Flame-retardant curtain cloth and production equipment

Abstract

The invention discloses flame-retardant curtain cloth and production equipment, belongs to the technical field of textiles, and solves the problems that brominated flame retardants in flame-retardant coatings in the curtain cloth are degraded under ultraviolet rays to generate free radicals, the free radicals react with macromolecular adhesives to cause chain failure, coating microcracks occur, the flame retardants migrate to the surface, and the curtain cloth is damaged. And hydrogen bromide and formaldehyde are released through water washing stripping. Comprising a base layer and flame-retardant coatings coated on two sides of the base layer, and each flame-retardant coating comprises the following components: water-based fluorine modified acrylic resin, microencapsulated ammonium polyphosphate, melamine, pentaerythritol and a hindered amine light stabilizer. The halogen-free flame-retardant coating abandons a bromine system, a phosphorus-nitrogen system is used for eliminating harmful release, molecular chain breakage is reduced through triple ultraviolet resistance, flame retardants are fixed through microcapsule coating and a cross-linking agent and the like, the washing dissolution amount is small, aging cracks are few through fluororesin and the like, and an expanded carbon layer is formed through combustion to improve the flame retardance, reduce smoke, resist exposure to the sun and be environmentally friendly; the problem of failure of the brominated flame retardant is solved.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a flame-retardant curtain fabric and its production equipment. Background Technology

[0002] Curtains are an important element of home décor, offering practical functions such as light blocking, heat insulation, and privacy protection. They can also adjust the atmosphere of a space through their material, pattern, and style. Common materials include cotton, linen, silk, and polyester. Cotton is soft and breathable, linen has a natural texture, silk is luxurious and flowing, and polyester is durable and easy to care for. Patterns range from simple solid colors to intricate prints and jacquards, suitable for various decorating styles such as modern, Scandinavian, and Chinese, easily enhancing the aesthetics and comfort of your home.

[0003] Flame-retardant curtain fabrics, in addition to the functions of regular curtains, undergo special processing to slow down combustion, reduce open flames, and lower the risk of fire spreading when exposed to fire. They are mostly made of polyester and flame-retardant coatings, making them suitable for homes, hotels, and other places, and a practical choice for safe living.

[0004] However, the bromine-based flame retardants in the flame-retardant coating of curtain fabric decompose under ultraviolet light to produce free radicals, which react with polymer adhesives to trigger chain failure, resulting in microcracks in the coating, migration of flame retardants to the surface, peeling off after washing, and the release of hydrogen bromide and formaldehyde.

[0005] Therefore, a flame-retardant curtain fabric and its production equipment are proposed to solve or alleviate the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a flame-retardant curtain fabric and its production equipment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A flame-retardant curtain fabric includes a base layer and a flame-retardant coating applied to both sides of the base layer. The flame-retardant coating includes the following components: water-based fluorinated modified acrylic resin, microencapsulated ammonium polyphosphate, melamine, pentaerythritol, hindered amine light stabilizer, ultraviolet absorber, rutile nano-titanium dioxide, aziridine crosslinking agent, and modified organosiloxane.

[0008] Preferably, the flame-retardant coating comprises the following components by dry film weight: 35-40 parts of waterborne fluorinated modified acrylic resin, 25-30 parts of microencapsulated ammonium polyphosphate, 8-10 parts of melamine, 5-8 parts of pentaerythritol, 1.5-2.0 parts of hindered amine light stabilizer, 1.0-1.5 parts of ultraviolet absorber, 3-5 parts of rutile nano-titanium dioxide, 1.5-2.0 parts of aziridine crosslinking agent, and 0.5-1.0 parts of modified organosiloxane.

[0009] Preferably, the flame-retardant coating further comprises the following components by dry film weight: 1.0-1.5 parts fumed silica, 0.3-0.5 parts organosilicon wetting and leveling agent, and 0.2-0.3 parts polyether-modified siloxane defoamer.

[0010] Preferably, the coating layer of the microencapsulated ammonium polyphosphate is a melamine-formaldehyde copolymer with a particle size range of 2-5 μm, the hindered amine light stabilizer is HALS-622, and the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone.

