A kind of special adhesive for low temperature wall stickers and preparation method thereof

Abstract

The present invention relates to the field of adhesive technology, in particular to the field of IPC C09J7, and more specifically to a special adhesive for low-temperature wall stickers and a preparation method thereof. The special adhesive for low-temperature wall stickers, by weight, comprises raw materials for preparing: 30-35 parts of block copolymers, 35-45 parts of tackifiers, 25-35 parts of softeners, 0.2-1 parts of auxiliary agents, and 0.2-1 parts of free radical scavengers. The present invention significantly improves the low-temperature initial viscosity of the adhesive by adopting a formula in which a block copolymer with a high diblock content and a relatively high styrene content, a petroleum resin and a rosin resin are used in combination, and ensures that the adhesive also has a high degree of conformity and wettability at a relatively low temperature. The adhesive prepared by the present application is suitable for use in the fields of construction, decoration, automobiles, shoemaking, packaging, etc., and is particularly suitable for decorative wall stickers that fit various wall surfaces under low temperature environments.

Description

Technical Field

[0001] The present invention relates to the field of adhesive technology, in particular to the field of IPC C09J7, and more specifically to a special adhesive for low-temperature wall stickers and a preparation method thereof. Background Art

[0002] Three-dimensional wall stickers are a new type of indoor and outdoor three-dimensional wall decorative panels that have emerged in recent years. They have the characteristics of fashionable and simple shape, real three-dimensional effect, fast assembly speed, more flexible decorative design, better decorative art effect, etc. Wall stickers are ready-made self-adhesive stickers that have been designed and produced and only need to be pasted by hand.

[0003] Generally, wall stickers are required to have good adhesion, removability, environmental protection, and wear resistance. Hot melt adhesive is an adhesive made by melting and mixing thermoplastic resin or elastomer as the base material, adding tackifiers, plasticizers, antioxidants, etc. It has been widely used in the fields of construction, aircraft, ships, and automobile interior decoration. It has the advantages of simple operation, environmental protection, and low odor when used for wall stickers. At present, it is necessary to develop hot melt pressure-sensitive adhesives for wall stickers used in winter environments.

[0004] However, at present, polymers generally only use styrene block copolymers, and the resin is solid petroleum resin. Products with high TG points and weak polarity are not suitable for use in sub-zero environments in winter; and most of the existing wall stickers are PE foam, PVC foam, etc. Different substrates have higher requirements for the anti-plasticization and wettability of the coated hot melt adhesive; more and more types of walls using such products are now required to have higher requirements for the applicability of the coated adhesive film in low temperature environments in winter, and the requirements for sustained adhesion are also very high.

[0005] In the prior art, a patent application document with application publication number CN112322196A discloses an adhesive for rapid bonding of polystyrene foam materials and a preparation method thereof. By controlling the dosage ratio of a curing accelerator and a free radical inhibitor, the adhesive can not only rapidly bond polystyrene foam materials but also has a longer shelf life. However, the low-temperature bonding performance of the adhesive is not greatly improved.

[0006] The patent application document with authorization announcement number CN103409099B discloses a low-temperature, low-viscosity formula polyurethane hot melt adhesive and its production process. The prepared hot melt adhesive has high bonding strength, but the improvement of the low-temperature bonding performance of the adhesive is not obvious. Summary of the invention

[0007] In order to solve the above problems, the first aspect of the present invention provides a special adhesive for low-temperature wall stickers. The raw materials for preparation include, by weight: 30-35 parts of block copolymer, 35-45 parts of tackifier, 25-35 parts of softener, 0.2-1 part of auxiliary agent, and 0.2-1 part of free radical scavenger.

[0008] Preferably, the block copolymer is selected from one or more of SIS block copolymer, styrene-butadiene block copolymer, SBS block copolymer, styrene-butadiene-3-chloropropylene block copolymer, and SSBR; further preferably, it is SIS block copolymer (styrene-isoprene-styrene block copolymer) and SSBR (solution polymerized styrene-butadiene rubber).

[0009] Preferably, the weight ratio of the SIS block copolymer to the SSBR is (2-4):(3-4).

