CN110724466A

CN110724466A - Preparation process of cotton paper double-sided adhesive tape

Info

Publication number: CN110724466A
Application number: CN201911089731.7A
Authority: CN
Inventors: 邹继雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-01-24

Abstract

The invention discloses a preparation process of a cotton paper double-sided tape, which comprises the following steps: cutting the modified cotton paper into required size to be used as a base material, coating adhesive on the surfaces of two sides of the base material of the adhesive tape to form a double-sided adhesive layer, adhering release paper on the adhesive layer to form a release paper layer, and rolling to prepare the cotton paper double-sided adhesive tape. The modified cotton paper is used as the base material of the double-sided adhesive tape, so that the defect of poor mechanical property of the traditional cotton paper can be overcome, the high-hydrophobicity double-sided adhesive tape has high hydrophobicity and good biodegradability, and the effects of high mechanical property and hydrophobicity are realized on the basis of meeting the environment-friendly requirement; meanwhile, the soybean protein adhesive is adopted, so that the adhesive has strong adhesive property, and can be stably attached to the surface of the modified cotton paper, so that the adhesive property is improved; the obtained cotton paper double-sided adhesive tape is environment-friendly, good in mechanical property, strong in hydrophobic property and high in adhesive property, and has a wide application prospect.

Description

Preparation process of cotton paper double-sided adhesive tape

Technical Field

The invention belongs to the technical field of double-sided tapes, and particularly relates to a preparation process of a cotton paper double-sided tape.

Background

The double-sided adhesive tape is a roll-shaped adhesive tape which is prepared by uniformly coating an elastic pressure-sensitive adhesive or a resin pressure-sensitive adhesive on a base material, wherein the double-sided adhesive tape is one of the common adhesive tapes, and consists of the base material, an adhesive, release paper (film) or silicone oil paper. In order to meet the environmental requirements, the cotton paper double-sided adhesive tape is widely applied.

The cotton paper double faced adhesive tape adopts cotton paper as a base material, the cotton paper is paper made of tree bast fiber, and the base material of the double faced adhesive tape can be naturally degraded without polluting the environment, and pollutants can not be generated in the preparation process, so that the double faced adhesive tape meets the requirement of environmental protection. Chinese patent CN201410155342.0 discloses a two-sided tape of cotton paper, comprising: the transparent cotton paper tape is formed by pressing a nano fiber film and cotton paper fibers, the upper surface and the lower surface of the transparent cotton paper tape are respectively coated with viscose, the viscose is adhered with the isolating paper, and the isolating paper and the cut-off operation are conveniently uncovered through the arrangement of the triangular nodes and the aluminum foil strips. However, the cotton paper double faced adhesive tape adopts common cotton paper and adhesive, and has the defects that the mechanical property and the hydrophobic property of the cotton paper cannot meet the requirements, the adhesive property is not enough, and the double faced adhesive tape is easy to damage due to the insufficient strength of the double faced adhesive tape.

Disclosure of Invention

The invention aims to provide a preparation process of a cotton paper double-sided tape, which adopts modified cotton paper as a base material of the double-sided tape, not only can overcome the defect of poor mechanical property of the traditional cotton paper, but also has stronger hydrophobic property and better biodegradability, and realizes the effects of high mechanical property and hydrophobic property on the basis of meeting the requirement of environmental protection; meanwhile, the soybean protein adhesive is adopted, so that the adhesive has strong adhesive property, and can be stably attached to the surface of the modified cotton paper, so that the adhesive property is improved; the obtained cotton paper double-sided adhesive tape is environment-friendly, good in mechanical property, strong in hydrophobic property and high in adhesive property, and has a wide application prospect.

