A scented paper sheet and its preparation method

Abstract

This invention discloses an aromatherapy paper sheet and its preparation method, belonging to the field of paper processing technology. The preparation method of the aromatherapy layer includes the following steps: mixing cyclodextrin, coordinating metal ions, and deionized water, filtering, collecting the filtrate, mixing with methanol, sealing and heat-treating, adding 8-hydroxyquinoline aluminum and hexadecyltrimethylammonium bromide to prepare a carrier; mixing the carrier, citric acid, potassium dihydrogen phosphate, and anhydrous ethanol, ultrasonically dispersing, heating and stirring in a water bath, and heat-treating to prepare a crosslinking carrier; loading functional essential oils onto the crosslinking carrier, dispersing, and preparing an essential oil inclusion complex; mixing cottonseed lint and starch glue, stirring in a water bath, adding the essential oil inclusion complex and continuing stirring, and solidifying the stirred mixture to obtain the aromatherapy layer; by coating the functional essential oils, the permeability of the resulting aromatherapy paper sheet is prevented from penetrating to the adhesive paper layer, thus improving the anti-permeability effect of the prepared aromatherapy paper sheet.

Description

Technical Field

[0001] This invention belongs to the field of paper processing technology, specifically relating to an aromatherapy paper and its preparation method. Background Technology

[0002] Scented diffuser sheets are layered items that release fragrance. Their uses are highly versatile, allowing for various applications depending on individual needs and the occasion. For example, placing them in a car's air conditioning vents can effectively purify the air inside the car when the air conditioning is on, providing a comfortable driving experience. They can also be placed on workbenches, desks, or in living rooms to improve the air quality, boosting work efficiency or adding comfort to the home. When outdoors, they can be carried in pockets or bags to enjoy a refreshing scent anytime, anywhere. Placing them next to your pillow before bed can aid sleep. In wardrobes, they can prevent dust mites and unpleasant odors from growing on clothes, keeping them fresh. The different effects of scented diffuser sheets depend on the composition of the fragrance ingredients within them.

[0003] A search revealed a patent application (CN202120894973.X) disclosing a scented paper sheet. The scented layer is located between a first paper layer and a second paper layer, forming a sandwich structure. The first and second paper layers have ventilation holes, allowing the fragrance to diffuse outwards and impart a pleasant aroma to the paper. Traditional processing of scented paper sheets often uses double-sided offset paper for the first and second layers. This allows for more printing processes or finishing techniques on the offset paper surface, resulting in more diverse effects and applications on different products. The scented layer is often made by dripping or soaking absorbent paper with fragrance, but this leaves fragrance residue on the surface. This residue seeps through the ventilation holes to the first and second paper layers, causing an oily surface that easily gets on the user's hands, affecting the product experience. If the layers are glued together before soaking or dripping fragrance, the adhesion between the layers is poor, leading to easy delamination. Therefore, effectively improving the penetration and stability of essential oils in aromatherapy sheets has become the key to enhancing product quality and user experience. Summary of the Invention

[0004] The purpose of this invention is to provide an aromatherapy paper and its preparation method, which solves the problem of essential oil penetration in aromatherapy paper, which damages the stability of the aromatherapy paper layer structure.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for preparing aromatherapy paper sheets involves taking a first double-sided adhesive paper layer, an aromatherapy layer, and a second double-sided adhesive paper layer, stacking them sequentially, pressing and curing them, and cutting them to obtain the aromatherapy paper sheets.

[0007] The method for preparing the aromatherapy layer includes the following steps:

[0008] S1. Take cyclodextrin, coordinating metal ions and deionized water, mix them, filter and collect the filtrate;

[0009] S2. Take the filtrate and methanol, mix them, seal and heat treat them, add 8-hydroxyquinoline aluminum and hexadecyltrimethylammonium bromide, stir evenly, place at room temperature, centrifuge, take the solid phase, wash it, and vacuum dry it to obtain the carrier.

[0010] S3. Take the carrier, citric acid, potassium dihydrogen phosphate and anhydrous ethanol, mix them, disperse them by ultrasonication, heat and stir in a water bath, then heat at 135-145℃ for 4-6 hours, cool, take the product, wash it, and vacuum dry it to obtain the crosslinked carrier.

