Hot-melt pressure-sensitive adhesive for cotton packaging adhesive tape and preparation method of hot-melt pressure-sensitive adhesive

Abstract

The invention relates to the technical field of hot-melt pressure-sensitive adhesives, in particular to the field of IPC C09J153, and more particularly relates to a hot-melt pressure-sensitive adhesive for a cotton packaging adhesive tape and a preparation method of the hot-melt pressure-sensitive adhesive. The invention relates to a thermoplastic elastomer composition which comprises the following components in percentage by weight: 10-30% of thermoplastic elastomer, 10-30% of rubber, 10-30% of rubber filling oil, 1-7% of monomer resin, 0.1-2% of auxiliaries and the balance of petroleum resin. The pressure-sensitive adhesive prepared by the invention has the properties of ultraviolet resistance, high and low temperature resistance, aging resistance, frost resistance, high viscosity and the like, and further meets the use requirements of the cotton packaging adhesive tape.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt pressure sensitive adhesives, in particular to the field of IPC C09J153, and more specifically to a hot melt pressure sensitive adhesive for cotton packing tape and a preparation method thereof. Background Art

[0002] Cotton is the field cash crop with the longest industrial chain in China's planting production, and its commodity rate is as high as over 95%. A large amount of cotton picking has gradually been replaced by machinery, and the cotton harvested by the cotton picker needs to be promptly packaged with baling film. Cotton baling tape is a packaging material specially used in the cotton baling process. It is designed to pack, seal and protect cotton after it is harvested for easy storage and transportation. my country's cotton production base is mainly in Xinjiang. According to the climate conditions in Xinjiang, the adhesive used for this tape must have: strong adhesion, even under the pressure of a certain weight of cotton bales, it can maintain the stability and integrity of the baling structure to prevent the baling from loosening or breaking. Secondly, it has excellent weather resistance, can resist various adverse weather conditions such as ultraviolet rays, high temperature, low temperature, humidity, etc., prevent cotton from being damaged by the external environment, and maintain the quality of cotton.

[0003] Chinese invention patent CN 202010427336 discloses a hot-melt pressure-sensitive adhesive for low-temperature waterproof roll-to-roll tape and a preparation method thereof. By using a polyisobutylene compound as a plasticizer, it can rely on its own polar group to enter the SIS thermoplastic elastomer when heated, hindering the mutual attraction of the elastomer polymer molecules, making the polymer easily plasticized, and finally preparing a product with high peel strength. However, the invention did not explore the weather resistance of the hot-melt adhesive and is not suitable for cotton packing tape. Summary of the invention

[0004] The first aspect of the present invention provides a hot melt pressure-sensitive adhesive for cotton packing tape, which comprises, by weight percentage, 10-30% of thermoplastic elastomer, 10-30% of rubber, 10-30% of rubber filler oil, 1-7% of monomer resin, 0.1-2% of additive, and the balance made up of petroleum resin.

[0005] The rubber includes butyl rubber and polyisobutylene, and the weight ratio of the butyl rubber to the polyisobutylene is (1-3):1.

[0006] The applicant has found that the rubber includes butyl rubber and polyisobutylene, and the weight ratio of the butyl rubber to the polyisobutylene is (1-3): 1. The initial adhesion and sustained adhesion of the pressure-sensitive adhesive can be improved, which may be due to the improvement of the microphase region existing in the mixing process of the thermoplastic elastomer, which can effectively improve the wettability between the three phases, and further may be due to the improvement of the wax mist point of the petroleum resin, thereby improving the compatibility of the petroleum resin with the polar molecules in the hot melt pressure-sensitive adhesive and improving the cohesive performance of the hot melt pressure-sensitive adhesive. The phenomenon of defects in the network structure of the polymer continuous phase, which leads to a decrease in cohesive strength, is avoided.

[0007] Preferably, the weight ratio of the butyl rubber to polyisobutylene is (1-2):1.

[0008] The molecular weight of the polyisobutylene is 800-2000.

[0009] Preferably, the molecular weight of the polyisobutylene is 900-1300.