The purpose of the invention can be realized by the following technical scheme:

a preparation process of a cotton paper double-sided tape comprises a base material, wherein two surfaces of the base material are coated with adhesives to form adhesive layers, and release paper is adhered to the other side of each adhesive layer to form a release paper layer;

the preparation process of the tissue paper double-sided adhesive tape comprises the following steps:

cutting the modified cotton paper into required size to be used as a base material, coating adhesive on the surfaces of two sides of the base material of the adhesive tape to form a double-sided adhesive layer, adhering release paper on the adhesive layer to form a release paper layer, and rolling to prepare the cotton paper double-sided adhesive tape;

the base material adopts modified cotton paper, and the modified cotton paper is prepared by the following method:

s1, adding 0.5g of bamboo fiber into 100mL of ethanol, adding 0.5-0.6g of sodium hydroxide under the condition of slow stirring, then placing the mixture into a constant-temperature water bath kettle at 60 ℃ for stirring, dropwise adding 0.5-0.6mL of 2, 3-epoxypropyltrimethylammonium chloride, reacting for 2 hours, and repeatedly washing a product to be neutral to obtain modified bamboo fiber;

s2, adding 500mL of dimethyl sulfoxide, 1g of aramid fiber and 1.5g of sodium hydroxide into a beaker, magnetically stirring for 5-6d at room temperature to obtain an aramid nanofiber suspension, washing with acetone for 5-7 times, separating, and vacuum-drying at room temperature to obtain aramid nanofiber powder;

s3, adding aramid nano fiber powder into distilled water to prepare a suspension liquid with the mass fraction of 0.2%, immersing the modified bamboo fiber into the prepared suspension liquid, ultrasonically dispersing for 30-40min, washing for 5-6 times by using deionized water, and drying for 12h in a room-temperature vacuum drying oven to obtain modified fiber;

s4, mixing the modified fibers and the wood pulp according to the mass ratio of 1:10-12, and performing suction filtration to obtain the modified cotton paper.

Further, the solid content of the wood pulp in the step S4 is 20% to 24%.

Further, the adhesive is prepared by the following method:

1) adding 200g of water into a round-bottom three-neck flask, adding 62.5g of soybean protein powder under the condition of normal-temperature stirring, heating to 65 ℃, adding 21.5g of NaOH aqueous solution with the mass fraction of 20%, reacting for 30-40min, adding 16.5g of urea aqueous solution with the mass fraction of 30%, and cooling to room temperature to obtain a protein pretreatment solution;

2) adding glyoxal into a round-bottom three-neck flask, adjusting the pH value to 4-4.5, stirring and heating to 70 ℃, gradually adding an ethanol solution of p-phenylenediamine with the mass fraction of 40%, keeping the temperature for reaction for 90min, and cooling to room temperature to obtain a cross-linking agent;

3) uniformly mixing the protein pretreatment solution and a cross-linking agent according to the mass ratio of 50:1 to obtain an adhesive;

further, the ratio of the amount of the materials of glyoxal and p-phenylenediamine in the step 2) is 3: 6:1.

The invention has the beneficial effects that:

the modified cotton paper is used as a base material of the double-sided tape, the bamboo fiber is subjected to surface modification and then mixed with wood pulp to prepare the modified cotton paper, the surface of the bamboo fiber is rich in hydroxyl, and under an alkaline condition, the hydroxyl on the surface of the bamboo fiber and an epoxy group on 2, 3-epoxypropyltrimethylammonium chloride undergo a ring-opening substitution reaction to graft the 2, 3-epoxypropyltrimethylammonium chloride on the bamboo fiber, so that the modified bamboo fiber is obtained; 2, 3-epoxypropyl trimethyl ammonium chloride has cationization effect, so that the surface of the modified bamboo fiber has positive charges; the aramid fiber is stirred under dimethyl sulfoxide and an alkaline condition and can be cracked, the dimethyl sulfoxide can damage a molecular chain of the aramid fiber, so that the regularity of the aramid fiber is reduced and the size of the molecular chain is reduced, and the aramid nanofiber (nano dispersion of the aramid fiber) is formed; the coated bamboo fiber has aramid fiber (the characteristics of ultrahigh strength and high modulus), and the cotton paper prepared by mixing the aramid fiber with wood pulp fiber can overcome the defect of poor mechanical property of the traditional cotton paper, has stronger hydrophobic property and better biodegradability, and realizes the effects of high mechanical property and hydrophobic property on the basis of meeting the environmental protection requirement;

