Stripping layer of interlayer separation membrane and preparation method of stripping layer

Abstract

The invention discloses a stripping layer of an interlayer separation membrane and a preparation method thereof, and the stripping layer of the interlayer separation membrane comprises a bottom glue layer and a surface glue layer arranged on the bottom glue layer; the raw material of the primer layer comprises at least one of chlorine wax resin, acrylic resin or cellulose acetate; the raw material of the surface glue layer comprises polyurethane glue; the coating weight of the primer layer is 0.05-3 g / m < 2 >; and the coating weight of the surface adhesive layer is 0.5-5g / m < 2 >. According to the invention, the stripping layer of the interlayer separation film is formed by a specific type and a specific amount of colloid components, so that the aim of effectively separating a barrier layer and a heat sealing layer in the interlayer separation film can be effectively fulfilled, and the problem of obvious adhesive residual traces after stripping can be effectively solved; and the residual trace area of the adhesive can be reduced to 50% or below, so that the sensory experience is remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of packaging, and in particular to a peeling layer of an interlayer separation film and a preparation method thereof. Background Art

[0002] Conventional cover films are usually made of a barrier layer and a heat-sealing layer, and their overall thickness is less than 200um. When in use, straws are usually inserted, which not only requires straws, but also often causes the straws to be damaged and unable to be inserted into the cup when the cover film is hard or the straws are not set properly, which is very inconvenient to operate; and the use of straws is also extremely environmentally unfriendly.

[0003] In order to overcome the problems of existing straws being environmentally unfriendly and being damaged when inserted into the cover film, resulting in inconvenience in operation, an interlayer separation membrane with at least three layers has been developed. The interlayer separation membrane is a barrier layer, a peeling layer, and a heat-sealing layer from the outside to the inside. The peeling layer is formed by curing between the barrier layer and the heat-sealing layer using an existing low-strength adhesive, and a drinking port is provided on the heat-sealing layer. When using a cup with the interlayer separation membrane, you only need to peel off the barrier layer, keep the heat-sealing layer on the cup body, and drink without a straw through the drinking port reserved on the heat-sealing layer, thus avoiding the problem of damage to the straw when the straw is inserted into the cover film.

[0004] However, during the use of the interlayer separation membrane, it was found that even if a low-strength adhesive was used to form the peeling layer, the peeling strength would be relatively large while ensuring the sealing performance, and the minimum peeling strength would reach more than 6N / 15mm, which made the operation very inconvenient and even destroyed the overall structure of the interlayer separation membrane during peeling. And when the barrier layer was peeled off to expose the drinking port, there would be very obvious adhesive residue marks on the heat seal layer, resulting in a poor sensory experience for consumers. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is that the conventional adhesive disclosed in the prior art forms a peeling layer and there are obvious traces of adhesive residue after peeling; thus, a peeling layer of an interlayer separation membrane and a preparation method thereof are provided to solve the above problem.

[0006] To this end, the present invention provides the following technical solutions:

[0007] A peeling layer of an interlayer separation film comprises a base adhesive layer and a surface adhesive layer arranged on the base adhesive layer; the raw material of the base adhesive layer comprises at least one of chlorinated wax resin, acrylic resin or cellulose acetate; the raw material of the surface adhesive layer comprises polyurethane glue;

[0008] The coating amount of the primer layer is 0.05-3.0 g / m 2 The coating amount of the surface adhesive layer is 0.5-5g / m2 .

[0009] For example: the coating amount of the primer layer can be 0.05g / m 2 , 0.10g / m 2 , 0.15g / m 2 , 0.20g / m 2 , 0.25g / m 2 , 0.30g / m 2 , 0.35g / m 2 , 0.5g / m 2 , 1.0g / m 2 , 1.5g / m 2 , 2.0g / m 2 , 2.5g / m 2 3.0g / m 2 For example, the coating amount of the surface adhesive layer can be 0g / m 2 , 0.10g / m 2 , 0.2g / m 2 , 0.3g / m 2 , 0.4g / m 2 , 0.5g / m 2 , 1.0g / m 2 , 1.5g / m 2 , 2.0g / m 2 , 2.5g / m 2 3.0g / m 2 3.5g / m 2 4.0g / m 2 4.5g / m 2 5.0g / m 2 .

