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CN-121976398-A - Gradient composite gel state cooperative control method and system for protective fabric multilayer functional coating

CN121976398ACN 121976398 ACN121976398 ACN 121976398ACN-121976398-A

Abstract

The invention discloses a gel state cooperative control method and a gel state cooperative control system for gradient compounding of a multi-layer functional coating of a protective fabric, and belongs to the technical field of high-performance textile composite materials; the method aims to solve the problems of low interlayer bonding strength and easy loss of functions in the traditional multilayer coating process, and is characterized in that each layer of functional coating is precisely controlled to be in a specific gel state through on-line monitoring and closed-loop regulation and control, n layers of functional coatings are sequentially coated based on the theory, the integral curing degree S i of an i (i=1, 2, the number of the n-1) layer coating system is controlled to be in a target interval of (55+5i)% (70+5i)% to form a gradient gel state complex, then the gradient gel state complex is subjected to instant micro-distance compaction and exhaust in a gold window of 2-5 minutes, and finally the molecular chains are promoted to fully diffuse mutually at the interface through gradual hot-pressing complex and final cooperative curing of cooperative increment of temperature and line pressure, so that a high-strength fuzzy interface is formed.

Inventors

  • LIU WANLI

Assignees

  • 湖北万里防护用品有限公司

Dates

Publication Date
20260505
Application Date
20260318

Claims (10)

  1. 1. The gradient composite gel state cooperative control method for the multilayer functional coating of the protective fabric is characterized by comprising the following steps of: Sequentially coating n layers of functional coatings on a base fabric, and partially curing a current coating system after each layer of functional coating to form a multi-layer gel state coating system, wherein n is an integer of n being more than or equal to 2; Step two, after coating and partially curing the nth functional coating, carrying out instant micro-distance compaction on the formed multi-layer gel state coating system; Step three, carrying out progressive hot-pressing compounding on the multi-layer gel state coating system compacted in the step two, wherein the progressive hot-pressing compounding is carried out through at least two compounding roller pairs arranged along the travelling direction of the fabric, and the temperature and the line pressure of the latter compounding roller pair are higher than those of the former compounding roller pair; and fourthly, carrying out final cooperative curing on the multi-layer coating system compounded in the third step.
  2. 2. The method of claim 1, wherein the total number of coating layers n is defined as an integer of 2≤n≤6, and wherein the overall degree of cure S i of the i-layer coating system after application of the i-th functional coating and said partial curing satisfies the following relationship (55+5×i)%. Ltoreq.S i ltoreq.70+5×i)%, wherein i is an integer of 1 to n.
  3. 3. The method of claim 1, wherein in the third step, the temperature T m+1 of the latter pair of composite rollers is 25-40 ℃ relative to the temperature T m of the former pair of composite rollers, and the line pressure P m+1 of the latter pair of composite rollers is 1.8-2.5 times the line pressure P m of the former pair of composite rollers.
  4. 4. A method according to claim 3, wherein in step three, wen Sheng T is 25 to 35 ℃ and the multiplication factor of the line pressure is 1.8 to 2.2.
  5. 5. The method according to claim 1, wherein in the third step, the temperature T 1 of the first composite roller pair satisfies the following relationship of Max (T g,j )+10℃≤T 1 ≤Min(T c,j ) -20 ℃; Wherein j is the serial number of the coating, and j=1, 2,. -%, n; T g,j is the glass transition temperature of the j-th functional coating, T c,j is the full cure temperature of the j-th functional coating, max (T g,j ) represents the highest glass transition temperature of all n-functional coatings, and Min (T c,j ) represents the lowest full cure temperature of all n-functional coatings.
  6. 6. The method of claim 1, wherein the instant macro compaction of step two is performed within a 2-5 min time window after the completion of the partial curing of the n-th functional coating.
  7. 7. The method according to claim 1, wherein the instant macro compaction is performed by a heated steel roller and a press roller with a microporous elastic layer, the gap between the two rollers being set to 0.15-0.40 mm and the line pressure being 15-25 n/cm.
  8. 8. The method of claim 1, wherein the partial curing in step one is performed using zonal gradient heating.
  9. 9. A gradient composite coating production system for implementing the method of any one of claims 1-8, characterized in that the system sequentially comprises n coating units along the travelling direction of the fabric, wherein n is an integer of 2-6; The partial curing units are respectively arranged at the downstream of each coating unit, and the partial curing units are integrated with an on-line curing degree monitor; An instant macro compaction unit located downstream of the nth partial curing unit; a progressive hot press compounding unit comprising at least two independently adjustable and incremental compounding roller pairs of temperature and line pressure; A final co-curing unit; a central cooperative control system; The central cooperative control system is configured to receive signals from the online solidification degree monitor, and regulate and control process parameters of corresponding partial solidification units and temperature and line pressure of each roller pair of the progressive hot-pressing composite unit in real time according to a preset control model; The preset control model comprises the following steps: The curing degree control relation is (55+5×i)% -S i -70+5×i)%, wherein S i is the overall curing degree of the i-th layer coating system, i is an integer from 1 to n; The progressive hot-pressing composite control relation is that the temperature T m+1 of the rear composite roller pair and the temperature T m of the front composite roller pair are 25-40 ℃, and the line pressure P m+1 of the rear composite roller pair is 1.8-2.5 times of the line pressure P m of the front composite roller pair.
  10. 10. The system of claim 9, wherein the control model preset in the central cooperative control system further includes an initial temperature control relationship: The temperature T 1 of the first composite roller pair satisfies Max (T g,j )+10℃≤T 1 ≤Min(T c,j ) to 20C, Wherein j is the serial number of the coating, and j=1, 2,. -%, n; T g,j is the glass transition temperature of the j-th functional coating, T c,j is the full cure temperature of the j-th functional coating, max (T g,j ) represents the highest glass transition temperature of all n-functional coatings, and Min (T c,j ) represents the lowest full cure temperature of all n-functional coatings.