according to the invention, the adhesive is prepared from the soybean protein, and after alkali treatment, the NaOH can degrade the soybean protein, so that more active groups are exposed out of the protein, the soybean protein can be fused with the cross-linking agent in two phases more thoroughly, the degree of cross-linking reaction is improved, and the adhesive force is further improved; under acidic conditions, glyoxal will be protonated, amino (-NH) groups on p-phenylenediamine₂) Reacting with aldehyde group of glyoxal to generate NH-CH-OH, wherein the generated-NH-CH-OH has better affinity with active groups such as amino groups of protein; after the reaction, carbon in the cross-linking agent almost exists in the form of methylene carbon, and the branched chains participating in the cross-linking reaction are many, so that the adhesive bonding performance of the protein adhesive can be further improved, and the cross-linking agent contains active functional group hydroxymethyl, can perform cross-linking reaction with protein molecules, improves the cross-linking density of a system, can enhance the adhesive bonding performance, and can improve the water resistance of the adhesive through a compact cross-linking network; active functional groups (hydroxyl and amino) in the adhesive can form chemical bonds with hydroxyl and carboxyl on the surface of a base material (modified cotton paper), so that the adhesive can be firmly attached to the surface of the cotton paper, and higher bonding performance is caused; the active hydroxyl contained in the adhesive has higher surface activity and better wetting effect on an adherend base material, so that the adhesive can be better immersed between the depressions and the gaps of the adherend base material, the bonding area with the base material is increased, and the bonding force of the adhesive is improved;

the modified cotton paper is used as the base material of the double-sided adhesive tape, so that the defect of poor mechanical property of the traditional cotton paper can be overcome, the high-hydrophobicity double-sided adhesive tape has high hydrophobicity and good biodegradability, and the effects of high mechanical property and hydrophobicity are realized on the basis of meeting the environment-friendly requirement; meanwhile, the soybean protein adhesive is adopted, so that the adhesive has strong adhesive property, and can be stably attached to the surface of the modified cotton paper, so that the adhesive property is improved; the obtained cotton paper double-sided adhesive tape is environment-friendly, good in mechanical property, strong in hydrophobic property and high in adhesive property, and has a wide application prospect.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the structure of the tissue double-sided tape of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A preparation process of a cotton paper double-sided tape comprises a base material 1, wherein two surfaces of the base material 1 are coated with adhesives to form an adhesive layer 2, and release paper 3 is adhered to the other side of the adhesive layer 2;

wherein, the base material 1 adopts modified cotton paper, and the modified cotton paper is prepared by the following method:

s3, adding aramid nano fiber powder into distilled water to prepare a suspension liquid with the mass fraction of 0.2%, immersing the modified bamboo fiber into the prepared suspension liquid, ultrasonically dispersing for 30-40min, washing with deionized water for 5-6 times, and drying in a vacuum drying oven for 12h to obtain modified fiber;

s4, mixing the modified fibers and wood pulp according to the mass ratio of 1:10-12, and performing suction filtration to obtain modified cotton paper; wherein the solid content of the wood pulp is 20-24%;

the surface of the bamboo fiber is rich in hydroxyl, and under an alkaline condition, the hydroxyl on the surface of the bamboo fiber and an epoxy group on the 2, 3-epoxypropyltrimethylammonium chloride undergo a ring-opening substitution reaction to graft the 2, 3-epoxypropyltrimethylammonium chloride on the bamboo fiber, so that the modified bamboo fiber is obtained; 2, 3-epoxypropyl trimethyl ammonium chloride has cationization effect, so that the surface of the modified bamboo fiber has positive charges; the aramid fiber is stirred under dimethyl sulfoxide and an alkaline condition and can be cracked, the dimethyl sulfoxide can damage a molecular chain of the aramid fiber, so that the regularity of the aramid fiber is reduced and the size of the molecular chain is reduced, and the aramid nanofiber (nano dispersion of the aramid fiber) is formed; the coated bamboo fiber has aramid fiber (the characteristics of ultrahigh strength and high modulus), and the cotton paper prepared by mixing the aramid fiber with wood pulp fiber can overcome the defect of poor mechanical property of the traditional cotton paper, has stronger hydrophobic property and better biodegradability, and realizes the effects of high mechanical property and hydrophobic property on the basis of meeting the environmental protection requirement;

the adhesive is prepared by the following method:

