Anti-scratch acrylic roller shutter fabric and preparation method thereof

Abstract

The invention discloses an anti-scratch acrylic roller shutter fabric and a preparation method thereof. The preparation method comprises the following steps: preparing an anti-scratch surface slurry consisting of 20-25wt% of a water-based acrylate emulsion (Tg is-18 DEG C to-10 DEG C), 10-15wt% of a polyurethane aqueous dispersion (the elastic modulus is 1-3MPa) and water; blade-coating the surface slurry on the front surface of the base cloth, and drying at 155-165 DEG C; sequentially carrying out three-layer foaming coating finishing on the back surface of the base cloth and drying to form a shading layer; and coating anti-sticking layer glue on the surface of the shading layer, and drying at 150-160 DEG C. Through high-temperature compounding of the acrylic acid with specific Tg and the specific low-modulus polyurethane, an interpenetrating network structure with an elastic self-repairing function is formed on the surface of the fabric, so that the scratch resistance of the dark-color coating fabric is remarkably improved, and the technical problems of easiness in whitening, easiness in wrinkling and light leakage due to long-term bending are solved; and meanwhile, the excellent shading property and the excellent draping feeling are considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile finishing, in particular to an anti-scratch acrylic roller blind fabric and a preparation method thereof. BACKGROUND

[0002] With the increasing demand for light-shielding window curtains, plain weave fabrics (such as oxford cloth, etc.) are widely used in the production of roller blinds and light-shielding curtains due to their tight texture and simple style. In order to make such fabrics have excellent drape, crispness and physical light-shielding performance, it is usually necessary to coat the back and front of the fabric several times.

[0003] Most of the current light-shielding roller blind fabrics use acrylic emulsion as the main raw material for coating glue. Although acrylic coating has good film-forming property and weather resistance, it still has the following outstanding problems in practical application:

[0004] Firstly, the problem of "scratch whitening" is serious. Because the pure acrylic coating has high hardness and certain brittleness after drying and film-forming, when the fabric (especially dark color fabric such as black, coffee color, etc.) is bumped or rubbed by hard objects during processing, transportation, installation or daily rolling and pulling, the coating surface is prone to permanent scratches. Microstructurally, these scratches show that silver lines or microcracks are generated locally in the coating, and macroscopically, they show obvious white scratches, which seriously affect the appearance and quality of the product.

[0005] Secondly, the insufficient bending resistance of the coating leads to light leakage. The light-shielding coating usually contains a multi-layer foaming structure (white-black-white). Due to the limited flexibility of the existing acrylic coating, after the fabric is rolled up, put down or deformed by wind for a long time, the coating structure is prone to small fractures or peeling. These physical damages will form visible "pinholes", causing local light leakage and reducing the light-shielding function of the fabric.

[0006] Finally, the contradiction between drape and flexibility. In order to pursue good drape, the existing technology often increases the hardness of the coating to achieve this, but this will further worsen the foldability of the fabric.

[0007] Therefore, it is a technical problem to be solved in the field to develop an innovative coating technology that can maintain good light-shielding and drape performance, significantly improve the anti-scratch ability and solve the problem of white scratch on dark fabric. SUMMARY

[0008] The technical problem to be solved by the present application is to provide an anti-scratch acrylic roller blind fabric and a preparation method thereof, which solves the technical defects of existing dark acrylic coating fabric, such as easy to produce white scratches, easy to wrinkle and coating damage and light leakage after long-term use due to high brittleness.

[0009] The technical scheme adopted by the present application to solve its technical problems is:

[0010] A preparation method of an anti-scratch acrylic roller blind fabric, comprising the following steps:

[0011] S1, preparing an anti-scratch surface paste: mixing water-based acrylic emulsion, polyurethane water dispersion and water, adding a thickening agent to adjust the viscosity to 200000-250000 mPa·s; wherein, according to the weight percentage, the water-based acrylic emulsion is 20-25%, the polyurethane water dispersion is 10-15%, and the water is 60-70%; wherein, the glass transition temperature of the water-based acrylic emulsion is-18℃ to-10℃; the elastic modulus of the polyurethane water dispersion is 1-3MPa;

[0012] S2, front coating: evenly coating the anti-scratch surface paste prepared in step S1 on one side of the base cloth, and drying, the drying temperature is 155℃-165℃;

[0013] S3, back foaming coating: on the side of the base cloth which has not been coated with the anti-scratch surface paste, three layers of foaming coating are arranged in sequence and dried to form a light-shielding foaming layer;

[0014] S4, anti-adhesion finishing: coating anti-adhesion adhesive on the surface of the light-shielding foaming layer formed in step S3 and drying, the drying temperature is 150℃-160℃.

