阅读说明：本技术 一种可降解胶带及其制备方法 (Degradable adhesive tape and preparation method thereof ) 是由 黄爱宾 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种可降解胶带及其制备方法。一种可降解胶带,包括基膜层、离型层以及胶黏层；基膜层两面分别涂布离型层、胶黏层；所述的基膜层由PBAT或PBAT/PLA共混物拉伸而成；离型层由包含硅油的原料制成；胶黏层由聚乙二醇与二氯二苯砜合成。本发明可降解胶带可以应用于快递、物流、纸箱封合等领域,具有环保可降解、防水防潮、强度韧性高等优点,解决了现有快递行业普通BOPP胶带与纸箱不易拆分和带来的白色污染的问题。(The invention discloses a degradable adhesive tape and a preparation method thereof. A degradable adhesive tape comprises a base film layer, a release layer and an adhesive layer; coating a release layer and an adhesive layer on two sides of the base film layer respectively; the base film layer is formed by stretching PBAT or PBAT/PLA blend; the release layer is made of raw materials containing silicone oil; the adhesive layer is synthesized by polyethylene glycol and dichlorodiphenyl sulfone. The degradable adhesive tape can be applied to the fields of express delivery, logistics, carton sealing and the like, has the advantages of environmental protection, degradability, water resistance, moisture resistance, high strength and toughness and the like, and solves the problems that the common BOPP adhesive tape and the carton in the existing express delivery industry are not easy to split and cause white pollution.)

1. A degradable adhesive tape is characterized by comprising a base film layer, a release layer and an adhesive layer; the two sides of the base film layer are respectively coated with a release layer and an adhesive layer; the base film layer is formed by stretching PBAT or PBAT/PLA blend; the release layer is made of raw materials containing silicone oil; the adhesive layer is synthesized by polyethylene glycol and dichlorodiphenyl sulfone.

2. The degradable tape of claim 1, wherein: the base film layer comprises the following components in parts by weight:

3. the degradable tape of claim 1, wherein: the release layer is prepared from a raw material containing silicone oil and comprises the following components in parts by weight:

4. a method for preparing the degradable adhesive tape of any one of claims 1-3, which is characterized by comprising the following steps:

(1) preparing a base film layer, and blending an adhesive and a release agent;

(2) coating a release agent on one surface of the base film layer to form a release layer;

(3) and coating adhesive on the other side of the base film layer to form an adhesive layer.

5. The method for preparing a degradable adhesive tape according to claim 4, wherein the adhesive is coated on the base film layer by hot melt lamination or solution lamination.

6. The method for preparing a degradable adhesive tape according to claim 4, wherein the preparation step of the base film layer comprises the following steps: preparing and extruding the PBAT or the PBAT/PLA blend and a certain amount of plasticizer epoxy soybean oil, preparing a film, and performing biaxial tension.

7. The method for preparing a degradable adhesive tape as claimed in claim 6, wherein in the step of preparing the base film layer, the extrusion granulation by twin screws and the extrusion blowing by single screw are adopted, the extrusion processing temperature is 165-190 ℃, the film is stretched bidirectionally, the stretching setting temperature is controlled to be 60-70 ℃ in the longitudinal direction, and 110 ℃ in the transverse direction.

8. The method for preparing degradable adhesive tape according to any one of claims 4-7, wherein the adhesive is prepared by the following steps: polyethylene glycol with the polymerization degree of 200, 400, 600 or 800 is mixed with dichlorodiphenyl sulfone with the same molar amount as hydroxyl in equal proportion, dimethyl sulfoxide is used as a solvent, distillation is carried out at the temperature of 135 ℃ and 160 ℃ for 6-12 hours, and xylene is used for distilling away generated water; precipitating the product in ether after the reaction is finished; dissolving with N' N-dimethylformamide, and reprecipitating and purifying with diethyl ether.

Technical Field

The invention belongs to the field of manufacturing of packaging auxiliary materials, and particularly relates to a degradable adhesive tape and a preparation method thereof.

Background

The adhesive tape consists of a base film and an adhesive, and two unconnected objects are connected together through bonding. The adhesive tape has a wide application range, and can be divided into an electrical insulating adhesive tape, a high-temperature resistant adhesive tape, a protective film adhesive tape, a box sealing adhesive tape, a carpet adhesive tape and the like according to the application.

At present, the express industry uses a large amount of sealing adhesive tapes, the base film materials of the adhesive tapes are mostly BOPP or PVC and other materials, the adhesives are mostly acrylate or ethylene-vinyl acetate copolymer adhesives, the performance of the adhesive tapes is excellent, the adhesive tapes have pressure-sensitive adhesive properties, but the base film materials and the adhesive materials are synthetic non-degradable materials, and in the large amount of using processes of the adhesive tapes, the base film materials and the adhesive materials are not easy to separate from a carton, so that the carton is difficult to recycle, and meanwhile, the non-degradable materials are easy to cause white pollution.