[0010] Preferably, the coating amount of the primer layer is 0.05-3 g / m 2 The coating amount of the surface adhesive layer is 0.5-4.5g / m 2 .

[0011] Furthermore, the raw material of the base glue layer is a chlorinated wax resin colloid solution, including a chlorinated wax resin colloid and a diluent; the chlorinated wax resin colloid includes a chlorinated wax resin and a solvent, or includes a chlorinated wax resin, an acrylic resin and a solvent; the mass proportion of the chlorinated wax resin in the chlorinated wax resin colloid is greater than 15%, and the solid content of the chlorinated wax resin colloid is 20%-25%;

[0012] And / or, the raw material of the base glue layer is an acrylic ester colloid, the acrylic ester colloid comprises an acrylic resin and a solvent, and the solid content of the acrylic ester colloid is 25%-50%;

[0013] And / or, the raw material of the base glue layer is cellulose acetate colloid solution, including cellulose acetate colloid and diluent; preferably, the volume ratio of the cellulose acetate colloid and the diluent is (1-5):(1-5); the cellulose acetate colloid includes cellulose acetate and a solvent, and the content of cellulose acetate in the cellulose acetate colloid is 10%-30%, preferably 15%-25%.

[0014] The chlorinated wax resin colloid, cellulose acetate colloid, acrylate colloid and polyurethane glue in the present invention are all conventional reagent products that can be purchased commercially.

[0015] The chlorinated wax resin colloid is a colloidal solution obtained by compounding chlorinated wax resin with a solvent, or a colloidal solution obtained by compounding chlorinated wax resin with an acrylic resin and a solvent, with a conventional solid content of 20%-25%, and the mass proportion of chlorinated wax resin in the chlorinated wax resin colloid is greater than 15%; for example, the PTP Fuli 711 primer (PTP-711 primer) containing chlorinated wax resin colloid sold by Shanghai Licai Ink Co., Ltd. or the PTP Fuli 38D primer (PTP-38D primer) of Shanghai Fengcai Industrial Co., Ltd. includes 15% chlorinated wax resin and 5% acrylic resin, and the rest is solvent. When the chlorinated wax resin colloid is diluted with a diluent, the ratio of the chlorinated wax resin colloid to the diluent is 18: (0.4-1).

[0016] The cellulose acetate colloid is a colloid obtained by mixing cellulose acetate and a solvent. The content of conventional cellulose acetate in the cellulose acetate colloid is 10%-30%, and the cellulose acetate colloid with a solid content of 15%-25% is preferred. The cellulose acetate colloid can be directly purchased by using cellulose acetate and a solvent in combination, such as a commercially available cellulose acetate and ethyl acetate, or by using nitrocellulose CAS: 9004-70-0 instead of cellulose acetate. The cellulose acetate colloid can also be used after being diluted with a diluent. When the cellulose acetate colloid is diluted with a diluent, the volume ratio of the cellulose acetate colloid and the diluent is (1-5):(1-5).

[0017] The acrylate colloid is a colloid obtained by mixing an acrylic resin and a solvent, and its conventional solid content is 25%-55%. The acrylate colloid can be purchased and used directly, such as commercially available DEGALAN VP 4294 E, 4150 E, PM666 and other types of acrylate colloids; it can also be used after being diluted with a diluent. When the diluent is used for dilution, the volume ratio of the acrylate colloid to the diluent is (1-5):(1-5).

[0018] The diluent is one or more of ethyl acetate, propyl acetate and butanone.

[0019] The polyurethane glue is a two-component polyurethane adhesive, which includes a main agent, a curing agent and a solvent; it is composed of polyol and isocyanate or polyester polyurethane and isocyanate dissolved in a solvent in a certain proportion, and the conventional solid content is 15-50%; all commercially available two-component polyurethane adhesives can achieve the purpose of the present invention, such as commercially available KUB-385S / CL-100, LH-3721A / LH-3721B, DICDRY LX-563 / KW75, LOCTITELIOFOL LA 2860 / LA 5001, NOVACOTE NC-270-A / CA-12, etc. have been verified to be able to achieve the purpose of the present invention.

