Non-woven fabric for sunshade curtains and preparation process thereof

Abstract

The present invention relates to the technical field of nonwoven fabrics for curtains, and more particularly to a nonwoven fabric for sunshade curtains and a preparation process thereof. The present invention relates to a preparation process for sunshade curtains, wherein PET fibers, LPET fibers, and long fibers with excellent mechanical properties are used as raw materials, and the distance between the tying points of web-setting hot rollers and the hot pressing temperature are selected. Furthermore, a polyurethane coating containing an anti-ultraviolet additive is added to the sunshade curtain nonwoven fabric. The resulting sunshade curtain nonwoven fabric not only has excellent mechanical properties and stiffness, but also good air permeability.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabrics for curtains, in particular to a non-woven fabric for sunshade curtains and a preparation process thereof. Background Art

[0002] Traditional curtains are woven, using soft, draping textiles without a supporting frame and a simple design. With economic development, curtains are required to provide not only sunshade functions but also thermal insulation and beautify the interior environment. Pleated curtains, Venetian blinds, and honeycomb shades are now commonly used in offices and small bedrooms. These curtains not only provide thermal insulation but also minimize the window area when folded up, saving space and creating a greater sense of space.

[0003] Due to the high softness and good adsorption properties of non-woven fabrics, non-woven fabrics are often used to produce interior sunshade curtains such as folding curtains, venetian blinds, and honeycomb curtains. In order to meet the needs of being frequently stored and folded, non-woven fabrics used as interior sunshade curtains such as folding curtains, venetian blinds, and honeycomb curtains are required to have certain mechanical properties and stiffness. However, if the mechanical properties and stiffness of the non-woven fabric are too high, the air permeability and softness of the non-woven fabric may deteriorate. Summary of the Invention

[0004] In order to improve the problem that existing non-woven fabrics for curtains are difficult to simultaneously meet the requirements of good mechanical properties, stiffness, and excellent air permeability, the present application provides a non-woven fabric for sunshade curtains and a preparation process thereof.

[0005] In a first aspect, the present application provides a process for preparing non-woven fabric for sunshade curtains, which adopts the following technical solution: A process for preparing non-woven fabric for sunshade curtains, comprising the following preparation steps:

[0006] Mixed fiber combing and web shaping to produce non-woven fabric for sunshade curtains;

[0007] The mixed fibers in the mixed fiber combing step include 70-80 parts by weight of PET fiber and 20-30 parts by weight of LPET fiber; the melting point of the PET fiber is 250-255°C, and the melting point of the LPET fiber is 140-200°C; the length of adjacent rolling points of the hot rolling roller in the fiber web shaping is 0.8-2.0 mm; the hot pressing temperature of the fiber web shaping is 210-220°C.

[0008] By adopting the above technical solution, PET fibers and LPET fibers are combed to become a fiber web in which PET fibers and LPET fibers are evenly mixed. After the distance between the pricking points of the fiber web shaping hot rolling rollers and the hot pressing temperature are selected, the prepared non-woven fabric not only has excellent mechanical properties and stiffness, but also has good air permeability.

[0009] PET and LPET fibers possess excellent mechanical properties. The hot-pressing process bonds the fibers together, forming a single unit. If the adjacent nip points of the hot-pressing rollers are too close together during web shaping, the resulting nonwoven fabric will exhibit high stiffness and excellent mechanical properties, but its air permeability will deteriorate. If the hot-pressing temperature is too high, the LPET fibers will soften and deform excessively. After hot-melting, the LPET fibers at the nip points will clog the gaps between the fibers, reducing the fabric's air permeability and softness. Choosing the appropriate hot-pressing temperature and the appropriate distance between the nip points of the hot-pressing rollers ensures that the nonwoven fabric not only possesses excellent mechanical properties and stiffness, but also good air permeability.

[0010] Preferably, the mixed fiber further comprises 4-8 portions of long fibers, the length of the long fibers is greater than 50 cm, and the long fibers are arranged along the length direction of the non-woven fabric for sunshade curtains.

[0011] By adopting the above technical solution, long fibers are added to the mixed fibers along the length direction of the non-woven fabric for sunshade curtains, thereby enhancing the synergistic effect between the fibers in the length direction of the non-woven fabric for sunshade curtains, thereby enhancing the tensile strength of the non-woven fabric in the length direction.

