A removable glue and a method for preparing the same

Abstract

The application relates to the technical field of C09J153 / 00, in particular to a removable glue and a preparation method thereof. A removable glue is prepared from the following raw materials in parts by weight: 80-100 parts of rubber, 30-50 parts of resin, 10-20 parts of softening agent and 1-3 parts of additive, wherein the resin is tackifying resin. The application can improve the technical problem that the removable glue can have certain balance effect in keeping adhesion and removability by limiting the use of microcrystalline wax. The application can improve the good wetting capacity of the removable glue to the surface of a pasted object by limiting the use of oxygen-containing silane compounds.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of C09J153 / 00, and particularly relates to a removable adhesive and a preparation method thereof. BACKGROUND

[0002] A BOPP film special hot melt pressure sensitive adhesive and a preparation method thereof are disclosed in Chinese Patent No. CN202111131271.7, which adopts petroleum resin, maleic anhydride grafted polyethylene, SIS, tackifying synergist and other raw materials to prepare the hot melt pressure sensitive adhesive, and the tackifying synergist is prepared to improve the bonding strength of the hot melt pressure sensitive adhesive, but the problem of improving the removability of the adhesive is not disclosed and solved. SUMMARY

[0003] In order to solve the above problems, the application provides a removable adhesive, and preparation raw materials include rubber 80-100 parts, resin 30-50 parts, softening agent 10-20 parts and additive 1-3 parts by weight.

[0004] The preparation raw materials further include antioxidant 1.2-2 parts.

[0005] Preferably, the rubber is selected from one or more of styrene-isoprene-styrene block copolymer, hydrogenated styrene-butadiene block copolymer and styrene-butadiene-styrene block copolymer.

[0006] Preferably, the rubber is a combination of styrene-isoprene-styrene block copolymer and styrene-butadiene-styrene block copolymer, and the weight ratio is 1:(0.5-1).

[0007] Preferably, the content of styrene in the styrene-butadiene-styrene block copolymer is 10-30%.

[0008] Preferably, the content of styrene in the styrene-butadiene-styrene block copolymer is 15%.

[0009] The melting index of the styrene-isoprene-styrene block copolymer under 200℃ / 5kg is 0.7g / 10min, and the purchasing manufacturer of the styrene-isoprene-styrene block copolymer is Balin Petrochemical, and the model is YH-1106.

[0010] The melting index of the styrene-butadiene-styrene block copolymer under 200℃ / 5kg is 3-5g / 10min, and the purchasing manufacturer of the styrene-butadiene-styrene block copolymer is Balin Petrochemical, and the model is YH 792.

[0011] Preferably, the tackifying resin is selected from one or more of petroleum resin, rosin resin, terpene resin.

[0012] Preferably, the softening point of the tackifying resin is 100-120℃.

[0013] Preferably, the petroleum resin is selected from C5 petroleum resin or C9 petroleum resin.

[0014] Preferably, the petroleum resin is C5 petroleum resin.

[0015] The softening point of the C5 petroleum resin is 110℃, and the manufacturer is Eastman, USA.

[0016] Preferably, the softening agent is selected from one or more of naphthenic oil, paraffin wax, white oil.

[0017] Preferably, the paraffin wax is microcrystalline paraffin wax.

[0018] The microcrystalline paraffin wax is full refined paraffin wax, and the manufacturer is Shandong Jinghao Chemical Co., Ltd., and the model is 56#.

[0019] In order to improve the initial tack and peel force of the removable adhesive, the present applicant found that the use of microcrystalline paraffin wax can improve the technical problem that the removable adhesive can have a certain balance effect in maintaining adhesion and removability. By adding microcrystalline paraffin wax, the microcrystalline paraffin wax can improve the mutual synergistic effect of the composition of petroleum resin and styrene-isoprene-styrene block copolymer and styrene-butadiene-styrene block copolymer after high-temperature heating, improve the compatibility, thereby improving the bonding performance of the removable adhesive, improving the initial tack and peel force of the removable adhesive, and improving the removability, so that the removable adhesive can have a certain balance effect in maintaining adhesion and removability.

[0020] Preferably, the auxiliary agent is an oxygen-containing silane compound.

[0021] Preferably, the oxygen-containing silane compound is selected from one or more of vinyltriethoxysilane, vinylpropyltrimethoxysilane, and vinylmethyltrimethoxysilane.

