Melamine resin stiffening finishing process

Abstract

The invention relates to the technical field of fabric stiffening finishing, in particular to a melamine resin stiffening finishing process. The method comprises the following steps: pretreatment: washing a to-be-treated fabric with washing powder, and then rinsing with clear water; a working solution is prepared, and a catalyst is added into a melamine resin stiffening agent, so that the subsequent stiffening agent takes effect conveniently; padding: soaking the fabric to be finished, taking out the fabric after soaking, and rolling the soaked fabric through a padder; pre-drying: pre-drying the padded fabric at a high temperature to remove part of moisture; baking: continuously baking at a high temperature, removing the rest of water, and curing the melamine resin in the fabric; after-treatment, the finished fabric is cleaned and dried, subsequent packaging is facilitated, the formaldehyde concentration data of the cloth cover is obtained through experimental inspection, the reliable formaldehyde removal effect is further proved, the purpose of reducing formaldehyde is achieved, and meanwhile the fabric treated through the finishing process is free of peculiar smell.

Description

Technical Field

[0001] The invention relates to the technical field of fabric stiffening finishing, and in particular to a melamine resin stiffening finishing process. Background Art

[0002] As a fabric stiffener, melamine resin has the function of enhancing the stiffness and shape stability of the fabric, making the fabric stiff and stylish. In addition, it can also improve the washability and wear resistance of the fabric, making the fabric less likely to deform. At the same time, melamine resin can improve the wrinkle resistance of the fabric, maintain a smooth appearance, and increase the texture and gloss of the fabric. Therefore, it is suitable for stiffening finishing of a variety of fabrics, especially after finishing polyester fabrics, the stiffening effect is better, and the thickness and elasticity are better.

[0003] In the prior art, melamine resin is a common stiffening finishing agent, which is often used in the field of fabric processing such as bags, curtains, and linings. However, most fabrics finished with melamine resin have free formaldehyde on the surface, which makes the formaldehyde concentration on the fabric surface relatively high, and subsequent treatment is often required to reduce the formaldehyde concentration on the fabric surface. In addition, ammonium chloride and ammonium sulfate, which are catalysts, will make the fabric have a strong fishy smell if the baking temperature is too high and the baking time is too long, making the fabric harmful to human health. The use of the fabric in some confined spaces will also be subject to certain restrictions. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention solves the technical problems by adopting a technical solution: a melamine resin stiffening finishing process, comprising the following steps: Step 1: Pretreatment: Wash 10 kg of fabric with washing powder, and then rinse the fabric surface with clean water; Step 2, prepare the working solution: mix 500-1000g of melamine resin stiffener and 50-100g of mixed catalyst to prepare the working solution, and gradually add citric acid to the working solution, adjust the pH value of the working solution to 6.5-7, and wait for subsequent use; Step 3, padding: immerse the fabric in the prepared working solution, then take out the fabric that has been soaked for 10 minutes, and use a padder to roll the soaked fabric; Step 4: Pre-drying: Pre-dry the impregnated fabric at 100-150 degrees Celsius to remove some moisture; Step 5: Baking: Baking at 185-190 degrees Celsius for 15-45 seconds. Step 6: Post-treatment: Wash the finished fabric three times and dry it after washing.

[0005] The present invention is further configured such that the mass of the melamine resin stiffener in step 2 is 1000 g.

[0006] The present invention is further configured that the components of the mixed catalyst in step 2 are ammonium chloride, ammonium sulfate, magnesium chloride, zinc nitrate, and zinc chloride, and the weight ratio is 1:1:1:2:1, and the mass of the mixed catalyst added is 100g The present invention is further configured that the pH value adjusted in step 2 is 6.8; The present invention is further configured such that the pre-drying temperature in step 4 is 120 degrees Celsius; The present invention is further configured such that the baking temperature in step five is 190 degrees Celsius and the baking time is 30 seconds.

[0007] The beneficial effects of the present invention are as follows: The present invention changes the catalyst component used in the melamine resin in the traditional technology, thereby changing the process flow of the melamine resin stiffener for stiffening the fabric. Through lemon adjustment, the finished fabric has no fishy smell, which greatly improves the use experience of the fabric and prevents it from emitting an unpleasant odor during wearing or use, thereby increasing consumer acceptance and satisfaction. Secondly, the formaldehyde concentration on the fabric surface is lower than 300 ppm, which reduces the potential harm of free formaldehyde to human health, making the fabric more environmentally friendly and safe, and reducing the risk of allergies and irritation for people with sensitive skin, and can better meet environmental protection standards and quality requirements. The improvement of the process ensures that the fabric can protect the health of consumers after finishing, and also improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a flow chart of the present invention; Figure 2 It is an experimental data diagram of the present invention. DETAILED DESCRIPTION

