Two-color paste dyeing method for plant dyeing teaching

Abstract

The invention discloses a two-color paste dyeing method for plant dyeing teaching, which belongs to the technical field of dyeing, and is characterized in that a fabric with two-color patterns is prepared from materials such as dye-resistant paste, plant dye liquor, mordant and the like through dye-resistant paste scraping, dye-resistant paste scraping, plant dyeing and mordant dyeing. Especially, the fabric forms a color pattern which is darker than the color of the surrounding area in the area where the dye-resistant paste is scraped. According to the double-color pasting and dyeing method for plant dyeing teaching, the blank that traditional pasting and dyeing are single in color layer is filled up, and a course development mode integrating a traditional process, scientific exploration and art practice is provided.

Description

Technical Field

[0001] This invention relates to a two-color paste dyeing method for teaching plant dyeing, belonging to the field of dyeing technology. Background Technology

[0002] Plant dyeing is a traditional Chinese dyeing method that uses natural raw materials such as plant roots, stems, leaves, flowers, and fruits as dyes. It is characterized by its natural and environmentally friendly nature and its warm, delicate colors. To better promote this intangible cultural heritage, many schools have introduced plant dyeing courses, allowing students to experience the charm of traditional craftsmanship and cultivate their hands-on and aesthetic abilities.

[0003] Plant dyeing encompasses various traditional techniques. Direct immersion dyeing can only achieve a single-color effect; tie-dyeing relies on random textures, making precise pattern control difficult. Traditional paste dyeing can produce blue and white printed fabrics using stencils and resist paste, typically made from a mixture of soybean powder and lime. During the process, the resist paste is applied to the fabric surface with the aid of the stencil. After the paste is semi-dry or fully dry, the fabric is immersed in plant dye, and finally, the resist paste is washed away to reveal the pattern. While traditional paste dyeing can establish patterns, its use of "resist-retained white space" to present a single contrasting color prevents the creation of subtle color gradations on the same piece of fabric, limiting artistic creation and the scope for technological exploration. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a two-color paste dyeing method for teaching plant dyeing. Through the synergistic effect of resist paste components, desizing operation, plant dyeing, and mordant dyeing, the amount of color fixed in the pattern area is increased, filling the gap of the single color layer in traditional paste dyeing. It also provides a curriculum development model that integrates "traditional craftsmanship + scientific inquiry + artistic practice".

[0005] The present invention achieves the above objectives by adopting the following technical solutions:

[0006] A two-color paste-dyeing method for teaching plant dyeing includes the following steps:

[0007] S1. Lay the fabric flat, cover the fabric surface with a stencil, and evenly apply the anti-dye paste to the stencil. After application, remove the stencil.

[0008] S2. When the resist paste on the fabric is semi-dry or fully dry, scrape off the resist paste on the fabric surface, and a pattern area with the boundary defined by the resist paste treatment is formed on the fabric surface.

[0009] S3. Dye the fabric obtained in step S2 with plant dye solution.

[0010] The plant dye solution is prepared by water extraction of the dyeing material, which is any one or more of gallnut, mugwort, sappanwood, beggar-ticks, madder, or gardenia; among them, mugwort is usually made from its stems and leaves; sappanwood is made from its heartwood; beggar-ticks are made from their stems and leaves; madder is made from its roots; and gardenia is made from its fruit; dried or fresh dyeing materials can be used.

[0011] S4. Mordant dye the fabric obtained in step S3.

[0012] The mordant is an aqueous solution of alum with a concentration of 1-10 g / L;

[0013] S5. Rinse the fabric obtained in step S4 with water until there is no floating color, and air dry naturally to produce a fabric with a two-color pattern.

[0014] Preferably, the anti-dyeing paste in step S1 is made from the following raw materials in parts by weight: 1-5 parts raw soybean powder, 1 part slaked lime, and 3-20 parts water.

