CN104278456B - Electrostatic spraying method of anti-ultraviolet fabrics - Google Patents

Abstract

The invention provides an electrostatic spraying method for anti-ultraviolet textiles, which relates to the technical field of textile materials. The preparation method comprises the following steps: 1. Perform low-temperature plasma surface treatment on the fabric, the low-temperature plasma treatment power is 100-500W, and the treatment time is 10 ～90min, adjust the humidity of the fabric to 70～100%; 2. Prepare an electrospray solution with anti-ultraviolet properties; 3. Put the fabric facing the injection needle spray port of the high-voltage electrostatic spraying equipment, and the distance between the fabric and the injection needle spray port is 10 to 30 cm, the electrospray solution is evenly loaded on the surface of the fabric; 4. Dry the treated fabric for 5 to 30 minutes, and finally obtain an anti-ultraviolet textile. Compared with the prior art, the present invention has the advantages that: the flexural rigidity of the fabric is increased by 10-20%, the drape coefficient is increased by 3-10%, after being washed 10 times with water, the UPF>40, and the average UVA transmittance<5 %, and the process equipment is simple, the operation is convenient, the process parameters are easy to control, the cost is low, and it is suitable for industrial production.

Description

A kind of electrostatic spraying method of anti-ultraviolet textile

technical field

The invention relates to the technical field of textile materials, in particular to an electrostatic spraying method for anti-ultraviolet textiles.

Background technique

With the development of science and technology and the continuous progress of society, the environmental pollution caused by industrial production has caused the destruction of the atmospheric ozone layer, and the harm caused by ultraviolet radiation to people's health has become increasingly significant. Long-term ultraviolet radiation will accelerate skin aging and produce pigmentation. Even reduce the body's immunity, resulting in skin cancer. With the continuous improvement of people's living standards, the anti-ultraviolet properties of textiles have attracted more and more attention, and the development of anti-ultraviolet textiles has become an important research direction.

Chinese patent application CN102995406B discloses a preparation method of an anti-ultraviolet coating, which comprises the following steps: (1) adding 4-12% nano-titanium dioxide, 0.5-2% talcum powder and 2-6% benzotriazole into a mixer and stirring uniform; (2) add an appropriate amount of acetone to the mixture of step (1) and make the dispersion uniform; (3) add 5-15% polyethylene glycol to the mixture of step (2), and stir evenly; (4) add Make up the acetone to 100%, and stir evenly to get the finished product. Treating fabric with the anti-ultraviolet coating that the present invention makes can not significantly change the feel of fabric, and makes the ultraviolet transmittance of fabric lower than 8%, but the shortcoming of the present invention is that solid nano-titanium dioxide is because of its own specific surface area It is not easy to disperse evenly when mixing, and it is easy to agglomerate. Moreover, when using this coating, the coating is sprayed on the surface of the fabric, and it cannot be guaranteed that it can be sprayed evenly on the surface of the fabric with a complex structure.

Chinese patent application CN102321974B discloses a preparation method of super-hydrophobic anti-ultraviolet textiles. Firstly, the surface of the fabric is pretreated; roughness; finally, the textiles loaded with core-shell structure particles are treated with low surface energy substances. The textiles prepared by this method have a contact angle of more than 150° with water droplets, have stable superhydrophobic properties, and have excellent ultraviolet protection properties, but the disadvantage of this method is that the polydimethyldiallyl The ammonium chloride solution loads the core-shell structure composite particles with ultraviolet absorption on the surface of the fabric. The steps are tedious and complicated, and the uniformity of the composite particles cannot be guaranteed.

At present, most of the textile products with anti-ultraviolet properties on the market are added with anti-ultraviolet finishing agents during dyeing or setting, and the fabrics are subjected to anti-ultraviolet finishing through padding, baking and other processes. Although this processing method can obtain certain The fabric of anti-ultraviolet performance, but the feel of the fabric after finishing and performance such as anti-ultraviolet durability are relatively poor, so a kind of preparation method of the anti-ultraviolet textile with good feel is urgently needed on the market.

Contents of the invention

In order to solve the problems in the prior art that anti-ultraviolet textiles have poor hand feel and anti-ultraviolet durability, the invention provides an electrostatic spraying method for anti-ultraviolet textiles with simple process method and convenient operation.