[0011] S4. Take the crosslinking carrier and anhydrous ethanol, mix them, add functional essential oil, disperse the mixture, centrifuge, and take the solid phase to obtain the essential oil inclusion complex.

[0012] S5. Take cottonseed lint and starch glue, mix them, stir in a water bath, add the essential oil inclusion complex and continue stirring, and solidify the mixture to obtain the aromatherapy layer.

[0013] As a preferred embodiment of the present invention, in step S1, the molar ratio of the cyclodextrin to the coordinating metal ions is 1-2:10-12.

[0014] As a preferred embodiment of the present invention, in step S2, the ratio of the filtrate, methanol, 8-hydroxyquinoline aluminum, and hexadecyltrimethylammonium bromide is 40-60 mL: 80 mL: 0.8-1.2 mg: 0.2-0.3 mg.

[0015] As a preferred embodiment of the present invention, in step S3, the ratio of the carrier, citric acid, potassium dihydrogen phosphate, and anhydrous ethanol is 15-18 mg: 15-18 mg: 0.7-0.9 mg: 50-60 mL.

[0016] As a preferred embodiment of the present invention, in step S4, the ratio of the crosslinking carrier, anhydrous ethanol, and functional essential oil is 3-4 mg: 20 mL: 2-2.5 mL.

[0017] As a preferred embodiment of the present invention, in step S5, the ratio of the cottonseed lint, starch gum, and essential oil inclusion complex is 1-2 mg: 20-30 mL: 2.5-3.5 mg.

[0018] As a preferred embodiment of the present invention, the coordinating metal ion includes any one of sodium ion, potassium ion or ferrous ion.

[0019] In a preferred embodiment of the present invention, the coordinating metal ion is preferably a sodium ion.

[0020] As a preferred embodiment of the present invention, the functional essential oil includes any one or a combination of at least two of the following: lavender essential oil, lemon essential oil, sweet orange essential oil, jasmine essential oil, chamomile essential oil, tea tree essential oil, eucalyptus essential oil, rosemary essential oil, and rose essential oil.

[0021] As a preferred embodiment of the present invention, the cyclodextrin includes any one of α-cyclodextrin, β-cyclodextrin, or γ-cyclodextrin.

[0022] As a preferred embodiment of the present invention, the cyclodextrin is preferably γ-cyclodextrin.

[0023] Aromatherapy paper sheets prepared using the preparation method described above.

[0024] The beneficial effects of this invention are:

[0025] The aromatherapy paper and its preparation method disclosed in this invention involve preparing a cyclodextrin organic framework, then introducing cross-linking sites, and further performing cross-linking and sealing treatment to obtain a cross-linked carrier with a porous structure to encapsulate functional essential oils. On the one hand, this extends the penetration path of the essential oils, prevents the essential oils from penetrating to the surface of the paper and contaminating the paper, prevents the separation of the paper layer structure caused by oil seepage, and improves structural stability. On the other hand, by encapsulating the essential oils, a slow-release effect is achieved, improving the fragrance persistence of the aromatherapy paper.

[0026] Furthermore, by adding cottonseed lint to the starch adhesive and blending it with the essential oil inclusion complex, when the essential oil permeates, the abundant short fibers on the surface of the cottonseed lint have a physical adsorption effect on the essential oil, and quickly absorb the exudate through capillary action, further preventing the essential oil from penetrating to the surface of the paper and forming oil spots; moreover, after the cottonseed lint adsorbs the essential oil, this adsorption effect can temporarily fix the essential oil, achieve a slow release effect, and improve the fragrance persistence of the aromatherapy paper. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 The aromatherapy paper sheet and its preparation method proposed in this invention are used to produce the aromatherapy paper sheet. 对比例1 Scented paper 对比例2 Gas chromatogram of surface-penetrating essential oils. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0030] This application provides an aromatherapy paper sheet, which is prepared by taking double-sided coated paper as the bottom layer, spreading aromatherapy adhesive on it, then attaching double-sided coated paper to the aromatherapy adhesive, pressing and curing it, and trimming the edges to obtain the aromatherapy paper sheet; wherein, the bottom double-sided coated paper serves as the second double-sided coated paper layer, on which aromatherapy adhesive is spread, and then double-sided coated paper is attached as the first double-sided coated paper layer, and the aromatherapy adhesive, after curing, serves as the aromatherapy layer; the thickness of the aromatherapy adhesive coating is 50-100μm.