[0015] Preferably, in step S1, the fabric is a pure cotton white greige fabric, which is soaked in water for 5-60 minutes and rubbed, with a soaking temperature of 20-50℃.

[0016] Preferably, the preparation method of the plant dye solution in step S2 includes the following steps:

[0017] Cut the dye material into short pieces, add water, bring to a boil over high heat, then simmer over low heat for 10-20 minutes. Filter to remove residue, and you will get the product. The weight ratio of dye material to water is 1:(6-20).

[0018] Preferably, the dyeing method in step S2 includes the following steps:

[0019] Soak the fabric in a plant dye solution at 10-100℃ for 2-30 minutes.

[0020] Preferably, in step S2, the fabric is stirred once every 1-10 minutes during soaking.

[0021] Preferably, in step S2, the semi-dry state is characterized by a non-sticky surface and a slightly damp interior in the anti-dye paste.

[0022] Preferably, the mordant method in step S4 includes the following steps:

[0023] Immerse the fabric in a mordant solution at 10-50℃ for 5-10 minutes.

[0024] Typically, the environmental conditions for steps S1-S5 are: room temperature 26±2℃, humidity 50±5%.

[0025] The beneficial effects of the present invention include, but are not limited to:

[0026] This invention uses resist paste, plant dye, mordant, etc. as materials, and produces fabrics with two-color patterns after scraping and removing the resist paste, applying plant dye, and mordant. In particular, the fabric forms a colored pattern in the area where the resist paste is scraped on that is darker than the surrounding area.

[0027] Compared to traditional paste dyeing, which can only produce blue and white printed patterns, the method provided by this invention is a creative transformation based on traditional paste dyeing. By adjusting the process, it solves the pain point that "traditional techniques are difficult to teach and students are difficult to learn", providing a replicable and scalable practical path for intangible cultural heritage to enter schools. It not only fills the gap of the single color layer of traditional paste dyeing, but also provides a curriculum development model that integrates "traditional techniques + scientific inquiry + artistic practice", helping the living inheritance and innovative development of traditional techniques in schools. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0029] Figure 1 The prepared anti-staining photo;

[0030] Figure 2 A photo taken during the application of resist paste;

[0031] Figure 3 A photo taken when the resist paste is scraped off the fabric surface;

[0032] Figure 4 A photo of sappanwood dyeing materials;

[0033] Figure 5 This is a photo taken at the end of the sappanwood decoction;

[0034] Figure 6 A photograph taken when the hematoxylin stain solution was filtered out;

[0035] Figure 7 A photograph of the fabric being immersed in sappanwood dye solution;

[0036] Figure 8 A photograph of the fabric being immersed in mordant;

[0037] Figure 9 Photographs of dyed fabrics made with gallnut as the dye material;

[0038] Figure 10 Photographs of dyed fabrics made with mugwort as the dye material;

[0039] Figure 11 Photographs of dyed fabrics made with sappanwood as the dyeing material;

[0040] Figure 12 Photographs of dyed fabrics made with beggar-ticks as the dye material;

[0041] Figure 13 Photographs of dyed fabrics made with madder as the dye material;

[0042] Figure 14 A photograph of dyed fabrics made with indigo as the dye.

[0043] Figure 15 Photographs of dyed fabrics made with gardenia fruit as the dye material;

[0044] Figure 16 Photographs of dyed fabrics made using the traditional paste-dyeing method;

[0045] Figure 17 The results of a cross-sectional comparison of teachers' satisfaction with the two-color paste dyeing method for teaching plant dyeing provided by this invention;

[0046] Figure 18 The results show the achievement rate of students in creating works using the two-color paste dyeing method for teaching plant dyeing provided by this invention. Detailed Implementation

[0047] The present invention will be further described in detail below. However, it should be noted that the following specific embodiments are merely exemplary examples of the invention, and the scope of protection of the invention is not limited thereto. The scope of protection of the invention is defined only by the claims. It will be apparent to those skilled in the art that various other modifications and substitutions can be made to the embodiments of the invention within the scope of protection defined by the claims, and the same technical effects can still be achieved, thus achieving the ultimate technical objective of the invention.