[0020] When the raw material of the primer layer is a chlorinated wax resin colloidal solution, the coating amount of the primer layer is 0.05-0.3 g / m 2 The coating amount of the surface adhesive layer is 0.5-3g / m 2 ;

[0021] When the raw material of the primer layer is acrylic ester colloid and the coating amount of the primer layer is 0.05-0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-3g / m 2 ; When the base glue layer is made of acrylic colloid and the coating amount of the base glue layer is greater than 0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-4g / m 2 ;

[0022] When the raw material of the base glue layer is cellulose acetate colloidal solution and the coating amount of the base glue layer is 0.05-0.4 g / m 2 When the coating amount of the surface adhesive layer is 0.5-3g / m 2 When the raw material of the base glue layer is cellulose acetate colloidal solution and the coating amount of the base glue layer is greater than 0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-4g / m 2 .

[0023] The polyurethane glue is a two-component polyurethane adhesive.

[0024] The two-component polyurethane adhesive comprises a main agent, a curing agent and a solvent;

[0025] And / or, the solid content of the two-component polyurethane adhesive is 15-50%, preferably 20-40%.

[0026] The raw materials of the surface adhesive layer also include an auxiliary agent which is mixed with the polyurethane glue to form a composite colloid. The amount of the auxiliary agent added is within 3% of the total mass of the composite colloid.

[0027] The auxiliary agent is silicone oil;

[0028] And / or, the additive is added in an amount of 0.5%-1.5% of the total mass of the composite colloid.

[0029] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0030] Firstly, the raw material of the primer layer is coated on the barrier layer to form the primer layer;

[0031] Then, a surface adhesive layer is formed by coating the surface adhesive layer with raw materials on the base adhesive layer;

[0032] Finally, the base adhesive layer and the surface adhesive layer are cured together to form a peeling layer.

[0033] The technical solution of the present invention has the following advantages:

[0034] 1. The peeling layer of an interlayer separation membrane provided by the present invention at least comprises a base glue layer; the base glue layer is formed by a cellulose acetate colloid or a chlorinated wax resin colloid. The present invention forms the peeling layer of the interlayer separation membrane by using a specific type and a specific amount of colloid components, which can not only effectively meet the purpose of effectively separating the barrier layer and the heat sealing layer in the interlayer separation membrane, but also effectively achieve the problem of no obvious adhesive residue marks after peeling, and can reduce the adhesive residue mark area to less than 50%, significantly improving the sensory experience.

[0035] 2. The present invention provides a peeling layer of an interlayer separation membrane, further optimizing the composition and coating amount of the peeling layer. Specifically, the coating amount of the primer layer is limited to 0.05-3 g / m 2 The coating amount of the surface adhesive layer is 0.5-4.5g / m 2 At the same time, the raw materials of the surface adhesive layer include polyurethane glue and additives, which can not only effectively avoid the problem of obvious adhesive residue traces after peeling, but also significantly reduce the peeling strength between the barrier layer and the heat sealing layer in the interlayer separation film, improve the easy-to-peel performance, and further improve the sensory experience.

[0036] 3. When the coating amount of the peeling layer of the interlayer separation film provided by the present invention is too high, the peeling strength is too high, the peeling operation is not convenient, and the cost is increased accordingly; when the coating amount is too low, it will result in failure to completely cover the barrier layer in the interlayer separation film, resulting in poor sealing performance; therefore, the coating amount between the primer layer and the top glue layer is further limited in the present invention, specifically:

[0037] When the raw material of the primer layer is a chlorinated wax resin colloidal solution, the coating amount of the primer layer is 0.05-0.3 g / m 2 The coating amount of the surface adhesive layer is 0.5-3g / m 2 ;

[0038] When the raw material of the primer layer is acrylic ester colloid and the coating amount of the primer layer is 0.05-0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-3g / m 2 ; When the base glue layer is made of acrylic colloid and the coating amount of the base glue layer is greater than 0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-4g / m 2 ;

[0039] When the raw material of the base glue layer is cellulose acetate colloidal solution and the coating amount of the base glue layer is 0.05-0.4 g / m 2 When the coating amount of the surface adhesive layer is 0.5-3g / m 2 When the raw material of the base glue layer is cellulose acetate colloidal solution and the coating amount of the base glue layer is greater than 0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-4g / m 2 Under the above coating amount setting, the peel strength can be reduced to below 4N / 15mm, further improving the easy-to-peel performance, with significant effects.

