A production process for a colorful, high-brightness heat-bonded reflective fabric

Abstract

This invention relates to the field of reflective materials technology and discloses a production process for a high-brightness, multi-colored heat-bonded reflective fabric. This fabric is produced by first preparing an aluminized beaded film, then preparing a water-based polyurethane transfer adhesive, coating the water-based polyurethane transfer adhesive onto a synthetic fiber fabric, drying it, and then bonding the adhesive surface to the aluminized surface of the aluminized beaded film. Finally, it undergoes curing. By adding long-chain aliphatic hydrocarbon-modified polypropylene glycol containing active methylene groups and oxazolidinone-modified polybutadiene with a rigid structure during the preparation of the water-based polyurethane transfer adhesive, the prepared water-based polyurethane transfer adhesive exhibits good water resistance and high-temperature resistance, preventing the glass microspheres from falling off during washing due to reduced adhesive bonding performance, thereby improving the durability of the reflective fabric.

Description

Technical Field

[0001] This invention relates to the field of reflective materials technology, specifically to a production process for a colorful, high-brightness heat-bonded reflective fabric. Background Technology

[0002] Reflective materials, also known as retroreflective materials, include reflective films, reflective fabrics, reflective leather, reflective strips, and reflective inks. They primarily work by embedding high-refractive-index glass microspheres or forming microprism structures on the surface of a substrate. This causes most of the reflected light to return to the direction of the light source along the incident light path, creating a retroreflection phenomenon. At night or in low-light conditions, this retroreflection function produces a high visibility effect, effectively preventing accidents and providing safety for travelers. They are widely used in various traffic safety facilities such as road markings, traffic signs, traffic cones, and crash barriers, as well as in communication and other applications. Reflective fabric is used in various fields, including power, clothing, bags, and billboards. Besides serving a warning function in uniforms for firefighters, road maintenance workers, and police, it can also be used in fashion and sportswear for aesthetic purposes. Reflective fabric is made by creating a plant layer from glass microspheres, then coating a base fabric with transfer adhesive, and finally laminating it with the plant layer. After curing, the transfer adhesive plays a crucial role in its preparation. Transfer adhesives mainly include two categories: polyurethane and polyacrylate, both of which have excellent adhesion properties, preventing the glass microspheres from detaching and thus achieving a warning or aesthetic effect.

[0003] Patent application number 201410069828.2 discloses a transfer composite adhesive for high-brightness reflective fabric and its preparation method. A polyacrylate composite adhesive is synthesized through graft copolymerization, which not only maintains good initial tack but also significantly improves holding power. When applied to high-brightness reflective fabric, its resistance to rubbing and washing is far superior to random copolymers. Waterborne polyurethane transfer adhesives are favored due to their environmental friendliness and alignment with current societal needs. However, waterborne polyurethane contains a large number of hydrophilic groups, resulting in poor water resistance. Furthermore, as a linear polymer, its high-temperature resistance is also poor. The performance of the transfer adhesive directly affects the application performance of the reflective fabric. During frequent washing, the poor water and high-temperature resistance of the transfer adhesive reduces its bonding strength, causing glass microspheres to detach and resulting in a loss of reflective effect. Therefore, improving the water resistance and high-temperature resistance of waterborne polyurethane transfer adhesives is crucial for enhancing the durability of reflective fabrics. Summary of the Invention

[0004] The purpose of this invention is to provide a production process for a high-brightness, colorful heat-bonded reflective fabric, which solves the problems of poor water resistance and high-temperature resistance of water-based polyurethane transfer adhesive.

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

[0006] A production process for a high-brightness, colorful heat-bonded reflective fabric includes the following steps:

[0007] Step 1: Preparation of aluminized beaded film

[0008] Polyacrylate emulsion is evenly coated onto PET film, dried, and then colored glass microspheres are evenly sprinkled on it. After being rolled up, it is placed in a vacuum metallizing machine to metallize one side of the colored glass microspheres to obtain aluminized beaded film.

