Preparation method and product of a waterproof label

Abstract

The present invention discloses a preparation method and product of a waterproof label, comprising the following steps: S1. Cutting a label paper roll; S2. Coating an adhesive for the label; S3. Setting a printing label template; S4. Performing multi-color and multi-plate printing; S5. Thermocompression laminating; S6. Die-cutting and winding to obtain a waterproof label. The prepared product has good adhesion performance and waterproof performance; moreover, the label also has a metallic texture, achieving the effect of distinct levels between the main scene and the background, and can be applied to medium and high-grade gift box labels.

Description

Technical Field

[0001] The present invention relates to the field of labels, and particularly to a preparation method and product of a waterproof label. Background Art

[0002] A waterproof label usually has a primary film on its surface. Through the function of the film, the functionality, stability, and appearance of the label can be ensured. Waterproof labels are widely used in barcode labels, commodity labels, shelf labels, pharmaceutical labels, etc. However, due to the complexity of the current usage environment, especially for label products used in humid environments, such as products like shampoo and body wash, which need to be frequently soaked by water, relying solely on the function of the film cannot well protect the label, and the adhesiveness and waterproofness at the joints also need to be considered.

[0003] Patent CN110176180A discloses a waterproof self-adhesive label, including a substrate. A waterproof film is provided on the label identification surface of the substrate. A sealing strip is provided at a certain distance from the edge of the waterproof film, and the sealing strip is in a square shape. The sealing strip is hot-pressed on the label identification surface of the substrate. The part of the waterproof film outside the sealing strip is adhered to the surface of the substrate, and a cavity is formed between the part of the waterproof film inside the sealing strip and the substrate. A flame-retardant gas is filled in the cavity. The substrate is coated with an adhesive layer on the adhesive surface. It uses the edge of the waterproof film and the glue to adhere to the label identification surface of the substrate, forms a cavity between the middle part of the waterproof film and the substrate, and is reinforced by the sealing strip, making it waterproof and flame-retardant at the same time. However, its preparation process is too complex and it is not suitable for applications in humid environments such as bathrooms.

[0004] Therefore, it is of great significance to prepare a waterproof label with better performance, especially one that can be applied to extremely humid environments such as bathrooms. Summary of the Invention

[0005] The present application provides a preparation method of a waterproof label, including the following steps:

[0006] S1. Cut the label paper roll;

[0007] S2. Coat the label glue;

[0008] S3. Set the printing label template;

[0009] S4. Perform multi-color and multi-plate printing;

[0010] S5. Hot-press and laminate;

[0011] S6. Die-cut and wind up to obtain the waterproof label.

[0012] As a preferred technical solution, the raw materials for preparing the label glue used in S2 include, by weight: 20-28 parts of thermoplastic elastomer, 20-30 parts of hydrogenated resin, 22-30 parts of mineral oil, and 0.1-1 part of additives.

[0013] As a preferred technical solution, the thermoplastic elastomer is at least one of styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), styrene-isoprene-styrene block copolymer (SIS), and hydrogenated styrene-isoprene-styrene block copolymer (SIS).

[0014] Preferably, the thermoplastic elastomer is a compound of styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS).

[0015] Preferably, the weight ratio of the styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1:(2-4):(6-8).

[0016] Preferably, the weight ratio of the styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1:3:7.

[0017] In the present application, the applicant found that when the thermoplastic elastomer is a compound of styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS), the prepared product has good adhesion and waterproof properties. This may be because the SIS block copolymer has a small cohesive energy and a strong adhesive ability, but a small amount of SBS block copolymer needs to be added to supplement a certain cohesive force, so that the prepared glue is more stable. The chloroprene rubber added to the system can play a filler role that increases the molecular chain density. After encountering air, fission and electrochemical reactions will occur, so that the water evaporates quickly to form a layer of film at the interface, avoiding the invasion of water, thereby effectively improving the waterproof performance of the product. Especially when the weight ratio of the styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1: (2-4): (6-8), the synergistic effect of the three is better and the effect is better.

[0018] Preferably, the S / B value of the styrene-butadiene-styrene block copolymer (SBS) is 30-32:68-70.

[0019] Preferably, the S / B value of the styrene-butadiene-styrene block copolymer (SBS) is 31:69.

[0020] Preferably, the model of the styrene-butadiene-styrene block copolymer (SBS) is ZL-H3611, purchased from Zhejiang Zhongli Synthetic Materials Technology Co., Ltd.