[0048] The two-color paste dyeing method for teaching plant dyeing provided by this invention includes the following steps:

[0049] S1. Lay the fabric flat, cover the fabric surface with a stencil, and evenly apply the anti-dye paste to the stencil. After application, remove the stencil.

[0050] The fabric used is pure cotton greige fabric; the pure cotton greige fabric is soaked at 20-50℃ for 5-60 minutes and then washed normally.

[0051] The resist paste is made from the following raw materials in parts by weight: 1 part raw soybean powder, 1 part slaked lime, and 8 parts water. The raw soybean powder and slaked lime powder used in the current paste dyeing method can be used. Figure 1 The prepared anti-staining photo. Figure 2 A photo taken during the application of resist paste;

[0052] S2. When the resist paste on the fabric is semi-dry or fully dry, use a scraper to scrape off the resist paste on the fabric surface in the same direction to make the fabric surface flat and form a patterned area defined by the resist paste on the fabric surface. Figure 3 A photo taken when the resist paste is scraped off the fabric surface;

[0053] The semi-dry state is when the surface of the resist paste is not sticky and the inside is slightly moist. It usually takes 30-40 minutes at room temperature to reach the semi-dry state. The fully dry state is when the surface of the resist paste is hard and the inside is not moist. It can be crushed into powder or hard block when pinched. It usually takes ≥2 hours at room temperature to reach the fully dry state.

[0054] S3. Dye the fabric obtained in step S2 with plant dye solution.

[0055] The dyeing method includes the following steps:

[0056] Soak the fabric in a plant dye solution at 10-100℃ for 2-30 minutes, stirring the fabric once every 1-10 minutes during soaking.

[0057] The plant dye solution is prepared by water extraction of the dye material, which is any one or more of gallnut, mugwort, sappanwood, beggar-ticks, madder or gardenia; Figure 4 A photo of sappanwood dyeing materials;

[0058] The preparation method of plant dye solution includes the following steps:

[0059] Cut the dye material into short and small pieces, add water, bring to a boil over high heat, then simmer over low heat for 10-20 minutes. Filter to remove the residue to obtain the product. The weight ratio of dye material to water is 1:(6-20). Figure 5 This is a photo taken at the end of the sappanwood decoction. Figure 6 This is a photo taken when the dye solution was being filtered out. Figure 7 A photograph of the fabric being immersed in sappanwood dye solution;

[0060] S4. Mordant dye the fabric obtained in step S3.

[0061] The mordant method includes the following steps: immersing the fabric in a mordant solution at 10-50℃ for 5-10 minutes; Figure 8 A photograph of the fabric being immersed in mordant;

[0062] The mordant is an aqueous solution of alum with a concentration of 1-10 g / L;

[0063] S5. Rinse the fabric obtained in step S4 with water until there is no floating color, and air dry naturally to produce a fabric with a two-color pattern.

[0064] The environmental conditions for the above steps S1-S5 are: room temperature 26±2℃, humidity 50±5%.

[0065] The above method will be illustrated with specific examples below.

[0066] Example 1:

[0067] 1. Experimental Materials and Equipment

[0068] Pure cotton grey fabric: Pre-treated by desizing and scouring to remove impurities from the fiber surface, ensuring uniform dyeing, and suitable for elementary school students' creative designs.

[0069] Gallnut, Artemisia argyi, Sappanwood, Bidens pilosa, Rubia cordifolia, and Gardenia jasminoides are commercially available and readily available. They have no irritating odor and meet the safety standards for use on campus.

[0070] Raw soybean flour, slaked lime, and water.

[0071] Alum (potassium aluminum sulfate dodecahydrate) solution: concentration 5g / L, toxicity test results show it to be a safe dose, suitable for student operation.

