Polyester Oxford cloth flame retardant and anti-UV composite finishing
Polyester Oxford cloth flame retardant and anti-UV composite finishing
The dyed polyester Oxford fabric is treated with a composite coating using UV-531 anti-ultraviolet finishing agent, flame retardant and silver powder to give the fabric multiple functions. The effects of the dosage of different flame retardants, UV-531 finishing agent and aluminum slurry on the coating effect were compared. The primer and topcoat prescriptions were given as examples, and the relevant process parameters (control of the amount of primer, thickness of the knife) were discussed. , selection of flame retardants and solvents, etc.) were analyzed and discussed. The results show that by selecting the phosphorus-chlorine flame retardant DJ-508 and the phosphorus-nitrogen flame retardant to work together, using 25% of the UV-531 anti-ultraviolet finishing agent, and rationally selecting the silver powder coating finishing process parameters, excellent finishing effects can be obtained . Keywords: coating finishing; flame retardant; anti-radiation agent; ultraviolet radiation; Oxford cloth; polyethylene terephthalate fiber
With the improvement of people’s living standards, outdoor tourism has become a fashion, and the demand for tents and protection requirements are also increasing day by day. The dyed polyester Oxford cloth is finished with UV protection, flame retardant and silver powder composite coating, which can give the fabric multiple functions. However, in terms of process and additive selection for this type of composite coating finishing, it is necessary to take into account the compatibility of each additive without affecting the fastness and durability of the fabric. 1. Test part 1.1 Test material fabric: 66tex/66tex polyester Oxford cloth. Chemical reagents: H2O2, scouring agent, waterproofing agent, anti-UV finishing agent UV-531, flame retardant DJ-508, silver powder, polyurethane coating agent. 1.2 Instruments and equipment GZ1800-3600 high temperature and high pressure jigger dyeing machine (variable frequency), shaping machine, coating machine, XY200 electronic balance, Datacolor color measurement and matching instrument, Y813 fabric moisture meter, Y801N constant temperature oven, SW -8A type washing color fastness testing machine, HD815A type fabric flame retardant performance tester, YG6111A type sunlight color fastness tester, YG033A type drop weight fabric tearing tester. Received date: 2006-06-26 About the author: Ye Zongbao (1968-), male, from Nantong, Jiangsu, bachelor’s degree, engineer, engaged in technical production and research and development in the field of dyeing and finishing engineering. 1.3 Pre-treatment and dyeing pre-shaping of fabric dyeing process (220℃×2min) 1.4 Water-repellent finishing of fabric
Two-dipping and two-rolling water-repellent finishing agent (2% owf), pre-baking (160℃×2min), cooling and dropping cloth 1.5. Fabric coating process, entering cloth, pre-wetting primer and drying (125℃×2min), drying topcoat (165 °C Standard “Tear Properties of Textile Fabrics Part 1: Determination of Tear Strength by Impact Pendulum Method”; Sunlight fastness refers to GB/T16991-1997 Standard “Textiles Color Fastness Test High Temperature Light Color Fastness: Xenon Arc”; Ultraviolet light The protective effect refers to the AS/NZS4399-1996 standard and is characterized by ultraviolet protection factor (UPF).