[0012] If the length of the long fiber is too short, the synergistic reinforcement effect between the fibers in the length direction of the non-woven fabric for sunshade curtains is weak and not obvious.

[0013] Preferably, the long fiber has a skin-core structure, the skin layer is made of PET or PE with a melting point of 140-180°C, the core layer is made of PET with a melting point of 250-255°C, and the mass ratio of the skin layer to the core layer is (0.4-0.6):1.

[0014] By adopting the above technical solution, by setting the long fibers as a skin-core structure, the long fibers are better bonded with the PET fibers and LPET fibers, thereby enhancing the synergistic performance between the PET fibers and the LPET fibers, and thereby enhancing the strength of the non-woven fabric for sunshade curtains.

[0015] If the melting point of the cortex is too low and the mass ratio of the cortex to the core layer is too high, during the hot pressing process of the non-woven fabric, the cortex may melt and block the gaps between the non-woven fabric fibers, resulting in poor air permeability.

[0016] Preferably, a coating mixture is sprayed on the non-woven fabric for sunshade curtains to form a polyurethane coating on the non-woven fabric for sunshade curtains; the coating mixture includes diisocyanate, diol, tetrahydrofuran, phenol and dibutyltin dilaurate, the molar ratio of the diisocyanate to the diol is (1-2):1, and the mass ratio of the tetrahydrofuran, phenol and dibutyltin dilaurate to the diol is (0.9-3.2):(0.1-0.4):(0.004-0.008):1.

[0017] By adopting the above technical solution, the strength of the polyurethane coating and the bonding strength between the polyurethane coating and the non-woven fabric for sunshade curtains are controlled by controlling the molar ratio of diisocyanate to diol, thereby affecting the mechanical properties of the non-woven fabric for sunshade curtains with composite polyurethane coating.

[0018] Control the tetrahydrofuran content in the coating mixture to control the film-forming speed of the polyurethane coating and the number and morphology of the micropores in the polyurethane coating, thereby controlling the air permeability and feel of the composite polyurethane-coated non-woven fabric for curtains. If the number of micropores in the polyurethane coating is too small, the air permeability is poor. If the number of micropores is too large, large openings are formed on the surface of the polyurethane coating. The mechanical properties of the polyurethane coating and the composite polyurethane-coated non-woven fabric for curtains may also decrease, and the feel is poor.

[0019] At room temperature, dibutyltin dilaurate and phenol can block diisocyanates. At elevated temperatures, dibutyltin dilaurate catalyzes the reaction between diisocyanates and diols. By combining dibutyltin dilaurate and phenol, the coating mixture forms a polyurethane coating under appropriate conditions. The microporous polyurethane coating exhibits excellent air permeability and mechanical properties. The optimal molar ratio of diisocyanate to diol ensures strong bonding and synergy between the polyurethane coating and the curtain nonwoven fabric, thereby enhancing the mechanical properties of the composite polyurethane-coated curtain nonwoven fabric.

[0020] Preferably, the coating mixture is sprayed on the non-woven fabric for the sunshade curtain, and the coating mixture further includes castor oil, and the mass ratio of the castor oil to the diol is (0.25-0.35):1.

[0021] By adopting the above technical solution, castor oil is added to the coating mixture. The polyhydroxy castor oil enhances the mechanical properties of the polyurethane coating. At the same time, the unreacted side chains of the castor oil make the polyurethane coating softer, and the polyhydroxy properties of the castor oil further enhance the breathability of the polyurethane coating.

[0022] Preferably, the coating mixture also includes an anti-ultraviolet additive, the mass ratio of the anti-ultraviolet additive to the diol is (0.09-0.28):1, and the anti-ultraviolet additive is at least one of titanium dioxide, zinc oxide, kaolin, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine and hexamethylphosphoric triamide.

[0023] By adopting the above technical solution, an anti-ultraviolet additive is added to the polyurethane coating, so that the polyurethane coating has anti-ultraviolet performance, thereby enhancing the sunshade performance of the non-woven fabric for sunshade curtains.

[0024] Preferably, the anti-ultraviolet additive is a composition of kaolin and hexamethylphosphoric triamide, and the mass ratio of the kaolin to the hexamethylphosphoric triamide is 1:(1-3).

