A melt-spun phase change fiber temperature control master batch and a preparation method thereof
By combining modified polyurethane-grafted silica composite shell material with bio-based phase change material, the problems of temperature resistance and environmental protection in melt-spun phase change fiber are solved, achieving the stability of phase change material and uniformity of fiber quality at high temperatures, which is suitable for high-speed core-sheath spinning process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU SHANGXUAN TECH CO LTD
- Filing Date
- 2026-04-07
- Publication Date
- 2026-06-09
AI Technical Summary
Existing melt-spun phase change fibers have insufficient temperature resistance and mechanical strength, poor environmental performance, and the phase change microcapsules are prone to rupture and volatilization at high temperatures, resulting in a decrease in enthalpy and equipment pollution, and the fiber quality is unstable.
A combination of high-density polyethylene matrix, high-temperature resistant phase change microcapsules, porous soft polymer and melt index improver was used to prepare high-temperature resistant and environmentally friendly phase change microcapsules by modifying polyurethane-grafted silica composite shell material and bio-based phase change material. The microcapsules were then formed into uniformly dispersed masterbatches through melt extrusion granulation and post-processing.
It improves the temperature resistance and environmental friendliness of the masterbatch, ensures that the phase change material does not volatilize at high temperatures, enhances the uniformity and stability of the fiber, is suitable for high-speed core-sheath spinning process, and reduces the breakage rate.
Smart Images
Figure CN122167860A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of functional fiber materials technology, specifically to a temperature-controlled masterbatch for melt-spun phase change fibers and its preparation method. Background Technology
[0002] Melt spinning is one of the mainstream processes for preparing phase change temperature-controlled fibers. Currently, phase change microcapsules are often melt-blended with fiber-grade chips (such as polyamide and polyester) and extruded to granulate, producing phase change temperature-controlled masterbatches, which are then used in subsequent core-sheath spinning. However, existing technologies have the following significant shortcomings: 1. Insufficient temperature resistance and mechanical strength: The shell material of traditional phase change microcapsules (such as melamine-formaldehyde resin and ordinary polymers) has poor heat resistance. During the granulation of masterbatch and high-temperature spinning process (usually above 250°C), the shell material is prone to softening and cracking, which leads to leakage and volatilization of the phase change core material. This not only causes a large loss of phase change material and a decrease in enthalpy, but also contaminates equipment and affects the continuity of spinning.
[0003] 2. Environmental and safety issues: In existing technologies, the core material of phase change microcapsules is mostly petroleum-based alkanes (such as paraffin), which have poor biodegradability and do not conform to the trend of green environmental protection. In addition, alkanes have low flash points (usually below 200°C), posing safety hazards during high-temperature processing (they are prone to spontaneous combustion), and their resistance to high-temperature oxidation is also poor.
[0004] 3. Unstable uniformity of masterbatch and fiber quality: Due to the poor compatibility and large density difference between phase change microcapsules and polymer matrices (such as polyamides) (the density of polyester and polyamides is greater than 1.1, while that of microcapsules is less than 0.9), they are difficult to disperse uniformly during melt blending and are prone to agglomeration or sedimentation. This results in large fluctuations in the enthalpy value of the prepared masterbatch and poor yarn uniformity. At the same time, it is easy to clog the pores and break the yarn during spinning, which in turn makes the temperature regulation performance of the final fiber product unstable, the mechanical strength insufficient, and the yield low.
[0005] Therefore, the present invention provides a temperature-controlled masterbatch for melt-spun phase change fiber and its preparation method. Summary of the Invention
[0006] The purpose of this invention is to provide a temperature-controlled masterbatch for melt-spun phase change fibers and its preparation method.
[0007] To solve the above-mentioned technical problems, the objective of this invention is achieved as follows: A temperature-controlled masterbatch for melt-spun phase change fibers comprises the following components in parts by weight: High-density polyethylene matrix, 40-60 parts; High-temperature resistant phase change microcapsules, 30-50 parts; Three-dimensional porous soft polymer, 5-10 parts; Melt index improver, 1-5 parts.