[0040] 4. The peeling layer of the interlayer separation membrane provided by the present invention further optimizes the raw material composition of the base adhesive layer, preferably an acrylic colloid. At this time, under the coating amount of the present invention, not only can it achieve better easy-to-peel performance without the need for an auxiliary agent, but also no apparent adhesive residue will appear after peeling, and the effect is more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 This is a picture of the interlayer separation membrane prepared by the method of Example 1 of the present invention after the peeling layer is peeled off;

[0043] Figure 2 This is a picture of the interlayer separation membrane prepared by the method of Comparative Example 1 of the present invention after the peeling layer is peeled off. DETAILED DESCRIPTION

[0044] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0045] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0046] The coating amount in the present invention is the weight of the corresponding layer in the finished product within a unit detection area at the detection position.

[0047] Example 1

[0048] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0049] Chlorinated wax resin colloid (PTP-711 primer) and polyurethane glue (NOVACOTE NC-270-A / CA-12) were obtained respectively; wherein, the chlorinated wax resin colloid and ethyl acetate (diluent) were mixed in a mass ratio of 18:0.4 to prepare the chlorinated wax resin colloid solution. In this embodiment, the solid content of the chlorinated wax resin colloid is 20%, and the solid content of the polyurethane glue is 20%.

[0050] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then use polyurethane glue to apply on the base glue layer, and dry to obtain the surface glue layer. The coating amount of the surface glue layer is 3.5-4.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on one side of the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0051] Example 2

[0052] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0053] Chlorinated wax resin colloid (PTP-711 primer) and polyurethane glue (NOVACOTE NC-270-A / CA-12) were obtained respectively; wherein, the chlorinated wax resin colloid and ethyl acetate (diluent) were mixed in a mass ratio of 18:0.4 to prepare the chlorinated wax resin colloid solution. In this embodiment, the solid content of the chlorinated wax resin colloid is 25%. The solid content of the polyurethane glue is 20%.

[0054] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then use polyurethane glue to coat the base glue layer, and dry it to obtain the surface glue layer. The coating amount of the surface glue layer is 2-3g / m 2 The heat sealing layer of the interlayer separation film is compounded on one side of the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0055] Example 3

[0056] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0057] A chlorinated wax resin colloid solution and a composite colloid were prepared respectively; wherein, the chlorinated wax resin colloid solution was prepared by mixing the chlorinated wax resin colloid (PTP-711 primer) and ethyl acetate in a mass ratio of 18:0.4, and the solid content of the chlorinated wax resin colloid was 20%. The composite colloid consisted of polyurethane glue and an auxiliary agent, the polyurethane glue was the polyurethane glue in Example 1, and the composite colloid was prepared by adding 0.5% of the total mass of 8450 auxiliary silicone oil to the polyurethane glue.

[0058] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 The composite colloid is coated on the base adhesive layer and dried to obtain the surface adhesive layer. The coating amount of the surface adhesive layer is 2-3g / m 2 The heat sealing layer of the interlayer separation film is compounded on one side of the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0059] Example 4

[0060] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0061] A chlorinated wax resin colloid solution and a composite colloid were prepared respectively; wherein the chlorinated wax resin colloid solution was prepared by mixing chlorinated wax resin colloid (PTP-711 primer) and ethyl acetate in a mass ratio of 18:0.4, and the solid content of the chlorinated wax resin colloid was 20%. The composite colloid consisted of polyurethane glue and an auxiliary agent, the polyurethane glue was the polyurethane glue in Example 1, and the composite colloid was prepared by adding 1% of total mass of silicone oil to the polyurethane glue.

[0062] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then use the composite glue to coat the base glue layer, and dry it to obtain the surface glue layer. The coating amount of the surface glue layer is 2-3g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0063] Embodiment 5:

[0064] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0065] A chlorinated wax resin colloid solution and a composite colloid were prepared respectively; wherein, the chlorinated wax resin colloid solution was prepared by mixing the chlorinated wax resin colloid (PTP-38D primer) and ethyl acetate in a mass ratio of 18:0.4, and the solid content of the chlorinated wax resin colloid was 20%. The composite colloid consisted of polyurethane glue and an auxiliary agent, the polyurethane glue was the polyurethane glue in Example 1, and the composite colloid was prepared by adding 1% of silicone oil in total mass to the polyurethane glue.