Electrostatic spraying is a method in which high-voltage static electricity is used to establish an electrostatic field between the nozzle and the target, and after the solution flows through the nozzle and is atomized, under the action of the electrostatic field force, the droplets make directional movement and are adsorbed on the target. It has uniform droplet size , good deposition performance, etc., so it is widely used in agriculture, industry and other fields. The present invention provides a new idea, using its characteristics to achieve the purpose of fabric surface modification. In order to achieve the above purpose, the present invention adopts the following technologies Scheme: a method for electrostatic spraying of anti-ultraviolet textiles, the preparation method comprising the steps of:

Step 1: Perform low-temperature plasma surface treatment on the fabric, the low-temperature plasma treatment power is 100-500W, the treatment time is 10-90min, and the fabric humidity is adjusted to 70-100%;

Step 2: preparing an electrospray solution with anti-ultraviolet properties;

Step 3: The fabric treated in step (1) is facing the injection needle spray port of the high-voltage electrostatic spraying equipment. The distance between the fabric and the injection needle spray port is 10-30 cm, and the electrospray solution obtained in step (2) is evenly loaded On the surface of the fabric, the flow rate of the electrospray solution is 0.2-2.0mL/h, the voltage is 8-30kV, and the receiving time is 15-90min;

Step 4: drying the textile obtained in step (3) for 5-30 minutes, and finally obtaining an anti-ultraviolet textile.

The electrospray solution is a TiO ₂ sol composed of TiO ₂ , deionized water and ethanol, wherein the mass percentage of TiO ₂ is 0.5-1.5%.

The invention adopts plasma to modify the surface of the fabric, can process the fabric with complex shape, has good surface treatment uniformity of the fabric, and improves the surface performance of the material without affecting its basic performance.

The use of high-voltage electrostatic spraying can make the electrospray liquid have uniform droplet size, good deposition performance, small drift loss, and uniform distribution of fog groups, so it can be evenly arranged on the fabric, with high efficiency and simple method.

Choosing TiO ₂ sol as the electrospray solution not only retains the advantages of small particle size and strong ultraviolet absorption ability of nano-TiO ₂ , but also has incomparable affinity for solid materials such as TiO ₂ powder and film.

The present invention has the following beneficial effects:

(1) The textiles obtained by the present invention have good hand feeling, the bending rigidity is increased by 10-20%, and the drape coefficient is increased by 3-10%;

(2) The textiles obtained by the present invention have better anti-ultraviolet properties, and still meet GB/T18830-2009 "Assessment of Anti-ultraviolet Properties of Textiles" after washing for 10 times, that is, UPF>40, UVA average transmittance<5%;

(3) With this method, the drying is fast, and the general drying time can be completed within 5 to 30 minutes;

(4) The process equipment is simple, the operation is convenient, the process parameters are easy to control, the cost is low, and it is suitable for industrial production.

detailed description

In order to further understand the present invention, the present invention is further described in conjunction with the following examples.

According to the present invention, the low-temperature plasma treatment equipment can choose any equipment that is conventionally operated in this field. As a preference, use Changzhou Zhongke Changtai Plasma Technology Co., Ltd., HD-1B cold plasma modification equipment; moisture permeability test It is preferred to use Wenzhou Jigao Testing Instrument Co., Ltd., YG(B)216-Ⅱ fabric moisture permeability meter; the high-voltage electrostatic spray equipment is preferably Shenzhen Tongli Micro-Nano Technology Co., Ltd., TL-Pro high-voltage electrostatic spinning machine, for the above equipment The choice of the present invention is not particularly limited in this regard.

Performance test equipment and model:

Example 1:

Step 1: Pretreat the fabric to be sprayed with low-temperature plasma, with a treatment power of 150W and a treatment time of 20 minutes. The humidity of the fabric measured by the YG(B)216-II fabric moisture permeability meter is 90%.

Step 2: Prepare a TiO ₂ electrospray solution, the TiO ₂ sol is 0.5wt%, if the sol is still clear and transparent after 24 hours of storage, and there is no layering or precipitation, it can be considered that the sol is uniformly dispersed and the system is stable. The TiO ₂ sol is used as the electrospray solution because the dispersion uniformity of the TiO ₂ powder in the solution is not high, and it is easy to coalesce and settle for a long time, and the TiO ₂ sol itself is a uniform dispersion system of nano-TiO ₂ particles, which has other forms Unmatched affinity for TiO ₂ materials.

Step 3: Place the fabric facing the injection needle spray port of the high-voltage electrostatic spraying equipment. The distance between the fabric and the injection needle spray port is 15 cm. The electrospray solution is atomized into micron or nano particles and evenly loaded on the surface of the fabric. The flow rate of the high-voltage electrostatic spray solution is 1.0mL/h, the voltage is 12kV, and the receiving time is 20min.

Step 4: drying the textile obtained in step 3 for 10 minutes, and finally obtaining an anti-ultraviolet textile.