2.1 Selection of flame retardants The flame retardant finishing of polyester fabrics can be done through adsorption, deposition, penetration, etc. This article adopts deposition and penetration methods to be flame retardant, which changes the combustion and decomposition mechanism of polyester and reduces the generation of flammable gases. At present, most of the flame retardants used in coatings are bromine antimony series. The flame retardant effect of this series is average, and there are powdery substances in the chemical slurry. When scraping, due to the tangential force, the material roller will easily remove the powder in the slurry. The powder is pushed to the edge, causing white powdery particles on the edge of the cloth, and the flame retardant effect is uneven on the left, middle and right sides of the cloth. The export of brominated antimony series finishing fabrics is gradually restricted, so coating manufacturers are looking for a substitute that is both uniformly flame retardant and meets environmental protection requirements. In view of this, we selected a variety of flame retardants and compared their product performance, as shown in 1. 1. Effect of flame retardants on the performance of coated fabrics. Flame retardant dosage/%. Flame retardant effect measurement. Damage length/cm afterburning time/s smoldering time/s. Sunlight fastness/Grade water repellent effect/Washing fastness/ Grade Bromine Antimony Series 2020814804 Phosphorus Nitrogen Series 2019304804DJ-508818005804
DJ-508 is a phosphorus-chlorine type flame retardant. As can be seen from 1, DJ-508 has a very good flame retardant effect without affecting the sunlight fastness and washing fastness of the coated fabric. It will affect the water repellency of the fabric and has no impact on the environmental testing of exported products. 2.2 Anti-UV finishing The effects of different dosages of anti-UV reagents on the anti-UV properties of fabrics are shown in 2. 2. Effect of UV reagent dosage on fabric performance UV-531 dosage/% UV transmittance/%UPF level 205.820252.535301.150+
It can be seen from 2 that as the amount of UV finishing agent increases, the ultraviolet transmittance decreases and the UPF level increases. However, considering the cost and the impact on color and light, the amount of finishing agent should be selected according to the customer’s requirements. 2.3 Silver powder coating finishing Silver powder coating is a type of metal coating. The silver powder slurry used for the coating is a coating glue that is compounded in an appropriate proportion of aluminum powder and PU slurry after grinding and anti-oxidation treatment. The surface of silver powder is smooth and scaly, with strong coverage. If it is not a light-shielding treatment, a certain amount of UV finishing agent needs to be added to the coating slurry to effectively prevent the penetration of infrared and ultraviolet rays. The choice of silver paste plays a key role in the quality of coated fabrics. The silver powder coating must first highlight the metallic feel of the surface, avoid exposing the bottom and dullness, and make the surface smooth and smooth. In addition, the choice of silver powder paste directly affects the reflection effect of the fabric surface, that is, the mirror effect. After repeated tests, it was found that 500 mesh silver powder particles are better than 300 or 800 mesh in terms of brightness, surface rubbing fastness and mirror effect. The amount of silver powder paste is also critical. The silver powder slurry is bonded to the fabric surface through the bridging agent in the PU slurry. If the amount is too small, the metallic feel of the fabric surface will not be strong and it will not be able to play a role.It can prevent ultraviolet rays from penetrating; if used too much, more aluminum powder will be attached to the surface, and the friction fastness will decrease, affecting the surface effect and causing stains. 500 mesh silver powder was used to test the effect of the amount of silver powder slurry on the finishing effect of the coating. The results are shown in 3. 3. The effect of the amount of aluminum powder slurry on the finishing effect of the coating. The ratio of aluminum powder slurry to polyurethane slurry/% 81216 Friction fastness/level 321 Mirror surface Poor effect, good coverage, poor coverage, good uniformity, good surface uniformity
It can be seen from 3 that the coating effect is better when the silver powder dosage is 10%. 2.4 Process prescription/part of primer and top coat polyurethane latex 100 Polyurethane latex 100 bridging agent 2 bridging agent 2 accelerator 0.5 accelerator 0.5 phosphorus nitrogen 8DJ-5088 solvent 20 aluminum slurry 12 primer temperature/℃ 115 solvent 30 vehicle speed/ (m/min) 50～60 Conditioner 5UV finishing agent 25 Top coating temperature/℃ 120 Vehicle speed/(m/min) 50～602.5 Process parameters and attention points 2.5.1 Oxford cloth coating 66tex Oxford cloth before coating , the shaping effect should be good, there should be no wrinkles, uniform surface, sufficient shaping, no shrinkage of the cloth surface and no ruffles. At the same time, due to the thick yarn count, the amount of solvent in the primer must be appropriate, otherwise it will easily cause pinholes. Adding a flame retardant to the base coat not only acts as a flame retardant, but also acts as a filler to prevent silver strands and silvery white highlights from appearing between the non-coated veil lines due to the penetration of silver powder during the top coat. Sometimes a finishing process of water-repellent first and then coating is used. 2.5.2 Control of the amount of primer The amount of primer will directly affect the surface effect and flame retardant performance of the fabric. Too little will easily cause silver bleed, and the flame retardant and anti-UV effects will be poor; too much will cause the cloth surface to be uneven, and when topcoating, it will not be applied locally. The amount of primer must also take into account the required water pressure. Water pressure is a hard indicator for customers to resist water seepage. Water pressure is generally proportional to the amount of coating. Wt0hHRI3W1
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