[0066] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 1.5-2.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0067] Embodiment 6:

[0068] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0069] A chlorinated wax resin colloid solution and a composite colloid were prepared respectively; wherein the chlorinated wax resin colloid solution was prepared by mixing a chlorinated wax resin colloid (PTP-711 primer) and ethyl acetate in a mass ratio of 18:0.4, and the solid content of the chlorinated wax resin was 20%. The composite colloid consisted of polyurethane glue and an additive, the model of the polyurethane glue was the same as that in Example 1, and the composite colloid was prepared by adding 1.5% of silicone oil in total mass to the polyurethane glue.

[0070] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 1.5-2.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0071] Embodiment 7:

[0072] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0073] Chlorinated wax resin colloid solution and composite colloid were prepared respectively; wherein, the chlorinated wax resin colloid solution was prepared by mixing chlorinated wax resin colloid (PTP-711 primer) and ethyl acetate in a mass ratio of 18:0.6, and the solid content of chlorinated wax resin was 20%. The composite colloid was composed of polyurethane glue and additives, the model of polyurethane glue was NOVACOTE NC-270-A / CA-12, and the solid content was 20%; the composite colloid was mixed by adding 1.5% of total mass of silicone oil to polyurethane glue.

[0074] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 0.5-1.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0075] Embodiment 8:

[0076] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0077] A chlorinated wax resin colloid solution and a composite colloid were prepared respectively; wherein the chlorinated wax resin colloid solution was prepared by mixing a chlorinated wax resin colloid (PTP-711 primer) and ethyl acetate in a mass ratio of 18:1, and the solid content of the chlorinated wax resin was 20%. The composite colloid consisted of polyurethane glue and an additive, the polyurethane glue was the polyurethane glue in Example 1, and the composite colloid was mixed by adding 1.5% of silicone oil in total mass to the polyurethane glue.

[0078] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 ; Then the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 0.5-1.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0079] Embodiment 9:

[0080] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0081] A chlorinated wax resin colloid solution and a composite colloid were prepared respectively; wherein the chlorinated wax resin colloid solution was prepared by mixing a chlorinated wax resin colloid (PTP-711 primer) and ethyl acetate in a mass ratio of 18:0.4, and the solid content of the chlorinated wax resin was 20%. The composite colloid consisted of polyurethane glue and an additive, the model of the polyurethane glue was the same as that in Example 1, and the composite colloid was prepared by adding 1.5% of silicone oil in total mass to the polyurethane glue.

[0082] Stripping layer forming: first apply chlorinated wax resin colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 2-3g / m 2 ; Then the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 0.5-1.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0083] Embodiment 10:

[0084] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0085] A cellulose acetate colloid solution and a polyurethane glue were prepared respectively; wherein the cellulose acetate colloid solution was prepared by diluting a cellulose acetate colloid and ethyl acetate in a mass ratio of 1:1; and the cellulose acetate colloid was prepared by mixing cellulose acetate and ethyl acetate in a mass ratio of 20:80. The polyurethane glue was the polyurethane glue in Example 1, in which no auxiliary agent was added.

[0086] Stripping layer forming: firstly, apply cellulose acetate colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.2-0.4g / m 2 ; Then use polyurethane glue to apply on the base glue layer, and after drying, form a surface glue layer. The coating amount of the surface glue layer is 1.5-2.0g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0087] Embodiment 11:

[0088] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0089] A cellulose acetate colloid solution and a polyurethane glue were prepared respectively; wherein the cellulose acetate colloid solution was prepared by diluting a cellulose acetate colloid and ethyl acetate in a mass ratio of 1:5; and the cellulose acetate colloid was prepared by mixing cellulose acetate and ethyl acetate in a mass ratio of 20:80. The polyurethane glue was the polyurethane glue in Example 1, in which no auxiliary agent was added.