[0008] Based on the above scheme and as a preferred embodiment of the above scheme, the high-temperature resistant phase change microcapsule includes a core material and a shell material. The core material is a ternary eutectic bio-based phase change material, and the shell material is a modified polyurethane-grafted silica composite shell material. The ternary eutectic bio-based phase change material is composed of decanoic acid, lauric acid, and palmitic acid.
[0009] Based on the above scheme and as a preferred embodiment of the above scheme, the phase transition temperature range of the high-temperature resistant phase change microcapsules is 26-30℃.
[0010] Based on the above scheme and as a preferred embodiment of the above scheme, the three-dimensional porous soft polymer is a porous oil-absorbing resin.
[0011] Based on the above scheme and as a preferred embodiment of the above scheme, the melt index improver is maleic anhydride-grafted polyethylene.
[0012] A method for preparing a temperature-controlled masterbatch for melt-spun phase change fibers, characterized by comprising the following steps: S1. Preparation of high-temperature resistant phase change microcapsules; S2, Raw material mixing; S3, melt extrusion granulation; S4, Post-processing; Step S1 includes core material preparation and shell material preparation; The preparation of the core material includes: mixing decanoic acid, lauric acid and palmitic acid in a ratio of 8:1:1, melting at 60-80°C, and stirring at 300-500 rpm for 1 hour to obtain a phase change core material; The shell material preparation includes: functionalization of nano-silica, synthesis of silica-grafted modified polyurethane prepolymer, and encapsulation molding of phase change microcapsules. The functionalization of the nano-silica includes: mixing and reacting nano-silica with polytetrahydrofuran ether diol at 100-120°C for 0.5-1 hour, so that polytetrahydrofuran ether diol is grafted onto the surface of silica, and silica-grafted polytetrahydrofuran diol is prepared. The synthesis of the silica-grafted modified polyurethane prepolymer includes: reacting silica-grafted polytetrahydrofuran diol with isocyanate at 70-85°C under nitrogen protection for 1-3 hours to prepare the silica-modified polyurethane prepolymer. The encapsulation and molding of the phase change microcapsules includes: preparation of a prepolymer dispersion containing phase change material, interfacial polymerization chain extension, and post-treatment; the preparation of the prepolymer dispersion containing phase change material includes: cooling a silica-modified polyurethane prepolymer to below 50°C, adding alkali to neutralize the hydrophilic groups in the silica-modified polyurethane prepolymer, with a neutralization degree of 50%-100%, adding the phase change core material to the neutralized prepolymer under high-speed shear, and slowly adding deionized water under high-speed stirring to obtain a polyurethane prepolymer dispersion containing phase change material; The interfacial polymerization chain extension includes: slowly adding an aqueous organic amine solution to a polyurethane prepolymer dispersion containing a phase change material under stirring, and reacting to form a polyurethane wall material.
[0013] Based on the above scheme and as a preferred embodiment of the above scheme, the post-processing includes: demulsification, filtration, washing and drying.
[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. High temperature resistance and low loss: The microcapsule shell material has a temperature resistance of up to 300℃ and the core material has a high flash point (220℃), ensuring that the phase change material of the masterbatch has almost no volatilization and no leakage under the processing conditions of 250-280℃, and the loss rate is far better than that of traditional masterbatch.
[0015] 2. Environmental protection and safety: The core phase change material is a mixture of bio-based fatty acids and fatty alcohols, which is green and biodegradable and meets the requirements of sustainable development.
[0016] 3. Stable performance and high fiber quality: Through a unique masterbatch formulation design, highly uniform and stable dispersion of phase change microcapsules in the matrix is achieved. This results in fibers produced from the masterbatch that are more stable and reliable.
[0017] 4. Excellent processing performance: The masterbatch melt has good fluidity and good compatibility with nylon chips, making it suitable for high-speed core-sheath spinning processes. The spinning process is continuous and stable with a low breakage rate. Attached Figure Description
[0018] Figure 1 This is a flowchart of the masterbatch preparation process for the present invention. Detailed Implementation
[0019] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.
[0020] A temperature-controlled masterbatch for melt-spun phase change fibers comprises the following components in parts by weight: 40-60 parts high-density polyethylene matrix, 30-50 parts high-temperature resistant phase change microcapsules, 5-10 parts three-dimensional porous soft polymer and 1-5 parts melt index improver.