[0009] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0010] Example 1: Please refer to Figure 1 - Figure 2 The present invention provides a technical solution: a melamine resin stiffening finishing process, comprising the following steps: Step 1: Pretreatment: Wash 10 kg of fabric with washing powder, and then rinse the fabric surface with clean water; Step 2, prepare the working solution: mix 500-1000g of melamine resin stiffener and 50-100g of mixed catalyst to prepare the working solution, and gradually add citric acid to the working solution, adjust the pH value of the working solution to 6.5-7, and wait for subsequent use; Further, the mass of the melamine resin stiffener in step 2 is 1000g; Furthermore, the components of the mixed catalyst in step 2 are ammonium chloride, ammonium sulfate, magnesium chloride, zinc nitrate, and zinc chloride, and the weight ratio is 1:1:1:2:1, and the mass of the mixed catalyst added is 100g; Further, the pH value adjusted in step 2 is 6.8; Step 3, padding: immerse the fabric in the prepared working solution, then take out the fabric that has been soaked for 10 minutes, and use a padder to roll the soaked fabric; Step 4: Pre-drying: Pre-dry the impregnated fabric at 100-150 degrees Celsius to remove some moisture; Furthermore, the pre-drying temperature in step 4 is 120 degrees Celsius; Step 5: Baking: Baking at 185-190 degrees Celsius for 15-45 seconds. Furthermore, the baking temperature in step 5 is 190 degrees Celsius and the baking time is 30 seconds. Step 6: Post-treatment: Wash the finished fabric three times and dry it after washing.

[0011] Example 2: Please refer to Figure 1 - Figure 2 The present invention provides a technical solution: based on the first embodiment, the technical solution includes the following steps: Step 1: Pretreatment: Wash 10 kg of fabric with washing powder, and then rinse the fabric surface with clean water; Step 2, prepare the working solution: mix 500-1000g of melamine resin stiffener and 50-100g of mixed catalyst to prepare the working solution, and gradually add citric acid to the working solution, adjust the pH value of the working solution to 6.5-7, and wait for subsequent use; Further, the mass of the melamine resin stiffener in step 2 is 1000g; Furthermore, the components of the mixed catalyst in step 2 are ammonium chloride, ammonium sulfate, magnesium chloride, zinc nitrate, and zinc chloride, and the weight ratio is 2:2:2:2:1, and the mass of the mixed catalyst added is 100g; Further, the pH value adjusted in step 2 is 6.8; Step 3, padding: immerse the fabric in the prepared working solution, then take out the fabric that has been soaked for 10 minutes, and use a padder to roll the soaked fabric; Step 4: Pre-drying: Pre-dry the impregnated fabric at 100-150 degrees Celsius to remove some moisture; Furthermore, the pre-drying temperature in step 4 is 120 degrees Celsius; Step 5: Baking: Baking at 185-190 degrees Celsius for 15-45 seconds. Furthermore, the baking temperature in step 5 is 190 degrees Celsius and the baking time is 30 seconds; Step 6: Post-treatment: Wash the finished fabric three times and dry it after washing.

[0012] Example 3: Please refer to Figure 1 - Figure 2 The present invention provides a technical solution: based on the first embodiment, the technical solution includes the following steps: Step 1: Pretreatment: Wash 10 kg of fabric with washing powder, and then rinse the fabric surface with clean water; Step 2, prepare the working solution: mix 500-1000g of melamine resin stiffener and 50-100g of mixed catalyst to prepare the working solution, and gradually add citric acid to the working solution, adjust the pH value of the working solution to 6.5-7, and wait for subsequent use; Further, the mass of the melamine resin stiffener in step 2 is 1000g; Furthermore, the components of the mixed catalyst in step 2 are ammonium chloride, ammonium sulfate, magnesium chloride, zinc nitrate, and zinc chloride, and the weight ratio is 1:1:1:2:1, and the mass of the mixed catalyst added is 100g; Further, the pH value adjusted in step 2 is 6.8; Step 3, padding: immerse the fabric in the prepared working solution, then take out the fabric that has been soaked for 10 minutes, and use a padder to roll the soaked fabric; Step 4: Pre-drying: Pre-dry the impregnated fabric at 100-150 degrees Celsius to remove some moisture; Furthermore, the pre-drying temperature in step 4 is 150 degrees Celsius; Step 5: Baking: Baking at 185-190 degrees Celsius for 15-45 seconds. Furthermore, the baking temperature in step 5 is 190 degrees Celsius and the baking time is 45 seconds; Step 6: Post-treatment: Wash the finished fabric three times and dry it after washing.