[0090] Stripping layer forming: firstly, apply cellulose acetate colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.2-0.4g / m 2 ; Then use polyurethane glue to apply on the base glue layer, and after drying, form a surface glue layer. The coating amount of the surface glue layer is 1.5-2.0g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0091] Embodiment 12:

[0092] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0093] A cellulose acetate colloid solution and a polyurethane glue were prepared respectively; wherein the cellulose acetate colloid solution was prepared by diluting a cellulose acetate colloid and ethyl acetate in a mass ratio of 5:1; and the cellulose acetate colloid was prepared by mixing cellulose acetate and ethyl acetate in a mass ratio of 20:80. The polyurethane glue was the polyurethane glue in Example 1, in which no auxiliary agent was added.

[0094] Stripping layer forming: firstly, apply cellulose acetate colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.2-0.4g / m 2 ; Then use polyurethane glue to apply on the base glue layer, and after drying, form a surface glue layer. The coating amount of the surface glue layer is 1.5-2.0g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0095] Embodiment 13:

[0096] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0097] A cellulose acetate colloid solution and a composite colloid were prepared respectively; wherein the cellulose acetate colloid solution was prepared by diluting the cellulose acetate colloid and ethyl acetate in a mass ratio of 1:1; the cellulose acetate colloid was prepared by mixing cellulose acetate and ethyl acetate in a mass ratio of 20:80. The composite colloid was prepared by adding 0.5% of the total mass of 8450 auxiliary silicone oil to polyurethane glue, and the polyurethane glue was the polyurethane glue in Example 1.

[0098] Stripping layer forming: firstly, apply cellulose acetate colloidal solution on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.2-0.4g / m 2 ; Then the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 1.5-2.0g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0099] Embodiment 14:

[0100] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0101] Acrylic ester colloid and polyurethane glue are obtained respectively; wherein, the acrylate colloid brand is 4150E; Direct coating, polyurethane glue brand is DICDRY LX-563 / KW75, no additives are added.

[0102] Stripping layer forming: first apply acrylic colloid on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 1.5-2.05g / m 2 ; Then use polyurethane glue to apply on the base glue layer, and after drying, form a surface glue layer. The coating amount of the surface glue layer is 3.5-4.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0103] Embodiment 15:

[0104] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0105] Acrylic resin colloid solution and polyurethane glue are obtained respectively; wherein the acrylic resin colloid solution is The acrylic resin colloid of 4150 E; the polyurethane glue is the glue in Example 1, wherein no additives are added.

[0106] Stripping layer forming: First, directly coat the barrier layer of the interlayer separation film with the grade of 4150 E acrylic resin colloid forms a primer layer after drying. The coating amount of the primer layer is 1.5-2.05g / m 2 ; Then use polyurethane glue to apply on the base glue layer, and after drying, form a surface glue layer. The coating amount of the surface glue layer is 3.5-4.5g / m 2 The heat sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute the peeling layer.

[0107] Embodiment 16:

[0108] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0109] Acrylic resin colloid and polyurethane glue are obtained respectively; wherein the grade of acrylic resin colloid is 4150 E, directly applied without dilution with ethyl acetate. The polyurethane glue grade is KUB-385S / CL-100, in which no additives are added.

[0110] Stripping layer forming: firstly, acrylic resin colloid is applied on the barrier layer of the interlayer separation film, and after drying, a primer layer is formed. The coating amount of the primer layer is 1.5-2.0g / m 2 Then, polyurethane glue is applied on the base glue layer to form a surface glue layer after drying. The coating amount of the surface glue layer is 3-4g / m 2 .

[0111] The heat-sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute a peeling layer.

[0112] Embodiment 17:

[0113] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0114] Acrylic resin colloid and polyurethane glue are obtained respectively; wherein, the acrylic resin colloid model is 4150 E, not diluted with ethyl acetate, directly applied. The polyurethane glue grade is LX-563 / KW75, and no additives are added to the polyurethane.

[0115] Stripping layer forming: first apply acrylic resin colloid on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 1.5-2.0g / m 2 Then, polyurethane glue is applied on the base glue layer to form a surface glue layer after drying. The coating amount of the surface glue layer is 3-4g / m 2 .

[0116] The heat-sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute a peeling layer.

[0117] Embodiment 18:

[0118] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0119] Acrylic resin colloid and polyurethane glue are obtained respectively; wherein, the acrylic resin colloid model is 4150 E, not diluted with ethyl acetate, directly applied. The polyurethane glue grade is LX-563 / KW75, and no additives are added to the polyurethane.