The hand feel of the fabric is mainly evaluated by the stiffness test and the drape test. The bending stiffness of the fabric increases by 12%, and the drape coefficient increases by 3.5%. According to the air permeability test standard: GB/T5453-1997, the air permeability test is carried out , the air permeability of the fabric is only reduced by 6.4%; its anti-ultraviolet durability test is carried out after being exposed to the sun for 100 hours on the ATLAS-150S light fastness meter, and it is tested on the YG(B)912E textile anti-ultraviolet performance tester. The fabric UPF , UVA and UVB were 48, 3.27% and 4.08% respectively; after 100h exposure to the sun, UPF, UVA and UVB were 43, 4.12% and 4.83% respectively; after washing 10 times, UPF, UVA and UVB were 40, 4.35% and 5.06%.

Example 2:

Step 1: Pretreat the fabric to be sprayed with low-temperature plasma, the treatment power is 250W, the treatment time is 10min, and the humidity of the fabric is 80% as measured by the YG(B)216-II fabric moisture permeability meter.

Step 2: prepare _TiO2 electrospray solution, the concentration of _TiO2 sol is 0.8wt%;

Step 3: Put the fabric facing the injection needle spray port of the high-voltage electrostatic spraying equipment. The distance between the fabric and the injection needle spray port is 10cm. The electrospray solution is atomized into micron or nanometer particles and evenly loaded on the surface of the fabric. The flow rate of the high-voltage electrostatic spray solution is 0.5mL/h, the voltage is 20kV, and the receiving time is 15min;

Step 4: drying the textile obtained in step 3 for 20 minutes, and finally obtaining an anti-ultraviolet textile.

The hand feel of the fabric is mainly evaluated through the stiffness test and the drape test. The flexural rigidity of the fabric is increased by 15%, and the drape coefficient is increased by 5.6%. Reduced by 8.5%; After being exposed to the sun for 100h on the ATLAS-150S light fastness meter, its anti-ultraviolet durability test was carried out, and the YG (B) 912E type textile anti-ultraviolet performance tester was tested, and the fabric UPF, UVA and UVB were respectively 55, 3.27% and 4.08%; after 100 hours of sun exposure, UPF, UVA and UVB were 48, 4.12% and 5.06% respectively; after washing 10 times, UPF, UVA and UVB were 45, 4.36% and 4.83% respectively.

Example 3:

Step 1: Pretreat the fabric to be sprayed with low-temperature plasma, the treatment power is 450W, the treatment time is 30min, and the humidity of the fabric is 70% as measured by the YG(B)216-II fabric moisture permeability meter.

Step 2: prepare _TiO2 electrospray solution, the concentration of _TiO2 sol is 1.5wt%;

Step 3: Put the fabric facing the injection needle spray port of the high-voltage electrostatic spraying equipment. The distance between the fabric and the injection needle spray port is 20cm. The electrospray solution is atomized into micron or nanometer particles and evenly loaded on the surface of the fabric. The flow rate of the high-voltage electrostatic spray solution is 0.3mL/h, the voltage is 20kV, and the receiving time is 20min;

Step 4: Drying the textile obtained in step 3 for 30 minutes to obtain an anti-ultraviolet textile.

The hand feel of the fabric is mainly evaluated through the stiffness test and the drape test. The bending stiffness of the fabric is increased by 16%, and the drape coefficient is increased by 6.8%. Reduced by 9.2%; After being exposed to the sun for 100h on the ATLAS-150S light fastness meter, its anti-ultraviolet durability test was carried out, and the YG (B) 912E type textile anti-ultraviolet performance tester was tested, and the fabric UPF, UVA and UVB were respectively 59, 3.27% and 4.08%; after 100 hours of sun exposure, UPF, UVA and UVB were 52, 3.05% and 3.46% respectively; after washing 10 times, UPF, UVA and UVB were 47, 3.97% and 4.42% respectively.

Claims (1)

1. a kind of electrostatic spraying method of Ultraviolet Resistant Textiles is it is characterised in that comprise the steps:

Step 1: fabric is carried out with cold-plasma surfaces treated, low-temperature plasma processing power 100～500w, process time For 10～90min, fabric moisture is adjusted to 70～100%；

Step 2: preparation has the EFI solution of anti-ultraviolet property；EFI solution is by tio₂, deionized water and ethanol composition tio₂Colloidal sol, wherein tio₂Mass percent be 0.5～1.5%；

Step 3: the injection needle just to high-voltage electrostatic spraying equipment tl-pro high-voltage electrostatic spinning machine for the fabric after step 1 is processed Head nozzle, this fabric is 10～30cm with a distance from injection needle nozzle, and the EFI solution of step 2 gained uniformly loads To on this fabric face, high-voltage electrostatic spraying solution flow rate is 0.2～2.0ml/h, and voltage is 8～30kv, and the time that receives is 15 ～90min；

Step 4: the drying textile of step 3 gained is processed 5～30min, finally obtains Ultraviolet Resistant Textiles.