[0009] Step 2: Preparation of reflective fabric semi-finished product

[0010] Water-based polyurethane transfer adhesive is evenly coated onto chemical fiber cloth. After drying, the adhesive surface is laminated with the aluminized surface of the aluminized plant film to obtain a semi-finished reflective cloth.

[0011] Step 3: Mature

[0012] The prepared reflective fabric semi-finished product is placed in a drying room at 60-70℃ and baked for 48-72 hours to obtain a dazzling high-brightness heat-bonded reflective fabric.

[0013] More preferably, in the first step, the refractive index of the colored glass microspheres is 1.91-1.93 and the particle size is 40-100μm.

[0014] More preferably, in the second step, the waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 50-60 parts of long-chain aliphatic hydrocarbon modified polypropylene glycol, 5-10 parts of oxazolidinone modified polybutadiene, 20-35 parts of triphenylmethane triisocyanate, 2-3 parts of dibutyltin dilaurate, 1-5 parts of chain extender, 8-10 parts of triethylamine, 1-2 parts of aluminum powder, 0.5-1 part of antioxidant, and 10-25 parts of water.

[0015] More preferably, the chain extender is any one of 1,3-propanediol or 1,4-butanediol; and the antioxidant is any one of antioxidant 168, antioxidant 1010 or antioxidant 1076.

[0016] More preferably, the preparation method of the long-chain aliphatic hydrocarbon modified polypropylene glycol is as follows:

[0017] In a reaction flask equipped with a thermometer, polypropylene glycol diglycidyl ether and N,N-dimethylformamide were added and mixed thoroughly. The temperature was raised to 90-95°C, and then arachidonic acid and catalyst were added. The reaction was kept at this temperature for 3-4 hours. After the reaction was completed, heating was stopped, and the solvent was removed to obtain long-chain aliphatic hydrocarbon modified polypropylene glycol.

[0018] More preferably, the polypropylene glycol diglycidyl ether has an average molecular weight of 640.

[0019] More preferably, the catalyst is either potassium hydroxide or tetrabutylammonium bromide.

[0020] More preferably, the preparation method of the oxazolidinone-modified polybutadiene is as follows:

[0021] In a reaction flask equipped with a thermometer, terminal epoxy-based polybutadiene and toluene are added and mixed thoroughly. The temperature is raised to 60-80℃, and then 4-phenyloxazolidin-2-one is added. The reaction is maintained at this temperature for 3-6 hours. After the reaction is complete, the solvent is removed to obtain oxazolidinone-modified polybutadiene.

[0022] More preferably, the epoxy value of the terminally epoxy-terminated polybutadiene is 0.4-0.65 mmol / g.

[0023] More preferably, in the second step, the preparation method of the waterborne polyurethane transfer adhesive includes the following steps:

[0024] S1: In a reaction flask equipped with a thermometer, add long-chain aliphatic hydrocarbon modified polypropylene glycol, oxazolidinone modified polybutadiene, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 70-75℃, stir and react for 2-3 hours to obtain waterborne polyurethane prepolymer.

[0025] S2: Add a chain extender to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 2-4 hours, lower the temperature to 45-50℃, add triethylamine to neutralize for 5-10 minutes, then add aluminum powder, antioxidant and water, stir for 2-3 hours to obtain waterborne polyurethane transfer adhesive.