[0010] Preferably, the SI content of the two blocks in the SIS block copolymer is 30-70wt%, and the styrene content is 15-25wt%; further preferably, the SI content of the two blocks in the SIS block copolymer is 50wt%, and the styrene content is 16wt%.

[0011] In some preferred embodiments, the SIS block copolymer is purchased from a supplier, Hunan Yuehua Chemical Industry Co., Ltd., and is produced as YH 1126.

[0012] Preferably, the raw rubber Mooney viscosity ML100℃1+4 of the SSBR at 100℃ is 35-60, and the styrene content is 20-30wt%; further preferably, the raw rubber Mooney viscosity ML100℃1+4 of the SSBR at 100℃ is 40-55, and the styrene content is 25wt%.

[0013] In some preferred embodiments, the SBS block copolymer is purchased from a supplier, Hunan Yuehua Chemical Industry Co., Ltd., and is produced as SSBR 2605.

[0014] The present application selects specific SIS block copolymers and SSBR as block copolymers, and when the weight ratio of the SIS block copolymers to SSBR is (2-4): (3-4), the bonding strength of the adhesive can be greatly improved, especially the initial adhesion and peel strength at low temperatures. This may be due to a certain synergistic effect between the two specific block copolymers with high diblock content and relatively high styrene content, which greatly improves the bonding strength of the adhesive. The higher bonding strength enables it to be applied to foaming surface materials such as PE foam and PVC foam. However, the block copolymer itself does not have viscosity, so other ingredients must be added to increase the fluidity of the adhesive and its adhesion to the foaming surface material.

[0015] Preferably, the tackifier is one or more of C9 petroleum resin, rosin resin, C5 petroleum resin, DCPD petroleum resin, C5 hydrogenated petroleum resin, C9 hydrogenated petroleum resin, terpene resin, and liquid petroleum resin; further preferably, it is rosin resin, DCPD petroleum resin (dicyclopentadiene petroleum resin), C5 petroleum resin (aliphatic petroleum resin) and liquid petroleum resin.

[0016] Preferably, the weight ratio of the rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin is (5-8):(5-8):(20-25):(5-8).

[0017] Preferably, the softening point of the rosin resin is 95-115°C; more preferably, it is 100°C.

[0018] In some preferred embodiments, the rosin resin is purchased from a supplier, Jiangxi Huajin New Materials Co., Ltd., and is a rosin modified resin 145#.

[0019] Preferably, the softening point of the DCPD resin is 95-120° C., and the bromine value is 120-200 gBr / 100 g; further preferably, the softening point of the DCPD resin is 110° C., and the bromine value is 160 gBr / 100 g.

[0020] In some preferred embodiments, the DCPD resin is purchased from Ruisen Petroleum Resins Co., Ltd. -D1110.

[0021] Preferably, the softening point of the C5 petroleum resin is 90-110°C, and the insoluble matter in benzene is ≤0.1wt%; further preferably, the softening point of the C5 petroleum resin is 96-104°C, and the insoluble matter in benzene is ≤0.05wt%.

[0022] In some preferred embodiments, the C5 petroleum resin is purchased from a supplier, Henghe Materials Technology Co., Ltd., and is C5 petroleum resin YH-1288.

[0023] Preferably, the melt viscosity of the liquid petroleum resin at 200°C is ≤300cp, and the softening point is 95-105°C; further preferably, the melt viscosity of the liquid petroleum resin at 200°C is ≤250cp, and the softening point is 100°C.

[0024] In some preferred embodiments, the liquid petroleum resin is purchased from Ruisen Petroleum Resin Co., Ltd. -5101.

[0025] The applicant unexpectedly discovered that the use of rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin in a weight ratio of (5-8): (5-8): (20-25): (5-8) as tackifiers can improve the bonding strength of the adhesive while also improving the processing performance of the adhesive. This may be due to the good compatibility between the specific tackifier and the block copolymer in the present application, which can improve the wettability of the adhesive to the foam surface material, allowing the two to fully contact and thereby improve the peel strength, and can also reduce the melt viscosity of the adhesive, thereby improving the high-temperature fluidity of the product, and further improving the processing performance of the adhesive. At the same time, the softening point of the adhesive can also be appropriately adjusted so that there is no risk of viscosity reduction in a high-temperature environment.

