Preparation process of EVA (Ethylene Vinyl Acetate) hot melt adhesive with stable adhesion

Abstract

The invention relates to the technical field of hot melt adhesives, and discloses a preparation process of an EVA (ethylene-vinyl acetate) hot melt adhesive with stable adhesion, which comprises the following steps: preparing the following components in parts by weight: 30-60 parts of EVA resin, 6-10 parts of synthetic wax, 3-15 parts of paraffin, 20-30 parts of tackifying resin, 0.5-1.2 parts of pentaerythritol triacrylate, 1-2 parts of antioxidant and 10-25 parts of isobutyltriethoxysilane; s2, EVA resin, synthetic wax, paraffin, pentaerythritol triacrylate and isobutyl triethoxy silicon are added into a reaction kettle according to the weight parts in the step S1, heating is conducted while stirring is conducted to 90-150 DEG C, uniform stirring is conducted, and the stirring rotating speed is 120-200 r / min; then adding an antioxidant into the reaction kettle, continuously heating to 150-180 DEG C, and stirring until the materials are uniformly mixed; the isobutyltriethoxysilane is added and can chemically react with water molecules in air to form a permanent and firm environment-friendly waterproof layer, so that the EVA hot melt adhesive has a certain waterproof effect, and the adhesion of the EVA hot melt adhesive is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, in particular to a preparation process of an EVA hot melt adhesive with stable adhesion. Background Art

[0002] Hot melt adhesive is a solid adhesive that does not contain volatile organic solvents and is made by melting and mixing thermoplastic resin or elastomer as the main component, and plasticizer, viscosity regulator, antioxidant and filler as the auxiliary components. It is a hot direction in the adhesive market because of its safety, non-toxicity, environmental friendliness and simple preparation. Hot melt adhesive is a highly plastic adhesive that changes its physical state with temperature within a certain temperature range, while its chemical properties remain unchanged. It is non-toxic, pollution-free and does not contain volatile organic solvents. It is an environmentally friendly adhesive. It is a solvent-free, moisture-free, 100% solid fusible polymer. It is solid at room temperature. When heated and melted to a certain degree, it becomes a liquid adhesive that can flow and has a certain viscosity. After cooling and solidification, it forms adhesion to the substrate. It can be melted again when heated again, and it becomes liquid again and can be bonded to the adherend. It has a certain re-adhesion.

[0003] EVA hot melt adhesive is a widely used hot melt adhesive variety with excellent bonding performance, good applicability to a variety of materials, good compatibility with compounding agents, and good economic applicability. It is used in many fields such as book binding, wood board pressing plate production, and furniture edge banding. However, the existing EVA hot melt adhesive has poor waterproof performance, which makes it easy to affect the bonding stability of the EVA hot melt adhesive after contact with water, resulting in poor bonding strength and affecting its normal use effect. To this end, we propose a preparation process of EVA hot melt adhesive with stable adhesion. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of an EVA hot melt adhesive with stable adhesion, thereby solving the problems in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a preparation process of an EVA hot melt adhesive with stable adhesion, comprising the following steps:

[0006] S1: prepare the following components in parts by weight: 30-60 parts of EVA resin, 6-10 parts of synthetic wax, 3-15 parts of paraffin wax, 20-30 parts of tackifying resin, 0.5-1.2 parts of pentaerythritol triacrylate, 1-2 parts of antioxidant, and 10-25 parts of isobutyl triethoxysilane;

[0007] S2: Add EVA resin, synthetic wax, paraffin, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 90-150° C. while stirring, stir evenly, and stir at a speed of 120-200 r / min;

[0008] S3: Then add antioxidant to the reactor, continue heating to 150-180°C, and stir until the mixture is evenly mixed;

[0009] S4: Add tackifying resin to the reaction kettle, stir for 40-60 minutes, and then cool to 110-140°C;

[0010] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0011] Preferably, the synthetic wax is polyethylene wax.

[0012] Preferably, the antioxidant is one of butylated hydroxytoluene and butylated hydroxyanisole.

[0013] Preferably, the weight ratio of the EVA resin to the synthetic wax is 1:(2-8).

[0014] Preferably, the tackifying resin is at least one of petroleum resin, terpene resin and rosin resin.

[0015] Preferably, the stirring time in S2 is 2-3 h.

[0016] Preferably, the stirring time in S3 is 20-50 min.

[0017] Preferably, the melt index of the EVA resin is 20-60 g / min.