[0026] The beneficial effects of this invention are:

[0027] (1) This invention provides a production process for a high-brightness heat-bonded reflective fabric. By grafting long-chain aliphatic hydrocarbons with active methylene groups into the structure of polypropylene glycol diglycidyl ether, active hydroxyl groups are generated to obtain long-chain aliphatic hydrocarbon modified polypropylene glycol as the soft segment of polyurethane. Then, it is cross-linked with triphenylmethane triisocyanate to form a network structure. On the one hand, the active methylene groups can be oxidized and self-crosslinked in the air to form more long-chain aliphatic hydrocarbons, which has a hydrophobic effect and thus improves the water resistance of the waterborne polyurethane transfer adhesive. On the other hand, this tight network structure can effectively enhance the high-temperature resistance of the waterborne polyurethane transfer adhesive, so that the glass microspheres will not fall off during long-term washing due to the reduced adhesion of the transfer adhesive, thereby improving the durability of the reflective fabric.

[0028] (2) In this invention, 4-phenyloxazolidin-2-one is grafted onto the structure of epoxy-terminated polybutadiene to generate active hydroxyl groups, thereby obtaining oxazolidinone-modified polybutadiene, which is then used in the preparation of polyurethane. Epoxy-terminated polybutadiene can improve the mechanical properties of waterborne polyurethane transfer adhesive. After modification, the rigid structure introduced into its structure can significantly improve the high-temperature resistance of waterborne polyurethane transfer adhesive, maintain good adhesion of the transfer adhesive, prevent glass microspheres from falling off during washing, and thus ensure that the reflective fabric continues to reflect light, thereby improving the durability of the reflective fabric.

[0029] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 The infrared spectrum of long-chain aliphatic hydrocarbon-modified polypropylene glycol in Example 1 of this invention is shown.

[0032] Figure 2 The infrared spectrum of oxazolidinone-modified polybutadiene in Example 1 of this invention is shown. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] I. Preparation of Polypropylene Glycol Modified with Long-Chain Aliphatic Hydrocarbons

[0036] In a reaction flask equipped with a thermometer, 6g of polypropylene glycol diglycidyl ether with an average molecular weight of 640 and 80mL of N,N-dimethylformamide were added and mixed thoroughly. The temperature was raised to 90℃, and then 5.7g of arachidonic acid and 0.5g of potassium hydroxide were added. The reaction was kept at this temperature for 4 hours. After the reaction was completed, heating was stopped, and the solvent was removed to obtain long-chain aliphatic hydrocarbon modified polypropylene glycol.

[0037] Long-chain aliphatic hydrocarbon-modified polypropylene glycol and potassium bromide were mixed, ground, and then compressed into tablets. The tablets were then analyzed using a Spec 1mm GX infrared spectrometer in the range of 500-4000 cm⁻¹. -1 Its infrared spectrum was measured within the wavenumber range, and the results are as follows: Figure 1 As shown, long-chain aliphatic hydrocarbon-modified polypropylene glycol at 3385 cm⁻¹ -1 An absorption peak for hydroxyl groups appears at 3042 cm⁻¹. -1 An absorption peak for CH in the alkenyl group appears at 1734 cm⁻¹. -1 An absorption peak appears at the C=O group of the ester group.

[0038] II. Preparation of Oxazolidinone-Modified Polybutadiene

[0039] In a reaction flask equipped with a thermometer, 3.2 g of terminal epoxy polybutadiene with an epoxy value of 0.4 mmol / g and 50 mL of toluene were added and mixed thoroughly. The temperature was raised to 70 °C, and then 1.8 g of 4-phenyloxazolidin-2-one was added. The reaction was kept at this temperature for 5 h. After the reaction was completed, the solvent was removed to obtain oxazolidinone-modified polybutadiene.

[0040] Infrared characterization of oxazolidinone-modified polybutadiene was performed, and the results are as follows: Figure 2 As shown, oxazolidinone-modified polybutadiene at 3352 cm⁻¹ -1 An absorption peak for hydroxyl groups appears at 3037 cm⁻¹. -1 An absorption peak for CH in the benzene ring appears at 1723 cm⁻¹. -1 An absorption peak for C=O appears at this point.