[0025] By adopting the above technical solution, kaolin and hexamethylphosphoric triamide are preferably selected among the anti-ultraviolet additives, thereby further enhancing the anti-ultraviolet and sun-shading properties of the non-woven fabric for sunshade curtains.

[0026] The anti-ultraviolet effect of adding a single anti-ultraviolet additive to the polyurethane coating is not ideal. The anti-ultraviolet performance of the polyurethane coating is enhanced by compounding organic and inorganic anti-ultraviolet additives.

[0027] Since anti-UV additives may cause the mechanical properties of the polyurethane coating to deteriorate and clog the micropores in the polyurethane coating, resulting in poor air permeability, this application prefers the types and usage amounts of organic and inorganic anti-UV additives, and their compounding with castor oil in the polyurethane coating, so as to enhance the anti-UV performance of the polyurethane coating while making the polyurethane coating have excellent mechanical properties and air permeability.

[0028] Preferably, the preparation process of the polyurethane coating includes the following preparation steps:

[0029] Preparation of coating mixture: diol, dibutyltin dilaurate, tetrahydrofuran, castor oil and anti-ultraviolet additive are mixed at a temperature of 70°C and a rotation speed of 300 r / min for 30 minutes, then mixed with diisocyanate and tetrahydrofuran, and reacted at 70-80°C for 2-4 hours to obtain a coating prepolymer mixture; the coating prepolymer mixture is cooled to 25°C, and dibutyltin dilaurate phenol is added for end-capping to obtain a coating mixture;

[0030] Spraying: Cool the non-woven fabric after the web is shaped to 35°C, and then spray the coating mixture on the non-woven fabric after the web is shaped;

[0031] Film formation: The non-woven fabric sprayed with the coating mixture is placed at a temperature of 60-80° C. and an ambient humidity of 45%-65% for 3-5 hours to obtain a non-woven fabric for curtains with a polyurethane coating.

[0032] By adopting the above technical solution, the coating mixture is prepared into a coating prepolymer mixture, and then dibutyltin phenol dilaurate is added to cap the isocyanate and terminate the reaction. After the coating prepolymer mixture is sprayed on the non-woven fabric for sunshade curtains, the reaction continues under certain temperature and humidity conditions. During the reaction process, a film is formed under the conditions of tetrahydrofuran at 60-80°C and an ambient humidity of 45%-65%. During the film formation process, as the tetrahydrofuran solvent evaporates and water molecules from the environment enter the coating, the formed polyurethane coating has a fine microporous structure. At the same time, water vapor in the air enters the microchannels and reacts with the isocyanate, forming microchannels in the polyurethane coating, giving the polyurethane coating a microporous structure. The composite polyurethane-coated non-woven fabric for curtains has good air permeability and a soft feel.

[0033] Since inorganic anti-UV additives may cause the mechanical properties of the polyurethane coating to deteriorate and clog the micropores in the polyurethane coating, resulting in poor air permeability, castor oil and anti-UV additives are used in combination in this application, so that the anti-UV additives have better compatibility with the polyurethane coating, enhance the mechanical properties of the polyurethane coating and further enhance the air permeability of the polyurethane coating.

[0034] Preferably, before the mixed fiber combing step, the PET fiber and the LPET fiber are surface pretreated with a surface treatment liquid, wherein the surface treatment liquid is a mixture of sulfuric acid, ferric chloride and water, and the sulfuric acid concentration in the surface treatment liquid is 14-20%.

[0035] By adopting the above technical solution, the PET fiber and the LPET fiber are surface pretreated with a surface treatment liquid, so that the surface of the PET fiber and the LPET fiber has hydrophilic groups, thereby enhancing the bonding strength and synergistic performance between the non-woven fabric for sunshade curtains and the polyurethane coating, thereby making the non-woven fabric for curtains composited with the polyurethane coating have better mechanical properties.

[0036] In a second aspect, the present application provides a non-woven fabric for sunshade curtains.

[0037] A non-woven fabric for sunshade curtains is prepared by adopting the preparation process of the non-woven fabric for sunshade curtains in the present application.

[0038] By adopting the above technical solution, the non-woven fabric for sunshade curtains obtained not only has excellent mechanical properties and stiffness, but also has excellent air permeability and softness, and can be used to prepare sunshade curtains, such as pleated curtains, venetian blinds, and honeycomb curtains.