[0026] Preferably, the softener is one or more of engine oil, white oil, low molecular weight polybutadiene, and cyclohexane oil; more preferably, it is cyclohexane oil.

[0027] Preferably, the kinematic viscosity of the naphthenic oil at 100°C is 5-15 mm 2 / s; further preferably, 10.06mm 2 / s.

[0028] In some preferred embodiments, the cyclohexane oil is purchased from cyclohexane oil 4010 produced by Xinjiang Karamay Company.

[0029] Preferably, the auxiliary agent includes an anti-ultraviolet agent, an anti-yellowing agent, and a maleic acid glycoside modified resin.

[0030] Preferably, the weight ratio of the ultraviolet absorber, the anti-yellowing agent and the maleic acid glycoside modified resin is (1-2): (1-2): (1-2).

[0031] Preferably, the ultraviolet absorber is one or more of a salicylate ultraviolet absorber, a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, and a triazine ultraviolet absorber; more preferably, it is a benzotriazole ultraviolet absorber.

[0032] Preferably, the main component of the benzotriazole ultraviolet absorber is one or more of 2-(2'-hydroxy-3', 5'-di-tert-phenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3', 5'-di-tert-amylphenyl)benzotriazole, 2-(2ˊ-hydroxy-5ˊ-methylphenyl)benzotriazole, and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole; further preferably, it is 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

[0033] In some preferred embodiments, the benzotriazole UV absorber is purchased from a supplier, Tianjin Lianlong New Materials Co., Ltd., which produces a light stabilizer. UV-326.

[0034] Preferably, the purity of the anti-yellowing agent is >95%; further preferably, the purity of the anti-yellowing agent is >99%.

[0035] In some preferred embodiments, the anti-yellowing agent is purchased from the anti-yellowing agent Fisorb B5435 produced by Dongguan Kaiyue Chemical Technology Co., Ltd.

[0036] Preferably, the softening point of the maleic acid glycoside modified resin is 120-150°C, and the acid value is ≤30 mgKOH / g; further preferably, the softening point of the maleic acid glycoside modified resin is 130-145°C, and the acid value is ≤25 mgKOH / g.

[0037] In some preferred embodiments, the maleic acid glycoside modified resin is purchased from maleic acid modified rosin resin 4130 produced by Shaoguan Derui Chemical Industry Co., Ltd.

[0038] In some preferred schemes, a specific maleic acid glycoside modified resin is selected as an auxiliary agent, which has good compatibility with the raw materials between the systems and can also enable the adhesive to maintain viscosity in a low-humidity environment.

[0039] Preferably, the main component of the free radical scavenger is one or more of 1,3,5-trimethyl, 2,4,6,-tris(3,5,-di-tert-butyl, 4-hydroxybenzyl)benzene, 1,3,5-trimethyl, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; further preferably, it is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0040] In some preferred embodiments, the free radical scavenger is purchased from a supplier, Irganox 1010 produced by BASF Corporation of the United States.

[0041] The second aspect of the present application provides a method for preparing the special adhesive for low-temperature wall stickers, comprising the following steps:

[0042] S1. After mixing the softener and the block polymer, heat to 120-130°C and stir to completely dissolve the block polymer;

[0043] S2, adding a tackifier to the substance obtained in step S1, heating to 135-140° C. and mixing with a spiral shearing machine;

[0044] S3. Add an auxiliary agent and a free radical scavenger to the substance obtained in step S2, and stir evenly at 155-180° C. to obtain a special adhesive for low-temperature wall stickers.

[0045] Beneficial effects:

[0046] 1. By selecting specific SIS block copolymers and SSBR as block copolymers, and when the weight ratio of the SIS block copolymers to the SSBR is (2-4):(3-4), the bonding strength of the adhesive can be greatly improved, especially the initial adhesion and peel strength at low temperatures.

[0047] 2. By selecting rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin in a weight ratio of (5-8): (5-8): (20-25): (5-8) as tackifiers, the bonding strength of the adhesive can be improved while also improving the processing performance of the adhesive.