[0031] The curing method can be natural curing for 6-8 hours or drying at 40℃ for 30-40 minutes. The pressure during pressing is 0.6-1 MPa.

[0032] Example 1

[0033] A method for preparing an aromatherapy gel includes the following steps:

[0034] S1. Take 12.91 mg of γ-cyclodextrin, 32.44 mg of potassium citrate, and 150 mL of deionized water, mix them, sonicate for 10 min, filter, and collect the filtrate.

[0035] S2. Take 40 mL of filtrate and 80 mL of methanol, mix them, place them in a sealed container and heat them in a water bath at 45 °C for 3 h, add 0.8 mg of 8-hydroxyquinoline aluminum and 0.2 mg of hexadecyltrimethylammonium bromide, stir for 5 h, let stand at room temperature for 12 h, centrifuge, take the solid phase, wash it, and vacuum dry it to obtain the carrier.

[0036] S3. Take 15mg of carrier, 15mg of citric acid, 0.7mg of potassium dihydrogen phosphate and 50mL of anhydrous ethanol, mix them, sonicate for 10min, heat and stir in a water bath at 70℃ for 4h, then heat at 135℃ for 4h, cool, take the product, wash and vacuum dry to obtain the crosslinked carrier.

[0037] S4. Take 3 mg of crosslinking carrier and 20 mL of anhydrous ethanol, mix and stir for 5 min, add 2 mL of lavender essential oil (purchased from Hubei Zhonglong Kangcheng Fine Chemical Co., Ltd.), sonicate at 60℃ for 8 min, centrifuge and separate, and take the solid phase to obtain the essential oil inclusion complex.

[0038] S5. Take 1mg of cottonseed lint and 20mL of starch colloid, mix them, stir at 45℃ for 15min, add 2.5mg of essential oil inclusion complex and continue stirring for 3min to obtain the aromatherapy colloid.

[0039] The method for preparing the starch gel includes the following steps:

[0040] Take 50g of oxidized corn starch (purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd.), 150mL of deionized water, 10mL of glycerol, and 1.5g of stearic acid and mix them together. Stir at 65℃ for 30min, cool to 45℃, add 200mL of 5% sodium alginate aqueous solution, and continue stirring for 20min to obtain the starch gel.

[0041] Example 2

[0042] A method for preparing an aromatherapy gel includes the following steps:

[0043] S1. Take 19.45 mg of γ-cyclodextrin, 35.67 mg of potassium citrate, and 180 mL of deionized water, mix them, sonicate for 10 min, filter, and collect the filtrate.

[0044] S2. Take 50 mL of filtrate and 80 mL of methanol, mix them, place them in a sealed container and heat them in a water bath at 50 °C for 5 h, add 1 mg of 8-hydroxyquinoline aluminum and 0.25 mg of cetyltrimethylammonium bromide, stir for 7 h, let stand at room temperature for 18 h, centrifuge, take the solid phase, wash it, and vacuum dry it to obtain the carrier.

[0045] S3. Mix 16 mg of carrier, 16 mg of citric acid, 0.8 mg of potassium dihydrogen phosphate and 55 mL of anhydrous ethanol, sonicate for 12 min, heat and stir in a water bath at 70 °C for 5 h, then heat at 140 °C for 5 h, cool, wash the product, and vacuum dry to obtain the crosslinked carrier.

[0046] S4. Take 3.5 mg of crosslinking carrier and 20 mL of anhydrous ethanol, mix and stir for 5 min, add 2.2 mL of eucalyptus essential oil (purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.), sonicate at 60 °C for 12 min, centrifuge and separate, and take the solid phase to obtain the essential oil inclusion complex.