[0021] The high-temperature resistant phase change microcapsules consist of a core material and a shell material. The core material is a ternary eutectic bio-based phase change material, and the shell material is a modified polyurethane-grafted silica composite shell material. The ternary eutectic bio-based phase change material is composed of decanoic acid, lauric acid, and palmitic acid in a ratio of 8:1:1. The phase change temperature range of the high-temperature resistant phase change microcapsules is 26-30℃, the phase change enthalpy is ≥220J / g, and the flash point is greater than 220℃, exhibiting excellent heat resistance and environmental friendliness. The three-dimensional porous soft polymer is a porous, oil-absorbing resin with uniform pore size and elasticity. During melt blending, it can simultaneously adsorb phase change microcapsules and high-density polyethylene matrix, acting as a "molecular bridge" to make the two bonds stronger and the mixture more uniform.
[0022] The melt index improver is maleic anhydride-grafted polyethylene. It effectively reduces the melt viscosity of the blend system, improves flowability, and enables a more uniform distribution of phase change microcapsules with large density and volume differences with the high-density polyethylene matrix in a twin-screw extruder, avoiding stratification or agglomeration caused by flow differences.
[0023] The preparation method of the above-mentioned melt-spun phase change fiber temperature-controlled masterbatch includes the following steps: S1. Preparation of high-temperature resistant phase change microcapsules; S2, Raw material mixing; S3, melt extrusion granulation; S4, Post-processing.
[0024] Step S1 includes core material preparation and shell material preparation; The preparation of the core material includes: mixing decanoic acid, lauric acid and palmitic acid in a ratio of 8:1:1, melting them at 60-80℃, and stirring them at 300-500 rpm for 1 hour to obtain the phase change core material; Shell material preparation includes: functionalization of nano-silica, synthesis of silica-grafted modified polyurethane prepolymer and encapsulation molding of phase change microcapsules; The functionalization of nano-silica includes: mixing and reacting nano-silica with polytetrahydrofuran ether diol at 100-120℃ for 0.5-1 hour, so that polytetrahydrofuran ether diol is grafted onto the surface of silica to prepare silica-grafted polytetrahydrofuran diol.
[0025] The synthesis of silica-grafted modified polyurethane prepolymer includes: reacting silica-grafted polytetrahydrofuran diol with isocyanate at 70-85℃ under nitrogen protection for 1-3 hours to prepare silica-modified polyurethane prepolymer. The encapsulation and molding of phase change microcapsules includes: preparation of a prepolymer dispersion containing phase change material, interfacial polymerization chain extension and post-treatment; the preparation of the prepolymer dispersion containing phase change material includes: cooling a silica-modified polyurethane prepolymer to below 50°C, adding alkali to neutralize the hydrophilic groups in the silica-modified polyurethane prepolymer to generate salt, giving it self-emulsifying ability, with a neutralization degree of 50%-100%, then adding the phase change core material to the neutralized prepolymer under high-speed shear, and then slowly adding deionized water under high-speed stirring to obtain a polyurethane prepolymer dispersion containing phase change material; The interfacial polymerization chain extension process includes: slowly adding an aqueous organic amine solution to a polyurethane prepolymer dispersion containing a phase change material under stirring, reacting to form a polyurethane wall material. The amine groups react rapidly with the -NCO groups at the ends of the prepolymer at the oil-water interface of the phase change material droplets, completing chain extension and cross-linking to form a dense polyurethane wall material that encapsulates the phase change material. Silica is firmly embedded in the polyurethane wall material through chemical bonding.
[0026] After the reaction was completed, phase change microcapsules were prepared by demulsification, filtration, washing and drying.
[0027] The principle behind improved flash point and high-temperature resistance: I. Phase change substrate: Low-temperature eutectic mixtures reduce the overall saturated vapor pressure of the mixture by forming strong intermolecular interactions, thereby inhibiting the generation of flammable vapors at lower temperatures, requiring heating to higher temperatures to reach the flash point.
[0028] 2. Microcapsule wall material: 1. Chemical bond strengthening: Formation of high-energy, stable hybrid cross-linked networks: Intrinsic weaknesses of polyurethane: The thermal stability of pure PU is limited by the chemical bonds in its molecular backbone. Carbamate bonds may dissociate at high temperatures (150-250℃), generating isocyanates and alcohols. Soft segments are also prone to oxidative degradation at high temperatures.