2) adding glyoxal into a round-bottom three-neck flask, adjusting the pH value to 4-4.5, stirring and heating to 70 ℃, gradually adding 40% by mass of p-phenylenediamine ethanol solution, keeping the temperature for reaction for 90min, and cooling to room temperature to obtain a cross-linking agent, wherein the mass ratio of glyoxal to p-phenylenediamine is 3:6: 1;

the main components of the soybean comprise protein, polysaccharide and crude fat, and the crude fat is distributed at the periphery of the soybean protein to influence the solubility and the alkali degradation efficiency of the protein, so that the soybean protein which is not subjected to alkali treatment and a cross-linking agent are separated, and the cross-linking reaction is hindered; after alkali treatment, the NaOH can degrade the soybean protein, so that more active groups are exposed out of the protein, the soybean protein can be fused with the cross-linking agent in a two-phase manner more thoroughly, the degree of cross-linking reaction is improved, and the binding power is further improved; proper amount of NaOH is adopted for proper time treatment (the NaOH content is 6-7% of the protein powder content, and the treatment lasts for 30-40min), so that not only can the effective exposure of protein active groups be ensured, but also the treated protein has better fluidity and the main structure of protein polymers is not excessively damaged, namely, the protein has higher cohesive strength and good sizing operation performance;

under acidic conditions, glyoxal will be protonated, amino (-NH) groups on p-phenylenediamine₂) Reacting with aldehyde group of glyoxal to generate NH-CH-OH, wherein the generated-NH-CH-OH has better affinity with active groups such as amino groups of protein; after the reaction, carbon in the cross-linking agent almost exists in the form of methylene carbon, and the branched chains participating in the cross-linking reaction are many, so that the adhesive bonding performance of the protein adhesive can be further improved, and the cross-linking agent contains active functional group hydroxymethyl, can perform cross-linking reaction with protein molecules, improves the cross-linking density of a system, can enhance the adhesive bonding performance, and can improve the water resistance of the adhesive through a compact cross-linking network;

active functional groups (hydroxyl and amino) in the adhesive can form chemical bonds with hydroxyl and carboxyl on the surface of a base material (modified cotton paper), so that the adhesive can be firmly attached to the surface of the cotton paper, and higher bonding performance is caused; the active hydroxyl contained in the adhesive has higher surface activity and better wetting effect on an adherend base material, so that the adhesive can be better immersed between the depressions and the gaps of the adherend base material, the bonding area with the base material is increased, and the bonding force of the adhesive is improved;

cutting the modified cotton paper into required size to be used as a base material 1, coating adhesive on the surfaces of two sides of the base material of the adhesive tape to form a double-sided adhesive layer 2, adhering the release paper on the adhesive layer 2, and rolling to prepare the cotton paper double-sided adhesive tape.

Example 1

The modified tissue paper is prepared by the following method:

s1, adding 0.5g of bamboo fiber into 100mL of ethanol, adding 0.5g of sodium hydroxide under the condition of slow stirring, then placing the mixture into a constant-temperature water bath kettle at 60 ℃ for stirring, dropwise adding 0.5mL of 2, 3-epoxypropyltrimethylammonium chloride, reacting for 2 hours, and repeatedly washing the product to be neutral to obtain modified bamboo fiber;

s2, adding 500mL of dimethyl sulfoxide, 1g of aramid fiber and 1.5g of sodium hydroxide into a beaker, magnetically stirring for 5 days at room temperature to obtain an aramid nanofiber suspension, cleaning with acetone for 5 times, separating, and vacuum-drying at room temperature to obtain aramid nanofiber powder;

s3, adding aramid nano fiber powder into distilled water to prepare a suspension liquid with the mass fraction of 0.2%, immersing the modified bamboo fiber into the prepared suspension liquid, ultrasonically dispersing for 30min, washing for 5 times by using deionized water, and drying for 12h in a vacuum drying oven to obtain modified fiber;

s4, mixing the modified fibers and wood pulp according to the mass ratio of 1:10, and performing suction filtration to obtain modified cotton paper; wherein the solid content of the wood pulp is 20%.