[0022] Preferably, the oxygen-containing silane compound is vinyltriethoxysilane.

[0023] In order to make the removable adhesive have good wetting ability to the surface of the adherend, the applicant finds that the removable adhesive prepared by mixing vinyl triethoxysilane with the resin and microcrystalline wax and then mixing with the composition of styrene-isoprene-styrene block copolymer and styrene-butadiene-styrene block copolymer has good wetting ability, and the possible reason is that the unsaturated bond in the vinyl triethoxysilane can link the styrene-isoprene-styrene block copolymer and the styrene-butadiene-styrene block copolymer, thereby improving the cohesion between the molecular chains in the removable adhesive, so that the removable adhesive can have good wetting ability to the surface of the adherend when it is in contact with the adherend.

[0024] The second aspect of the present application provides a preparation method of a removable adhesive, comprising the following steps:

[0025] S1. The resin, softening agent and auxiliary agent are added to a stirring device for stirring and heating to 110-130 DEG C to obtain a mixture a;

[0026] S2. The rubber is added to the mixture a for mixing and heating to 170-190 DEG C, and then vacuumizing to obtain the removable adhesive.

[0027] Advantages

[0028] The present application improves the initial adhesion and peeling force of the removable adhesive by the mutual cooperation of the specific rubber and tackifying resin.

[0029] The present application can improve the balance between the adhesion and removability of the removable adhesive by limiting the use of microcrystalline wax.

[0030] The present application can improve the good wetting ability of the removable adhesive to the surface of the adherend by limiting the use of oxygen-containing silane compounds.

[0031] The present application improves the removability and adhesion of the removable adhesive by limiting the ratio of the composition of the rubber. DETAILED DESCRIPTION

[0032] Example 1

[0033] A removable adhesive, the preparation raw materials comprising rubber 90 parts, resin 40 parts, softening agent 15 parts, auxiliary agent 2 parts, antioxidant 1.5 parts, and the resin is a tackifying resin.

[0034] A preparation method of a removable adhesive, comprising the following steps:

[0035] S1. The resin, softening agent and auxiliary agent are added to a stirring device for stirring and heating to 120 DEG C to obtain a mixture a;

[0036] S2. Add antioxidant, rubber to the mixture a, mix and heat to 185℃, and get removable glue after vacuumizing.

[0037] The rubber is styrene-isoprene-styrene (block copolymer and styrene-butadiene-styrene block copolymer composition, the weight ratio is 1:0.8.

[0038] The styrene-isoprene-styrene block copolymer is purchased from Balin Petrochemical, model YH-1106.

[0039] The styrene-butadiene-styrene block copolymer is purchased from Balin Petrochemical, model YH792.

[0040] The tackifying resin is C5 petroleum resin.

[0041] The C5 petroleum resin is purchased from Eastman.

[0042] The softening agent is microcrystalline wax.

[0043] The microcrystalline wax is purchased from Shandong Jinghao Chemical Co., Ltd., model 56#.

[0044] The antioxidant is distearyl pentaerythritol diphosphite, CAS number 3806-34-6.

[0045] The auxiliary agent is vinyltriethoxysilane, CAS number 78-08-0.

[0046] Example 2

[0047] A removable glue, the preparation raw materials include rubber 80 parts, resin 30 parts, softening agent 10 parts, auxiliary agent 1.5 parts, antioxidant 1.2 parts, the resin is tackifying resin.

[0048] A preparation method of a removable glue, comprising the following steps:

[0049] S1. Add resin, softening agent, auxiliary agent to the stirring device, stir and heat to 120℃ to get mixture a;

[0050] S2. Add antioxidant, rubber to the mixture a, mix and heat to 185℃, and get removable glue after vacuumizing.

[0051] The rubber is styrene-isoprene-styrene (block copolymer and styrene-butadiene-styrene block copolymer composition, the weight ratio is 1:0.5.

[0052] The styrene-isoprene-styrene block copolymer is purchased from Balin Petrochemical, model YH-1106.

[0053] The purchase manufacturer of the styrene-butadiene-styrene block copolymer is Balin Petrochemical, and the model is YH792.

[0054] The tackifying resin is C5 petroleum resin.

[0055] The purchase manufacturer of the C5 petroleum resin is Eastman.

[0056] The softening agent is microcrystalline wax.

