel samples are tested in each group, and the average value is taken as the final result.

[0111] 4. Storage stability: The test was conducted under the condition of storing at room temperature (25℃, relative humidity 50%) for 6 months. The specific steps are as follows:

[0112] ① Initial softening point test: According to the above "softening point" test method, first determine the initial softening point of the hot melt adhesive and record it as T0;

[0113] ② Storage and handling: Pack the hot melt adhesive granules into sealed polyethylene bags, remove the air from the bags and seal them, then store them in a constant temperature and humidity chamber at 25℃ and 50% relative humidity. During the storage period, check the sealing status once a month to ensure that there is no damage or moisture absorption.

[0114] ③ Softening point test after storage: After 6 months of storage, take out the hot melt adhesive particles, equilibrate them in an environment of 25°C for 2 hours, and then determine the softening point using the same method as the initial softening point test, and record it as T1;

[0115] ④ Result calculation: The change rate is calculated according to "the rate of change of softening point after storage = (|T1-T0| / T0)×100%". Three parallel samples are tested in each group, and the average value is taken as the final result.

[0116] 5. VOC content:

[0117] ① Sample preparation: Accurately weigh 5.0 g of hot melt adhesive particles (denoted as m0), place them in a 250 mL stoppered conical flask, add 100 mL of anhydrous ethanol as the extractant, seal the flask, place it in a constant temperature water bath shaker, and shake and extract for 2 hours at 50 °C and 150 r / min. After cooling to room temperature, filter the flask through a 0.45 μm organic phase filter membrane and collect the filtrate as the sample to be tested.

[0118] ②Chromatographic conditions: A gas chromatograph equipped with a flame ionization detector (FID) was used. The chromatographic column was an HP-5 capillary column (30m×0.32mm×0.25μm). The column temperature program was as follows: initial temperature 40℃, hold for 5 minutes, then increase to 250℃ at a rate of 10℃ / min and hold for 10 minutes; injection port temperature 250℃, detector temperature 280℃; carrier gas was nitrogen, flow rate 1.0mL / min; injection volume 1μL, split ratio 10:1.

[0119] ③ Plotting the standard curve: Prepare a series of VOC standard mixed solutions of different concentrations (such as methanol, ethanol, ethyl acetate and other common VOC components), inject and analyze them according to the above chromatographic conditions, and plot the standard curve with peak area as the ordinate and concentration as the abscissa.

[0120] ④ Sample determination: Inject the sample to be tested under the above chromatographic conditions, record the peak area of ​​each VOC component, calculate the concentration of each component according to the standard curve, and summarize the mass of all VOC components, which is recorded as m1.

[0121] ⑤ Result calculation: Calculate the VOC content (unit: g / L) according to "VOC content = (m1 / m0) × 1000". Test 3 parallel samples in each group and take the average value as the final result.

[0122] The test results are shown in Table 2.

[0123] Table 2 Performance test results of Examples 1-3 and Comparative Examples 1-12

[0124]

[0125]

[0126] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A bio-based high-adhesion hot melt adhesive, characterized in that, The product comprises the following components in parts by weight: 40-60 parts of bio-based main resin, 20-35 parts of bio-based tackifier, 5-15 parts of bio-based plasticizer, 1-5 parts of crosslinking agent, 0.5-3 parts of antioxidant, 1-4 parts of compatibility modifier, and 2-8 parts of inorganic reinforcing filler. The bio-based main resin is composed of bio-based polyamide and bio-based PBAT in a mass ratio of 3:1-5:1; The bio-based polyamide is castor oil-based polyamide.

2. The bio-based high-adhesion hot melt adhesive according to claim 1, characterized in that, The bio-based thickener is selected from one or more of rosin glycerol esters, hydrogenated rosin pentaerythritol esters, and terpene phenolic resins.

3. The bio-based high-adhesion hot melt adhesive according to claim 1, characterized in that, The bio-based plasticizer is selected from one or two of tributyl citrate and epoxidized soybean oil, and the mass ratio of the two when they are combined is 1-3:

1.

4. The bio-based high-adhesion hot melt adhesive according to claim 1, characterized in that, The crosslinking agent is selected from isophorone diisocyanate and hexamethylene diisocyanate trimer.

5. The bio-based high-adhesion hot melt adhesive according to claim 1, characterized in that, The antioxidant is a compound of antioxidant 1010 and antioxidant 168 in a mass ratio of 1-2:

1.

6. The bio-based high-adhesion hot melt adhesive according to claim 1, characterized in that, The compatibility modifier is selected from polyethylene glycol monomethyl ether and polyglycerol ricinoleate.

7. The bio-based high-adhesion hot melt adhesive according to claim 1, characterized in that, The inorganic reinforcing filler is selected from one of nano-calcium carbonate with a particle size of 50-100nm and nano-silica with a particle size of 20-50nm. It is surface modified by silane coupling agent KH-550. During modification, the mass ratio of inorganic reinforcing filler to silane coupling agent is 100:1-3.

8. A method for preparing a bio-based high-adhesion hot melt adhesive as described in any one of claims 1-7, characterized in that, Includes the following steps: W1. Dry the bio-based main resin, bio-based tackifier, and bio-based plasticizer in an oven at 60-80℃ for 4-6 hours; mix the inorganic reinforcing filler with the silane coupling agent and stir at high speed for 10-15 minutes to complete the modification; W2. Add the bio-based main resin to the twin-screw extruder, set the temperature of each section to 140-180℃, and the screw speed to 80-120r / min. After melting, add the bio-based thickener, bio-based plasticizer, and compatibility modifier, and mix for 20-30 minutes. W3. Adjust the head temperature to 155-165℃, add crosslinking agent and antioxidant, and react for 10-15 minutes; W4. Add the modified inorganic reinforcing filler, increase the screw speed to 150-180 r / min, and stir for 15-20 minutes; W5. After extrusion, cool to room temperature and pelletize to obtain the product.

9. The preparation method according to claim 8, characterized in that, The specific temperatures for each section of the twin-screw extruder are as follows: Zone 1: 140-160℃, Zone 2: 160-170℃, Zone 3: 170-180℃, and Die Head: 165-175℃.

10. An application of a bio-based high-adhesion hot melt adhesive as described in any one of claims 1-7, characterized in that, It is used in wood bonding, packaging printing, textile composites or electronic component packaging. When using it, heat it to 160-190℃ to melt it, and after coating, apply pressure of 0.3-0.5MPa for 10-30 seconds to complete the bonding.

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