Preparation method and application of handmade and washable holocellulose-based colloid adhesive
A washable adhesive was prepared by mixing all-cellulose-based materials and mechanical shear emulsification technology, which solved the environmental pollution and complex preparation problems of petroleum-based adhesives, and achieved high bonding strength and water resistance, making it suitable for the wood processing industry.
Patent Information
- Application Number
- CN202610444019.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-07
- Publication Date
- 2026-05-19
AI Technical Summary
Currently, adhesives used in the wood processing industry are mainly non-renewable petroleum-based adhesives, which pose environmental pollution and health risks. Furthermore, their preparation processes are complex, making it difficult to achieve high bonding strength and excellent water resistance under mild conditions.
Using all-cellulose-based materials, carboxymethyl cellulose, nanocellulose, and cellulose nanocrystals are mixed at room temperature and then emulsified by mechanical shearing to form a uniform and stable colloidal adhesive, avoiding high temperature and high pressure conditions and the generation of toxic byproducts.
This invention provides a green and environmentally friendly adhesive with excellent bonding performance and reusable washing properties, which simplifies the preparation process and expands the application prospects of cellulose-based wood adhesives.
Smart Images
Figure CN122060427A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of adhesive technology, and more specifically relates to a method for preparing and applying a handmade, washable, all-cellulose-based colloidal adhesive. Background Technology
[0002] Adhesives are a crucial component of modern industry, playing an irreplaceable role across various sectors. Currently, adhesives used in wood processing are primarily non-renewable petroleum-based adhesives, such as phenolic (PF) resin, urea-formaldehyde resin, and melamine-formaldehyde (MUF) resin. These adhesives account for 90% of all wood adhesives, offering advantages such as low cost, good processability, high bonding strength, and excellent water resistance. However, these adhesives are non-renewable and release formaldehyde and other harmful substances during use, posing risks to human health and the environment. Therefore, to achieve sustainable development for green and healthy housing, the use of renewable biomass materials, such as proteins, lignin, and starch, is becoming increasingly important. Consequently, developing environmentally friendly, renewable, and bio-based adhesives to replace traditional petroleum-based adhesives has become a growing research focus for researchers.
[0003] Bio-based adhesives refer to a class of adhesives prepared primarily from natural, renewable biomass through modification or compounding with other materials. Due to the advantages of biomass resources, such as wide availability, low cost, renewability, and biodegradability, biomass adhesives have long been at the forefront of adhesive research and remain a hot topic and key research area. Cellulose, as the most abundant biomass resource in nature and also the most abundant organic polymer, contains a large number of reactive groups in its molecular structure, providing potential for various chemical modifications and wide-ranging applications.
[0004] Therefore, developing a simple, efficient, and environmentally friendly cellulose-based adhesive that achieves high bonding strength and excellent water resistance under mild conditions, and thus provides a feasible technical solution for replacing traditional petroleum-based products and promoting the green and sustainable development of industries such as wood processing, has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0005] The purpose of this invention is to provide a method for preparing and applying a hand-washable, water-based, all-cellulose-based colloidal adhesive, in order to solve the problems existing in the prior art.
[0006] To achieve the above objectives, the present invention provides the following solution: One of the technical solutions of this invention is: a method for preparing a handmade, washable, all-cellulose-based colloidal adhesive, comprising the following steps: Carboxymethyl cellulose (CMC) was dispersed in water, followed by the addition of an aqueous solution of nanocellulose (CNF), and then ultrasonically dispersed to obtain a co-aqueous dispersion. A cellulose nanocrystal (CNC) aqueous solution was added to the co-aqueous dispersion, and the mixture was subjected to mechanical shearing emulsification to obtain the hand-washable, water-washable, all-cellulose-based colloidal adhesive.
[0007] Furthermore, the mass ratio of carboxymethyl cellulose to water is 0.1-1:15-25.
[0008] Furthermore, the mass fraction of the nanocellulose aqueous solution is 0.1-1.0 wt%.