[0013] Example 4: Please refer to Figure 1 - Figure 2 The present invention provides a technical solution, comprising the following steps: Step 1: Pretreatment: Wash 10 kg of fabric with washing powder, and then rinse the fabric surface with clean water; Step 2, prepare the working solution: mix 500-1000g of melamine resin stiffener and 50-100g of mixed catalyst to prepare the working solution, and gradually add citric acid to the working solution, adjust the pH value of the working solution to 6.5-7, and wait for subsequent use; Further, the mass of the melamine resin stiffener in step 2 is 1000g; Furthermore, the components of the mixed catalyst in step 2 are ammonium chloride and ammonium sulfate in a weight ratio of 1:1, and the mass of the mixed catalyst added is 100g; Further, the pH value adjusted in step 2 is 6.8; Step 3, padding: immerse the fabric in the prepared working solution, then take out the fabric that has been soaked for 10 minutes, and use a padder to roll the soaked fabric; Step 4: Pre-drying: Pre-dry the impregnated fabric at 100-150 degrees Celsius to remove some moisture; Furthermore, the pre-drying temperature in step 4 is 150 degrees Celsius; Step 5: Baking: Baking at 185-190 degrees Celsius for 15-45 seconds. Furthermore, the baking temperature in step 5 is 190 degrees Celsius and the baking time is 45 seconds; Step 6: Post-treatment: Wash the finished fabric three times and dry it after washing.

[0014] Experimental testing: The fabrics were finished according to the methods of Example 1, Example 2, Example 3 and Example 4, and the fabrics obtained by the methods of Example 1, Example 2, Example 3 and Example 4 were used as experimental objects for detection, and were named Experimental Group 1, Experimental Group 2, Experimental Group 3 and Control Group. The control group used a finishing process with traditional technology. The detection was performed by spectrophotometry. The formaldehyde gas on the surfaces of the three groups of experimental objects was collected, absorbed by water, and dissolved in an acetic acid-ammonium acetate buffer solution with a pH value of 6. Formaldehyde reacted with acetylacetone to rapidly generate a stable yellow compound under boiling water bath conditions. The absorbance was measured at a wavelength of 413 nm to determine the formaldehyde concentration. At the same time, a formaldehyde detector was used to assist in the measurement to reduce experimental errors. The relevant data are recorded in Figure 2 Since there is a certain amount of free formaldehyde in melamine resin, and these free formaldehydes will slowly volatilize when melamine resin is used as a stiffening agent, the volatilized formaldehyde will separate from the melamine resin, causing the formaldehyde concentration on the fabric surface to increase. Figure 2 By comparing the data of the experimental group and the control group, it can be concluded that controlling the time and temperature during drying and baking, as well as adjusting the catalyst composition, can effectively reduce the free formaldehyde content. Due to the high heating temperature and long heating time, the fishy smell is produced. Compared with the experimental group 3 and the control group, the heating time and heating stability of the experimental group 1 and the experimental group 2 are relatively lower, so the fishy smell produced by the experimental group 1 and the experimental group 2 is lower. The experimenters used the fan smell method to prove that the experimental group 1 and the experimental group 2 had no obvious odor. Figure 2 It was found that compared with Experimental Group 1 and Experimental Group 2, the catalyst ratio was optimized, and the free formaldehyde was fixed through condensation reaction, thereby lowering the formaldehyde concentration on the cloth surface to less than 300ppm, so that the finished fabric was within a safe range.

[0015] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A melamine resin stiffening finishing process, characterized in that: The following steps are involved: Step 1: Pretreatment: Wash 10 kg of fabric with washing powder, and then rinse the fabric surface with clean water; Step 2, prepare the working solution: mix 500-1000g of melamine resin stiffener and 50-100g of mixed catalyst to prepare the working solution, and gradually add citric acid to the working solution, adjust the pH value of the working solution to 6.5-7, and wait for subsequent use; Step 3, padding: immerse the fabric in the prepared working solution, then take out the fabric that has been soaked for 10 minutes, and use a padder to roll the soaked fabric; Step 4: Pre-drying: Pre-dry the impregnated fabric at 100-150 degrees Celsius to remove some moisture; Step 5: Baking: Baking at 185-190 degrees Celsius for 15-45 seconds. Step 6: Post-treatment: Wash the finished fabric three times and dry it after washing.

2. A melamine resin stiffening finishing process according to claim 1, characterized in that: The mass of the melamine resin stiffener in step 2 is 1000g.

3. A melamine resin stiffening finishing process according to claim 1, characterized in that: The components of the mixed catalyst in step 2 are ammonium chloride, ammonium sulfate, magnesium chloride, zinc nitrate and zinc chloride, and the weight ratio is 1:1:1:2:

1. The mass of the mixed catalyst added is 100g.

4. A melamine resin stiffening finishing process according to claim 1, characterized in that: The pH value adjusted in the step 2 is 6.

8.

5. A melamine resin stiffening finishing process according to claim 1, characterized in that: The pre-drying temperature in step 4 is 120 degrees Celsius.

6. A melamine resin stiffening finishing process according to claim 1, characterized in that: The baking temperature in step 5 is 190 degrees Celsius and the baking time is 30 seconds.

Images