[0029] Introduction of silica: When silica is introduced into PU by chemical bonding, it will form a strong covalent bond (Si-OC or Si-O-Si-C bond) at the interface between the organic phase of PU and the inorganic phase of silica.
[0030] Increased bond energy: The Si-O bond energy is very high (approximately 460 kJ / mol), far exceeding that of the C-C bond (approximately 348 kJ / mol) and the CO bond (approximately 360 kJ / mol). These high-energy Si-O bonds act like "steel bars" anchored within the "rubber" network of PU, significantly enhancing the entire network's resistance to thermal damage. Breaking these bonds requires even higher energy, thus directly raising the material's initial thermal decomposition temperature.
[0031] 2. Physical barrier effect: Inhibits thermo-oxidative degradation and heat transfer. Uniformly dispersed nano-silica particles form a dense physical barrier within the PU matrix. As heat and oxygen attempt to diffuse into the material, these sheet-like or spherical nanoparticles force the heat flow and oxygen pathways to become tortuous and lengthy, significantly slowing down the rates of heat conduction and oxygen diffusion.
[0032] Free radical capture: During thermo-oxidative aging, PU molecular chains break down, generating highly reactive free radicals that trigger a chain degradation reaction. The silanol groups on the surface of nano-silica can capture these free radicals, terminating the chain reaction and thus inhibiting the continuous degradation of the material at high temperatures, improving long-term thermal stability and anti-aging properties.
[0033] 3. Molecular chain segment movement restriction: increasing the glass transition temperature. The soft segments of PU are in an amorphous, highly elastic state at room temperature, allowing for free movement of the chain segments. When the temperature rises above its glass transition temperature, the movement of these soft segments intensifies, causing the material to soften rapidly and its modulus to drop sharply. Nanoscale silica particles possess extremely high specific surface area and rigidity. They are tightly bound to the PU molecular chains through strong interfacial interactions (physical adsorption and the aforementioned chemical bonding). These "hard nodes" strongly restrict the movement of the surrounding PU molecular chains (especially the soft segments). For the material to transition from the glassy state to the highly elastic state, more energy is required to overcome the binding effect of the silica particles. Therefore, the glass transition temperature of the composite material shifts towards higher temperatures. This means that at the same high temperature, the silica / PU composite material maintains its hardness and modulus better than pure PU, i.e., it has a higher heat distortion temperature.
[0034] 4. Increased cross-linking density: Constructing a more complete three-dimensional network: The introduction of silica adds additional, rigid crosslinking points to the PU network. Higher crosslinking density means tighter connections between molecular chains and a more complete network. This not only improves the mechanical strength at room temperature, but more importantly, at high temperatures, the molecular chains need to work together to overcome the constraints of more connection points to flow or creep, thus significantly improving the material's high-temperature dimensional stability and creep resistance.
[0035] The function and principle of melt flow index improvers: 1. Interface lubrication: During melt extrusion, modifiers migrate to the interface between the melt and the screw / barrel wall, forming a weak boundary layer. This lubricating film significantly reduces the adhesion and friction between the polymer melt and the metal surface, making it easier for the melt to undergo overall wall slip during extrusion, rather than pure viscous shear flow. This directly results in a significant increase in melt output under the same screw thrust, macroscopically manifested as an increase in the measured melt index.
[0036] 2. Decoupling of in-melt lubrication and entanglement: The modifier can be uniformly dispersed between HDPE molecular chains, acting as a "molecular lubricant." These long-chain lubricant molecules are flexible and interspersed between the HDPE macromolecular chains, reducing the mutual resistance during the movement of HDPE chain segments.
[0037] The principle behind the good compatibility between high-density polyethylene and phase change microcapsules: 1. Chemical Compatibility and Surface Energy Matching: The polyurethane molecular chain contains both polar urethane groups and non-polar flexible segments. This structure provides excellent chemical similarity to non-polar high-density polyethylene (HDPE), enabling effective van der Waals interactions. More importantly, silica grafting modification allows for precise control of the microcapsule shell's surface chemistry, making its surface energy even closer to that of HDPE. This ensures that during melt blending, the HDPE polymer chains effectively wet the microcapsule surface, reducing interphase defects and laying the foundation for strong bonding.