[0072] Electronic balance (accuracy 0.1g), constant temperature water bath (temperature control ±1℃), perforated template (plastic, different patterns), scraper, measuring cup, beaker, drying rack.

[0073] Colorimeter (3nhPS110): Used to quantify color difference values ​​and avoid subjective evaluation errors.

[0074] Scraper: Made of plastic with rounded edges to prevent students from getting injured while using it.

[0075] 2. Evaluation Method:

[0076] 2.1 Use a colorimeter to measure the Lab value of different areas of the fabric. The lower the Lab value, the darker the color. Specifically, measure the L* value of the patterned area and the L* value of the non-patterned area of ​​the fabric, and calculate ΔL* = L* value of the patterned area - L* value of the non-patterned area.

[0077] 2.2 Measure the ΔE value using a colorimeter: Color difference, ΔE>3.5 is perceptible to the naked eye;

[0078] Each group was measured three times, and the average value was taken.

[0079] 2.3 Qualitative Indicators:

[0080] 2.3.1 Pattern clarity: rated as no bleeding, slight bleeding, or severe bleeding.

[0081] 2.3.2 Color fastness: The degree of color fading after 3 washes.

[0082] Twelve teachers from the image and sound group conducted a blind visual evaluation to assess the clarity and colorfastness of the patterns.

[0083] 3. Experimental Grouping:

[0084] Based on the core variable "whether or not the resist paste was applied and removed", the groups were divided into an experimental group (resist paste applied and semi-drying removal) and a control group (no resist paste applied), as well as a traditional paste dyeing comparison group (using Artemisia argyi as the dye material, resist paste applied but not removed). Mordant dyeing was performed in all groups.

[0085] Based on the classification variables "type of dye material", "timing of desizing (wet, semi-dry, fully dry)" and "type of resist paste", the experimental group and the control group were further divided into subgroups. Among them, wet state means desizing immediately after the resist paste is applied, semi-dry state means desizing when the surface of the resist paste is no longer sticky, and fully dry state means the resist paste is completely dry, hard and brittle.

[0086] Specifically, the dyeing materials are gallnut, mugwort, sappanwood, beggar-ticks, madder, gardenia, and indigo mud. Among them, gallnut, mugwort, sappanwood, beggar-ticks, madder, and gardenia are prepared into plant dyeing solutions according to the method of this invention, while indigo mud is a commercially available product. The reducing agent glucose solution is added to the indigo mud using conventional methods to adjust it to a yellow-green reduced state.

[0087] Process parameters:

[0088] Dye:water = 1:15, plant immersion conditions (60℃, 10min), mordant conditions (alum concentration 5g / L, 60℃, 10min), resist paste (raw soybean powder: slaked lime: water = 3:1:8).

[0089] 4. Experimental Results and Analysis:

[0090] Table 1 Comparison of color difference effects of different dyes

[0091]

[0092] From Table 1 and Figures 9-16 The results showed that, except for indigo, the L values ​​of the patterned areas in the experimental groups of the other six dyes were significantly lower than those in the non-patterned areas of the control group, with ΔL values ​​ranging from -3.3 to -14.7 and ΔE values ​​all greater than 4.5. The differences in shade were clearly distinguishable to the naked eye, and the pattern clarity was good. Only the mugwort showed slight color bleeding, and the color fastness met the requirements of teaching works.

[0093] Indigo dyeing materials exhibited a reverse effect, with the experimental group's L value (48.5) being higher than the control group's (40.2), and the ΔL value being +8.3.

[0094] like Figure 16 As shown, the patterned areas of the mugwort-dyed fabric obtained by traditional paste dyeing are light to white.