[0039] In summary, this application has the following beneficial effects:

[0040] 1. A preparation process for non-woven fabrics for sunshade curtains, which uses PET fiber and LPET fiber with excellent mechanical properties as raw materials, and selects the distance between the pricking points of the fiber web shaping hot roller and the hot pressing temperature, so that the prepared non-woven fabrics for sunshade curtains not only have excellent mechanical properties and hardness, but also have good air permeability.

[0041] 2. In the preparation process of non-woven fabric for sunshade curtains, in the mixed fiber combing step, long fibers are added to the mixed fibers. The long fibers are arranged along the length direction of the non-woven fabric for sunshade curtains, and the long fibers have a skin-core structure. The fiber web is shaped and the long fibers enhance the synergistic properties between the PET fibers and the LPET fibers, thereby enhancing the strength of the non-woven fabric for sunshade curtains, especially enhancing the longitudinal tensile strength of the non-woven fabric for sunshade curtains in the length direction.

[0042] 3. The present application composites a polyurethane coating on the non-woven fabric for sunshade curtains, wherein an anti-ultraviolet additive is added to the polyurethane coating. The polyurethane coating has a microporous structure and excellent air permeability, so that the non-woven fabric for sunshade curtains has excellent mechanical properties and anti-ultraviolet properties. DETAILED DESCRIPTION

[0043] PET fiber (1.5d*38), LPET fiber (1.5d*38), long fiber (1.5d, length 150cm), polytetramethylene ether glycol (CAS: 25190-06-1, molecular weight about 250, purity ≥99.5%), 1,4-butanediol (CAS: 110-63-4, molecular weight about 90.12), polyethylene glycol (CAS: 25322-68-3, molecular weight about 800), diphenylmethane diisocyanate (MDI, CAS: 5101-68-8, molecular weight: 366), hexamethylene diisocyanate (HDI, CAS: 822-06-0, molecular weight: 168), dimethylbiphenyl diisocyanate (MDI, CAS: 5101-68-8, molecular weight: 366), Cyanate ester (CAS: 91-97-4, molecular weight: 264), castor oil (CAS: 8001-79-4, molecular weight approximately 929.26), dibutyltin dilaurate (CAS: 77-58-7, tin content: 18.5 ± 0.5%), tetrahydrofuran (CAS: 109-99-9), phenol (CAS: 108-95-2), 4-benzoyloxy-2,2,6,6-tetramethylpiperidine (CAS: 3225-26-1), hexamethylphosphoric triamide (CAS: 680-31-9), titanium dioxide (CAS: 13463-67-7), zinc oxide (average particle size approximately 5 microns), and kaolin (average particle size approximately 20.3 microns).

[0044] Example

[0045] Preparation Example 1

[0046] A coating mixture, using the raw material components shown in Table 1, is prepared as follows:

[0047] Mixing diol, dibutyltin dilaurate (1), tetrahydrofuran (1), castor oil and anti-ultraviolet additive at a temperature of 70°C and a rotation speed of 300 r / min for 30 minutes, then mixing diisocyanate with tetrahydrofuran (2) and uniformly dropping the mixture into the mixture of diol, dibutyltin dilaurate (1), tetrahydrofuran (1) and anti-ultraviolet additive through a burette, and reacting at 70°C for 4 hours to obtain a coating prepolymer mixture; cooling the coating prepolymer mixture to 25°C, adding dibutyltin dilaurate (2) and phenol for end-capping, and obtaining a coating mixture;

[0048] The diisocyanate is diphenylmethane diisocyanate, the diol is polytetramethylene ether glycol, and the polytetramethylene ether glycol and castor oil are dehydrated at 120° C. for 2 h before use.

[0049] Preparation Example 2-4

[0050] A coating mixture, which differs from Preparation Example 1 in that the types and weights of the raw materials used in the coating mixture and the reaction condition parameters for preparing the coating prepolymer mixture are different, as shown in Table 1:

[0051] Table 1: Types and weights of raw materials used in the preparation of coating mixtures in Examples 1-4 and the setting of reaction parameters for the preparation of coating prepolymer mixtures

[0052]

[0053]

[0054]

[0055]

[0056] Preparation Example 5

[0057] A coating mixture, which differs from Preparation Example 1 in that the coating mixture further includes castor oil, and the weight of the castor oil is shown in Table 2.