[0015] On the basis of the above scheme, preferably, the back foaming coating of step S3 specifically comprises the following sub-steps:

[0016] S31, the first layer of glue containing 60-70wt.% water-based acrylic emulsion, 10-15wt.% titanium white paste, 10-15wt.% ammonium stearate foam stabilizer and 2-3wt.% blocked isocyanate crosslinking agent is foamed by a foaming machine at a ratio of 3.5-3.7, then coated on the back of the base cloth and dried;

[0017] S32, adding 10-15wt.% carbon black paste to the first layer of glue to prepare the second layer of glue, foaming by a foaming machine at a ratio of 3.1-3.3, then coating on the surface of the first foaming layer and drying;

[0018] S33, foaming the first layer of glue by a foaming machine at a ratio of 3.3-3.5, then coating on the surface of the second foaming layer and drying.

[0019] Wherein, the viscosity of the first layer, the second layer and the third layer of glue is adjusted to 10000-15000cps, and the drying temperature is 160℃.

[0020] In addition, the application also provides an anti-scratch acrylic roller blind fabric prepared by the above preparation method. The fabric comprises a base cloth layer, one side of the base cloth layer is provided with an anti-scratch layer formed by blending acrylic ester and polyurethane, and the other side is sequentially provided with a white foaming bottom layer, a black foaming light-shielding layer, a white foaming surface layer and an anti-sticking layer.

[0021] The application has the following advantages:

[0022] Compared with the prior art, the application has the following advantages:

[0023] 1. Excellent anti-scratch self-repairing performance is achieved

[0024] The application changes the mechanical behavior of the coating from the micro level by precisely controlling the elastic modulus of the polyurethane water dispersion to be 1-3 MPa and compounding the acrylic emulsion with a glass transition temperature of-18℃ to-10℃. Under the front drying process at 155-165℃, the low-modulus polyurethane component can form a uniform elastic network with the acrylic matrix. When the surface of the fabric is scratched by a hard object, the network can absorb and disperse energy, causing elastic deformation of the coating rather than brittle fracture, which fundamentally eliminates the whitening and silver streaks caused by damage to dark fabrics, and significantly improves the anti-scratch effect.

[0025] 2. The physical durability and light-shielding stability of the coating are significantly improved

[0026] Due to the introduction of polyurethane with a specific modulus range as a toughening component, the flexibility of the overall coating and the bonding force with the base cloth are greatly strengthened. The coating structure of the fabric prepared by the application can still remain intact after long-term rolling, bending or wind deformation, and is not prone to cracking or delamination. This effectively solves the problem of local "pinhole" light leakage of traditional pure acrylic coating fabric due to long-term use, ensuring the long-term stability of the light-shielding function of the roller blind fabric.

[0027] 3. The high-temperature anti-sticking finishing process is optimized, taking into account anti-sticking and production efficiency

[0028] The drying temperature of the anti-sticking finishing process in the application is set to 150-160℃. This temperature range matches the heat treatment temperature of the front anti-scratch coating and the back foaming layer, ensuring that the silicone anti-sticking component can quickly complete surface enrichment and curing at high temperature. While ensuring that the vehicle speed is increased to 35M / Min for efficient production, the silicone oil molecules form a dense protective film on the surface of the coating, effectively solving the problem of back sticking and peeling damage of the fabric during winding in a high-temperature environment.

[0029] 4. An efficient and synergistic process parameter matrix is formed

[0030] The present application controls the viscosity of each layer of coating (20-250,000 mPa s on the front, 1-1.5 million cps on the back), the foaming ratio (3.1-3.7) and the precise control of the whole process high temperature drying (150-165 DEG C), so that the fabric has excellent scratch resistance while still maintaining good crispness and drape. The synergistic effect of such process parameters realizes the best balance of cost, capacity and product quality without increasing the complexity of subsequent processing, and has strong industrial application value. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in conjunction with specific examples. The raw materials (acrylate emulsion, polyurethane water dispersion, color paste, crosslinking agent, etc.) used in the present application are all commercially available industrial grade products.

[0032] Process principle and advancement analysis of the present application:

[0033] The temperature control of step S2 has a decisive physical significance for realizing the core invention purpose of "scratch resistance". The core means of the present application is to use acrylate with Tg of-18 to-10 DEG C and polyurethane with modulus of 1-3 MPa, and the film forming quality is highly related to the heat treatment temperature.