[0011] This invention provides a flame-retardant curtain fabric production equipment for producing the flame-retardant curtain fabric as described above. The equipment includes a coating machine and a pre-crosslinking detection circuit mounted on the coating machine. The pre-crosslinking detection circuit scans the dielectric constant distribution and temperature gradient field on the surface of the curtain fabric within the coating machine in real time. It identifies localized pre-crosslinking regions induced by rutile titanium dioxide photocatalysis and triggers a graded response. The pre-crosslinking detection circuit includes a capacitive sensing array, a temperature sensing array, a signal conditioning module, a main control module, and an alarm output module. The SPI data output terminal of the capacitive sensing array is connected to the first SPI input channel of the signal conditioning module. The SPI data output terminal of the temperature sensing array is connected to the second SPI input channel of the signal conditioning module. The SPI main output terminal of the signal conditioning module is connected to the SPI slave input terminal of the main control module. The global clock output terminal of the signal conditioning module is connected to the global clock input terminal of the main control module. The multi-channel alarm signal output terminal of the main control module is connected to the control signal input terminal of the alarm output module.

[0012] Preferably, the capacitive sensing array includes an ECS-100-10-30B crystal oscillator, an ADF4351 phase-locked loop (PLL), a 74HC4040 frequency divider, an IRS20957 power driver, a CD74HC4067 analog switch, an LTC6268-10 transimpedance amplifier, an AD630 demodulator, an LTC1563-2 filter, an AD7177-2 analog-to-digital converter, and an electrode matrix. The electrode matrix includes 128 unit copper electrodes, each evenly spaced. The signal output of the ECS-100-10-30B crystal oscillator is connected to the reference clock input of the ADF4351 PLL. The RF output of the ADF4351 PLL is connected to the clock input of the 74HC4040 frequency divider. The twelfth division output of the 74HC4040 frequency divider is connected to the signal input of the IRS20957 power driver. The power output terminal of the device is connected to the common terminal of the CD74HC4067 analog switch. The address selection terminal of the CD74HC4067 analog switch is connected to the general-purpose input / output pin of the EP4CE10F17C8N field-programmable gate array in the main control module. The column signal output terminal of the electrode matrix is ​​connected to the inverting input terminal of the LTC6268-10 transimpedance amplifier. The output terminal of the LTC6268-10 transimpedance amplifier is connected to the signal input terminal of the AD630 demodulator. The output terminal of the AD630 demodulator is connected to the signal input terminal of the LTC1563-2 filter. The output terminal of the LTC1563-2 filter is connected to the positive analog input terminal of the AD7177-2 analog-to-digital converter. The SPI clock terminal, data input terminal, data output terminal, and chip select terminal of the AD7177-2 analog-to-digital converter are respectively connected to the corresponding port of the first channel of the ADG1412YRUZ SPI multiplexer in the signal conditioning module.

[0013] Preferably, the temperature sensing array includes several MLX90614ESF-DCI-000-TU infrared sensors, an I2C multiplexer PCA9548APW, a REF200 constant current source, a PT1000 platinum resistance temperature sensor, an INA188 instrumentation amplifier, and an ADS1248IPW analog-to-digital converter. The data lines and clock lines of several of the MLX90614ESF-DCI-000-TU infrared sensors are respectively connected to the downstream ports of the I2C multiplexer PCA9548APW. The upstream data lines and clock lines of the I2C multiplexer PCA9548APW are connected to the main interface of the STM32H743VIT6 microcontroller in the main control module. The current output of the REF200 constant current source... The signal output terminal of the INA188 instrumentation amplifier is connected to the excitation terminal of the PT1000 platinum resistance temperature sensor. The signal output terminal of the PT1000 platinum resistance temperature sensor is connected to the input channel of the ADG1412YRUZ I2C multiplexer in the signal conditioning module. The non-inverting input terminal of the INA188 instrumentation amplifier is connected to the output terminal of the ADG1412YRUZ I2C multiplexer in the signal conditioning module. The output terminal of the INA188 instrumentation amplifier is connected to the analog input channel of the ADS1248IPW analog-to-digital converter. The SPI clock terminal, data input terminal, data output terminal, and chip select terminal of the ADS1248IPW analog-to-digital converter are all connected to the corresponding ports of the second channel of the ADG1412YRUZ SPI multiplexer in the signal conditioning module.

[0014] Preferably, the signal conditioning module includes an I2C multiplexer ADG1412YRUZ and an SI5351A-B-GT clock generator. The common clock terminal of the ADG1412YRUZ is connected to the SPI clock pin of the EP4CE10F17C8N field-programmable gate array in the main control module. The common data input terminal of the ADG1412YRUZ is connected to the SPI data output pin of the EP4CE10F17C8N field-programmable gate array in the main control module. The common data output terminal of the ADG1412YRUZ is connected to the SPI data output pin of the EP4CE10F17C8N field-programmable gate array in the main control module. The input pins are connected as follows: the common chip select pin of the I2C multiplexer ADG1412YRUZ is connected to the SPI chip select pin of the EP4CE10F17C8N field-programmable gate array in the main control module; the first clock output pin of the SI5351A-B-GT clock generator is connected to the global clock input pin of the EP4CE10F17C8N field-programmable gate array in the main control module; the second clock output pin of the SI5351A-B-GT clock generator is connected to the reference clock input pin of the AD630 demodulator in the capacitive sensing array; and the data lines and clock lines of the SI5351A-B-GT clock generator are connected to the EP4CE10F17C8N field-programmable gate array in the main control module.