[0047] S5. Take 1.5mg of cottonseed lint and 25mL of starch glue, mix them, stir at 50℃ for 20min, add 3mg of essential oil inclusion complex and continue stirring for 4min to obtain the aromatherapy glue.

[0048] The method for preparing the starch gel includes the following steps:

[0049] Take 50g of oxidized corn starch, 150mL of deionized water, 10mL of glycerol and 1.5g of stearic acid and mix them together. Stir at 65℃ for 30min, cool to 45℃, add 200mL of 5% sodium alginate aqueous solution, and continue stirring for 20min to obtain the starch gel.

[0050] Example 3

[0051] A method for preparing an aromatherapy gel includes the following steps:

[0052] S1. Take 25.94 mg of γ-cyclodextrin, 38.92 mg of potassium citrate, and 200 mL of deionized water, mix them, sonicate for 10 min, filter, and collect the filtrate.

[0053] S2. Take 60 mL of filtrate and 80 mL of methanol, mix them, place them in a sealed container and heat them in a water bath at 55 °C for 5 h, add 1.2 mg of 8-hydroxyquinoline aluminum and 0.3 mg of hexadecyltrimethylammonium bromide, stir for 8 h, let stand at room temperature for 24 h, centrifuge, take the solid phase, wash it, and dry it under vacuum to obtain the carrier.

[0054] S3. Mix 18 mg of carrier, 18 mg of citric acid, 0.9 mg of potassium dihydrogen phosphate, and 60 mL of anhydrous ethanol. Disperse the mixture by sonication for 15 min. Heat and stir in a water bath at 70 °C for 6 h. Then heat at 145 °C for 6 h. Cool the mixture, wash the product, and vacuum dry it to obtain the crosslinked carrier.

[0055] S4. Take 4 mg of crosslinking carrier and 20 mL of anhydrous ethanol, mix and stir for 5 min, add 2.5 mL of chamomile essential oil (purchased from Jiangxi Jingwang Natural Fragrance Co., Ltd.), sonicate at 60℃ for 15 min, centrifuge and separate, and take the solid phase to obtain the essential oil inclusion complex.

[0056] S5. Take 2mg of cottonseed lint and 30mL of starch glue, mix them, stir at 55℃ for 25min, add 3.5mg of essential oil inclusion complex and continue stirring for 5min to obtain the aromatherapy glue.

[0057] The method for preparing the starch gel includes the following steps:

[0058] Take 50g of oxidized corn starch, 150mL of deionized water, 10mL of glycerol and 1.5g of stearic acid and mix them together. Stir at 65℃ for 30min, cool to 45℃, add 200mL of 5% sodium alginate aqueous solution, and continue stirring for 20min to obtain the starch gel.

[0059] Example 4

[0060] A method for preparing an aromatherapy gel includes the following steps:

[0061] S1. Take 19.45 mg of β-cyclodextrin, 36.95 mg of sodium citrate, and 180 mL of deionized water, mix them, sonicate for 10 min, filter, and collect the filtrate.

[0062] S2. Take 50 mL of filtrate and 80 mL of methanol, mix them, place them in a sealed container and heat them in a water bath at 50 °C for 5 h, add 1 mg of 8-hydroxyquinoline aluminum and 0.25 mg of cetyltrimethylammonium bromide, stir for 7 h, let stand at room temperature for 18 h, centrifuge, take the solid phase, wash it, and vacuum dry it to obtain the carrier.

[0063] S3. Mix 16 mg of carrier, 16 mg of citric acid, 0.8 mg of potassium dihydrogen phosphate and 55 mL of anhydrous ethanol, sonicate for 12 min, heat and stir in a water bath at 70 °C for 5 h, then heat at 140 °C for 5 h, cool, wash the product, and vacuum dry to obtain the crosslinked carrier.

[0064] S4. Take 3.5 mg of crosslinking carrier and 20 mL of anhydrous ethanol, mix and stir for 5 min, add 1.2 mL of sweet orange essential oil (purchased from Ji'an Huatianbao Traditional Chinese Medicine Biological Products Factory) and 1 mL of jasmine essential oil (purchased from Guangdong Yunxing Biotechnology Co., Ltd.), sonicate at 60℃ for 12 min, centrifuge and separate, and take the solid phase to obtain essential oil inclusion complex.