[0048] 3. By selecting a specific maleic acid glycoside modified resin as an auxiliary agent, it not only has good compatibility with the raw materials between the systems, but also can make the adhesive maintain viscosity in a low humidity environment.

[0049] 4. The present invention significantly improves the low-temperature initial viscosity of the adhesive by adopting a formula of block copolymers with high diblock content and relatively high styrene content, petroleum resin and rosin resin, and ensures that the adhesive has high docility and wettability at lower temperatures. The adhesive prepared by the formula and process of this application will not only not affect the production process, but also reduce the melt viscosity of the adhesive, thereby improving the high-temperature fluidity of the product, and then improving the coating efficiency during coating and the bonding force between the film and the substrate, so that the adhesive prepared by this application can be applied in construction under low-temperature conditions in the north; at the same time, the softening point of the product is not significantly reduced, thereby reducing the risk of loss of adhesion caused by excessive penetration of the film into the substrate during storage, especially in hot summer temperatures. The adhesive prepared by this application is suitable for use in the fields of construction, decoration, automobiles, shoemaking, packaging, etc., and is particularly suitable for decorative wall stickers that fit various walls under low-temperature environments. DETAILED DESCRIPTION

[0050] Example

[0051] Example 1

[0052] Example 1 provides a special adhesive for low-temperature wall stickers. The raw materials for preparation include, by weight: 33 parts of block copolymer, 40 parts of tackifier, 30 parts of softener, 0.5 parts of auxiliary agent, and 0.5 parts of free radical scavenger.

[0053] The block copolymers are SIS block copolymers and SSBR.

[0054] The weight ratio of the SIS block copolymer to the SSBR is 6:7.

[0055] The content of the two-block SI in the SIS block copolymer is 50 wt %, and the content of styrene is 16 wt %.

[0056] The SIS block copolymer was purchased from a supplier, Hunan Yuehua Chemical Industry Co., Ltd., and produced YH 1126.

[0057] The raw rubber Mooney viscosity ML100°C 1+4 of the SSBR at 100°C is 40-55, and the styrene content is 25wt%.

[0058] The SBS block copolymer was purchased from a supplier, Hunan Yuehua Chemical Industry Co., Ltd., producing SSBR 2605.

[0059] The tackifier is rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin.

[0060] The weight ratio of the rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin is 1:1:4:1.

[0061] The softening point of the rosin resin is 100°C.

[0062] The rosin resin was purchased from a supplier, Jiangxi Huajin New Materials Co., Ltd., and the product was rosin modified resin 145#.

[0063] The DCPD resin has a softening point of 110° C. and a bromine value of 160 gBr / 100 g.

[0064] The DCPD resin was purchased from Ruisen Petroleum Resin Co., Ltd. -D1110.

[0065] The softening point of the C5 petroleum resin is 96-104° C., and the insoluble matter in benzene is ≤0.05wt%.

[0066] The C5 petroleum resin was purchased from a supplier, Henghe Materials Technology Co., Ltd., and was produced as C5 petroleum resin YH-1288.

[0067] The liquid petroleum resin has a melting viscosity of ≤250 cp at 200°C and a softening point of 100°C.

[0068] The liquid petroleum resin was purchased from Ruisen Petroleum Resin Co., Ltd. -5101.

[0069] The softener is naphthenic oil.

[0070] The kinematic viscosity of the naphthenic oil at 100°C is 10.06 mm 2 / s.

[0071] The cyclopentane oil was purchased from cyclopentane oil 4010 produced by Xinjiang Karamay Company.

[0072] The auxiliary agents include anti-ultraviolet agent, anti-yellowing agent and maleic acid glycoside modified resin.

[0073] The weight ratio of the ultraviolet absorber, the anti-yellowing agent and the maleic acid glycoside modified resin is 1:1:1.

[0074] The ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0075] The main component of the benzotriazole ultraviolet absorber is 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

[0076] The benzotriazole ultraviolet absorber was purchased from the light stabilizer produced by Tianjin Lianlong New Materials Co., Ltd. UV-326.

[0077] The purity of the anti-yellowing agent is greater than 99%.

[0078] The anti-yellowing agent was purchased from the anti-yellowing agent Fisorb B5435 produced by Dongguan Kaiyue Chemical Technology Co., Ltd.