Chinese patent publication Nos. CN109796895A, CN109679519A, CN109517224A and other patent documents propose methods for solving the problem of adhesive tape degradation by using plant adhesives and the like, and although the technical schemes disclosed by the patents have the advantages, the plant adhesives do not have pressure-sensitive property, the adhesive coating process is complex, the adhesive coating process of the traditional non-degradable adhesive tape cannot be adopted, and inconvenience is brought to use and popularization.

In view of the above problems, there is a need to develop a degradable adhesive tape with simple and convenient adhesive coating process, convenient use and white pollution avoidance.

Disclosure of Invention

The invention mainly aims to provide a degradable adhesive tape which is simple and convenient in gluing process, convenient to use and capable of avoiding the problem of white pollution and a preparation method thereof. The degradable adhesive tape disclosed by the invention has the advantages of environmental friendliness, degradability and the like, white pollution can be effectively reduced, and the problem that the existing adhesive tape for the express industry is not environment-friendly is solved.

The invention adopts the following technical scheme:

a degradable adhesive tape comprises a base film layer, a release layer and an adhesive layer; coating a release layer and an adhesive layer on two sides of the base film layer respectively; the base film layer is formed by stretching PBAT (poly (butylene adipate/terephthalate)) or PBAT/PLA (poly (adipate/butylene terephthalate/polylactic acid)); the release layer is prepared from raw materials containing silicone oil; the adhesive layer is synthesized from polyethylene glycol (preferably polyethylene glycol 200, 400, 600, 800) and dichlorodiphenyl sulfone.

Preferably, the base film layer comprises the following components in parts by weight:

60-80 parts of PBAT

20-35 parts of PLA

0.5-3 parts of plasticizer epoxidized soybean oil

0.2 to 0.8 portion of lubricant

0.1-0.5 part of coupling agent.

Preferably, the release layer is prepared from the following raw material components:

vinyl polydimethylsiloxane (weight fraction 90 parts)

Methyl hydrogenpolysiloxane (weight fraction 4 parts)

Platinum catalyst (preferably chloroplatinic acid-isopropanol 1 part by weight)

Anchoring agent (preferably 3-glycidoxypropyltriethoxysilane 0.6 part by weight)

Inhibitor (preferably methyl butynol weight fraction 0.1 parts)

Toluene (preferably 300 parts by weight) as a solvent.

The invention also discloses a preparation method of the degradable adhesive tape, which comprises the following steps:

(1) preparing a base film layer, and blending an adhesive and a release agent;

(2) coating a release agent on one surface of the base film layer to form a release layer;

(3) and coating adhesive on the other side of the base film layer to form an adhesive layer.

Preferably, the adhesive is coated on the base film layer by hot melt compounding or solution compounding.

Preferably, the preparation step of the base film layer comprises: preparing and extruding the PBAT or the PBAT/PLA blend and a certain amount of plasticizer epoxy soybean oil, preparing a film, and performing biaxial tension.

Preferably, in the manufacturing step of the base film layer, double-screw extrusion granulation and single-screw extrusion film blowing are adopted, the extrusion processing temperature is 165-190 ℃, and the film is stretched in two directions. The stretching and setting temperature is controlled to be 60-70 ℃ in the longitudinal direction and 110 ℃ in the transverse direction.

Preferably, the preparation steps of the adhesive layer are as follows:

polyethylene glycol with the polymerization degree of 200, 400, 600 or 800 is mixed with dichlorodiphenyl sulfone with the same molar amount as hydroxyl in equal proportion, dimethyl sulfoxide is used as a solvent, distillation is carried out at the temperature of 135-160 ℃ for 6-12 hours, and xylene is distilled to carry away generated water. After the reaction was complete, the product was precipitated in diethyl ether. Dissolving with N' N-dimethylformamide, and reprecipitating and purifying with diethyl ether.

Preferably, the compounding step of the adhesive layer and the base film layer is as follows:

coating a release layer on the base film layer, coating organic silicon on one surface of the base film layer by adopting a two-roller transfer coating mode, drying by adopting a far infrared radiation drying mode, drying, cooling and rolling. Unreeling again, coating the base film layer with an adhesive on the other side of the non-coated release layer to form an adhesive layer, wherein the coating method is solution coating, dissolving the adhesive by adopting ethyl acetate or N' N-dimethylformamide to prepare an adhesive solution, coating the adhesive solution on the base film layer by adopting 200-250 linear gravure, and performing infrared drying at the drying temperature of 45-60 ℃. Cooling, rolling and cutting.

The adhesive tape prepared by the preparation method disclosed by the invention realizes the degradability of the adhesive tape through the synthesis preparation of the adhesive tape base material and the adhesive layer, and the adhesive layer of the adhesive tape prepared by the preparation method has pressure sensitivity at room temperature, so that the adhesive layer can be widely applied to box sealing operation in the express industry, and the white pollution is reduced.

Drawings

FIG. 1 is a schematic diagram of the synthesis process of an adhesive according to a preferred embodiment.