[0021] Preferably, the model of the styrene-butadiene rubber (SBR) is CR-248, purchased from Shanghai Zhengshang Chemical Technology Co., Ltd.

[0022] Preferably, the S / B value of the styrene-isoprene-styrene block copolymer (SIS) is 15-20:85-80.

[0023] Preferably, the S / B value of the styrene-isoprene-styrene block copolymer (SIS) is 16:84.

[0024] Preferably, the model of the styrene-isoprene-styrene block copolymer (SIS) is 1126, purchased from Qianyiyuan Synthetic Materials Technology Co., Ltd.

[0025] As a preferred technical solution, the hydrogenated resin is at least one of C5 hydrogenated petroleum resin, C9 hydrogenated petroleum resin, hydrogenated rosin resin, and hydrogenated terpene resin.

[0026] Preferably, the hydrogenated resin is a compound of C5 hydrogenated petroleum resin and hydrogenated rosin resin.

[0027] Preferably, the weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 7-9:2-4.

[0028] Preferably, the weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 8:3.

[0029] Preferably, the acid value of the hydrogenated rosin resin is 2-10.

[0030] Preferably, the model of the C5 hydrogenated petroleum resin is 5380, purchased from Foshan Ruisheng Plastic Co., Ltd.; the model of the hydrogenated rosin resin is KE-100, purchased from Guangzhou Jinshengji Chemical Co., Ltd.

[0031] In the system of the present invention, when the hydrogenated resin is a compound of C5 hydrogenated petroleum resin and hydrogenated rosin resin, especially when the weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 7-9:2-4, the adhesion performance of the product can be further improved. When applied to the label preparation process in the system of the present invention, there will be no problem of glue leakage, which is beneficial to industrial production.

[0032] As a preferred technical solution, the mineral oil is one of paraffin oil and naphthenic oil.

[0033] Preferably, the mineral oil is naphthenic oil.

[0034] In the system of the present invention, when naphthenic oil is added as the mineral oil, it has good compatibility with other components in the system, improves the dissolution performance of the system, and enhances the waterproof performance of the adhesive for labels. Especially in a humid environment, it can still maintain good waterproof performance. This may be because the high content of naphthenic hydrocarbons in naphthenic oil can enhance the wettability of the system, thus forming an isolation film on the surface, greatly improving the waterproof performance of the adhesive for labels prepared under this system.

[0035] As a preferred technical solution, the auxiliary agent is one of antioxidant, ultraviolet absorber, and anti-aging agent.

[0036] Preferably, the auxiliary agent is an antioxidant, and the antioxidant is a compound of antioxidant 1076 and antioxidant 164.

[0037] Preferably, the weight ratio of antioxidant 1076 to antioxidant 164 in the antioxidant is 1:0.5 - 0.8.

[0038] Preferably, the weight ratio of antioxidant 1076 to antioxidant 164 in the antioxidant is 1:0.65.

[0039] As a preferred technical solution, the method for preparing the adhesive for labels used in S2 includes the following steps:

[0040] S1. Heat the mineral oil to 110 - 130 °C and then add it to the thermoplastic elastomer for melting to obtain mixture a;

[0041] S2. Add the hydrogenated resin and the auxiliary agent to mixture a and stir, then raise the temperature of the reaction device to 130 - 150 °C and react for 10 - 20 min to obtain the adhesive for labels.

[0042] Preferably, it includes the following steps:

[0043] S1. Heat the mineral oil to 120 °C and then add it to the thermoplastic elastomer for melting to obtain mixture a;

[0044] S2. Add the hydrogenated resin and the auxiliary agent to mixture a and stir, then raise the temperature of the reaction device to 140 °C and react for 15 min to obtain the adhesive for labels.

[0045] As a preferred technical solution, in S4, multi-color printing is combined with white ink for printing.

[0046] Preferably, the types of colors used in the multi-color printing in S4 include 4-12 color classifications.

[0047] Preferably, the fineness of the white ink is 8-12 microns.

[0048] Preferably, the fineness of the white ink is 10 microns, the model is CAIJIESI, and it is purchased from Dongguan Caijiesi Printing Materials Co., Ltd.