[0034] (1) Physical nature: This blending system needs to be treated by a specific heat treatment (preferably 155-165 DEG C, for example 160 DEG C) to promote the deformation, diffusion and mutual penetration of the two polymer particles, forming an "interpenetrating polymer network" (IPN) structure.

[0035] (2) Special and critical nature of temperature: if the drying temperature of the front coating is lower than 155 DEG C, the polyurethane particles cannot be effectively embedded in the acrylate matrix, resulting in poor coating resilience and displacement under stress to produce scratches; if the temperature is higher than 165 DEG C, it may cause thermal degradation of the polymer or brittleness of the base cloth. Therefore, 155-165 DEG C (represented by 160 DEG C) is the critical condition interval to ensure that the specific Tg and modulus raw materials can "perfectly fuse" and produce scratch resistance effect.

[0036] (3) Advancement of the scheme:

[0037] Synergistic effect: not a simple superposition of raw materials, but through the coupling of precise control of Tg, modulus and heat treatment temperature, the coating has self-repairing elasticity and scratch resistance similar to "skin" while maintaining the light shielding function.

[0038] Long-acting: it enhances the toughness of the coating, solves the structure damage and light leakage problem of light shielding fabric caused by long-term bending, and significantly prolongs the service life.

[0039] (4) Synergy with the back process:

[0040] In comparison, the main function of the back-side foamed coating (S31-S33) is focused on light shielding and filling. The back-side three-layer coating achieves light shielding through the physical accumulation of titanium white and carbon black, and achieves a full hand feel through the bubble generated by ammonium stearate, which, together with the front-side scratch-resistant coating, constitutes a composite structure that takes into account both function and aesthetics.

[0041] Example 1 (median example)

[0042] This example provides an anti-scratch acrylic roller blind fabric, and the preparation process is as follows:

[0043] S1, prepare an anti-scratch surface paste: weigh 22.5 kg of water-based acrylate emulsion with a Tg of -15°C, 12.5 kg of polyurethane water dispersion with an elastic modulus of 2 MPa, and 65 kg of water, mix and stir, and add a cellulose thickener to adjust the viscosity to 220,000 mPa·s.

[0044] S2, front-side coating: uniformly spread the above-mentioned surface paste on the front side of a coffee-colored oxford cloth, and dry at 160°C.

[0045] S3, back-side three-layer foamed coating:

[0046] S31 (first layer): mix and adjust the viscosity of 65% acrylate emulsion, 12% titanium white paste, 12% foam stabilizer, and 2.5% crosslinking agent to 12,500 cps, then spread after foaming at a foaming rate of 3.6 times, and dry at 160°C.

[0047] S32 (second layer): add 12% carbon black paste to the first layer paste, adjust the viscosity to 12,500 cps, then spread after foaming at a foaming rate of 3.2 times, and dry at 160°C.

[0048] S33 (third layer): same as the first layer paste, spread after foaming at a foaming rate of 3.4 times, and dry at 160°C.

[0049] S4, anti-sticking finishing: mix 5% silicone oil and 95% water, thicken to 220,000 cps, dry at 155°C after coating, and the vehicle speed is 35 M / Min.

[0050] Example 2 (lower limit example)

[0051] This example is used to verify the effectiveness of the lower limit of the parameters.

[0052] Anti-scratch surface paste: acrylate emulsion 20 kg (Tg = -18°C), polyurethane dispersion 10 kg (modulus = 1 MPa), water 70 kg.

[0053] Process parameters: front-side drying temperature is 155°C, and anti-sticking layer drying temperature is 150°C.

[0054] The remaining steps and back adhesive formulation are the same as Example 1.

[0055] Example 3 (upper limit of the range)

[0056] This example is used to verify the effectiveness of the upper limit of the parameter.

[0057] Anti-scratch face paste: acrylic emulsion 25 kg (Tg = -10°C), polyurethane dispersion 15 kg (modulus = 3 MPa), water 60 kg.

[0058] Process parameters: front side drying temperature is 165°C, anti-adhesive layer drying temperature is 160°C.

[0059] The remaining steps and back adhesive formulation are the same as Example 1.

[0060] Comparative example and performance verification experiment:

[0061] In order to prove the necessity of the core technical features of the present application, the following comparative example is designed to test the performance.