Example 2

The modified tissue paper is prepared by the following method:

s1, adding 0.5g of bamboo fiber into 100mL of ethanol, adding 0.6g of sodium hydroxide under the condition of slow stirring, then placing the mixture into a constant-temperature water bath kettle at 60 ℃ for stirring, dropwise adding 0.6mL of 2, 3-epoxypropyltrimethylammonium chloride, reacting for 2 hours, and repeatedly washing the product to be neutral to obtain modified bamboo fiber;

s2, adding 500mL of dimethyl sulfoxide, 1g of aramid fiber and 1.5g of sodium hydroxide into a beaker, magnetically stirring for 6d at room temperature to obtain an aramid nanofiber suspension, cleaning with acetone for 7 times, separating, and vacuum-drying at room temperature to obtain aramid nanofiber powder;

s3, adding aramid nano fiber powder into distilled water to prepare a suspension liquid with the mass fraction of 0.2%, immersing the modified bamboo fiber into the prepared suspension liquid, ultrasonically dispersing for 40min, washing for 6 times by using deionized water, and drying for 12h in a vacuum drying oven to obtain modified fiber;

s4, mixing the modified fibers and wood pulp according to the mass ratio of 1:12, and performing suction filtration to obtain modified cotton paper; wherein the solid content of the wood pulp is 24 percent.

Comparative example 1

Ordinary tissue paper.

The following performance tests were performed on the tissues obtained in examples 1-2 and comparative example 1:

testing the hydrophilic angle by a dynamic absorption contact angle tester; the base paper was tested for elongation and the results are given in table 1 below:

TABLE 1

	Example 1	Example 2	Comparative example 1
				Water contact angle/° c	112.5	110.8	86.5
Maximum tensile strength/MPa	6.9	7.0	4.6

As can be seen from Table 1, the modified tissue paper prepared in the examples 1-2 has a water contact angle of 110.8-112.5 degrees and a maximum tensile strength of 6.9-7.0MPa, and the modified tissue paper prepared in the invention not only can overcome the defect of poor mechanical properties of the traditional tissue paper, but also has strong hydrophobic properties, and realizes the effects of high mechanical properties and hydrophobic properties on the basis of meeting the environmental protection requirements, as shown in the comparative example 1.

Example 3

The adhesive is prepared by the following method:

1) adding 200g of water into a round-bottom three-neck flask, adding 62.5g of soybean protein powder under the condition of normal-temperature stirring, heating to 65 ℃, adding 21.5g of a 20% NaOH aqueous solution, reacting for 30min, adding 16.5g of a 30% urea aqueous solution, and cooling to room temperature to obtain a protein pretreatment solution;

2) adding glyoxal into a round-bottom three-neck flask, adjusting the pH value to 4, stirring and heating to 70 ℃, gradually adding 40% by mass of p-phenylenediamine ethanol solution, keeping the temperature for reaction for 90min, and cooling to room temperature to obtain a cross-linking agent, wherein the mass ratio of the glyoxal to the p-phenylenediamine is 3:6: 1;

3) and uniformly mixing the protein pretreatment solution and the cross-linking agent according to the mass ratio of 50:1 to obtain the adhesive.

Example 4

The adhesive is prepared by the following method:

1) adding 200g of water into a round-bottom three-neck flask, adding 62.5g of soybean protein powder under the condition of normal-temperature stirring, heating to 65 ℃, adding 21.5g of a 20% NaOH aqueous solution, reacting for 40min, adding 16.5g of a 30% urea aqueous solution, and cooling to room temperature to obtain a protein pretreatment solution;

2) adding glyoxal into a round-bottom three-neck flask, adjusting the pH value to 4.5, stirring and heating to 70 ℃, gradually adding 40% by mass of p-phenylenediamine ethanol solution, keeping the temperature for reaction for 90min, and cooling to room temperature to obtain the cross-linking agent, wherein the mass ratio of glyoxal to p-phenylenediamine is 3:6: 1;

Comparative example 2

The adhesive is used for common double-sided adhesive tapes.