[0049] On the other hand, the present invention discloses a waterproof label prepared by adopting the above preparation method. The present invention has the following beneficial effects: 1) By adopting the technical scheme of compounding thermoplastic elastomers as styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS), the prepared product has good adhesion performance and waterproof performance; 2) By adopting the technical scheme of compounding hydrogenated resin as C5 hydrogenated petroleum resin and hydrogenated rosin resin, the processability of the glue is improved, and the adhesion performance of the product is further improved; 3) By adding mineral oil as naphthenic oil, which has good compatibility with other components in the system, the solubility of the system is improved, and the waterproof performance of the label glue is improved. Especially in a humid environment, it can still maintain good waterproof performance; 4) Through the multi-color and multi-plate printing preparation scheme of the present invention, the prepared waterproof label has a metallic texture, achieving a clear effect of the main scene and the background, and can be applied to medium and high-grade gift box labels. Detailed Embodiments

[0050] Example 1

[0051] The embodiment 1 of the present invention provides a preparation method of a waterproof label, including the following steps:

[0052] S1. Cutting the label paper roll;

[0053] S2. Coating the label glue;

[0054] S3. Setting the printing label template;

[0055] S4. Performing multi-color and multi-plate printing;

[0056] S5. Thermocompression laminating;

[0057] S6. Die-cutting and winding to obtain a waterproof label.

[0058] The raw materials for preparing the label glue used in S2 include, by weight: 24 parts of thermoplastic elastomer, 25 parts of hydrogenated resin, 26 parts of mineral oil, and 0.6 parts of additive.

[0059] The thermoplastic elastomer is a blend of styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS).

[0060] The weight ratio of the styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1:3:7.

[0061] The S / B value of the styrene-butadiene-styrene block copolymer (SBS) is 31:69.

[0062] The model of the styrene-butadiene-styrene block copolymer (SBS) is ZL-H3611, purchased from Zhejiang Zhongli Synthetic Materials Technology Co., Ltd.

[0063] The model of the styrene-butadiene rubber (SBR) is CR-248, purchased from Shanghai Zhengshang Chemical Technology Co., Ltd.

[0064] The S / B value of the styrene-isoprene-styrene block copolymer (SIS) is 16:84.

[0065] The model of the styrene-isoprene-styrene block copolymer (SIS) is 1126, purchased from Qianyiyuan Synthetic Materials Technology Co., Ltd.

[0066] The hydrogenated resin is a blend of C5 hydrogenated petroleum resin and hydrogenated rosin resin.

[0067] The weight ratio of the C5 hydrogenated petroleum resin and hydrogenated rosin resin is 8:3.

[0068] The acid value of the hydrogenated rosin resin is 2 - 10.

[0069] The model of the C5 hydrogenated petroleum resin is 5380, purchased from Foshan Ruisheng Plastic Co., Ltd.; the model of the hydrogenated rosin resin is KE-100, purchased from Guangzhou Jinshengji Chemical Co., Ltd.

[0070] The mineral oil is naphthenic oil.

[0071] The model of the naphthenic oil is KN4010, purchased from Guangzhou Wanhong Chemical Co., Ltd.

[0072] The additive is an antioxidant, which is a blend of antioxidant 1076 and antioxidant 164. The weight ratio of antioxidant 1076 to antioxidant 164 in the antioxidant is 1:0.65.

[0073] The antioxidant 1076 was purchased from Guangzhou Yinuo Chemical Technology Co., Ltd., and the antioxidant 164 was purchased from Zhengzhou Yuhe Food Additive Co., Ltd.

[0074] The preparation method of the adhesive for labels used in S2 includes the following steps:

[0075] S1. Heat the mineral oil to 120°C and then add it to the thermoplastic elastomer for melting to obtain mixture a;

[0076] S2. Add the hydrogenated resin and the auxiliary agent to mixture a and stir. Raise the temperature of the reaction device to 140°C and react for 15 minutes to obtain the adhesive for labels.

[0077] In S4, multi-color printing is combined with white ink for printing.

[0078] The types of colors used in multi-color printing in S4 include 8 color classifications.

[0079] The 8 colors are black, yellow, magenta, cyan, red, blue, green, and white.

[0080] The fineness of the white ink is 10 microns, the model is CAIJIESI, and it was purchased from Dongguan Caijiesi Printing Materials Co., Ltd.

[0081] On the other hand, this embodiment discloses a waterproof label prepared by adopting the above preparation method.

[0082] Example 2

[0083] Embodiment 2 of the present invention provides a preparation method of a waterproof label. The specific implementation manner is the same as that of Embodiment 1, except that the raw materials for preparing the adhesive for labels used in S2 include, by weight: 20 parts of thermoplastic elastomer, 20 parts of hydrogenated resin, 22 parts of mineral oil, and 0.2 part of auxiliary agent.

[0084] The weight ratio of the styrene-butadiene-styrene block copolymer (SBS), chloroprene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1:2:6.