[0058] Preparation Examples 6-9

[0059] A coating mixture, which differs from Preparation Example 5 in that the weight parameter setting of castor oil is different, as shown in Table 2:

[0060] Table 2 Weight list of castor oil in the mixed solution of Preparation Examples 5-9

[0061]

[0062] Preparation Examples 10-12

[0063] A coating mixture, which differs from Preparation Example 1 in that, when the weights of kaolin and hexamethylphosphoric triamide in the anti-ultraviolet additive are constant, the weight ratio of kaolin to hexamethylphosphoric triamide is set differently, as shown in Table 3:

[0064] Table 3 Setting list of weight ratios of kaolin and hexamethylphosphoric acid triamide in Preparation Examples 10-12 and Preparation Example 1

[0065]

[0066] Example 1

[0067] A preparation process for non-woven fabric for sunshade curtains, using raw material components as shown in Table 4, and the preparation steps are as follows:

[0068] Surface pretreatment of mixed fibers - mixed fiber combing - fiber web shaping - coating preparation to produce non-woven fabric for sunshade curtains;

[0069] Surface pretreatment of mixed fibers: soak the PET fiber and LPET fiber in anhydrous ethanol for 2 hours, remove surface impurities, wash with distilled water, and dry at 65°C; use a surface treatment liquid to pretreat the surface of the PET fiber and LPET fiber at a bath ratio of 5:1; the surface treatment liquid is a mixture of sulfuric acid, ferric chloride, and water, wherein the mass concentration of sulfuric acid is 14% and the mass concentration of ferric chloride is 20%; the temperature of the surface treatment liquid is 35°C, and the pretreatment is carried out for 3 hours; after pretreatment, soak the PET fiber and LPET fiber in distilled water for 1 hour, drain, and dry at 60°C for 4 hours for later use.

[0070] Mixed fiber combing: the mixed fiber is discharged in the disc mixer according to the proportion, the PET fiber and LPET fiber are evenly picked up by the turntable and put into the mixing chamber, the PET fiber and LPET fiber are evenly picked up by the turntable and mixed together to form mixed fiber; the air volume parameters of the high cotton box are adjusted to make the mixed fiber form 20g / m 2 The fiber layer is pre-combed and combed, and the messy fibers are individually combed by adjusting the speed ratio of the card clothing to form a flat fiber web with a uniform mixture of PET fibers and LPET fibers.

[0071] Fiber web shaping: The fiber web is heated and melted in a hot rolling mill. The hot pressing temperature of the hot rolling mill is 210°C, the length of adjacent rolling points of the hot rolling roller is 0.8mm, and the pressure of the hot rolling roller is 20MPa. The fiber web is fused into one at the hot rolling point to produce a non-woven fabric.

[0072] Among them, the melting point of LPET fiber is 140℃, and the melting point of PET fiber is 250℃.

[0073] Coating preparation: The non-woven fabric after the fiber web is shaped is cooled to 35°C, and then sprayed in the coating mixture prepared in Preparation 1. The coating mixture is placed at a temperature of 40°C, with a bath ratio of 5:1, and sprayed for 10 minutes; then, it is allowed to stand for 3 hours in an environment with an air humidity of 45% and a temperature of 70°C to obtain a coated non-woven fabric for curtains.

[0074] Examples 2-4

[0075] A preparation process for a non-woven fabric for sunshade curtains differs from Example 1 in that the melting point and weight of the PET fiber and LPET fiber in the non-woven fabric for sunshade curtains, the hot pressing temperature, the length of adjacent nipples, the reaction temperature and time of the AB mixture, the ambient humidity, temperature and time during film formation, and the settings of the coating mixture used are different, as shown in Table 4:

[0076] Table 4 Melting point and weight of PET fiber and LPET fiber in nonwoven fabric for sunshade curtain of Example 1-4, hot pressing temperature, length of adjacent nip points, ambient humidity, temperature and time during film formation, and setting list of coating mixture used

[0077]

[0078] Examples 5-9

[0079] A preparation process for a non-woven fabric for sunshade curtains. The difference from Example 1 is that the mixed fiber also includes long fibers, the long fibers have a sheath-core structure, the sheath and the core are both made of PET, and the long fibers are arranged along the length direction of the non-woven fabric for sunshade curtains. The difference between Examples 5-9 is the length and amount of the long fibers in the mixed fiber, the weight ratio of the sheath and the core layer of the long fibers, and the melting point settings are different, as shown in Table 5.