[0015] Preferably, the main control module includes an EP4CE10F17C8N field-programmable gate array (FPGA), an STM32H743VIT6 microcontroller, an IS61WV51216BLL memory, a LAN8720AI transceiver, an MCP2551T transceiver, and an AT24C1024B serial memory. The EP4CE10F17C8N FPGA is connected to the data bus and address bus of the IS61WV51216BLL memory. The 16-bit high-speed parallel bus of the field programmable gate array is connected to the FSMC interface of the STM32H743VIT6 microcontroller. The Ethernet transmit data line of the STM32H743VIT6 microcontroller is connected to the corresponding receiver of the LAN8720AI transceiver. The CAN transmit end of the STM32H743VIT6 microcontroller is connected to the data input end of the MCP2551T transceiver. The STM32H743VIT6 microcontroller is connected to the corresponding interface of the AT24C1024B serial memory.

[0016] Preferably, the alarm output module includes an ADuM1401 isolator, a PWM controller, an AD654JN voltage-to-frequency converter, an optocoupler, an XTR111 transmitter, a ULN2803ADWR driver chip, a relay, a buzzer, and a tri-color LED. The data input terminal of the ADuM1401 isolator is connected to the alarm signal output terminal of the EP4CE10F17C8N field-programmable gate array in the main control module. The data output terminal of the ADuM1401 isolator is connected to the data terminal and clock terminal of the PWM controller. The first output terminal of the PWM controller is connected to the signal input terminal of the AD654JN voltage-to-frequency converter. The frequency output terminal of the AD654JN voltage-to-frequency converter is connected to the anode of the optocoupler. The collector of the optocoupler is connected to the control input terminal of the XTR111 transmitter. The second output terminal of the PWM controller is connected to the input terminal of the ULN2803ADWR driver chip. The output terminal of the ULN2803ADWR driver chip is connected to the coil of the relay. The normally open contact of the relay, the buzzer, and the tri-color LED are connected in series and powered on.

[0017] The present invention has the following beneficial effects: In this invention, the halogen-free flame retardant coating abandons bromine-based coatings and uses a phosphorus-nitrogen system to eliminate harmful releases. It has triple UV protection to reduce molecular chain breakage, microcapsule encapsulation and crosslinking agents to fix flame retardants, low leaching during water washing, and fluoropolymers to reduce aging cracks. The expanded char layer formed during combustion improves flame retardancy and reduces smoke. It is also sun-resistant and environmentally friendly, solving the problem of bromine-based flame retardant failure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the flame-retardant curtain fabric in this invention; Figure 2 This is a schematic diagram of the coating machine in this invention; Figure 3 This is a structural block diagram of the pre-crosslinking detection circuit in this invention.

[0020] In the diagram: 1. Base layer; 2. Flame retardant coating; 3. Coating machine; 4. Capacitive sensor array; 5. Temperature sensor array; 6. Signal conditioning module; 7. Main control module; 8. Alarm output module. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] A flame-retardant curtain fabric and its production equipment include a base layer 1 and a flame-retardant coating 2 coated on both sides of the base layer 1. The flame-retardant coating 2 includes the following components: water-based fluorinated modified acrylic resin, microencapsulated ammonium polyphosphate, melamine, pentaerythritol, hindered amine light stabilizer, ultraviolet absorber, rutile nano titanium dioxide, aziridine crosslinking agent, modified organosiloxane, fumed silica, organosilicone wetting and leveling agent, and polyether modified siloxane defoamer.

[0028] Specifically, the flame-retardant coating 2 comprises the following components by dry film weight: 35-40 parts waterborne fluorinated modified acrylic resin, 25-30 parts microencapsulated ammonium polyphosphate, 8-10 parts melamine, 5-8 parts pentaerythritol, 1.5-2.0 parts hindered amine light stabilizer, 1.0-1.5 parts ultraviolet absorber, 3-5 parts rutile nano titanium dioxide, 1.5-2.0 parts aziridine crosslinking agent, 0.5-1.0 parts modified organosiloxane, 1.0-1.5 parts fumed silica, 0.3-0.5 parts organosilicon wetting and leveling agent, and 0.2-0.3 parts polyether modified siloxane defoamer. The microencapsulated ammonium polyphosphate coating layer is a melamine-formaldehyde copolymer with a particle size range of 2-5 μm. The hindered amine light stabilizer is HALS-622, and the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone.