[0009] Furthermore, the mass ratio of the carboxymethyl cellulose and nanocellulose aqueous solution is 0.1-1:5-10.
[0010] Furthermore, the mass fraction of the cellulose nanocrystal aqueous solution is 10-18 wt%.
[0011] Furthermore, the mass ratio of the carboxymethyl cellulose and the aqueous solution of cellulose nanocrystals is 0.1-1:34-90.
[0012] Furthermore, the ultrasonic dispersion time is 10-30 min.
[0013] Furthermore, the mechanical shear emulsification process is carried out at a rotation speed of 500-3000 rpm for a duration of 30-60 min.
[0014] Furthermore, the nanocellulose in the aqueous nanocellulose solution has a diameter of 5-10 nm.
[0015] Furthermore, the diameter of the cellulose nanocrystals in the aqueous solution of the cellulose nanocrystals is 5-20 nm.
[0016] The second technical solution of the present invention provides a handmade, washable, all-cellulose-based colloidal adhesive prepared by the above preparation method.
[0017] The third technical solution of the present invention provides an application of the above-mentioned hand-washable, all-cellulose-based colloidal adhesive in the field of wood processing.
[0018] Fourth technical solution of the present invention: A bonding method for the above-mentioned hand-applied, washable, all-cellulose-based colloidal adhesive, comprising the following steps: Apply the hand-washable, water-washable, all-cellulose-based colloidal adhesive at a single-sided coating amount of 100 g / m². 2 ~200 g / m 2 Coat the wood surface, then stack them to complete the bonding.
[0019] The present invention discloses the following technical effects: This invention uses all-cellulose-based materials as the core raw material, overcoming the shortcomings of existing adhesive preparation processes, such as complex processes (requiring multiple chemical reactions and high-temperature and high-pressure conditions), raw materials containing toxic volatile organic compounds (such as formaldehyde and isocyanates), and environmental pollution risks. It provides a green and environmentally friendly colloidal adhesive with excellent bonding performance and reusable washing properties. The preparation method of this adhesive breaks through the limitations of traditional high-temperature polymerization processes. It only requires mixing cellulose nanocrystals (CNC), carboxymethyl cellulose (CMC), nanocellulose fibers (CNF), and deionized water in a specific mass ratio at room temperature, followed by mechanical shear emulsification. Under the action of mutual hydrogen bonds, a uniform and stable milky white all-cellulose-based adhesive colloidal system is formed. No toxic byproducts are generated throughout the entire preparation process.
[0020] The present invention has a simple preparation process, strong scalability, and is easy to scale up for production. It provides a new approach for the preparation of cellulose-based wood adhesives and has broad application prospects in the field of adhesives. Attached Figure Description
[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a photograph of the handmade, washable, all-cellulose-based colloidal adhesive prepared in Example 2.
[0022] Figure 2 The tensile test results of the composite slab prepared in Example 2 are shown in Figure a, where a is a photograph of the tensile test and b is the tensile stress-strain curve.
[0023] Figure 3 The load-bearing diagram is shown for the composite slab prepared in Example 2.
[0024] Figure 4 The images show the stretched and unstretched states of the bacterial cellulose membrane (BC membrane) bonded by the hand-washable, water-based all-cellulose colloidal adhesive prepared in Example 2. The left image shows the unstretched state, and the right image shows the stretched state.
[0025] Figure 5 This is a digital photograph of a glass culture dish bonded by hand using the washable, all-cellulose-based colloidal adhesive prepared in Example 2. Detailed Implementation
[0026] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.
[0027] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.
[0028] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.
[0029] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.
[0030] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.
[0031] Unless otherwise specified, all raw materials and reagents involved in the specific embodiments of this invention are commercially available products.
[0032] Unless otherwise specified, room temperature and ambient temperature in the specific embodiments of this invention refer to 20-30℃.
[0033] It should be noted that any aspects not described in detail in this invention are conventional practices in the field and are not the focus of this invention.