[0080] Table 5 Setting list of the weight of long fibers in Examples 5-9

[0081] distinguish Example 5 Example 6 Example 7 Example 8 Example 9 Length of long fiber / cm 100 300 150 50 30 Long fiber dosage / kg 2 4 6 8 10 Skin to core mass ratio 0.3:1 0.4:1 0.5:1 0.6:1 0.7:1 Cortex melting point / ℃ 120 180 160 140 200 Core layer melting point / ℃ 240 255 253 250 265

[0082] Example 10

[0083] A preparation process of non-woven fabric for sunshade curtains, which differs from Example 5 in that the long fibers are not provided with a sheath-core structure and have a melting point of 190°C.

[0084] Example 11

[0085] A preparation process of non-woven fabric for sunshade curtains, which differs from Example 5 in that the cortex of the long fiber is made of PE material with a melting point of 120°C.

[0086] Examples 12-19

[0087] A preparation process of non-woven fabric for sunshade curtains is different from Example 1 in that the coating mixtures used are the coating mixtures prepared in Preparation Examples 5-12 respectively.

[0088] Example 20

[0089] A preparation process of non-woven fabric for sunshade curtains, which differs from Example 1 in that the non-woven fabric for sunshade curtains is not sprayed with a coating mixture, and the PET fiber and the LPET fiber are not surface pretreated with a surface treatment liquid.

[0090] Example 21

[0091] A preparation process for non-woven fabric for sunshade curtains, which differs from Example 1 in that no anti-ultraviolet additives and castor oil are added to the coating mixture.

[0092] Example 22

[0093] A preparation process of non-woven fabric for sunshade curtains, which differs from Example 1 in that the PET fiber and the LPET fiber are not surface pretreated with a surface treatment liquid.

[0094] Example 23

[0095] A preparation process of non-woven fabric for sunshade curtains, which differs from Example 1 in that: the ambient humidity when the coating mixture is formed into a film is 30% and the film forming temperature is 90°C.

[0096] Comparative Example

[0097] Comparative Example 1

[0098] A preparation process for non-woven fabric for sunshade curtains, which differs from Example 20 in that: the hot pressing temperature is set to 260°C, the length of adjacent nip points of the hot rolling roller is 0.5 mm, and the melting point of LPET fiber is 110°C.

[0099] Comparative Example 2

[0100] A preparation process of UV-proof nonwoven fabric: in the common commercial weight of (35-50) ± 2g / m 2 The anti-ultraviolet non-woven fabric is made by spraying VK-T31H anti-ultraviolet finishing agent on the PET non-woven fabric.

[0101] Performance testing

[0102] Test 1: Mechanical Strength

[0103] Test method: GB-T24218.3-2010 "Textiles - Test methods for nonwoven fabrics"

[0104] Test samples: The non-woven fabrics for sunshade curtains prepared in Examples 1-23 were used as test samples, and the non-woven fabrics for sunshade curtains prepared in Comparative Examples 1-2 were used as control samples.

[0105] Test results: The test results of the longitudinal tensile strength of the non-woven fabrics for sunshade curtains prepared in Examples 1-23 and Comparative Examples 1-2 are shown in Table 6:

[0106] Test 2: Air Permeability Test Method: Use an air permeability meter to measure the air permeability of two sets of nonwoven fabrics. This is usually expressed as air permeability, which is the volume of air passing through a unit area of ​​the nonwoven fabric per unit time under the condition of maintaining a certain pressure difference on both sides of the nonwoven fabric. This is calculated according to the formula: BP (ml / cm²·s) = V / AF*T; where V is the volume of air passing through the nonwoven fabric in T seconds (mL); AF is the area of ​​the nonwoven fabric (cm²). The air permeability of the nonwoven fabric is characterized by measuring the air flow rate vertically through the sample per unit time under a specified pressure.

[0107] Test samples: The non-woven fabrics for sunshade curtains prepared in Examples 1-23 were used as test samples, and the non-woven fabrics for sunshade curtains prepared in Comparative Examples 1-2 were used as control samples.