[0120] Stripping layer forming: first apply acrylic resin colloid on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2Then, polyurethane glue is applied on the base glue layer to form a surface glue layer after drying. The coating amount of the surface glue layer is 1.5-2g / m 2 .

[0121] The heat-sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute a peeling layer.

[0122] Embodiment 19:

[0123] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0124] Acrylic resin colloid and polyurethane glue are obtained respectively; wherein, the acrylic resin colloid model is 4150 E, not diluted with ethyl acetate, directly applied. The polyurethane glue grade is LX-563 / KW75, and no additives are added to the polyurethane.

[0125] Stripping layer forming: first apply acrylic resin colloid on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 0.05-0.15g / m 2 Then, polyurethane glue is applied on the base glue layer to form a surface glue layer after drying. The coating amount of the surface glue layer is 0.5-1.5g / m 2 .

[0126] The heat-sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute a peeling layer.

[0127] Embodiment 20:

[0128] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0129] Acrylic resin colloid and composite colloid are obtained respectively; wherein, the acrylic resin colloid model is 4150 E, without diluting with ethyl acetate, directly coated. The composite colloid is prepared by adding 1% of the total weight of 8450 auxiliary silicone oil to polyurethane glue, and the polyurethane glue is the polyurethane glue in Example 1.

[0130] Stripping layer forming: first apply acrylic resin colloid on the barrier layer of the interlayer separation film, and form a primer layer after drying. The coating amount of the primer layer is 1.5-2.0g / m 2 Then, the composite colloid is applied on the base adhesive layer, and after drying, a surface adhesive layer is formed. The coating amount of the surface adhesive layer is 3-4g / m 2 .

[0131] The heat-sealing layer of the interlayer separation film is compounded on the side with the surface adhesive layer, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The base adhesive layer and the surface adhesive layer between the sealing layer and the barrier layer together constitute a peeling layer.

[0132] Comparative Example 1

[0133] A method for preparing a peeling layer of an interlayer separation membrane, comprising:

[0134] Obtain the same polyurethane glue as in Example 1;

[0135] Stripping layer molding: polyurethane glue is applied on the barrier layer and dried. The coating amount of the polyurethane glue is 3.5-4.5g / m 2 .

[0136] The heat-sealing layer of the interlayer separation film is compounded on the side with the polyurethane adhesive, and the sealing layer and the barrier layer are formed into an integral structure after heat curing at 65°C for 48 hours. The polyurethane adhesive between the sealing layer and the barrier layer is the peeling layer.

[0137] Experimental example:

[0138] An interlayer separation membrane was prepared by the method of the embodiment and the comparative example, and the prepared interlayer separation membrane and a PP cup were hot pressed at 240°C and 0.5MPa for 1s; after hot pressing, the cup was tested for sealing and easy peeling. The sealing test conditions are: negative pressure 50Kpa, whether there is leakage in 30s / 60s; the easy peeling test includes peeling process, peeling strength and peeling appearance.

[0139] The judging rules for the peeling process are as follows: if it is easy to peel off and it can be torn off smoothly, it is easy to peel off; if it is laborious to peel off but it can be torn off smoothly, it is slightly difficult to peel off; if it is laborious to peel off and there is uneven force or it cannot be torn off during the peeling process, it is difficult to peel off;

[0140] The peel strength is obtained by preparing a 15 mm sample film and performing a 180° peel test to detect the force used during peeling;

[0141] The peeling appearance judgment standard is: whether there is colloid residue after peeling, and the proportion of the colloid residue area in the entire peeling surface is calculated.

[0142] The test results of the above-mentioned sealing and easy-to-open properties are shown in Tables 1 and Figure 1-2 shown.

[0143] Table 1

[0144]

[0145]

[0146]

[0147] From the above results, it can be seen that adding a primer layer can effectively reduce the peel strength and improve the problem of apparent adhesive residue; the apparent residue of the primer layer is an acrylic adhesive better than that of chlorowax resin; when the primer layer is an acrylic adhesive, the amount of adhesive increases and the amount of the primer layer also needs to be increased; among them, Example 17 is the optimal formula, in which neither the primer nor the surface glue requires secondary processing, and can be directly applied with an appropriate coating amount, which is easier to operate.