Description

Gradient composite gel state cooperative control method and system for protective fabric multilayer functional coating Technical Field The invention relates to the field of high-performance textile composite materials, in particular to a gel state cooperative control method and system for gradient compounding of a protective fabric multi-layer functional coating. Background The high-performance protective fabric generally adopts a composite structure of a base material and a multi-layer functional coating to integrate various performances such as flame retardance, chemical defense, wear resistance and the like, and is widely applied to the field of high-risk environmental protection such as chemical protective clothing, industrial protective textiles, army and police equipment and the like. With the increasing strictness and diversification of protection requirements, the limitation of the traditional preparation process is more and more remarkable. The existing preparation process of the multilayer functional coating mainly has two technical routes, and each has a bottleneck which is difficult to overcome: Route A, step coating-complete curing process. I.e. one layer is applied and after complete curing (degree of cure > 95%) the next layer is applied. The fundamental problem of this process is that the surface energy of the fully cured coating is significantly reduced and the molecular chain segment movement freezes, with which the subsequent coating cannot form effective intermolecular diffusion and entanglement. Interfacial bonding relies mainly on physical adsorption, resulting in low peel strength (typically 4N/cm or less) and severe performance decay after humid heat aging (retention < 70%). In addition, the process has the problems of low production efficiency, high energy consumption, easiness in heat damage of the base material due to multiple curing and the like. Route B, wet-on-wet coating process. I.e., a continuous application of multiple wet coatings, followed by one-time curing. The fundamental problem of this process is that the layers of coating penetrate one another in the liquid state, which leads to migration of functional components (e.g. flame retardants, chemical inhibitors), and the layers fail or cancel one another out. Meanwhile, a plurality of layers of solvents are concentrated and volatilized to easily generate a large number of bubbles and pinholes, and the difference of curing shrinkage rates of different coatings is easy to cause integral warping or cracking. The prior art has the following fundamental problems that quantitative description and active control on a key intermediate variable of a coating curing state are lacked, process adjustment is dependent on experience, stable and repeatable interface performance is difficult to realize, a quantitative relation model of the coating curing degree and interlayer bonding strength is not established, process parameter optimization cannot be guided from a theoretical level, a special composite process aiming at the characteristics of a multilayer system is lacked, the existing hot pressing process is mostly used for referencing single-layer material processing experience, the mutual influence and synergistic effect among the multilayer coatings are not considered, the intelligent control means are lacked in the production process, on-line monitoring and feedback adjustment cannot be realized, and the product quality stability is poor. Along with the continuous improvement of the protection standard and the expansion of the application field, the industry has higher requirements on the multilayer functional coating protection fabric that the interlayer peeling strength is required to be more than 8N/cm, the strength retention rate after the wet heat aging is more than 90 percent, and meanwhile, the production efficiency is required to be high, the cost is controllable, and the environment is friendly. Therefore, an innovative method and equipment capable of fundamentally solving the difficult problem of interface combination of the multilayer coating, establishing a quantitative process control model and realizing intelligent production are needed in the field. The technical scheme needs to realize breakthrough in multiple layers of coating physicochemical theory, mathematical modeling, process innovation, system integration and the like so as to meet the development requirements of the high-end protective fabric industry. Disclosure of Invention In order to solve the defects existing in the prior art, the invention aims to provide a gel state cooperative control method and a gel state cooperative control system for gradient compounding of a multilayer functional coating of a protective fabric, and the invention constructs an interface physical-chemical model of a gradient gel state, the intelligent cooperative control system converts the model into an accurate and continuous automatic process, so that the contradiction between