[0108] Test results: The air permeability test results of the non-woven fabrics for sunshade curtains prepared in Examples 1-23 and Comparative Examples 1-2 are shown in Table 6:

[0109] Table 6 Longitudinal tensile strength and air permeability of the non-woven fabrics for sunshade curtains prepared in Examples 1-23 and Comparative Examples 1-2

[0110]

[0111]

[0112] Combining Examples 1-23 and Comparative Examples 1-2 and Table 6, it can be seen that:

[0113] The longitudinal tensile strength of the non-woven fabric for sunshade curtains prepared in Examples 1-23 is 308-378 N / 5cm, and the longitudinal tensile strength of the non-woven fabric for sunshade curtains prepared in Comparative Examples 1-2 is 186-236 N / 5cm, indicating that the non-woven fabric for sunshade curtains has excellent mechanical properties by setting the hot pressing temperature in the preparation process of the non-woven fabric for sunshade curtains, setting the length of adjacent rolling points of the hot rolling rollers, and preferably adjusting the melting point and weight of LPET fiber and PET fiber, adding long fibers, and compositely coating the non-woven fabric for sunshade curtains with a polyurethane coating.

[0114] The air permeability of the non-woven fabrics for sunshade curtains prepared in Examples 1-5 and 10-23 is 84.3-95.0 ml / cm 2·s; and the air permeability of the non-woven fabric for sunshade curtains prepared in Comparative Examples 1-2 was 80.5-82.2 ml / cm 2 ·s, indicating that by setting the hot pressing temperature in the preparation process of the non-woven fabric for sunshade curtains, setting the length of the adjacent nip points of the hot rolling rollers, and preferably adjusting the melting point and weight of the LPET fiber and the PET fiber, adding long fibers, and compositely coating the non-woven fabric for sunshade curtains with a polyurethane coating, the longitudinal tensile strength of the non-woven fabric for sunshade curtains in the present application is significantly improved, while the air permeability does not decrease significantly, and is better than the air permeability of the anti-ultraviolet non-woven fabric prepared by spraying a commercially available anti-ultraviolet finishing agent on an ordinary commercially available PET non-woven fabric.

[0115] The air permeability of the non-woven fabric for sunshade curtains prepared in Examples 12-19 is 93.5-94.8 ml / cm 2 ·s, the air permeability of the nonwoven fabric for sunshade curtains prepared in Example 20 is 91.0 ml / cm 2 ·s. It can be seen that the air permeability of the non-woven fabric for sunshade curtains after being composited with polyurethane coating has a downward trend. However, by optimizing the formula of the coating mixture and the polyurethane coating film-forming process, the polyurethane coating has a better air permeability, and the longitudinal tensile strength of the non-woven fabric for sunshade curtains after being composited with polyurethane coating is significantly enhanced, while the air permeability does not decrease significantly. The above beneficial effects may be due to the microporous structure and good air permeability of the polyurethane coating, and the synergistic and coordinated use of castor oil and kaolin not only improves the mechanical properties of the polyurethane coating and the non-woven fabric composited with polyurethane coating.

[0116] Test 3: Stiffness test method: Test in accordance with GB / T18318-2001 "Determination of the bending length of textile fabrics". Cut the sample size of non-woven fabric for sunshade curtains into 25cm×2.5cm, use LFY-207 automatic fabric stiffness tester to test, calculate the bending length C of the sample, the larger the value, the stiffer the fabric.

[0117] Test samples: The non-woven fabrics for sunshade curtains prepared in Examples 1-20 were used as test samples, and the non-woven fabrics for sunshade curtains prepared in Comparative Examples 1-2 were used as control samples.