[0065] S5. Take 1.5mg of cottonseed lint and 25mL of starch glue, mix them, stir at 50℃ for 20min, add 3mg of essential oil inclusion complex and continue stirring for 4min to obtain the aromatherapy glue.

[0066] The method for preparing the starch gel includes the following steps:

[0067] Take 50g of oxidized corn starch, 150mL of deionized water, 10mL of glycerol and 1.5g of stearic acid and mix them together. Stir at 65℃ for 30min, cool to 45℃, add 200mL of 5% sodium alginate aqueous solution, and continue stirring for 20min to obtain the starch gel.

[0068] Comparative Example 1

[0069] The difference from Example 2 is that cotton lint is not added in step S5 of the preparation process of the aromatherapy adhesive, while the other operation steps remain unchanged.

[0070] Comparative Example 2

[0071] The difference from Example 2 is that the preparation method of the aromatherapy gel includes the following steps:

[0072] Mix 1.5 mg of cottonseed lint and 25 mL of starch colloid, stir at 50 °C for 20 min, add 2.2 mL of eucalyptus oil, and continue stirring for 4 min to obtain the aromatherapy colloid.

[0073] Comparative Example 3

[0074] The difference from Example 2 is that the preparation method of the aromatherapy gel includes the following steps:

[0075] S1. Take 19.45 mg of γ-cyclodextrin, 35.67 mg of potassium citrate, and 180 mL of deionized water, mix them, sonicate for 10 min, filter, and collect the filtrate.

[0076] S2. Take 50 mL of filtrate and 80 mL of methanol, place them in a sealed container and heat in a water bath at 50 °C for 5 h, add 0.25 mg of cetyltrimethylammonium bromide, stir for 7 h, let stand at room temperature for 18 h, centrifuge, take the solid phase, wash, and vacuum dry to obtain the carrier.

[0077] S3. Take 3.5 mg of carrier and 20 mL of anhydrous ethanol, mix and stir for 5 min, add 2.2 mL of eucalyptus essential oil, sonicate at 60 °C for 12 min, centrifuge and separate, and take the solid phase to obtain the essential oil inclusion complex.

[0078] S4. Take 1.5mg of cottonseed lint and 25mL of starch glue, mix them, stir at 50℃ for 20min, add 3mg of essential oil inclusion complex and continue stirring for 4min to obtain the aromatherapy glue.

[0079] Performance testing

[0080] The aromatherapy adhesives prepared in Examples 1-4 and Comparative Examples 1-3 were respectively applied to the surface of the second double-sided adhesive paper layer, and then the first double-sided adhesive paper layer was laid on top. A pressure of 0.6 MPa was applied and the mixture was then heat-dried and cured at 40°C for 30 minutes. After trimming, the aromatherapy paper sheets were obtained. 实施例1 Scented paper 实施例2 Scented paper 实施例3 Scented paper 实施例4 Scented paper 对比例1 Scented paper 对比例2 Scented paper 对比例3 .

[0081] Test Example 1: Sensory Test

[0082] Take scented paper 实施例1 Scented paper 实施例2 Scented paper 实施例3 Scented paper 实施例4 Scented paper 对比例1 Scented paper 对比例2 Scented paper 对比例3 The samples were placed in a natural environment at 25℃ and relative humidity (25±4)% to evaluate the fragrance persistence, oil seepage, and paper stability. The evaluation results are shown in Table 1 below.

[0083] Table 1

[0084]

[0085] As shown in Table 1, the aromatherapy adhesives prepared in Examples 1-3 of this application, when used as aromatherapy layers in aromatherapy sheets, exhibit good impermeability and structural stability, and also have a sustained-release effect. In Comparative Example 1, the absence of cottonseed lint resulted in poorer barrier properties of the aromatherapy layer in the prepared aromatherapy sheet, leading to a reduced sustained-release effect and causing essential oil leakage, thus affecting the structural stability of the aromatherapy sheet. In Comparative Example 2, the lack of encapsulation of essential oils using a cross-linking carrier with embedding function resulted in significant essential oil leakage and separation of the aromatherapy sheet layers. In Comparative Example 3, the absence of cross-linking treatment on the carrier also caused the encapsulated essential oils to leak out, contaminating the sheet.

