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CN-121991602-A - Starch-based adhesive for paper tape, and preparation method and application thereof

CN121991602ACN 121991602 ACN121991602 ACN 121991602ACN-121991602-A

Abstract

The invention provides a starch-based adhesive for a paper tape, a preparation method and application thereof, and relates to the technical field of adhesives. The starch-based adhesive for the paper adhesive tape comprises a main component and water, wherein the main component accounts for 5-10% by weight, and comprises starch, polyvinyl alcohol and sodium carboxymethyl cellulose in a weight ratio of 25-75:75-25:3-7. According to the invention, starch, polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) form a blending system, and hydrogen bonds and chains among three components are intertwined to form a physical cross-linked network, so that the prepared starch-based adhesive can realize dry dormancy (non-adhesion) and wet rapid activation (high initial adhesion) at the same time.

Inventors

  • An xingye
  • DONG SHAN
  • JIA MENGZHEN
  • LIU LIQIN

Assignees

  • 天津科技大学

Dates

Publication Date
20260508
Application Date
20260310

Claims (8)

  1. 1. The starch-based adhesive for the paper tape is characterized by comprising a main component and water, wherein the mass percentage of the main component is 5-10%; The main component is composed of starch, polyvinyl alcohol and sodium carboxymethyl cellulose with the weight ratio of 25-75:75-25:3-7.
  2. 2. The starch-based adhesive for paper tape according to claim 1, wherein the starch is at least one selected from tapioca starch, waxy tapioca starch, corn starch, potato starch, and high-straight tapioca starch.
  3. 3. The starch-based adhesive for paper tape according to claim 1, wherein the polyvinyl alcohol is one of PVA1799, PVA1797, PVA2488 or PVA 1788.
  4. 4. A method for preparing a starch-based adhesive for a paper tape according to any one of claims 1 to 3, comprising the steps of: (1) Mixing starch with water, heating, stirring and gelatinizing to obtain uniform starch paste; (2) Mixing polyvinyl alcohol with water, heating, stirring and dissolving to obtain a polyvinyl alcohol solution; (3) Mixing sodium carboxymethylcellulose with water, heating, stirring and dissolving to obtain sodium carboxymethylcellulose solution; (4) Adding the polyvinyl alcohol solution into the starch paste, uniformly stirring at 70-80 ℃, then adding the sodium carboxymethyl cellulose solution, and stirring to fully disperse sodium carboxymethyl cellulose and form a thickening system; (5) And regulating the pH value of the thickening system to be neutral, adding the rest water, uniformly stirring, and cooling to room temperature to obtain the starch-based adhesive.
  5. 5. The method according to claim 4, wherein the heating temperature in the steps (1) to (3) is 90 to 95 ℃.
  6. 6. The method of claim 4, wherein the gelatinization time in step (1) is 20 to 30 minutes, the dissolution time in step (2) is 40 to 50 minutes, and the dissolution time in step (3) is 10 to 20 minutes.
  7. 7. The use of a starch-based adhesive for paper tape according to any one of claims 1 to 3, wherein the starch-based adhesive is coated on kraft paper surface and dried to produce a wet paper tape.
  8. 8. The use according to claim 7, wherein the starch-based adhesive has a coating weight of 10-30 g/m 2 .

Description

Starch-based adhesive for paper tape, and preparation method and application thereof Technical Field The invention provides a starch-based adhesive for a paper tape, and a preparation method and application thereof, and belongs to the technical field of adhesives. Background The conventional petroleum-based adhesive has a plurality of defects in the practical application process, for example, petroleum is used as a raw material, and the petroleum has nonrenewability, so that the development of the petroleum-based adhesive is limited to a certain extent. Meanwhile, the traditional petroleum-based adhesive has non-circularity, cannot be recycled, and is extremely easy to pollute the environment. The existing wet type paper adhesive tape mostly adopts starch-based adhesives. The starch has the advantages of abundant reserves, low price, biodegradability and reproducibility, and the adhesive prepared by taking the starch as a raw material is nontoxic and free from formaldehyde release, and has wide application prospect in the field of packaging. The application of the starch adhesive in the wet paper adhesive tape also faces a plurality of challenges, namely, on one hand, the adhesive layer needs to be dry and non-sticky in order to ensure that the adhesive is not adhered during dry storage, and on the other hand, the adhesive layer needs to be wet and high in initial adhesion in order to ensure that the adhesive can be adhered quickly after wet water. Conventional starch adhesives often have difficulty in achieving either dry, tacky results in difficult storage or slow or inadequate adhesive activation after wetting. An environment-friendly coating adhesive and a preparation method thereof are disclosed in Chinese patent CN201810863542. X. The environment-friendly coating adhesive is prepared from 30-60% by mass of starch emulsion, a plasticizer, 20-30% by mass of PVA solution, a cross-linking agent, an initiator and a modified monomer. The formula in the technology has a plurality of components, and relates to starch, PVA, two modified monomers, a cross-linking agent, an initiator, a plasticizer and the like, and the raw material management and the quality control are complex. Meanwhile, the preparation process is multi-step chemical synthesis (plasticization, crosslinking and graft copolymerization), the reaction conditions are required to be accurate (temperature, dripping time and pH), the energy consumption is high, the production period is long, and the requirements on equipment and a control system are higher. Therefore, developing a starch-based adhesive that can achieve both dry sleep (non-blocking) and wet rapid activation (high tack) is a hotspot in current industry research. Disclosure of Invention Based on the above, the invention provides a starch-based adhesive for a paper tape, and a preparation method and application thereof. According to the invention, starch, polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) form a blending system, and hydrogen bonds and chains among three components are intertwined to form a physical cross-linked network, so that the prepared starch-based adhesive can realize dry dormancy (non-adhesion) and wet rapid activation (high initial adhesion) at the same time. The invention is realized by adopting the following technical scheme: the starch-based adhesive for the paper tape comprises a main component and water, wherein the mass percentage of the main component is 5-10%; The main component is composed of starch, polyvinyl alcohol and sodium carboxymethyl cellulose with the weight ratio of 25-75:75-25:3-7. Preferably, the starch is at least one selected from tapioca starch, waxy tapioca starch, corn starch, potato starch and high-straight tapioca starch. Preferably, the polyvinyl alcohol is one of PVA1799, PVA1797, PVA2488 or PVA 1788. The invention also provides a preparation method of the starch-based adhesive for the paper tape, which comprises the following steps: (1) Mixing starch with water, heating, stirring and gelatinizing to obtain uniform starch paste; (2) Mixing polyvinyl alcohol with water, heating, stirring and dissolving to obtain a polyvinyl alcohol solution; (3) Mixing sodium carboxymethylcellulose with water, heating, stirring and dissolving to obtain sodium carboxymethylcellulose solution; (4) Adding the polyvinyl alcohol solution into the starch paste, uniformly stirring at 70-80 ℃, then adding the sodium carboxymethyl cellulose solution, and stirring to fully disperse sodium carboxymethyl cellulose and form a thickening system; (5) And regulating the pH value of the thickening system to be neutral, adding the rest water, uniformly stirring, and cooling to room temperature to obtain the starch-based adhesive. Preferably, the heating temperature of the step (1) to the step (3) is 90 ℃ to 95 ℃. Preferably, the gelatinization time of the step (1) is 20-30 minutes, the dissolution time of the step (2) is 40-50 minutes, and the dissolution time