[0010] Further preferably, the polyisobutylene includes at least one of PB950 (Dalin), PB1300 (Dalin), and H100 (Ineos).

[0011] Preferably, the Mooney viscosity of the butyl rubber is 40-60 at 125°C.

[0012] The monomer resin has a softening point of 120-150° C. and a number average molecular weight of 1000-3000.

[0013] Preferably, the monomer resin has a softening point of 130-150° C. and a number average molecular weight of 1000-2000.

[0014] The thermoplastic elastomer comprises SEBS (hydrogenated styrene-butadiene block copolymer), the styrene content of the SEBS is 25-32 wt %, and the melt flow rate (200° C., 5 kg) is 0.1-1 g / 10 min.

[0015] Preferably, the SEBS has a styrene content of 28-32 wt % and a melt flow rate (200° C., 5 kg) of 0.1-0.5 g / 10 min.

[0016] The weight ratio of the thermoplastic elastomer to the rubber is 1:(1-2.5).

[0017] Preferably, the weight ratio of the thermoplastic elastomer to the rubber is 1:(1-1.5).

[0018] The auxiliary agents include antioxidants and ultraviolet absorbers.

[0019] The antioxidant includes a hindered phenol antioxidant.

[0020] Preferably, the hindered phenol antioxidant includes at least one of antioxidant 1010, antioxidant 1076, antioxidant 1024, and antioxidant 1098.

[0021] The ultraviolet absorbers include Lianlong UV-326 and Lianlong UV-770.

[0022] Preferably, the weight ratio of the Lianlong UV-326 to the Lianlong UV-770 is 1:(2-5).

[0023] Further preferably, the weight ratio of the Lianlong UV-326 to the Lianlong UV-770 is 1:(2-3).

[0024] The petroleum resin includes one or more of hydrogenated C5, non-hydrogenated C5, DCPD (dicyclopentadiene), hydrogenated C9, and C5 / C9 copolymer.

[0025] The rubber filling oil includes one or more of paraffin oil, naphthenic oil and white mineral oil.

[0026] A second aspect of the present invention provides a method for preparing a hot-melt pressure-sensitive adhesive for cotton packing tape, comprising the following steps:

[0027] S1, uniformly mixing butyl rubber and rubber filler oil accounting for 40-90wt% of the total amount to obtain premixed butyl rubber;

[0028] S2, preheating the remaining rubber filling oil, adding a thermoplastic elastomer and an antioxidant, heating until the thermoplastic elastomer is melted, and adding a petroleum resin to obtain a first mixture;

[0029] S3, adding the premixed butyl rubber to the first mixture, stirring evenly, and then adding polyisobutylene, stirring evenly to obtain a second mixture;

[0030] S4, adding the monomer resin and the ultraviolet absorber into the second mixture, and stirring evenly to obtain.

[0031] The content of butyl rubber in the premixed butyl rubber is 40-60wt%.

[0032] Preferably, the content of butyl rubber in the premixed butyl rubber is 45-60wt%.

[0033] Beneficial Effects

[0034] 1. The rubber comprises butyl rubber and polyisobutylene, and the weight ratio of butyl rubber to polyisobutylene is (1-3):

[0035] 1. It can improve the initial adhesion and lasting adhesion of pressure-sensitive adhesive.

[0036] 2. The weight ratio of thermoplastic elastomer to rubber is 1:(1-2.5), which can improve the 180° peel strength.

[0037] 3. The content of butyl rubber in the premixed butyl rubber is 40-60wt%, which can improve the preparation efficiency of the pressure-sensitive adhesive.

[0038] 4. The UV absorber includes Rianlon UV-326 and Rianlon UV-770, and the weight ratio of Rianlon UV-326 to Rianlon UV-770 is 1:(2-5), which can achieve excellent

[0039] It has excellent UV aging resistance and storage stability, thus meeting the use requirements of cotton packing tape.