[0029] The flame-retardant coating 2 in this invention eliminates the release of hydrogen bromide and formaldehyde from the source by abandoning bromine-based flame retardants and adopting a phosphorus-nitrogen synergistic expansion system, namely 25-30 parts microencapsulated ammonium polyphosphate, 8-10 parts melamine, and 5-8 parts pentaerythritol.

[0030] Simultaneously, the anti-UV mechanism blocks free radical chain reactions, the hindered amine light stabilizer continuously captures free radicals and regenerates them through the DENISON cycle, the UV absorber converts 290-400nm UV light into heat energy, and rutile nano titanium dioxide physically shields more than 85% of UV light, reducing the molecular chain breakage rate by 90% and eliminating the generation of microcracks.

[0031] To address the issues of flame retardant migration and water washing peeling, the melamine-formaldehyde copolymer coating layer of microencapsulated ammonium polyphosphate blocks water molecule penetration. Combined with aziridine crosslinking agent and fluorinated modified acrylic resin, a three-dimensional network is formed, anchoring the flame retardant in the crosslinked structure. After water washing, the amount of flame retardant leached is low.

[0032] The high bond energy and surface orientation of the CF bonds in fluoropolymers, combined with the stress-dispersing effect of modified organosiloxanes, result in a low crack density in the coating even after prolonged QUV aging. Simultaneously, during combustion, APP / MEL / PER form a multi-layered expanded char layer, achieving a LOI ≥ 32% and reducing smoke density.

[0033] The regeneration and recycling mechanism of hindered amine light stabilizers, the ultraviolet scattering of fluoropolymers, and the synergistic effect of inert nano-titanium dioxide achieve low flame retardancy degradation after 2 years of outdoor exposure. The halogen-free design and complete cross-linking meet REACH environmental standards.

[0034] This invention provides a flame-retardant curtain fabric production equipment for producing the flame-retardant curtain fabric described above. Figure 2 and Figure 3 As shown, the system includes a coating machine 3 and a pre-crosslinking detection circuit mounted on the coating machine 3. The coating pre-crosslinking detection circuit scans the dielectric constant distribution and temperature gradient field on the surface of the curtain fabric inside the coating machine 3 in real time, identifies the local pre-crosslinking area caused by rutile titanium dioxide photocatalysis, and triggers a graded response. The pre-crosslinking detection circuit includes a capacitive sensing array 4, a temperature sensing array 5, a signal conditioning module 6, a main control module 7, and an alarm output module 8. The SPI data output terminal of the capacitive sensing array 4 is connected to the first SPI input channel of the signal conditioning module 6, the SPI data output terminal of the temperature sensing array 5 is connected to the second SPI input channel of the signal conditioning module 6, the SPI main output terminal of the signal conditioning module 6 is connected to the SPI slave input terminal of the main control module 7, the global clock output terminal of the signal conditioning module 6 is connected to the global clock input terminal of the main control module 7, and the multi-channel alarm signal output terminal of the main control module 7 is connected to the control signal input terminal of the alarm output module 8.

[0035] However, during the process of coating the flame retardant coating 2 onto the base layer 1 by the coating machine 3, the curtain fabric in the coating machine 3 trough is exposed to ambient ultraviolet light. After the hindered amine light stabilizer is exhausted, the rutile titanium dioxide triggers a free radical reaction. Furthermore, since the pre-crosslinking only occurs on the surface of the trough, the viscosity of the lower slurry is normal, making identification difficult. Therefore, the pre-crosslinking detection circuit is used for monitoring.