[0085] The weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 7:2.

[0086] The types of colors used in multi-color printing in S4 include 4 color classifications.

[0087] The 4 colors are yellow, magenta, cyan, and black.

[0088] Example 3

[0089] Example 3 of the present invention provides a method for preparing a waterproof label. The specific implementation is the same as that of Example 1, except that the raw materials for preparing the label glue used in S2 include, by weight: 28 parts of thermoplastic elastomer, 30 parts of hydrogenated resin, 30 parts of mineral oil, and 1 part of additive.

[0090] The weight ratio of the styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1:4:8.

[0091] The weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 9:4.

[0092] The types of multicolor printing colors used in S4 include 12 color classifications.

[0093] The 12 colors are red, orange-red, orange, orange-yellow, yellow, yellow-green, green, blue-green, blue, blue-violet, purple, and purple-red.

[0094] Comparative Example 1

[0095] Comparative Example 1 of the present invention provides a method for preparing a waterproof label. The specific implementation is the same as that of Example 1, except that the weight ratio of the styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 3:2:1.

[0096] Comparative Example 2

[0097] Comparative Example 2 of the present invention provides a method for preparing a waterproof label. The specific implementation is the same as that of Example 1, except that styrene-butadiene rubber (SBR) is not added.

[0098] Comparative Example 3

[0099] Comparative Example 3 of the present invention provides a method for preparing a waterproof label. The specific implementation is the same as that of Example 1, except that the weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 2:7.

[0100] Comparative Example 4

[0101] Comparative Example 4 of the present invention provides a method for preparing a waterproof label. The specific implementation is the same as that of Example 1, except that the mineral oil is 10 parts.

[0102] Performance test:

[0103] 1) Waterproofness: The waterproof labels prepared in the examples and comparative examples were pasted onto plastic bottles and completely immersed in water for 1 h. The state of the labels after immersion was evaluated and divided into three grades: A, B, and C. Grade A means the label did not blister or fall off; Grade B means the label blistered but did not fall off; Grade C means the label fell off.

[0104] 2) Peel strength: The peel strength from the anti-sticking material (PET material) under 180° conditions was tested with reference to the standard GB / T2792. The higher the peel strength, the better the adhesion.

[0105] The test results are shown in Table 1.

[0106] Table 1

[0107] Waterproofness Peel strength (N / 25mm) Example 1 A 50 Example 2 A 47 Example 3 A 48 Comparative Example 1 B 41 Comparative Example 2 B 42 Comparative Example 3 B 41 Comparative Example 4 B 40

Claims

1. A preparation method of a waterproof label, characterized in that, it comprises the following steps: S1. Cut the label paper roll; S2. Coat the label glue; S3. Set the printing label template; S4. Perform multi-color and multi-plate printing; S5. Thermocompression laminating; S6. Die-cut and wind up to obtain the waterproof label; The raw materials for preparing the label glue used in S2 include, by weight: 20-28 parts of thermoplastic elastomer, 20-30 parts of hydrogenated resin, 22-30 parts of mineral oil, 0.1-1 part of auxiliary agent; The thermoplastic elastomer is a compound of styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS); the weight ratio of the styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), and styrene-isoprene-styrene block copolymer (SIS) is 1:(2-4):(6-8); The hydrogenated resin is a compound of C5 hydrogenated petroleum resin and hydrogenated rosin resin, and the weight ratio of the C5 hydrogenated petroleum resin to the hydrogenated rosin resin is 7-9:2-4; The auxiliary agent is an antioxidant, and the antioxidant is a compound of antioxidant 1076 and antioxidant 164. The weight ratio of antioxidant 1076 to antioxidant 164 in the antioxidant is 1:0.5-0.

8.

2. The preparation method of a waterproof label according to claim 1, characterized in that, the mineral oil is one of paraffin oil and naphthenic oil.

3. The preparation method of a waterproof label according to claim 1, characterized in that, the preparation method of the label glue used in S2 comprises the following steps: S1. Heat the mineral oil to 110-130 °C and then add it to the thermoplastic elastomer for melting to obtain mixture a; S2. Add the hydrogenated resin and the auxiliary agent to mixture a and stir, raise the temperature of the reaction device to 130-150 °C and react for 10-20 min to obtain the label glue.

4. The preparation method of a waterproof label according to claim 1, characterized in that, in S4, multi-color printing is combined with white ink for printing.

5. A waterproof label prepared by the preparation method of the waterproof label according to any one of claims 1-4.