[0079] The softening point of the maleic acid glycoside modified resin is 130-145° C., and the acid value is ≤25 mgKOH / g.

[0080] The maleic acid glycoside modified resin was purchased from maleic acid modified rosin resin 4130 produced by Shaoguan Derui Chemical Industry Co., Ltd.

[0081] The main component of the free radical scavenger is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0082] The free radical scavenger was purchased from a supplier, Irganox 1010 produced by BASF Corporation of the United States.

[0083] The second aspect of the present application provides a method for preparing the special adhesive for low-temperature wall stickers, comprising the following steps:

[0084] S1. After mixing the softener and the block polymer, heat to 125°C and stir to completely dissolve the block polymer;

[0085] S2, adding a tackifier to the substance obtained in step S1, heating to 138° C. and mixing with a spiral shearing machine;

[0086] S3. Add an auxiliary agent and a free radical scavenger to the substance obtained in step S2, and stir evenly at 170° C. to obtain a special adhesive for low-temperature wall stickers.

[0087] Example 2

[0088] Example 2 provides a special adhesive for low-temperature wall stickers. The specific implementation method is the same as Example 1, except that: 30 parts of block copolymer, 35 parts of tackifier, 25 parts of softener, 0.2 parts of auxiliary agent, and 0.2 parts of free radical scavenger.

[0089] The weight ratio of the SIS block copolymer to the SSBR is 1:2.

[0090] The weight ratio of the rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin is 5:5:20:5.

[0091] The weight ratio of the ultraviolet absorber, the anti-yellowing agent and the maleic acid glycoside modified resin is 1:1:2.

[0092] The second aspect of the present application provides a method for preparing the special adhesive for low-temperature wall stickers, comprising the following steps:

[0093] S1. After mixing the softener and the block polymer, heat to 120°C and stir to completely dissolve the block polymer;

[0094] S2, adding a tackifier to the substance obtained in step S1, heating to 135° C. and mixing with a spiral shearing machine;

[0095] S3. Add an auxiliary agent and a free radical scavenger to the substance obtained in step S2, and stir evenly at 155° C. to obtain a special adhesive for low-temperature wall stickers.

[0096] Example 3

[0097] Example 3 provides a special adhesive for low-temperature wall stickers. The specific implementation method is the same as Example 1, except that: 35 parts of block copolymer, 45 parts of tackifier, 35 parts of softener, 1 part of auxiliary agent, and 1 part of free radical scavenger.

[0098] The weight ratio of the SIS block copolymer to the SSBR is 4:3.

[0099] The weight ratio of the rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin is 8:8:25:8.

[0100] The weight ratio of the ultraviolet absorber, the anti-yellowing agent and the maleic acid glycoside modified resin is 2:2:1.

[0101] The second aspect of the present application provides a method for preparing the special adhesive for low-temperature wall stickers, comprising the following steps:

[0102] S1. After mixing the softener and the block polymer, heat to 130°C and stir to completely dissolve the block polymer;

[0103] S2, adding a tackifier to the substance obtained in step S1, heating to 140° C. and mixing with a spiral shearing machine;

[0104] S3. Add an auxiliary agent and a free radical scavenger to the substance obtained in step S2, and stir evenly at 180° C. to obtain a special adhesive for low-temperature wall stickers.

[0105] Comparative Example 1

[0106] Comparative Example 1 provides a special adhesive for low-temperature wall stickers. The specific implementation method is the same as that of Example 1, except that the weight ratio of the SIS block copolymer to SSBR is 2:1.

[0107] Comparative Example 2

[0108] Comparative Example 2 provides a special adhesive for low-temperature wall stickers. The specific implementation method is the same as that of Example 1, except that the weight ratio of the rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin is 1:1:1:1.

[0109] Comparative Example 3

[0110] Comparative Example 3 provides a special adhesive for low-temperature wall stickers. The specific implementation method is the same as that of Example 1, except that the auxiliary agent includes an anti-ultraviolet agent and an anti-yellowing agent.

[0111] The weight ratio of the ultraviolet absorber to the anti-yellowing agent is 1:1.