[0041] III. Preparation of Waterborne Polyurethane Transfer Adhesive

[0042] The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 50 parts long-chain aliphatic hydrocarbon modified polypropylene glycol, 5 parts oxazolidinone modified polybutadiene, 20 parts triphenylmethane triisocyanate, 2 parts dibutyltin dilaurate, 2 parts 1,4-butanediol, 8 parts triethylamine, 1 part aluminum powder, 0.5 parts antioxidant 1010, and 10 parts water;

[0043] The preparation method of waterborne polyurethane transfer adhesive includes the following steps:

[0044] S1: In a reaction flask equipped with a thermometer, add long-chain aliphatic hydrocarbon modified polypropylene glycol, oxazolidinone modified polybutadiene, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 70℃, stir and react for 2 hours to obtain waterborne polyurethane prepolymer.

[0045] S2: Add 1,4-butanediol to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 2 hours, lower the temperature to 45°C, add triethylamine to neutralize for 6 minutes, then add aluminum powder, antioxidant 1010 and water, stir for 2 hours to obtain waterborne polyurethane transfer adhesive.

[0046] The long-chain aliphatic hydrocarbon-modified polypropylene glycol and oxazolidinone-modified polybutadiene prepared in this embodiment were applied to the following examples and comparative examples.

[0047] Example 2

[0048] Preparation of waterborne polyurethane transfer adhesive

[0049] The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 55 parts long-chain aliphatic hydrocarbon modified polypropylene glycol, 8 parts oxazolidinone modified polybutadiene, 25 parts triphenylmethane triisocyanate, 2 parts dibutyltin dilaurate, 3 parts 1,4-butanediol, 9 parts triethylamine, 1 part aluminum powder, 0.8 parts antioxidant 1010, and 15 parts water;

[0050] The preparation method of waterborne polyurethane transfer adhesive includes the following steps:

[0051] S1: In a reaction flask equipped with a thermometer, add long-chain aliphatic hydrocarbon modified polypropylene glycol, oxazolidinone modified polybutadiene, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 70℃, and stir for 2.5h to obtain waterborne polyurethane prepolymer.

[0052] S2: Add 1,4-butanediol to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 3 hours, lower the temperature to 50°C, add triethylamine to neutralize for 8 minutes, then add aluminum powder, antioxidant 1010 and water, stir for 2.5 hours to obtain waterborne polyurethane transfer adhesive.

[0053] Example 3

[0054] Preparation of waterborne polyurethane transfer adhesive

[0055] The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 60 parts long-chain aliphatic hydrocarbon modified polypropylene glycol, 10 parts oxazolidinone modified polybutadiene, 30 parts triphenylmethane triisocyanate, 3 parts dibutyltin dilaurate, 5 parts 1,4-butanediol, 10 parts triethylamine, 2 parts aluminum powder, 1 part antioxidant 1010, and 25 parts water;

[0056] The preparation method of waterborne polyurethane transfer adhesive includes the following steps:

[0057] S1: In a reaction flask equipped with a thermometer, add long-chain aliphatic hydrocarbon modified polypropylene glycol, oxazolidinone modified polybutadiene, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 75℃, stir and react for 3 hours to obtain waterborne polyurethane prepolymer.

[0058] S2: Add 1,4-butanediol to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 4 hours, lower the temperature to 50°C, add triethylamine to neutralize for 10 minutes, then add aluminum powder, antioxidant 1010 and water, stir for 3 hours to obtain waterborne polyurethane transfer adhesive.

[0059] Comparative Example 1

[0060] Preparation of waterborne polyurethane transfer adhesive

[0061] The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 60 parts polypropylene glycol diglycidyl ether, 10 parts oxazolidinone-modified polybutadiene, 30 parts triphenylmethane triisocyanate, 3 parts dibutyltin dilaurate, 5 parts 1,4-butanediol, 10 parts triethylamine, 2 parts aluminum powder, 1 part antioxidant 1010, and 25 parts water;

[0062] The preparation method of waterborne polyurethane transfer adhesive includes the following steps:

[0063] S1: In a reaction flask equipped with a thermometer, add polypropylene glycol diglycidyl ether, oxazolidinone-modified polybutadiene, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 75°C, stir and react for 3 hours to obtain waterborne polyurethane prepolymer.