[0034] In the specific embodiments of this invention, the carboxymethyl cellulose used is a commercially available product of Shanghai Aladdin Biochemical Technology Co., Ltd.; the diameter of the nanocellulose in the nanocellulose aqueous solution is about 5-10 nm; and the diameter of the cellulose nanocrystals in the cellulose nanocrystal aqueous solution is about 5-20 nm.
[0035] Example 1 The preparation steps for a handmade, washable, all-cellulose-based colloidal adhesive include: S1. Weigh 0.1 g of carboxymethyl cellulose powder and disperse it in 12.7 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 10 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 77.2 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a hand-washable, water-washable all-cellulose-based colloidal adhesive.
[0036] Example 2 The preparation steps for a handmade, washable, all-cellulose-based colloidal adhesive include: S1. Weigh 0.2 g of carboxymethyl cellulose powder and disperse it in 12.6 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 10 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 77.2 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a hand-washable, water-washable all-cellulose-based colloidal adhesive.
[0037] Example 3 The preparation steps for a handmade, washable, all-cellulose-based colloidal adhesive include: S1. Weigh 0.3 g of carboxymethyl cellulose powder and disperse it in 12.5 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 10 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 77.2 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a hand-washable, water-washable all-cellulose-based colloidal adhesive.
[0038] Example 4 The preparation steps for a handmade, washable, all-cellulose-based colloidal adhesive include: S1. Weigh 0.4 g of carboxymethyl cellulose powder and disperse it in 12.4 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 10 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 77.2 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a hand-washable, water-washable all-cellulose-based colloidal adhesive.
[0039] Comparative Example 1 The preparation steps of colloidal adhesives include: S1. Weigh 0.2 g of carboxymethyl cellulose powder and disperse it in 18 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 5 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 77.2 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose obtained in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a colloidal adhesive.
[0040] Comparative Example 2 The preparation steps of colloidal adhesives include: S1. Weigh 0.2 g of carboxymethyl cellulose powder and disperse it in 8 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 15 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 77.2 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose obtained in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a colloidal adhesive.
[0041] Comparative Example 3 The preparation steps of colloidal adhesives include: S1. Weigh 0.2 g of carboxymethyl cellulose powder and disperse it in 51.6 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 10 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 38.6 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose obtained in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a colloidal adhesive.
[0042] Comparative Example 4 The preparation steps of colloidal adhesives include: S1. Weigh 0.2 g of carboxymethyl cellulose powder and disperse it in 5.2 g of deionized water to obtain a carboxymethyl cellulose dispersion. S2. Add 10 g of 1.0 wt% nanocellulose aqueous solution to the carboxymethyl cellulose dispersion in step S1, and ultrasonically disperse for 30 min to obtain a co-aqueous dispersion of carboxymethyl cellulose and nanocellulose. S3. Add 85 g of a 16 wt% aqueous solution of cellulose nanocrystals to the co-aqueous dispersion of carboxymethyl cellulose and nanocellulose in step S2, and mechanically shear emulsify at 4000 rpm for 60 min to obtain a colloidal adhesive.
[0043] Test case Figure 1 This is a photograph of the handmade, washable, all-cellulose-based colloidal adhesive prepared in Example 2.
[0044] The colloidal adhesives prepared in the examples and comparative examples were tested, and the steps are as follows: Three-layer plywood was prepared using eucalyptus veneers. The moisture content of the eucalyptus veneers was between 10-15%, and their length, width, and thickness were 100 mm, 20 mm, and 10 mm, respectively. One veneer was selected as the core board, and adhesive was applied to both sides at a rate of 150 g / m². 2 After gluing, two more eucalyptus veneers were adhered to the top and bottom surfaces of the core board and aged in a dark, room-temperature environment for 60 minutes. Then, the adhered three-layer board was hot-pressed at a pressure of 1.3 MPa, a temperature of 140 ℃, and a pressing time of 15 minutes. After hot-pressing, the plywood was left at room temperature for 72 hours, and then tested according to the testing methods in GB / T17657-1999 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". The test results are shown in Table 1.