[0112] Performance Testing Methods

[0113] 1. Melt viscosity

[0114] The melt viscosity of the special adhesive for low-temperature wall stickers prepared in Examples 1-3 and Comparative Examples 1-3 was tested with reference to HG / T 3658-3660-1999, and the results are recorded in Table 1.

[0115] 2. Softening point

[0116] The softening points of the special adhesives for low-temperature wall stickers prepared in Examples 1-3 and Comparative Examples 1-3 were tested by the ring and ball method, and the results are recorded in Table 1.

[0117] 3. Glass transition temperature (T g )

[0118] The glass transition temperatures of the special adhesives for low-temperature wall stickers prepared in Examples 1-3 and Comparative Examples 1-3 were tested with reference to GB / T 29611-2013, and the results are recorded in Table 1.

[0119] 4. Peel force

[0120] For the low-temperature wall sticker adhesive prepared in Examples 1-3 and Comparative Examples 1-3, 30 gsm of the adhesive was coated on the foam surface material, and the ring initial adhesion and peeling force at -5°C were tested according to GB / T 31125-2014 and GB / T2792-2014. The results are recorded in Table 1.

[0121] 5. Low temperature actual mounting test

[0122] For the special adhesive for low-temperature wall stickers prepared in Examples 1-3 and Comparative Examples 1-3, 30 gsm of adhesive was applied on the foam surface material, and the foam surface material coated with the adhesive was pasted on the wall in an environment of -30°C, and the foam surface material was removed after staying for 0 min, 60 min, and 12 h, respectively, and the condition of the foam surface material was observed. If the foam surface material can be removed, it is determined as Level 1, if the damage area is ≤25%, it is determined as Level 2, if the damage area is greater than 25% and ≤50%, it is determined as Level 3, if the damage area is greater than 50% and ≤75%, it is determined as Level 4, and if the damage area is greater than 75%, it is determined as Level 5. The results are recorded in Table 1.

[0123] Table 1

[0124]

[0125]

Claims

1. A special adhesive for low-temperature wall stickers, characterized in that: The raw materials for its preparation include, by weight: 30-35 parts of block copolymer, 35-45 parts of tackifier, 25-35 parts of softener, 0.2-1 parts of auxiliary agent and 0.2-1 parts of free radical scavenger; the block copolymer is SIS block copolymer and SSBR, the raw rubber Mooney viscosity ML100℃1+4 of the SSBR at 100℃ is 35-60, and the styrene content is 20-30wt%; the content of two blocks SI in the SIS block copolymer is 30-70wt%, and the content of styrene is 15-25wt%; the weight ratio of the SIS block copolymer to the SSBR is (2-4):(3-4); the tackifier is rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin, the softening point of the rosin resin is 95-115℃, and the DCPD resin has a The softening point is 95-120°C, the bromine value is 120-200gBr / 100g, the softening point of the C5 petroleum resin is 90-110°C, the insoluble matter in benzene is ≤0.1wt%, the melt viscosity of the liquid petroleum resin at 200°C is ≤300cp, and the softening point is 95-105°C. The weight ratio of the rosin resin, DCPD petroleum resin, C5 petroleum resin and liquid petroleum resin is (5-8): (5-8): (20-25): (5-8); the auxiliary agent includes an ultraviolet absorber, an anti-yellowing agent, and a maleic acid glycoside modified resin; the weight ratio of the ultraviolet absorber, the anti-yellowing agent, and the maleic acid glycoside modified resin is (1-2): (1-2): (1-2); the maleic acid glycoside modified resin is purchased from maleic acid modified rosin resin 4130 produced by Shaoguan Derui Chemical Industry Co., Ltd.

2. A method for preparing a special adhesive for low-temperature wall stickers according to claim 1, comprising the following steps: S1. After mixing the softener and the block polymer, heat to 120-130°C and stir to completely dissolve the block polymer; S2, adding a tackifier to the substance obtained in step S1, heating to 135-140° C. and mixing with a spiral shearing machine; S3. Add an auxiliary agent and a free radical scavenger to the substance obtained in step S2, and stir evenly at 155-180° C. to obtain a special adhesive for low-temperature wall stickers.

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