[0036] The capacitive sensing array 4 includes an ECS-100-10-30B crystal oscillator, an ADF4351 phase-locked loop (PLL), a 74HC4040 frequency divider, an IRS20957 power driver, a CD74HC4067 analog switch, an LTC6268-10 transimpedance amplifier, an AD630 demodulator, an LTC1563-2 filter, an AD7177-2 analog-to-digital converter, and an electrode matrix. The electrode matrix comprises 128 uniformly spaced copper electrodes. The signal output of the ECS-100-10-30B crystal oscillator is connected to the reference clock input of the ADF4351 PLL. The RF output of the ADF4351 PLL is connected to the clock input of the 74HC4040 frequency divider. The twelfth division output of the 74HC4040 frequency divider is connected to the signal input of the IRS20957 power driver. The power input of the IRS20957 power driver... The output terminal is connected to the common terminal of the CD74HC4067 analog switch. The address selection terminal of the CD74HC4067 analog switch is connected to the general-purpose input / output pin of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The column signal output terminal of the electrode matrix is ​​connected to the inverting input terminal of the LTC6268-10 transimpedance amplifier. The output terminal of the LTC6268-10 transimpedance amplifier is connected to the signal input terminal of the AD630 demodulator. The output terminal of the AD630 demodulator is connected to the signal input terminal of the LTC1563-2 filter. The output terminal of the LTC1563-2 filter is connected to the positive analog input terminal of the AD7177-2 analog-to-digital converter. The SPI clock terminal, data input terminal, data output terminal, and chip select terminal of the AD7177-2 analog-to-digital converter are respectively connected to the corresponding ports of the first channel of the ADG1412YRUZ SPI multiplexer in the signal conditioning module 6.

[0037] The temperature sensing array 5 includes several MLX90614ESF-DCI-000-TU infrared sensors, an I2C multiplexer PCA9548APW, a REF200 constant current source, a PT1000 platinum resistance temperature sensor, an INA188 instrumentation amplifier, and an ADS1248IPW analog-to-digital converter. The data and clock lines of the MLX90614ESF-DCI-000-TU infrared sensors are connected to the downstream ports of the I2C multiplexer PCA9548APW. The upstream data and clock lines of the I2C multiplexer PCA9548APW are connected to the main interface of the STM32H743VIT6 microcontroller in the main control module 7. The current output terminal of the REF200 constant current source is connected to... The excitation terminal of the PT1000 platinum resistance temperature sensor is connected to the input channel of the ADG1412YRUZ I2C multiplexer in signal conditioning module 6. The non-inverting input terminal of the INA188 instrumentation amplifier is connected to the output terminal of the ADG1412YRUZ I2C multiplexer in signal conditioning module 6. The output terminal of the INA188 instrumentation amplifier is connected to the analog input channel of the ADS1248IPW analog-to-digital converter. The SPI clock terminal, data input terminal, data output terminal, and chip select terminal of the ADS1248IPW analog-to-digital converter are all connected to the corresponding ports of the second channel of the ADG1412YRUZ SPI multiplexer in signal conditioning module 6.

[0038] Signal conditioning module 6 includes an I2C multiplexer ADG1412YRUZ and an SI5351A-B-GT clock generator. The common clock terminal of the ADG1412YRUZ is connected to the SPI clock pin of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The common data input terminal of the ADG1412YRUZ is connected to the SPI data output pin of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The common data output terminal of the ADG1412YRUZ is connected to the SPI data input pin of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The common chip select pin of the ADG1412YRUZ I2C multiplexer is connected to the SPI chip select pin of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The first clock output pin of the SI5351A-B-GT clock generator is connected to the global clock input pin of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The second clock output pin of the SI5351A-B-GT clock generator is connected to the reference clock input pin of the AD630 demodulator in the capacitance sensor array 4. The data lines and clock lines of the SI5351A-B-GT clock generator are connected to the EP4CE10F17C8N field-programmable gate array in the main control module 7.

[0039] The main control module 7 includes an EP4CE10F17C8N field-programmable gate array (FPGA), an STM32H743VIT6 microcontroller, an IS61WV51216BLL memory, a LAN8720AI transceiver, an MCP2551T transceiver, and an AT24C1024B serial memory. The EP4CE10F17C8N FPGA is connected to the IS61WV51216BLL memory via data and address buses. The 16-bit high-speed parallel bus of the programmable gate array is connected to the FSMC interface of the STM32H743VIT6 microcontroller. The Ethernet transmit data line of the STM32H743VIT6 microcontroller is connected to the corresponding receiver of the LAN8720AI transceiver. The CAN transmit end of the STM32H743VIT6 microcontroller is connected to the data input end of the MCP2551T transceiver. The STM32H743VIT6 microcontroller is connected to the corresponding interface of the AT24C1024B serial memory.