[0057] The purchase manufacturer of the microcrystalline wax is Shandong Jinghao Chemical Co., Ltd., and the model is 56#.

[0058] The antioxidant is distearyl pentaerythritol diphosphite, and the CAS number is 3806-34-6.

[0059] The auxiliary agent is vinyltriethoxysilane, and the CAS number is 78-08-0.

[0060] Example 3

[0061] A removable adhesive, the preparation raw materials comprising rubber 100 parts, resin 50 parts, softening agent 20 parts, auxiliary agent 3 parts, antioxidant 2 parts, and the resin is a tackifying resin.

[0062] A preparation method of a removable adhesive, comprising the following steps:

[0063] S1. The resin, softening agent, and auxiliary agent are added to a stirring device for stirring and heating to 120°C to obtain a mixture a;

[0064] S2. The antioxidant, rubber are added to the mixture a for mixing and heating to 185°C, and a removable adhesive is obtained after vacuumizing.

[0065] The rubber is a combination of styrene-isoprene-styrene (block copolymer and styrene-butadiene-styrene block copolymer, and the weight ratio is 1:1.

[0066] The purchase manufacturer of the styrene-isoprene-styrene block copolymer is Balin Petrochemical, and the model is YH-1106.

[0067] The purchase manufacturer of the styrene-butadiene-styrene block copolymer is Balin Petrochemical, and the model is YH792.

[0068] The tackifying resin is C5 petroleum resin.

[0069] The purchase manufacturer of the C5 petroleum resin is Eastman.

[0070] The softening agent is microcrystalline wax.

[0071] The microcrystalline wax is purchased from Shandong Jinghao Chemical Co., Ltd., and the model is 56#.

[0072] The antioxidant is distearyl pentaerythritol diphosphite, and the CAS number is 3806-34-6.

[0073] The auxiliary agent is vinyltriethoxysilane, and the CAS number is 78-08-0.

[0074] Example 4

[0075] Example 4 provides a removable adhesive, which is different from Example 1 in that no auxiliary agent is used in Example 4, and the addition amount of the softening agent is 5 parts.

[0076] Performance test

[0077] Sample preparation: the removable adhesive prepared in Examples 1-4 is coated on a matte white glassine paper with a specification of 80 g / m2 and a size of 100 mm*60 mm, and the coating thickness is 50 um.

[0078] 1. Ring tack

[0079] The prepared sample is tested for removable ring tack according to GB / T31125-2014, and the test results are shown in Table 1.

[0080] 2. Peel strength

[0081] The prepared sample is tested for 20-minute 180-degree peel strength according to GB / T2792-2014, and the test results are shown in Table 1.

[0082] 3. Adhesion residue

[0083] The prepared sample is attached to the surface of a PET sheet, and is placed at room temperature for 20 min, then is placed in an oven at 60℃ for 48 h, and is taken out, and is placed at room temperature for 2 h, and is peeled off from the PET sheet at an angle of about 120° and a speed of 30 mm / s, and whether there is residual glue and degumming phenomenon is observed, and the test results are shown in Table 1.

[0084] Table 1

[0085]

[0086]

Claims

1. A removable adhesive, characterized in that, By weight, the raw materials for preparation consist of 80-100 parts of rubber, 30-50 parts of resin, 10-20 parts of softener, and 1-3 parts of additives, wherein the resin is a tackifying resin. The rubber is a composition of styrene-isoprene-styrene block copolymer and styrene-butadiene-styrene block copolymer in a weight ratio of 1:(0.5-1). The softening point of the tackifying resin is 100-120°C; The softener is microcrystalline wax; The additive is vinyltriethoxysilane.

2. The removable adhesive as described in claim 1, characterized in that, The styrene-butadiene-styrene block copolymer contains 10-30% styrene.

3. The removable adhesive as described in claim 1, characterized in that, The tackifying resin is selected from one or more of petroleum resin, rosin resin, and terpene resin.

4. The removable adhesive as described in claim 3, characterized in that, The petroleum resin is selected from C5 petroleum resin or C9 petroleum resin.

5. A method for preparing a removable adhesive as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Add resin, softener, and additives to a stirring device, stir, and heat to 110-130℃ to obtain mixture a; S2. Add the rubber to mixture a, mix and heat to 170-190℃, then vacuum to obtain a removable adhesive.

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