[0018] The present invention provides a preparation process of an EVA hot melt adhesive with stable adhesion. The preparation process of an EVA hot melt adhesive with stable adhesion has the following beneficial effects:

[0019] (1) The preparation process of the EVA hot melt adhesive with stable adhesion can chemically react with water molecules in the air by adding isobutyl triethoxysilane to form a permanent and firm environmentally friendly waterproof layer, so that the EVA hot melt adhesive has a certain waterproof effect and ensures its adhesion;

[0020] (2) The preparation process of the EVA hot melt adhesive with stable adhesion, by selecting one or more of petroleum resin, terpene resin and rosin resin as tackifying resin, can not only make the hot melt adhesive have good flexibility, but also improve the bonding strength of the hot melt adhesive, and the VOC content is low, which greatly improves the stability of the adhesion of the EVA hot melt adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] Embodiment 1:

[0025] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0026] S1: Prepare the following components in parts by weight: 30 parts of EVA resin, 6 parts of synthetic wax, 3 parts of paraffin wax, 20 parts of tackifying resin, 0.5 parts of pentaerythritol triacrylate, 1 part of antioxidant, and 10 parts of isobutyl triethoxysilane;

[0027] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxytoluene; the weight ratio of EVA resin to synthetic wax is 1:2; the tackifying resin is petroleum resin; the melt index of EVA resin is 20g / min;

[0028] S2: Add EVA resin, synthetic wax, paraffin wax, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 90° C. while stirring, stir evenly, and stir at a speed of 120 r / min;

[0029] The stirring time is 2h;

[0030] S3: Then add antioxidant to the reactor, continue heating to 150°C, and stir until the mixture is evenly mixed;

[0031] The stirring time is 20 min;

[0032] S4: Add tackifying resin to the reactor, stir for 40 minutes, and then cool to 110°C;

[0033] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0034] Embodiment 2:

[0035] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0036] S1: Prepare the following components in parts by weight: 60 parts of EVA resin, 10 parts of synthetic wax, 15 parts of paraffin wax, 30 parts of tackifying resin, 1.2 parts of pentaerythritol triacrylate, 2 parts of antioxidant, and 25 parts of isobutyl triethoxysilane;

[0037] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxyanisole; the weight ratio of EVA resin to synthetic wax is 1:8; the tackifying resin is terpene resin; the melt index of EVA resin is 60g / min;

[0038] S2: Add EVA resin, synthetic wax, paraffin, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 150° C. while stirring, stir evenly, and stir at a speed of 200 r / min;

[0039] The stirring time is 3h;

[0040] S3: Then add antioxidant to the reactor, continue heating to 180°C, and stir until the mixture is evenly mixed;

[0041] The stirring time is 50min;

[0042] S4: Add tackifying resin to the reactor, stir for 60 minutes, and then cool to 140°C;

[0043] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0044] Embodiment three:

[0045] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0046] S1: Prepare the following components in parts by weight: 40 parts of EVA resin, 7 parts of synthetic wax, 4 parts of paraffin wax, 21 parts of tackifying resin, 0.6 parts of pentaerythritol triacrylate, 1.1 parts of antioxidant, and 11 parts of isobutyl triethoxysilane;

[0047] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxytoluene; the weight ratio of EVA resin to synthetic wax is 1:3; the tackifying resin is rosin resin; the melt index of EVA resin is 30g / min;

[0048] S2: Add EVA resin, synthetic wax, paraffin wax, pentaerythritol triacrylate and isobutyl triethoxysilane into a reaction kettle according to the weight proportions in S1, heat to 100° C. while stirring, stir evenly, and stir at a speed of 130 r / min;

[0049] The stirring time was 2.1 h;

[0050] S3: Then add antioxidant to the reactor, continue heating to 160°C, and stir until the mixture is evenly mixed;

[0051] The stirring time is 30 minutes;

[0052] S4: Add tackifying resin to the reactor, stir for 41 minutes, and then cool to 120°C;

[0053] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0054] Embodiment 4:

[0055] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0056] S1: Prepare the following components in parts by weight: 50 parts of EVA resin, 8 parts of synthetic wax, 5 parts of paraffin wax, 22 parts of tackifying resin, 0.7 parts of pentaerythritol triacrylate, 1.2 parts of antioxidant, and 12 parts of isobutyl triethoxysilane;

[0057] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxyanisole; the weight ratio of EVA resin to synthetic wax is 1:4; the tackifying resin is petroleum resin; the melt index of EVA resin is 40g / min;

[0058] S2: Add EVA resin, synthetic wax, paraffin wax, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 110° C. while stirring, stir evenly, and stir at a speed of 130 r / min;

[0059] The stirring time is 2.2h;

[0060] S3: Then add antioxidant to the reactor, continue heating to 170°C, and stir until the mixture is evenly mixed;

[0061] The stirring time is 40 minutes;

[0062] S4: Add tackifying resin to the reactor, stir for 42 minutes, and then cool to 130°C;

[0063] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0064] Embodiment five:

[0065] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0066] S1: Prepare the following components in parts by weight: 50 parts of EVA resin, 9 parts of synthetic wax, 6 parts of paraffin wax, 23 parts of tackifying resin, 0.8 parts of pentaerythritol triacrylate, 1.3 parts of antioxidant, and 13 parts of isobutyl triethoxysilane;

[0067] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxyanisole; the weight ratio of EVA resin to synthetic wax is 1:5; the tackifying resin is terpene resin; the melt index of EVA resin is 50g / min;

[0068] S2: Add EVA resin, synthetic wax, paraffin, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 120° C. while stirring, stir evenly, and stir at a speed of 160 r / min;

[0069] The stirring time is 2.3h;