Fig. 2 is a route diagram of a preparation method of the degradable adhesive tape according to a preferred embodiment.

Fig. 3 is a graph of a degradation test of the degradable adhesive tape in soil (soil with pH 6.0-6.5).

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

Unless defined otherwise, technical or scientific terms used in the present disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which the invention belongs.

Example one

A preparation method of a degradable adhesive tape comprises the following steps:

68 parts of PBAT, 23 parts of PLA, 2 parts of plasticizer epoxidized soybean oil, 0.5 part of lubricant stearic acid, 0.1 part of coupling agent titanate, 165-plus 175 ℃ double-screw extrusion granulation, 170 ℃ single-screw extrusion film blowing, the blow-up ratio is 4.0, and the traction ratio is 30. And (3) stretching the film in a two-way mode. The stretching and setting temperature is controlled to be 60-70 ℃ in the longitudinal direction and 110 ℃ in the transverse direction.

Meanwhile, a certain amount of dichlorodiphenyl sulfone is weighed and placed in a 1L round bottom flask, polyethylene glycol 400 with the molar quantity equal to that of the dichlorodiphenyl sulfone is added, thionyl chloride is used as a solvent, xylene is used as a water-carrying agent, the mixture is distilled for 12 hours in an oil bath at 160 ℃, and a product is placed in anhydrous ether for precipitation. Dissolving with N' N-dimethylformamide, and reprecipitating and purifying with diethyl ether. Preparing ethyl acetate into an adhesive solution.

Meanwhile, preparing an organic silicon release agent:

vinyl polydimethylsiloxane (weight fraction 90 parts)

Methyl hydrogenpolysiloxane (weight fraction 4 parts)

Platinum catalyst (chloroplatinic acid-isopropanol 1 part by weight)

Anchoring agent (3-glycidoxypropyltriethoxysilane 0.6 parts by weight)

Inhibitor (methyl butynol weight fraction 0.1 parts)

Toluene (300 parts by weight) as a solvent.

And (3) coating an organic silicon release agent on one side of the base film layer by adopting a two-roller transfer coating mode, drying by adopting a far infrared radiation drying mode, drying, cooling and rolling. Unreeling again, coating the base film layer with an adhesive on the other side of the non-coating release layer, wherein the coating method comprises solution coating, coating the adhesive solution on the base film layer by adopting 250-line gravure, and performing infrared drying at the drying temperature of 45-60 ℃. Cooling, rolling and cutting.

The sticky tape that this embodiment made can be applied to fields such as express delivery trade involution carton to avoid white pollution problem.

Example two

A preparation method of a degradable adhesive tape comprises the following steps:

60 parts of PBAT, 35 parts of PLA, 3 parts of plasticizer epoxidized soybean oil, 0.8 part of lubricant stearic acid, 0.2 part of coupling agent titanate, 170-DEG C180 ℃ double-screw extrusion granulation, 190 ℃ single-screw extrusion film blowing, the blow-up ratio is 4.5, and the traction ratio is 33. And (3) stretching the film in a two-way mode. The stretching and setting temperature is controlled to be 65-70 ℃ in the longitudinal direction and 110 ℃ in the transverse direction.

Meanwhile, a certain amount of dichlorodiphenyl sulfone is weighed and placed in a 1L round bottom flask, polyethylene glycol 200 with the molar quantity equal to that of the dichlorodiphenyl sulfone is added, thionyl chloride is used as a solvent, xylene is used as a water-carrying agent, the mixture is distilled for 10 hours in an oil bath at the temperature of 140 ℃, and a product is placed in anhydrous ether for precipitation. Dissolving with N' N-dimethylformamide, and reprecipitating and purifying with diethyl ether. Preparing the N' N-dimethylformamide into an adhesive solution.

Meanwhile, preparing an organic silicon release agent:

vinyl polydimethylsiloxane (weight fraction 90 parts)

Methyl hydrogenpolysiloxane (weight fraction 4 parts)

Platinum catalyst (chloroplatinic acid-isopropanol 1 part by weight)

Anchoring agent (3-glycidoxypropyltriethoxysilane 0.6 parts by weight)

Inhibitor (0.1 part of methylbutinol by weight),

toluene (300 parts by weight) as a solvent.

And (3) coating an organic silicon release agent on one side of the base film layer by adopting a two-roller transfer coating mode, drying by adopting a far infrared radiation drying mode, drying, cooling and rolling. Unreeling again, coating the base film layer with an adhesive on the other side of the non-coating release layer by solution coating, coating the adhesive solution on the base film layer by adopting 200-line gravure, and performing infrared drying at 50-60 ℃. Cooling, rolling and cutting.

The degradable adhesive tape disclosed by the invention can be applied to the fields of express delivery, logistics, carton sealing and the like, has the advantages of environmental protection, degradability, water resistance, moisture resistance, high strength and toughness and the like, and solves the problems that the common BOPP adhesive tape and the carton in the existing express delivery industry are not easy to split and cause white pollution.