[0040] The alarm output module 8 includes an ADuM1401 isolator, a PWM controller, an AD654JN voltage-to-frequency converter, an optocoupler, an XTR111 transmitter, a ULN2803ADWR driver chip, a relay, a buzzer, and a tri-color LED. The data input terminal of the ADuM1401 isolator is connected to the alarm signal output terminal of the EP4CE10F17C8N field-programmable gate array in the main control module 7. The data output terminal of the ADuM1401 isolator is connected to the data terminal and clock terminal of the PWM controller. The first output terminal of the PWM controller is connected to the signal input terminal of the AD654JN voltage-to-frequency converter. The frequency output terminal of the AD654JN voltage-to-frequency converter is connected to the anode of the optocoupler. The collector of the optocoupler is connected to the control input terminal of the XTR111 transmitter. The second output terminal of the PWM controller is connected to the input terminal of the ULN2803ADWR driver chip. The output terminal of the ULN2803ADWR driver chip is connected to the coil of the relay. The normally open contact of the relay, the buzzer, and the tri-color LED are connected in series and then powered on.

[0041] When the pre-crosslinking detection circuit is working, the SI5351A-B-GT clock generator in the signal conditioning module 6 receives the configuration command of the EP4CE10F17C8N field-programmable gate array through the bus, generates a 40MHz global clock signal from its first clock output terminal and inputs it to the global clock input pin of the EP4CE10F17C8N field-programmable gate array, synchronously triggering the acquisition cycle of the capacitance sensing array 4 and the temperature sensing array 5. At the same time, it outputs a 1MHz square wave from its second clock output terminal to the reference clock input terminal of the AD630 demodulator to establish a time base for subsequent synchronous demodulation.

[0042] The 10MHz reference signal generated by the ECS-100-10-30B-TR crystal oscillator in the capacitive sensing array 4 is input to the reference clock input of the ADF4351 phase-locked loop. After internal frequency multiplication, a 2.4GHz signal is output from the RF output to the clock input of the 74HC4040 frequency divider. The output of the twelfth divider generates a 100kHz excitation signal, which is amplified by the IRS20957 power driver and then input to the common terminal of the CD74HC4067 analog switch. The EP4CE10F17C8N field-programmable gate array controls the address selection of the analog switch through general-purpose input / output pins. At the end, a 128-electrode matrix is ​​scanned at a speed of 500 μs / line. When the coating undergoes pre-crosslinking, the increased polarity of the crosslinked molecular chains leads to an increase in the local dielectric constant. The change in capacitance between the electrodes is converted into a voltage signal by an LTC6268-10 transimpedance amplifier. The phase information carried by this signal is coherently detected by an AD630 demodulator based on a reference clock. After separating the real and imaginary components, the signal is filtered by an LTC1563-2 filter to eliminate high-frequency noise. Finally, it is digitized by an AD7177-2 analog-to-digital converter with a resolution of 24 bits. This process has a sensitivity of 0.01 fF for a 0.1 mm³ pre-crosslinked region.

[0043] Meanwhile, temperature sensor array 5 initiates dual-mode acquisition. Thirty-two MLX90614ESF-DCI-000-TU infrared sensors upload surface 0.3mm deep infrared radiation data to the STM32H743VIT6 microcontroller via I2C multiplexer PCA9548APW. Thirty-two PT1000 platinum resistance temperature sensors, under the excitation of a 100μA constant current source from REF200, input their resistance changes to the INA188ID instrumentation amplifier after being selected by I2C multiplexer ADG1412YRUZ. The amplified signal is then acquired by the ADS1248IPW analog-to-digital converter. When pre-crosslinking occurs, the exothermic crosslinking causes the local temperature gradient to exceed the threshold, and this anomaly is captured.

[0044] All sensor data are aggregated to the main control module 7 via an I2C multiplexer ADG1412YRUZ. The EP4CE10F17C8N field-programmable gate array executes a dual-modal fusion algorithm in real time via a hardware accelerator. First, the capacitance data is fitted with a Cole-Cole model to extract the characteristic frequency offset. Simultaneously, the temperature difference matrix between the infrared and platinum resistance thermometers is calculated. When the capacitance change rate is greater than a threshold and the temperature gradient is greater than a threshold, cross-correlation calculation is triggered.

[0045] After confirmation that the EP4CE10F17C8N field programmable gate array is pre-crosslinked, it sends a command from the alarm signal output terminal. After electrical isolation by the ADuM1401 digital isolator, the PWM controller is driven by: the first PWM output is isolated by the AD654JN voltage-to-frequency converter and the 6N137S optocoupler, and controls the XTR111 current transmitter to generate a 4-20mA signal to the PLC of the coating machine 3 to realize linear early warning; the second PWM output drives the ULN2803ADWR driver chip to activate the relay to drive the buzzer and the tri-color LED to work.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flame-retardant curtain fabric, characterized in that, It includes a base layer (1) and a flame-retardant coating (2) applied to both sides of the base layer (1). The flame-retardant coating (2) includes the following components: waterborne fluorinated modified acrylic resin, microencapsulated ammonium polyphosphate, melamine, pentaerythritol, hindered amine light stabilizer, ultraviolet absorber, rutile nano-titanium dioxide, aziridine crosslinking agent, and modified organosiloxane.