[0040] 5. The present application adds a monomer resin having a softening point of 120-150°C and a number average molecular weight of 1000-3000, which can improve the high and low temperature resistance of the pressure-sensitive adhesive. DETAILED DESCRIPTION

[0041] Example 1

[0042] A hot melt pressure-sensitive adhesive for cotton packing tape comprises the following components by weight percentage: 18% of thermoplastic elastomer (YH-501 of Baling Petrochemical, SEBS rubber), 25% of rubber, 18% of rubber filler oil (naphthenic oil, PetroChina N4010), 3% of monomer resin (Eastman 5140), 1% of auxiliary agent, and the balance of petroleum resin (hydrogenated C9 resin, Henghe HF100).

[0043] The rubber is Russian BK-1675N butyl rubber and Korean Daelim PB1300 polyisobutylene, and the weight ratio of the butyl rubber to the polyisobutylene is 1:1.5.

[0044] The auxiliary agent is 0.2wt% of an antioxidant (antioxidant 1010) and 0.8wt% of an ultraviolet absorber, the ultraviolet absorber is Lianlong UV-326 and Lianlong UV-770, and the weight ratio of UV-326 to UV-770 is 1:2.5.

[0045] A method for preparing a hot-melt pressure-sensitive adhesive for cotton packing tape comprises the following steps:

[0046] 1. Set the internal mixing equipment to 150°C and pre-melt butyl rubber at a weight ratio of butyl rubber: naphthenic oil = 1:1;

[0047] 2. Preheat the remaining cyclohexane oil in an oil bath to 115°C and maintain for 10 minutes, during which the stirring speed is maintained at 25 r / min;

[0048] 3. Add SEBS and antioxidant, turn on the electric heating, heat to 120℃, evacuate to -0.1MPa, and stir for 35min until SEBS is completely melted;

[0049] 4. Turn off the vacuum, add hydrogenated C9 resin, and stir for 15 minutes;

[0050] 5. Add pre-melted butyl rubber and stir for 10 minutes;

[0051] 6. Add polyisobutylene and stir for 10 minutes;

[0052] 7. Add monomer resin and ultraviolet light absorber, evacuate to -0.1MPa and heat to 145℃, turn off the electric heating, increase the stirring speed to 45r / min and stir for 30min, then turn off the vacuum to discharge the glue.

[0053] Comparative Example 1

[0054] A hot melt pressure sensitive adhesive comprises the following components by weight percentage: 18% of thermoplastic elastomer (YH-1106 of Baling Petrochemical, SIS rubber), 15% of rubber (Russian BK-1675N butyl rubber), 18% of rubber filler oil (naphthenic oil, PetroChina N4010), 1% of auxiliary agent, and the balance of petroleum resin (hydrogenated DCPD resin).

[0055] The auxiliary agent is 0.2wt% of an antioxidant (antioxidant 1010) and 0.8wt% of an ultraviolet absorber, the ultraviolet absorber is Lianlong UV-326 and Lianlong UV-770, and the weight ratio of UV-326 to UV-770 is 1:2.5.

[0056] A method for preparing a hot melt pressure-sensitive adhesive comprises the following steps:

[0057] 1. Set the internal mixing equipment to 150°C and pre-melt butyl rubber at a weight ratio of butyl rubber to naphthenic oil = 1:1;

[0058] 2. Preheat the remaining cyclohexane oil in an oil bath to 115°C and maintain for 10 minutes, during which the stirring speed is maintained at 25 r / min;

[0059] 3. Add SIS and antioxidant, turn on the electric heating, heat to 120℃, evacuate to -0.1MPa, and stir for 35min until SIS is completely melted;

[0060] 4. Turn off the vacuum, add hydrogenated DCPD resin, and stir for 15 minutes;

[0061] 5. Add pre-melted butyl rubber and stir for 10 minutes;

[0062] 6. Add UV absorber, evacuate to -0.1MPa and heat to 145℃, turn off the electric heating, increase the stirring speed to 45r / min and stir for 30min, then turn off the vacuum to discharge the glue.

[0063] Comparative Example 2

[0064] A hot melt pressure sensitive adhesive comprises the following components by weight percentage: 18% of thermoplastic elastomer (YH-501 of Baling Petrochemical, SEBS rubber), 15% of rubber (Russian BK-1675N butyl rubber), 18% of rubber filler oil (naphthenic oil, PetroChina N4010), 1% of auxiliary agent, and the balance of petroleum resin (hydrogenated DCPD resin).