[0038] 2. The "bridging" role of silica: Silica nanoparticles are introduced into the polyurethane shell material via grafting technology. The abundant silanol groups on their surface can form strong chemical bonds with the polyurethane molecular chains. After hydrophobic modification, the long-chain alkanes and other hydrophobic groups grafted onto the silica surface exhibit excellent compatibility with the non-polar structure of high-density polyethylene. Thus, the silica bridge achieves a smooth transition from inorganic silica to organic polyurethane, and then to high-density polyethylene at the microscopic level, playing a crucial "molecular bridging" role.
[0039] 3. Microscopic Mechanical Interlocking and Interfacial Reinforcement: The nano-silica particles distributed within the polyurethane shell increase the microscopic roughness of the shell surface. During composite molding, the molten high-density polyethylene molecular chains can penetrate and anchor within these nanoscale uneven structures, forming a mechanical interlocking effect, thereby further enhancing interfacial bonding. This excellent interfacial compatibility can significantly improve the mechanical properties of the composite material.
[0040] Example 1: A method for preparing a core-sheath structure phase change temperature-controlled fiber includes the following steps: Step 1: Raw material preparation and pretreatment, including: ①Preparation of dermal materials: PA6 Slice Drying: Place PA6 slices in a vacuum drum dryer and dry them at 100-120℃ and -0.1MPa for 12-24 hours to ensure that the moisture content is reduced to below 0.05% to prevent hydrolysis during melting.
[0041] ② Core layer masterbatch preparation: The core layer uses melt-spun phase change fiber temperature-controlled masterbatch: the melt-spun phase change fiber temperature-controlled masterbatch is dried at 60-80℃ for 4-8 hours to remove surface moisture and prevent air bubbles from being generated during spinning.
[0042] Step 2: Two-component melting and partitioning, including: ①Peel melting: PA6 chips are melted using a dedicated screw extruder for the skin layer. The screw temperatures are set as follows: Zone 1 240℃, Zone 2 255℃, Zone 3 265℃, and Die Head 270℃. The melt temperature needs to be precisely controlled between 265-275℃.
[0043] ②Core layer melting: The melt-spun phase change fiber temperature-controlled masterbatch is melted through a dedicated screw extruder for the core layer. Due to the heat resistance of PE and PCM, lower temperatures are required. The settings are: Zone 1 160℃, Zone 2 180℃, Zone 3 190℃, and die head 200℃.
[0044] ③Precision measurement: Peel pump: PA6 melt enters gear metering pump A for precise control of output volume.
[0045] Core layer pump: The masterbatch melt enters the gear metering pump B, and the output volume is precisely controlled.
[0046] Sheet-core ratio control: By adjusting the speed of the two metering pumps, the volumetric flow ratio of the skin and core layers is precisely controlled, with the skin-core ratio between 60:40 and 70:30.
[0047] Step 3: Composite spinning and forming: ① Melt composite: The two melts enter the composite spinning assembly through pipes.
[0048] ②Sheet core spinning: The two molten materials converge in the chamber above the spinneret and are extruded together through the spinneret orifice of the specially designed core-type spinneret under pressure.
[0049] Step 4: Cooling, oiling and winding ① Side-blowing cooling: The core-sheath melt stream enters the spinning channel and is cooled by a constant temperature (18-22℃), constant humidity, and uniform speed side-blowing airflow, solidifying into solid fibers.
[0050] Cooling conditions must be gentle and uniform to prevent fiber bending or uneven structure caused by different cooling crystallization rates of the skin and core layers (PA6 and PE have large differences).
[0051] ② Apply oil: The cured fiber bundles are oiled with a spinning oil. The oil should have good affinity for the PA6 skin to ensure smooth subsequent processing.
[0052] ③ Pre-network and winding: After being oiled, the fiber bundles are guided by a guide disc and wound into a cylinder on a high-speed winding machine to form a core-sheath composite pre-oriented yarn (POY). The winding speed is usually between 3000-4500 m / min.
[0053] Step 5: Post-stretching and shaping ①Stretching and heat setting: FDY process: POY undergoes further processing on a stretching and twisting machine or a hot roll stretching machine. The fibers pass through in sequence: First hot roller: preheated and initially stretched at 70-90℃.