[0064] S2: Add 1,4-butanediol to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 4 hours, lower the temperature to 50°C, add triethylamine to neutralize for 10 minutes, then add aluminum powder, antioxidant 1010 and water, stir for 3 hours to obtain waterborne polyurethane transfer adhesive.

[0065] Comparative Example 2

[0066] Preparation of waterborne polyurethane transfer adhesive

[0067] The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 60 parts long-chain aliphatic hydrocarbon modified polypropylene glycol, 30 parts triphenylmethane triisocyanate, 3 parts dibutyltin dilaurate, 5 parts 1,4-butanediol, 10 parts triethylamine, 2 parts aluminum powder, 1 part antioxidant 1010, and 25 parts water.

[0068] The preparation method of waterborne polyurethane transfer adhesive includes the following steps:

[0069] S1: In a reaction flask equipped with a thermometer, add long-chain aliphatic hydrocarbon modified polypropylene glycol, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 75℃, stir and react for 3 hours to obtain waterborne polyurethane prepolymer.

[0070] S2: Add 1,4-butanediol to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 4 hours, lower the temperature to 50°C, add triethylamine to neutralize for 10 minutes, then add aluminum powder, antioxidant 1010 and water, stir for 3 hours to obtain waterborne polyurethane transfer adhesive.

[0071] Comparative Example 3

[0072] Preparation of waterborne polyurethane transfer adhesive

[0073] The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 60 parts polypropylene glycol diglycidyl ether, 30 parts isophorone diisocyanate, 3 parts dibutyltin dilaurate, 5 parts 1,4-butanediol, 10 parts triethylamine, 2 parts aluminum powder, 1 part antioxidant 1010, and 25 parts water.

[0074] The preparation method of waterborne polyurethane transfer adhesive includes the following steps:

[0075] S1: In a reaction flask equipped with a thermometer, add polypropylene glycol diglycidyl ether, isophorone diisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 75°C, stir and react for 3 hours to obtain waterborne polyurethane prepolymer.

[0076] S2: Add 1,4-butanediol to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 4 hours, lower the temperature to 50°C, add triethylamine to neutralize for 10 minutes, then add aluminum powder, antioxidant 1010 and water, stir for 3 hours to obtain waterborne polyurethane transfer adhesive.

[0077] Performance testing

[0078] a. Water resistance tests were conducted on the waterborne polyurethane transfer adhesives prepared in Examples 1-3 and Comparative Examples 1-3 above:

[0079] The prepared waterborne polyurethane transfer adhesive was coated onto a polytetrafluoroethylene plate to a thickness of 50 μm, allowing it to form a film naturally. The plate was then vacuum-dried at 60 °C for 20 h. The film was cut into 3 cm × 3 cm samples, and the mass M1 (g) of each sample was weighed. The samples were then soaked in water for 24 h, removed, dried, and weighed again to determine the water absorption rate.

[0080]

[0081] The lower the water absorption rate, the better the water resistance of the water-based polyurethane transfer adhesive. The test results are shown in the table below:

[0082] Water absorption rate X (%) Example 1 5.6 Example 2 5.3 Example 3 5.7 Comparative Example 1 18.5 Comparative Example 2 6.4 Comparative Example 3 19.1

[0083] As shown in the table above, the waterborne polyurethane transfer adhesives prepared in Examples 1-3 have good water resistance. The waterborne polyurethane transfer adhesive prepared in Comparative Example 2 has good water resistance because it contains long-chain aliphatic hydrocarbon-modified polypropylene glycol, which has a hydrophobic effect. The waterborne polyurethane transfer adhesives prepared in Comparative Examples 1 and 3 have high water absorption rates. Since long-chain aliphatic hydrocarbon-modified polypropylene glycol was not added during the preparation of the waterborne polyurethane transfer adhesive, it could not play a water-resistant role and therefore had poor water resistance.