The adhesives prepared in examples 3-4 and comparative example 2 were tested for the following properties: the glue adhesive is coated between two wood boards, and the glue bonding strength is tested according to GB/T9846.7-2013; coating the adhesive on a wood board, and testing the water contact angle after the adhesive is dried, wherein the test results are shown in the following table 2:

TABLE 2

It can be seen that the dry strength of the adhesive prepared in examples 3-4 is 1.69-1.72MPa, the strength of warm water is 0.98-0.99MPa, and the strength of boiling water still can reach 0.84-0.85MPa, which indicates that the adhesive prepared in the invention has high bonding strength, and the water contact angle of the adhesive prepared in examples 3-4 is 108.5-109.6 degrees, compared with comparative example 2, which indicates that the adhesive prepared in the invention has high hydrophobic property and water resistance.

Example 5

The tissue paper double-sided adhesive tape is prepared by the following steps:

cutting the modified cotton paper prepared in the embodiment 1 into a required size to be used as a base material 1, coating the adhesive prepared in the embodiment 3 on the two side surfaces of the base material of the adhesive tape to form a double-sided adhesive layer 2, adhering the release paper on the adhesive layer 2, and rolling to prepare the double-sided adhesive tape of the cotton paper.

Example 6

The tissue paper double-sided adhesive tape is prepared by the following steps:

cutting the modified cotton paper prepared in the embodiment 2 into a required size to be used as a base material 1, coating the adhesive prepared in the embodiment 4 on the two side surfaces of the base material of the adhesive tape to form a double-sided adhesive layer 2, adhering the release paper on the adhesive layer 2, and rolling to prepare the cotton paper double-sided adhesive tape.

Comparative example 3

Cutting the modified cotton paper of the comparative example 1 into a required size to serve as a base material 1, coating the adhesive of the comparative example 2 on the surfaces of two sides of the base material of the adhesive tape to form a double-sided adhesive layer 2, adhering the release paper on the adhesive layer 2, and rolling to prepare the cotton paper double-sided adhesive tape.

The following performance tests were performed for examples 5-6 and comparative example 3: measurement Using CZY-G initial tack tester

Initial stickiness of the tape; testing the tensile strength and the elongation at break of the adhesive tape according to the test method of GB/T7753-1987; testing the peeling strength according to the test method of GB/T2792-2014; the test results are given in table 3 below:

TABLE 3

It can be seen that the initial viscosity of the adhesive tapes prepared in examples 5-6 is 8# steel ball, which indicates that the adhesive tapes prepared by the invention have good initial viscosity; the tensile strength of the adhesive tapes obtained in examples 5 to 6 was 64.8 to 63.5 N.cm^-1The elongation at break is 121.7-122.4%, which shows that the adhesive tape prepared by the invention has high mechanical property; the 180 DEG peel strength of the adhesive tapes obtained in examples 5 to 6 was 6.5 to 6.6N cm^-1And has high peel strength.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A preparation process of a cotton paper double-sided tape is characterized by comprising a base material (1), wherein two surfaces of the base material (1) are coated with adhesives to form an adhesive layer (2), and release paper is adhered to the other side of the adhesive layer (2) to form a release paper layer (3);

cutting the modified cotton paper into required size to be used as a base material (1), coating adhesive on the surfaces of two sides of the base material of the adhesive tape to form a double-sided adhesive layer (2), adhering release paper on the adhesive layer (2) to form a release paper layer (3), and rolling to prepare the cotton paper double-sided adhesive tape;

wherein, the base material (1) adopts modified cotton paper, and the modified cotton paper is prepared by the following method:

2. The process for preparing double-sided tape of tissue paper as claimed in claim 1, wherein the solid content of wood pulp in step S4 is 20-24%.

3. The process for preparing tissue paper double-sided tape according to claim 1, wherein the adhesive is prepared by the following method:

4. The process for preparing double-sided tape for tissue paper as claimed in claim 3, wherein the ratio of the amount of glyoxal to the amount of p-phenylenediamine in step 2) is 3:6: 1.