2. The flame-retardant curtain fabric according to claim 1, characterized in that, The flame-retardant coating (2) comprises the following components by dry film mass: 35-40 parts waterborne fluorinated modified acrylic resin, 25-30 parts microencapsulated ammonium polyphosphate, 8-10 parts melamine, 5-8 parts pentaerythritol, 1.5-2.0 parts hindered amine light stabilizer, 1.0-1.5 parts ultraviolet absorber, 3-5 parts rutile nano titanium dioxide, 1.5-2.0 parts aziridine crosslinking agent, and 0.5-1.0 parts modified organosiloxane.

3. The flame-retardant curtain fabric according to claim 1, characterized in that, The flame-retardant coating (2) further comprises the following components by dry film mass: 1.0-1.5 parts fumed silica, 0.3-0.5 parts organosilicon wetting and leveling agent, and 0.2-0.3 parts polyether modified siloxane defoamer.

4. The flame-retardant curtain fabric according to claim 1, characterized in that, The coating layer of the microencapsulated ammonium polyphosphate is a melamine-formaldehyde copolymer with a particle size range of 2-5 μm. The hindered amine light stabilizer is HALS-622, and the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone.

5. A flame-retardant curtain fabric production equipment, used to produce flame-retardant curtain fabric as described in any one of claims 1-4, characterized in that, The system includes a coating machine (3) and a pre-crosslinking detection circuit installed on the coating machine (3). The coating pre-crosslinking detection circuit scans the dielectric constant distribution and temperature gradient field of the curtain fabric surface inside the coating machine (3) in real time, identifies the local pre-crosslinking area caused by rutile titanium dioxide photocatalysis, and triggers a graded response. The pre-crosslinking detection circuit includes a capacitance sensing array (4), a temperature sensing array (5), a signal conditioning module (6), a main control module (7), and an alarm output module (8). The SPI data output terminal of the capacitance sensing array (4) is connected to the first SPI input channel of the signal conditioning module (6). The SPI data output terminal of the temperature sensing array (5) is connected to the second SPI input channel of the signal conditioning module (6). The SPI main output terminal of the signal conditioning module (6) is connected to the SPI slave input terminal of the main control module (7). The global clock output terminal of the signal conditioning module (6) is connected to the global clock input terminal of the main control module (7). The multi-channel alarm signal output terminal of the main control module (7) is connected to the control signal input terminal of the alarm output module (8).

6. The flame-retardant curtain fabric production equipment according to claim 5, characterized in that, The capacitance sensing array (4) includes an ECS-100-10-30B crystal oscillator, an ADF4351 phase-locked loop (PLL), a 74HC4040 frequency divider, an IRS20957 power driver, a CD74HC4067 analog switch, an LTC6268-10 transimpedance amplifier, an AD630 demodulator, an LTC1563-2 filter, an AD7177-2 analog-to-digital converter, and an electrode matrix. The electrode matrix includes 128 unit copper electrodes, evenly spaced. The signal output of the ECS-100-10-30B crystal oscillator is connected to the reference clock input of the ADF4351 PLL. The RF output of the ADF4351 PLL is connected to the clock input of the 74HC4040 frequency divider. The twelfth division output of the 74HC4040 frequency divider is connected to the signal input of the IRS20957 power driver. The power input of the IRS20957 power driver... The output terminal is connected to the common terminal of the CD74HC4067 analog switch. The address selection terminal of the CD74HC4067 analog switch is connected to the general-purpose input / output pin of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The column signal output terminal of the electrode matrix is ​​connected to the inverting input terminal of the LTC6268-10 transimpedance amplifier. The output terminal of the LTC6268-10 transimpedance amplifier is connected to the signal input terminal of the AD630 demodulator. The output terminal of the AD630 demodulator is connected to the signal input terminal of the LTC1563-2 filter. The output terminal of the LTC1563-2 filter is connected to the positive analog input terminal of the AD7177-2 analog-to-digital converter. The SPI clock terminal, data input terminal, data output terminal and chip select terminal of the AD7177-2 analog-to-digital converter are respectively connected to the corresponding port of the first channel of the ADG1412YRUZ SPI multiplexer in the signal conditioning module (6).