[0084] b. Referring to the national standard GB / T7124-2008 "Determination of Tensile Shear Strength of Adhesives", the tensile shear strength of the waterborne polyurethane transfer adhesives prepared in Examples 1-3 and Comparative Examples 1-3 above was tested:

[0085]

[0086]

[0087] As shown in the table above, the waterborne polyurethane transfer adhesives prepared in Examples 1-3 have good mechanical properties. The waterborne polyurethane transfer adhesive prepared in Comparative Example 1 also has good mechanical properties due to the addition of oxazolidinone-modified polybutadiene. However, the waterborne polyurethane transfer adhesives prepared in Comparative Examples 2 and 3 have lower tensile shear strength and poorer mechanical properties because they do not contain oxazolidinone-modified polybutadiene, which can improve the mechanical properties of waterborne polyurethane transfer adhesives.

[0088] c. High-temperature resistance tests were conducted on the waterborne polyurethane transfer adhesives prepared in Examples 1-3 and Comparative Examples 1-3.

[0089] The prepared waterborne polyurethane transfer adhesive was coated onto a transparent PET film and dried to form a 20 μm adhesive layer, thus producing an adhesive tape. Referring to the national standard GB / T2792-2014 "Test Method for Peel Strength of Adhesive Tapes", the peel strength P1 (N / cm) of the waterborne polyurethane transfer adhesive was tested. The prepared tape was then heat-treated at 120℃ for 6 hours, and the peel strength P2 (N / cm) was tested again. The peel strength retention rate K was calculated as K = P2 / P1 × 100%. A higher peel strength retention rate indicates better high-temperature resistance of the waterborne polyurethane transfer adhesive. The test results are shown in the table below:

[0090]

[0091]

[0092] As shown in the table above, the waterborne polyurethane transfer adhesives prepared in Examples 1-3 have excellent high-temperature resistance. The waterborne polyurethane transfer adhesive prepared in Comparative Example 1 also has a high peel strength retention rate, thus its high-temperature resistance is also good. However, the peel strength retention rate of the waterborne polyurethane transfer adhesive prepared in Comparative Example 2 is significantly reduced because no oxazolidinone-modified polybutadiene with a rigid structure was added during the preparation of the waterborne polyurethane transfer adhesive, resulting in relatively poor high-temperature resistance. The waterborne polyurethane transfer adhesive prepared in Comparative Example 3 has the lowest peel strength retention rate because the waterborne polyurethane transfer adhesive does not form a network structure, thus its high-temperature resistance is the worst.

[0093] The aqueous polyurethane transfer adhesive prepared in Example 2 was used to prepare a high-gloss, colorful heat-bonded reflective fabric. The production process includes the following steps:

[0094] Step 1: Preparation of aluminized beaded film

[0095] Polyacrylate emulsion is evenly coated onto PET film, dried, and then evenly sprinkled with colored glass microspheres with a refractive index of 1.93 and a particle size of 100μm. After being rolled up, it is placed in a vacuum metallizing machine to metallize one side of the colored glass microspheres to obtain aluminized beaded film.

[0096] Step 2: Preparation of reflective fabric semi-finished product

[0097] Water-based polyurethane transfer adhesive is evenly coated onto chemical fiber cloth. After drying, the adhesive surface is laminated with the aluminized surface of the aluminized plant film to obtain a semi-finished reflective cloth.

[0098] Step 3: Mature

[0099] The prepared reflective fabric semi-finished product was placed in a drying room at 70℃ and baked for 48 hours to obtain a dazzling high-brightness heat-bonded reflective fabric.