[0070] S3: Then add antioxidant to the reactor, continue heating to 155°C, and stir until the mixture is evenly mixed;

[0071] The stirring time is 25min;

[0072] S4: Add tackifying resin to the reactor, stir for 45 minutes, and then cool to 115°C;

[0073] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0074] Embodiment six:

[0075] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0076] S1: Prepare the following components in parts by weight: 55 parts of EVA resin, 9 parts of synthetic wax, 14 parts of paraffin wax, 29 parts of tackifying resin, 1.1 parts of pentaerythritol triacrylate, 1.9 parts of antioxidant, and 24 parts of isobutyl triethoxysilane;

[0077] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxytoluene; the weight ratio of EVA resin to synthetic wax is 1:7; the tackifying resin is rosin resin; the melt index of EVA resin is 55g / min;

[0078] S2: Add EVA resin, synthetic wax, paraffin, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 140° C. while stirring, stir evenly, and stir at a speed of 190 r / min;

[0079] The stirring time is 2.9h;

[0080] S3: Then add antioxidant to the reactor, continue heating to 175°C, and stir until the mixture is evenly mixed;

[0081] The stirring time is 45 minutes;

[0082] S4: Add tackifying resin to the reactor, stir for 55 minutes, and then cool to 135°C;

[0083] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0084] Embodiment seven:

[0085] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0086] S1: Prepare the following components in parts by weight: 57 parts of EVA resin, 8.5 parts of synthetic wax, 12 parts of paraffin wax, 27 parts of tackifying resin, 0.9 parts of pentaerythritol triacrylate, 1.7 parts of antioxidant, and 23 parts of isobutyl triethoxysilane;

[0087] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxyanisole; the weight ratio of EVA resin to synthetic wax is 1:5.5; the tackifying resin is petroleum resin; the melt index of EVA resin is 45g / min;

[0088] S2: Add EVA resin, synthetic wax, paraffin wax, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 130° C. while stirring, stir evenly, and stir at a speed of 180 r / min;

[0089] The stirring time is 2.7h;

[0090] S3: Then add antioxidant to the reactor, continue heating to 165°C, and stir until the mixture is evenly mixed;

[0091] The stirring time is 47 minutes;

[0092] S4: Add tackifying resin to the reactor, stir for 57 minutes, and then cool to 125°C;

[0093] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0094] Embodiment eight:

[0095] A preparation process of an EVA hot melt adhesive with stable adhesion comprises the following steps:

[0096] S1: Prepare the following components in parts by weight: 48 parts of EVA resin, 7.5 parts of synthetic wax, 6.5 parts of paraffin wax, 26 parts of tackifying resin, 0.8 parts of pentaerythritol triacrylate, 1.6 parts of antioxidant, and 23 parts of isobutyl triethoxysilane;

[0097] The synthetic wax is polyethylene wax; the antioxidant is butylated hydroxyanisole; the weight ratio of EVA resin to synthetic wax is 1:5.5; the tackifying resin is terpene resin; the melt index of EVA resin is 35g / min;

[0098] S2: Add EVA resin, synthetic wax, paraffin wax, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 135° C. while stirring, stir evenly, and stir at a speed of 185 r / min;

[0099] The stirring time is 2.6h;

[0100] S3: Then, an antioxidant is added to the reactor, and the mixture is heated to 166° C. and stirred until the mixture is uniformly mixed;

[0101] The stirring time is 46 minutes;

[0102] S4: Add tackifying resin to the reactor, stir for 56 minutes, and then cool to 134°C;

[0103] S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

[0104] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A process for preparing an EVA hot melt adhesive with stable adhesion, characterized in that: The following steps are involved: S1: prepare the following components in parts by weight: 30-60 parts of EVA resin, 6-10 parts of synthetic wax, 3-15 parts of paraffin wax, 20-30 parts of tackifying resin, 0.5-1.2 parts of pentaerythritol triacrylate, 1-2 parts of antioxidant, and 10-25 parts of isobutyl triethoxysilane; S2: Add EVA resin, synthetic wax, paraffin, pentaerythritol triacrylate and isobutyl triethoxysilane into the reaction kettle according to the weight proportions in S1, heat to 90-150° C. while stirring, stir evenly, and stir at a speed of 120-200 r / min; S3: Then add antioxidant to the reactor, continue heating to 150-180°C, and stir until the mixture is evenly mixed; S4: Add tackifying resin to the reaction kettle, stir for 40-60 minutes, and then cool to 110-140°C; S5: Finally, cool to room temperature under the protection of nitrogen to obtain the product.

2. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The synthetic wax is polyethylene wax.

3. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The antioxidant is one of butylated hydroxytoluene and butylated hydroxyanisole.

4. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The weight ratio of the EVA resin to the synthetic wax is 1:(2-8).

5. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The tackifying resin is at least one of petroleum resin, terpene resin and rosin resin.

6. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The stirring time in S2 is 2-3 h.

7. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The stirring time in S3 is 20-50 min.

8. The process for preparing an EVA hot melt adhesive with stable adhesion according to claim 1, characterized in that: The melt index of the EVA resin is 20-60 g / min.

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