[0065] The auxiliary agent is 0.2wt% of an antioxidant (antioxidant 1010) and 0.8wt% of an ultraviolet absorber, the ultraviolet absorber is Lianlong UV-326 and Lianlong UV-770, and the weight ratio of UV-326 to UV-770 is 1:2.5.

[0066] A method for preparing a hot melt pressure-sensitive adhesive comprises the following steps:

[0067] 1. Set the internal mixing equipment to 150°C and pre-melt butyl rubber at a weight ratio of butyl rubber to naphthenic oil = 1:1;

[0068] 2. Preheat the remaining cyclohexane oil in an oil bath to 115°C and maintain for 10 minutes, during which the stirring speed is maintained at 25 r / min;

[0069] 3. Add SEBS and antioxidant, turn on the electric heating, heat to 120℃, evacuate to -0.1MPa, and stir for 35min until SEBS is completely melted;

[0070] 4. Turn off the vacuum, add hydrogenated DCPD resin, and stir for 15 minutes;

[0071] 5. Add pre-melted butyl rubber and stir for 10 minutes;

[0072] 6. Add UV absorber, evacuate to -0.1MPa and heat to 145℃, turn off the electric heating, increase the stirring speed to 45r / min and stir for 30min, then turn off the vacuum to discharge the glue.

[0073] Performance Testing Methods and Data

[0074] The performance of the hot melt pressure sensitive adhesives in the embodiments and comparative examples was tested, and the test data are listed in Table 1.

[0075] Table 1

[0076]

Claims

1. A hot melt pressure-sensitive adhesive for cotton packing tape, characterized in that: Calculated by weight percentage, the components include: 10-30% of thermoplastic elastomer, 10-30% of rubber, 10-30% of rubber filling oil, 1-7% of monomer resin, 0.1-2% of auxiliary agent, and petroleum resin making up the balance.

2. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 1, characterized in that: The rubber includes butyl rubber and polyisobutylene, and the weight ratio of the butyl rubber to the polyisobutylene is (1-3):

1.

3. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 2, characterized in that: The monomer resin has a softening point of 120-150° C. and a number average molecular weight of 1000-3000.

4. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 3, characterized in that: The thermoplastic elastomer comprises SEBS, the styrene content of the SEBS is 25-32wt%, and the melt flow rate is 0.1-1g / 10min at 200°C and 5kg.

5. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 4, characterized in that: The weight ratio of the thermoplastic elastomer to the rubber is 1:(1-2.5).

6. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 5, characterized in that: The auxiliary agents include antioxidants and ultraviolet absorbers.

7. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 6, characterized in that: The petroleum resin includes one or more of hydrogenated C5, non-hydrogenated C5, DCPD, hydrogenated C9, and C5 / C9 copolymer.

8. The hot melt pressure-sensitive adhesive for cotton packing tape according to claim 7, characterized in that: The rubber filling oil includes one or more of paraffin oil, naphthenic oil and white mineral oil.

9. A method for preparing the hot melt pressure sensitive adhesive for cotton packing tape according to any one of claims 6 to 8, characterized in that: The following steps are involved: S1, uniformly mixing butyl rubber and rubber filler oil accounting for 40-90wt% of the total amount to obtain premixed butyl rubber; S2, preheating the remaining rubber filling oil, adding a thermoplastic elastomer and an antioxidant, heating until the thermoplastic elastomer is melted, and adding a petroleum resin to obtain a first mixture; S3, adding the premixed butyl rubber to the first mixture, stirring evenly, and then adding polyisobutylene, stirring evenly to obtain a second mixture; S4, adding the monomer resin and the ultraviolet absorber into the second mixture, and stirring evenly to obtain.

10. The method for preparing the hot melt pressure sensitive adhesive for cotton packing tape according to claim 9, characterized in that: The content of butyl rubber in the premixed butyl rubber is 40-60wt%.

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