[0100] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0101] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A production process for a high-brightness, multi-colored heat-bonded reflective fabric, characterized in that, Includes the following steps: Step 1: Preparation of aluminized beaded film Polyacrylate emulsion is evenly coated onto PET film, dried, and then colored glass microspheres are evenly sprinkled on it. After being rolled up, it is placed in a vacuum metallizing machine to metallize one side of the colored glass microspheres to obtain aluminized beaded film. Step 2: Preparation of reflective fabric semi-finished product Water-based polyurethane transfer adhesive is evenly coated onto chemical fiber cloth. After drying, the adhesive surface is laminated with the aluminized surface of the aluminized plant film to obtain a semi-finished reflective cloth. Step 3: Mature The prepared reflective fabric semi-finished product is placed in a drying room at 60-70℃ and baked for 48-72 hours to obtain a dazzling high-brightness heat-bonded reflective fabric. The waterborne polyurethane transfer adhesive comprises the following raw materials in parts by weight: 50-60 parts long-chain aliphatic hydrocarbon modified polypropylene glycol, 5-10 parts oxazolidinone modified polybutadiene, 20-35 parts triphenylmethane triisocyanate, 2-3 parts dibutyltin dilaurate, 1-5 parts chain extender, 8-10 parts triethylamine, 1-2 parts aluminum powder, 0.5-1 part antioxidant, and 10-25 parts water; The specific preparation method of the oxazolidinone-modified polybutadiene is as follows: In a reaction flask equipped with a thermometer, terminal epoxy-based polybutadiene and toluene are added and mixed thoroughly. The temperature is raised to 60-80℃, and then 4-phenyloxazolidin-2-one is added. The reaction is maintained at this temperature for 3-6 hours. After the reaction is complete, the solvent is removed to obtain oxazolidinone-modified polybutadiene.

2. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 1, characterized in that, In the first step, the colored glass microspheres have a refractive index of 1.91-1.93 and a particle size of 40-100 μm.

3. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 1, characterized in that, The chain extender is any one of 1,3-propanediol or 1,4-butanediol; the antioxidant is any one of antioxidant 168, antioxidant 1010 or antioxidant 1076.

4. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 1, characterized in that, The specific preparation method of the long-chain aliphatic hydrocarbon modified polypropylene glycol is as follows: In a reaction flask equipped with a thermometer, polypropylene glycol diglycidyl ether and N,N-dimethylformamide were added and mixed thoroughly. The temperature was raised to 90-95°C, and then arachidonic acid and catalyst were added. The reaction was kept at this temperature for 3-4 hours. After the reaction was completed, heating was stopped, and the solvent was removed to obtain long-chain aliphatic hydrocarbon modified polypropylene glycol.

5. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 4, characterized in that, The average molecular weight of the polypropylene glycol diglycidyl ether is 640.

6. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 4, characterized in that, The catalyst is either potassium hydroxide or tetrabutylammonium bromide.

7. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 1, characterized in that, The epoxy value of the terminally epoxy-terminated polybutadiene is 0.4-0.65 mmol / g.

8. The production process of a high-brightness, multi-colored heat-bonded reflective fabric according to claim 1, characterized in that, In the second step, the preparation method of the waterborne polyurethane transfer adhesive includes the following steps: S1: In a reaction flask equipped with a thermometer, add long-chain aliphatic hydrocarbon modified polypropylene glycol, oxazolidinone modified polybutadiene, triphenylmethane triisocyanate and dibutyltin dilaurate, stir evenly, raise the temperature to 70-75℃, stir and react for 2-3 hours to obtain waterborne polyurethane prepolymer. S2: Add a chain extender to the waterborne polyurethane prepolymer prepared in step S1, continue the reaction for 2-4 hours, lower the temperature to 45-50℃, add triethylamine to neutralize for 5-10 minutes, then add aluminum powder, antioxidant and water, stir for 2-3 hours to obtain waterborne polyurethane transfer adhesive.

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