[0045] Table 1 The adhesives prepared in the examples and comparative examples were used for bonding wood, and the steps are as follows: Prepare wood chips with dimensions of 100 mm × 20 mm × 1 mm. Apply adhesive to an area of 20 mm × 20 mm with a coating amount of 150 g / m². 2 The areas coated with adhesive are stacked and left to cure at room temperature to obtain a composite board blank.
[0046] Figure 2 The tensile test results of the composite slab prepared in Example 2 are shown in Figure a, where a is a photograph of the tensile test and b is the tensile stress-strain curve.
[0047] Figure 3 This is a load-bearing diagram of the composite slab prepared in Example 2. Figure 3 It can be seen that the prepared adhesive can bond wood chips and can support weights of 20 g and 50 g.
[0048] Prepare a bacterial cellulose membrane with dimensions of 100 mm × 20 mm × 1 mm. Coat an area of 20 mm × 20 mm with adhesive at a coating amount of 150 g / m². 2 The areas coated with adhesive are stacked and left to cure at room temperature to obtain a composite film blank.
[0049] Figure 4 The images show the stretched and unstretched states of the bacterial cellulose membrane (BC membrane) bonded by the hand-washable, water-based all-cellulose colloidal adhesive prepared in Example 2. The left image shows the unstretched state, and the right image shows the stretched state.
[0050] Figure 5 A digital photograph of a glass petri dish.
[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for preparing a handmade, washable, all-cellulose-based colloidal adhesive, characterized in that the steps include... include: Carboxymethyl cellulose was dispersed in water, followed by the addition of an aqueous solution of nanocellulose, and then ultrasonically dispersed to obtain a co-aqueous dispersion. A cellulose nanocrystal aqueous solution was added to the co-aqueous dispersion, and the mixture was subjected to mechanical shear emulsification to obtain the hand-washable, water-washable, all-cellulose-based colloidal adhesive.
2. The preparation method according to claim 1, characterized in that, The mass ratio of carboxymethyl cellulose to water is 0.1-1:15-25.
3. The preparation method according to claim 1, characterized in that, The mass fraction of the nanocellulose aqueous solution is 0.1-1.0 wt%; And / or, the mass ratio of the aqueous solution of carboxymethyl cellulose and nanocellulose is 0.1-1:5-10.
4. The preparation method according to claim 1, characterized in that, The cellulose nanocrystal aqueous solution has a mass fraction of 10-18 wt%. And / or, the mass ratio of the carboxymethyl cellulose and the aqueous solution of cellulose nanocrystals is 0.1-1:34-90.
5. The preparation method according to claim 1, characterized in that, The ultrasonic dispersion time is 10-30 min.
6. The preparation method according to claim 1, characterized in that, The mechanical shear emulsification process is performed at a speed of 500-3000 rpm for 30-60 min.
7. The preparation method according to claim 1, characterized in that, The mass fraction of the carboxymethyl cellulose is 2-5%; And / or, the nanocellulose in the aqueous nanocellulose solution has a diameter of 5-10 nm; And / or, the diameter of the cellulose nanocrystals in the aqueous solution of the cellulose nanocrystals is 5-20 nm.
8. A washable, all-cellulose-based colloidal adhesive for hand use, prepared by the method according to any one of claims 1-7.
9. The application of the hand-washable, all-cellulose-based colloidal adhesive of claim 8 in the field of wood processing.
10. A bonding method using the hand-applied, washable, all-cellulose-based colloidal adhesive as described in claim 8, characterized in that the steps include... include: Apply the hand-washable, water-washable, all-cellulose-based colloidal adhesive at a single-sided coating amount of 100 g / m². 2 ~200 g / m 2 Apply the coating to the wood surface, then stack the layers. After curing, the bonding is complete.