7. The flame-retardant curtain fabric production equipment according to claim 5, characterized in that, The temperature sensing array (5) includes several MLX90614ESF-DCI-000-TU infrared sensors, an I2C multiplexer PCA9548APW, a REF200 constant current source, a PT1000 platinum resistance temperature sensor, an INA188 instrumentation amplifier, and an ADS1248IPW analog-to-digital converter. The data lines and clock lines of several of the MLX90614ESF-DCI-000-TU infrared sensors are respectively connected to the downstream port of the I2C multiplexer PCA9548APW. The upstream data lines and clock lines of the I2C multiplexer PCA9548APW are connected to the main interface of the STM32H743VIT6 microcontroller in the main control module (7). The current output terminal of the REF200 constant current source is connected to... The excitation terminal of the PT1000 platinum resistance temperature sensor is connected to the input channel of the I2C multiplexer ADG1412YRUZ in the signal conditioning module (6). The non-inverting input terminal of the INA188 instrumentation amplifier is connected to the output terminal of the I2C multiplexer ADG1412YRUZ in the signal conditioning module (6). The output terminal of the INA188 instrumentation amplifier is connected to the analog input channel of the ADS1248IPW analog-to-digital converter. The SPI clock terminal, data input terminal, data output terminal and chip select terminal of the ADS1248IPW analog-to-digital converter are respectively connected to the corresponding ports of the second channel of the SPI multiplexer ADG1412YRUZ in the signal conditioning module (6).

8. The flame-retardant curtain fabric production equipment according to claim 5, characterized in that, The signal conditioning module (6) includes an I2C multiplexer ADG1412YRUZ and an SI5351A-B-GT clock generator. The common clock terminal of the I2C multiplexer ADG1412YRUZ is connected to the SPI clock pin of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The common data input terminal of the I2C multiplexer ADG1412YRUZ is connected to the SPI data output pin of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The common data output terminal of the I2C multiplexer ADG1412YRUZ is connected to the SPI data input pin of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The common chip select pin of the I2C multiplexer ADG1412YRUZ is connected to the SPI chip select pin of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The first clock output pin of the SI5351A-B-GT clock generator is connected to the global clock input pin of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The second clock output pin of the SI5351A-B-GT clock generator is connected to the reference clock input pin of the AD630 demodulator in the capacitive sensing array (4). The data line and clock line of the SI5351A-B-GT clock generator are connected to the EP4CE10F17C8N field-programmable gate array in the main control module (7).

9. The flame-retardant curtain fabric production equipment according to claim 5, characterized in that, The main control module (7) includes an EP4CE10F17C8N field-programmable gate array (FPGA), an STM32H743VIT6 microcontroller, an IS61WV51216BLL memory, a LAN8720AI transceiver, an MCP2551T transceiver, and an AT24C1024B serial memory. The EP4CE10F17C8N FPGA is connected to the data bus and address bus of the IS61WV51216BLL memory. The 16-bit high-speed parallel bus of the field programmable gate array is connected to the FSMC interface of the STM32H743VIT6 microcontroller. The Ethernet transmit data line of the STM32H743VIT6 microcontroller is connected to the corresponding receiver of the LAN8720AI transceiver. The CAN transmit end of the STM32H743VIT6 microcontroller is connected to the data input end of the MCP2551T transceiver. The STM32H743VIT6 microcontroller is connected to the corresponding interface of the AT24C1024B serial memory.

10. A flame-retardant curtain fabric production equipment according to claim 5, characterized in that, The alarm output module (8) includes an ADuM1401 isolator, a PWM controller, an AD654JN voltage-to-frequency converter, an optocoupler, an XTR111 transmitter, a ULN2803ADWR driver chip, a relay, a buzzer, and a tri-color LED. The data input terminal of the ADuM1401 isolator is connected to the alarm signal output terminal of the EP4CE10F17C8N field-programmable gate array in the main control module (7). The data output terminal of the ADuM1401 isolator is connected to the data terminal and clock terminal of the PWM controller. The first output terminal of the PWM controller is connected to the signal input terminal of the AD654JN voltage-to-frequency converter. The frequency output terminal of the AD654JN voltage-to-frequency converter is connected to the anode of the optocoupler. The collector of the optocoupler is connected to the control input terminal of the XTR111 transmitter. The second output terminal of the PWM controller is connected to the input terminal of the ULN2803ADWR driver chip. The output terminal of the ULN2803ADWR driver chip is connected to the coil of the relay. The normally open contact of the relay, the buzzer, and the tri-color LED are connected in series and then powered on.

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