[0095] Table 2. Effect of desizing timing on staining effect (taking gallnut as an example)

[0096]

[0097] As shown in Table 2, the semi-dry state is the optimal time for desizing, with a ΔE value of 18.08, resulting in clear color contrast and no color bleeding in the pattern. Furthermore, it is easy to operate and suitable for elementary school students' hands-on abilities. While the fully dry state also has a high ΔE value, the anti-dye paste tends to peel off in large quantities, reducing color absorption in the pattern area and resulting in less noticeable color difference. The wet state, due to severe color bleeding, cannot meet teaching requirements.

[0098] 5. Educational value highlights practical significance

[0099] The stencil-paste dyeing method provided by this invention was applied to art classes for grades 5-6 in primary school (three classes were selected for pilot testing), such as... Figure 17 As shown, the teaching suitability and educational value of the method were evaluated through student work analysis, questionnaire survey (178 questionnaires were distributed and 165 valid questionnaires were returned), and teacher interviews.

[0100] like Figure 18 As shown, in a pilot program in 5th and 6th grade classrooms, 82% of students reported being able to precisely control the color gradations of patterns and showing greater interest in the scientific principles of plant dyeing. 78% of student works achieved the creative goal of "two shades of color + clear pattern." This technique integrates science (variable control, mechanism exploration) + art (color matching, pattern design) + labor (process operation, artwork completion), effectively enhancing students' core competencies and providing high-quality course resources for science and technology instructors.

[0101] The stencil dyeing method provided by this invention uses food-grade raw materials, has simplified operation steps (can be completed in 1-2 class periods), and has a 95% success rate for students to operate independently, making it fully suitable for primary school teaching.

[0102] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0103] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A two-color paste-dyeing method for teaching plant dyeing, characterized in that, Includes the following steps: S1. Lay the fabric flat, cover the fabric surface with a stencil, and evenly apply the anti-dye paste to the stencil. After application, remove the stencil. S2. When the resist paste on the fabric is semi-dry or fully dry, scrape off the resist paste on the fabric surface, and a pattern area with a boundary defined by the resist paste treatment is formed on the fabric surface. S3. Dye the fabric obtained in step S2 with plant dye solution. The plant dye solution is prepared by water extraction of the dye material, which is any one or more of gallnut, mugwort, sappanwood, beggar-ticks, madder or gardenia; S4. Mordant dye the fabric obtained in step S3. The mordant is an aqueous solution of alum with a concentration of 1-10 g / L; S5. Rinse the fabric obtained in step S4 with water until there is no floating color, and air dry naturally to produce a fabric with a two-color pattern.

2. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, The anti-dyeing paste in step S1 is made from the following raw materials in parts by weight: 1-5 parts raw soybean powder, 1 part slaked lime, and 3-20 parts water.

3. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, In step S1, the fabric used is pure cotton white greige fabric. The pure cotton white greige fabric is soaked in water for 5-60 minutes and rubbed. The soaking temperature is 20-50℃.

4. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, The preparation method of the plant dye solution in step S2 includes the following steps: Cut the dye material into short pieces, add water, bring to a boil over high heat, then simmer over low heat for 10-20 minutes. Filter to remove residue, and you will get the product. The weight ratio of dye material to water is 1:(6-20).

5. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, The dyeing method in step S2 includes the following steps: Soak the fabric in a plant dye solution at 10-100℃ for 2-30 minutes.

6. The two-color paste-dyeing method for teaching plant dyeing according to claim 5, characterized in that, In step S2, the fabric is stirred once every 1-10 minutes during soaking.

7. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, In step S2, the semi-dry state is when the surface of the resist paste is not sticky and the inside is slightly moist; the fully dry state is when the surface of the resist paste is hard, the inside is not moist, and it can be crushed into powder or hard lumps when pinched.

8. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, The mordant method in step S4 includes the following steps: Immerse the fabric in a mordant solution at 10-50℃ for 5-10 minutes.

9. The two-color paste-dyeing method for teaching plant dyeing according to claim 1, characterized in that, The environmental conditions for steps S1-S5 are: room temperature 26±2℃, humidity 50±5%.

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