[0062] 1. Component ratio comparison experiment (verify the necessity of the amount of polyurethane added)

[0063] Use the raw materials and process of Example 1, only change the ratio of acrylic acid and polyurethane in the front paste:

[0064]

[0065] 2. Polyurethane modulus comparison experiment (verify the necessity of the core parameter 1-3 MPa)

[0066] Use the ratio of Example 1, only replace polyurethane raw materials with different modulus:

[0067]

[0068]

[0069] 3. Front side drying temperature comparison experiment (verify the necessity of 155-165°C)

[0070] Use the formulation of Example 1, change the front coating drying temperature:

[0071]

[0072] Test conclusion:

[0073] From the comprehensive data of the above examples and comparative examples, it can be seen that:

[0074] 1. Component synergy: 10-15 wt.% of polyurethane is the key to eliminating scratches.

[0075] 2. Physical matching: low modulus polyurethane of 1-3 MPa matches specific Tg of acrylic acid, under baking conditions of 155-165 DEG C, to form a self-repairing coating structure with high resilience.

[0076] 3. Comprehensive performance: the fabric prepared by the application not only solves the scratch whitening problem of dark fabric, but also does not appear light leakage pinhole in long-term bending test, and has significant technical advancement.

Claims

1. A method for preparing a scratch-resistant acrylic roller blind fabric, characterized in that, Includes the following steps: S1. Preparation of anti-scratch surface paste: Mix waterborne acrylic emulsion, polyurethane aqueous dispersion and water, and add thickener to adjust the viscosity to 200,000-250,000 mPa·s; wherein, by weight percentage, the waterborne acrylic emulsion is 20-25%, the polyurethane aqueous dispersion is 10-15%, and water is 60-70%; the glass transition temperature of the waterborne acrylic emulsion is -18℃ to -10℃; the elastic modulus of the polyurethane aqueous dispersion is 1-3 MPa. S2, Front coating: Apply the anti-scratch paste prepared in step S1 evenly to one side of the base fabric and dry it at a temperature of 155℃-165℃. S3, Back foam coating: On the side of the base fabric that has not been coated with anti-scratch paste, three layers of foam coating are applied and dried to form a light-shielding foam layer; S4. Anti-adhesion finishing: Apply anti-adhesion adhesive to the surface of the light-shielding foam layer formed in step S3 and dry it.

2. The preparation method according to claim 1, characterized in that, The back foam coating described in step S3 specifically includes the following sub-steps: S31. The first layer of adhesive containing water-based acrylic emulsion, titanium dioxide paste, foam stabilizer and crosslinking agent is foamed in a foaming machine at a ratio of 3.5-3.7, coated on the back of the base fabric and dried. S32. Add 10-15 wt.% carbon black paste to the first layer of adhesive to prepare the second layer of adhesive. After foaming with a foaming machine at a ratio of 3.1-3.3, apply it to the surface of the first foamed layer and dry it. S33. The first layer of adhesive is foamed at a ratio of 3.3-3.5 using a foaming machine, then applied to the surface of the second foamed layer and dried.

3. The preparation method according to claim 2, characterized in that, The components of the first layer of adhesive, by weight percentage, are: 60-70% water-based acrylic emulsion, 10-15% titanium dioxide paste, 10-15% ammonium stearate foam stabilizer, and 2-3% end-capped isocyanate crosslinking agent.

4. The preparation method according to claim 2, characterized in that, The viscosity of the first, second, and third layers of adhesive was adjusted to 10,000-15,000 cps.

5. The preparation method according to claim 3, characterized in that, The drying temperature in steps S31-S33 is 160℃, and the vehicle speed is 25m / min.

6. The preparation method according to claim 1, characterized in that, The anti-adhesive layer adhesive described in step S4 is made by mixing and stirring 5 wt.% silicone oil and 95 wt.% water, and adding cellulose thickener to thicken it to a viscosity of 200,000-250,000 cps.

7. The preparation method according to claim 1, characterized in that, The drying temperature in step S4 is up to 150℃-160℃, and the speed is 35M / Min.

8. The preparation method according to claim 1, characterized in that, The base fabric is brown Oxford cloth.

9. A scratch-resistant acrylic roller blind fabric, characterized in that, The fabric is prepared by the preparation method according to any one of claims 1-8; the fabric includes a base fabric layer, one side of which has an anti-scratch layer formed by blending acrylate and polyurethane, and the other side has, in sequence, a white foamed bottom layer, a black foamed light-blocking layer, a white foamed top layer and an anti-sticking layer.

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