[0086] Test Example 2

[0087] Take the aromatherapy paper from Test Example 1 after it has been left to stand for 7 days. 对比例1 Scented paper 对比例2 Peel off the scented paper. 对比例2 Scented paper 对比例3 The adhesive paper layer was rinsed with anhydrous ethanol, and the collected oil was analyzed by gas chromatography. The analytical results are as follows: Figure 1 As shown, Figure 1 The middle 'a' is a scented paper sheet. 对比例1 Gas chromatogram, Figure 1 b is a scented paper sheet. 对比例2 The gas chromatograms and gas-mass spectrometry confirmed that the main component of the surface oil stains was eucalyptol, which is the main component of eucalyptus essential oil. This indicates that the aromatherapy paper sheets prepared in Comparative Examples 1 and 2 had essential oil penetration, resulting in a decrease in the fragrance persistence and structural stability of the prepared paper sheets.

[0088] The foregoing has described some embodiments of the present invention in detail, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A method for preparing aromatherapy paper sheets, characterized in that, Take the first double-sided adhesive paper layer, the aromatherapy layer and the second double-sided adhesive paper layer, stack them in sequence, press and cure them, and cut them to obtain the aromatherapy paper sheet; The method for preparing the aromatherapy layer includes the following steps: S1. Take cyclodextrin, coordinating metal ions and deionized water, mix them, filter and collect the filtrate; S2. Take the filtrate and methanol, mix them, seal and heat treat them, add 8-hydroxyquinoline aluminum and hexadecyltrimethylammonium bromide, stir evenly, place at room temperature, centrifuge, take the solid phase, wash it, and vacuum dry it to obtain the carrier. S3. Take the carrier, citric acid, potassium dihydrogen phosphate and anhydrous ethanol, mix them, disperse them by ultrasonication, heat and stir in a water bath, then heat at 135-145℃ for 4-6 hours, cool, take the product, wash it, and vacuum dry it to obtain the crosslinked carrier. S4. Take the crosslinking carrier and anhydrous ethanol, mix them, add functional essential oil, disperse the mixture, centrifuge, and take the solid phase to obtain the essential oil inclusion complex. S5. Take cottonseed lint and starch glue, mix them, stir in a water bath, add the essential oil inclusion complex and continue stirring. Solidify the mixture after stirring to obtain the aromatherapy layer. In step S1, the molar ratio of the cyclodextrin to the coordinating metal ions is 1-2:10-12; In step S2, the ratio of the filtrate, methanol, 8-hydroxyquinoline aluminum, and hexadecyltrimethylammonium bromide is 40-60 mL: 80 mL: 0.8-1.2 mg: 0.2-0.3 mg. In step S3, the ratio of the carrier, citric acid, potassium dihydrogen phosphate, and anhydrous ethanol is 15-18 mg: 15-18 mg: 0.7-0.9 mg: 50-60 mL. In step S4, the ratio of the crosslinking carrier, anhydrous ethanol, and functional essential oil is 3-4 mg: 20 mL: 2-2.5 mL. In step S5, the ratio of the cottonseed lint, starch gum, and essential oil inclusion complex is 1-2 mg: 20-30 mL: 2.5-3.5 mg.

2. The method for preparing aromatherapy paper according to claim 1, characterized in that, The functional essential oils include any one or a combination of at least two of the following: lavender essential oil, lemon essential oil, sweet orange essential oil, jasmine essential oil, chamomile essential oil, tea tree essential oil, eucalyptus essential oil, rosemary essential oil, and rose essential oil.

3. The method for preparing aromatherapy paper according to claim 1, characterized in that, The cyclodextrin includes any one of α-cyclodextrin, β-cyclodextrin, or γ-cyclodextrin.

4. The method for preparing aromatherapy paper according to claim 1, characterized in that, The coordinating metal ion includes any one of sodium ion, potassium ion, or ferrous ion.

5. A scented paper sheet prepared by the preparation method according to any one of claims 1-4.

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