[0148] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A peeling layer of an interlayer separation membrane, characterized in that: It comprises a base glue layer and a surface glue layer arranged on the base glue layer; the raw material of the base glue layer comprises at least one of chlorinated wax resin, acrylic resin or cellulose acetate; the raw material of the surface glue layer comprises polyurethane glue; The coating amount of the primer layer is 0.05-3g / m 2 The coating amount of the surface adhesive layer is 0.5-5g / m 2 .

2. The peeling layer of an interlayer separation membrane according to claim 1, characterized in that: The coating amount of the primer layer is 0.05-3g / m 2 The coating amount of the surface adhesive layer is 0.5-4.5g / m 2 .

3. The peeling layer of an interlayer separation membrane according to claim 1 or 2, characterized in that: The raw material of the base glue layer is a chlorinated wax resin colloid solution, including a chlorinated wax resin colloid and a diluent; the chlorinated wax resin colloid includes a chlorinated wax resin and a solvent, or includes a chlorinated wax resin, an acrylic resin and a solvent; the mass proportion of the chlorinated wax resin in the chlorinated wax resin colloid is greater than 15%, and the solid content of the chlorinated wax resin colloid is 20%-25%; Or, the raw material of the base glue layer includes acrylate colloid; preferably, the acrylate colloid includes acrylic resin and solvent, and the solid content of the acrylate colloid is 25%-55%; Alternatively, the raw material of the base glue layer is a cellulose acetate colloid solution, including cellulose acetate colloid and a diluent; preferably, the volume ratio of the cellulose acetate colloid and the diluent is (1-5):(1-5); the cellulose acetate colloid includes cellulose acetate and a solvent, and the content of cellulose acetate in the cellulose acetate colloid is 10%-30%, preferably 15%-25%.

4. The peeling layer of the interlayer separation membrane according to claim 3, characterized in that: The diluent is one or more of ethyl acetate, propyl acetate and butanone.

5. The peeling layer of an interlayer separation membrane according to claim 3 or 4, characterized in that: When the raw material of the primer layer is a chlorinated wax resin colloidal solution, the coating amount of the primer layer is 0.05-0.3 g / m 2 The coating amount of the surface adhesive layer is 0.5-3g / m 2 ; When the raw material of the primer layer is acrylic ester colloid and the coating amount of the primer layer is 0.05-0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-3g / m 2 ; When the base glue layer is made of acrylic colloid and the coating amount of the base glue layer is greater than 0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-4g / m 2 ; When the raw material of the base glue layer is cellulose acetate colloidal solution and the coating amount of the base glue layer is 0.05-0.4 g / m 2 When the coating amount of the surface adhesive layer is 0.5-3g / m 2 When the raw material of the base glue layer is cellulose acetate colloidal solution and the coating amount of the base glue layer is greater than 0.4g / m 2 When the coating amount of the surface adhesive layer is 0.5-4g / m 2 .

6. The peeling layer of an interlayer separation membrane according to any one of claims 1 to 5, characterized in that: The polyurethane glue is a two-component polyurethane adhesive.

7. The peeling layer of the interlayer separation membrane according to claim 6, characterized in that: The two-component polyurethane adhesive comprises a main agent, a curing agent and a solvent; And / or, the solid content of the two-component polyurethane adhesive is 15-50%, preferably 20-40%.

8. The peeling layer of an interlayer separation membrane according to any one of claims 1 to 7, characterized in that: The raw materials of the surface adhesive layer also include an auxiliary agent which is mixed with the polyurethane glue to form a composite colloid. The amount of the auxiliary agent added is within 3% of the total mass of the composite colloid.

9. The peeling layer of the interlayer separation membrane according to claim 8, characterized in that: The auxiliary agent is silicone oil; And / or, the additive is added in an amount of 0.5%-1.5% of the total mass of the composite colloid.

10. The method for preparing a peeling layer of an interlayer separation membrane according to any one of claims 1 to 9, characterized in that: include: Firstly, the raw material of the primer layer is coated on the barrier layer to form the primer layer; Then, a surface adhesive layer is formed by coating the surface adhesive layer with raw materials on the base adhesive layer; Finally, the base adhesive layer and the surface adhesive layer are cured together to form a peeling layer.

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