[0054] Second hot roller: Main stretching and heat setting are performed at 120-150℃.
[0055] ② Shaping: Shaping is completed on the second hot roller to eliminate internal stress, stabilize the fiber structure, and at the same time "lock" the core-sheath shape to ensure that the PCM is permanently encapsulated in the core layer.
[0056] ③ Winding and shaping: After being stretched and shaped, the highly oriented yarn (FDY) is wound into a finished yarn spool under appropriate tension.
[0057] The prepared fiber has the specifications of FDY70D / 48F, a fineness of 78.2 dtex, a breaking strength of 3.03 cN / dtex, a coefficient of variation of 2.78%, a breaking elongation of 37.96%, and an enthalpy of 15.7 J / g.
[0058] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
Claims
1. A temperature-controlled masterbatch for melt-spun phase change fibers, characterized in that, The following components are included by weight: High-density polyethylene matrix, 40-60 parts; High-temperature resistant phase change microcapsules, 30-50 parts; Three-dimensional porous soft polymer, 5-10 parts; Melt index improver, 1-5 parts.
2. The temperature-controlled masterbatch for melt-spun phase change fiber according to claim 1, characterized in that, The high-temperature resistant phase change microcapsule comprises a core material and a shell material. The core material is a ternary eutectic bio-based phase change material, and the shell material is a modified polyurethane-grafted silica composite shell material. The ternary eutectic bio-based phase change material is composed of decanoic acid, lauric acid, and palmitic acid.
3. The temperature-controlled masterbatch for melt-spun phase change fiber according to claim 1, characterized in that, The phase transition temperature range of the high-temperature resistant phase change microcapsules is 26-30℃.
4. The temperature-controlled masterbatch for melt-spun phase change fiber according to claim 1, characterized in that, The three-dimensional porous soft polymer is a porous oil-absorbing resin.
5. The temperature-controlled masterbatch for melt-spun phase change fiber according to claim 1, characterized in that, The melt flow index improver is maleic anhydride-grafted polyethylene.
6. A method for preparing a temperature-controlled masterbatch for melt-spun phase change fibers as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Preparation of high-temperature resistant phase change microcapsules; S2, Raw material mixing; S3, melt extrusion granulation; S4, Post-processing; Step S1 includes core material preparation and shell material preparation; The preparation of the core material includes: mixing decanoic acid, lauric acid and palmitic acid in a ratio of 8:1:1, melting at 60-80°C, and stirring at 300-500 rpm for 1 hour to obtain a phase change core material; The shell material preparation includes: functionalization of nano-silica, synthesis of silica-grafted modified polyurethane prepolymer, and encapsulation molding of phase change microcapsules. The functionalization of the nano-silica includes: mixing and reacting nano-silica with polytetrahydrofuran ether diol at 100-120°C for 0.5-1 hour, so that polytetrahydrofuran ether diol is grafted onto the surface of silica, and silica-grafted polytetrahydrofuran diol is prepared. The synthesis of the silica-grafted modified polyurethane prepolymer includes: reacting silica-grafted polytetrahydrofuran diol with isocyanate at 70-85°C under nitrogen protection for 1-3 hours to prepare the silica-modified polyurethane prepolymer. The encapsulation and molding of the phase change microcapsules includes: preparation of a prepolymer dispersion containing phase change material, interfacial polymerization chain extension, and post-treatment; the preparation of the prepolymer dispersion containing phase change material includes: cooling a silica-modified polyurethane prepolymer to below 50°C, adding alkali to neutralize the hydrophilic groups in the silica-modified polyurethane prepolymer, with a neutralization degree of 50%-100%, adding the phase change core material to the neutralized prepolymer under high-speed shear, and slowly adding deionized water under high-speed stirring to obtain a polyurethane prepolymer dispersion containing phase change material; The interfacial polymerization chain extension includes: slowly adding an aqueous organic amine solution to a polyurethane prepolymer dispersion containing a phase change material under stirring, and reacting to form a polyurethane wall material.
7. The method for preparing a fiber-grade phase change temperature-controlled masterbatch according to claim 6, characterized in that, The post-processing includes demulsification, filtration, washing, and drying.