[0118] Test results: The test results of the stiffness of the non-woven fabrics for sunshade curtains prepared in Examples 1-20 and Comparative Examples 1-2 are shown in Table 7:

[0119] Table 7 Stiffness of non-woven fabrics for sunshade curtains prepared in Examples 1-20 and Comparative Examples 1-2

[0120] distinguish Hardness (cm) distinguish Hardness (cm) Example 1 6.8 Example 12 6.5 Example 2 7.3 Example 13 6.2 Example 3 7.6 Example 14 6.1 Example 4 6.3 Example 15 5.8 Example 5 7.8 Example 16 5.6 Example 6 8 Example 17 6.6 Example 7 8.2 Example 18 6.4 Example 8 8.4 Example 19 6.1 Example 9 8.5 Example 20 5 Example 10 7.7 Comparative Example 1 4.3 Example 11 7.5 Comparative Example 2 3.5

[0121] Combining Examples 1-20 and Comparative Examples 1-2 and Table 7, it can be seen that:

[0122] The stiffness of the non-woven fabric for sunshade curtains prepared in Examples 1-20 ranges from 5.0 to 8.5 cm, which is higher than the stiffness of 3.5 to 4.3 cm in Comparative Examples 1-2. This indicates that the stiffness of the non-woven fabric for sunshade curtains is increased by setting the hot pressing temperature in the preparation process of the non-woven fabric for sunshade curtains, the length of adjacent rolling points of the hot rolling rollers, and the preferred melting point and weight of LPET fiber and PET fiber, as well as by compounding a polyurethane coating on the non-woven fabric for sunshade curtains.

[0123] Test 4: UV protection ability test test method: The American AATCC183-2004 standard is adopted. The AATCC standard adopts the spectrophotometer method. This method mainly uses a stable UV light source to generate ultraviolet rays with a wavelength of 280-400nm, irradiates the sample through a monochromator, collects the total spectral projection rays, measures the total spectral projection ratio, and calculates the ultraviolet protection factor UPF of the sample. The higher the ultraviolet protection factor UPF value, the better the ultraviolet protection effect.

[0124] Test samples: The non-woven fabrics for sunshade curtains prepared in Examples 1-5 and Examples 12-19 were used as test samples, and the non-woven fabrics for sunshade curtains prepared in Example 21 and Comparative Example 1 were used as control samples.

[0125] Test results: The anti-ultraviolet ability test results of the non-woven fabrics for sunshade curtains prepared in Examples 1-5, Examples 12-19, Example 21 and Comparative Example 1 are shown in Table 8

[0126] Table 8 UV protection factors of non-woven fabrics for sunshade curtains prepared in Examples 1-5, Examples 12-19, Example 21 and Comparative Example 1

[0127] distinguish Ultraviolet protection factor UPF distinguish Ultraviolet protection factor UPF Example 1 165 Example 14 175 Example 2 167 Example 15 173 Example 3 163 Example 16 169 Example 4 160 Example 17 170 Example 5 165 Example 18 166 Example 12 169 Example 19 161 Example 13 172 Example 21 100 Example 14 175 Comparative Example 2 85

[0128] The ultraviolet protection factor UPF of 160-175 of the non-woven fabrics for sunshade curtains prepared in Examples 1-5 and Examples 12-19 is higher than the ultraviolet protection factor UPF of 85-100cm in Example 21 and Comparative Example 2, indicating that compounding a polyurethane coating on the non-woven fabric for sunshade curtains and adding an anti-ultraviolet additive to the polyurethane coating not only increases the stiffness of the non-woven fabric for sunshade curtains but also has excellent anti-ultraviolet protection performance, and is superior to the anti-ultraviolet performance of the anti-ultraviolet non-woven fabric made by spraying a commercially available anti-ultraviolet finishing agent on an ordinary commercially available PET non-woven fabric.

[0129] Test 5: Thermal insulation performance test method: Refer to GB / T10294-2008 to measure the thermal conductivity of non-woven curtains used for sunshade curtains. 5 test samples are used and the test average value is taken.

[0130] Test samples: Example 1, Examples 12-19, Example 21 and Example 23 were used as test samples, and Comparative Example 2 was used as a control sample.

[0131] Test results: The thermal conductivity of the non-woven fabrics for sunshade curtains prepared in Example 1, Examples 12-19, Example 21, Example 23 and Comparative Example 2 is shown in Table 9.

[0132] Table 9 List of thermal conductivity coefficients of non-woven fabrics for sunshade curtains prepared in Example 1, Examples 12-19, Example 21, Example 23 and Comparative Example 2

[0133]

[0134]

[0135] The thermal conductivity of the non-woven fabric for sunshade curtains prepared in Example 1 and Examples 12-19 is 0.12-0.21 W / (m·℃), which is better than the thermal conductivity of the non-woven fabric for sunshade curtains prepared in Example 23, which is 0.25-0.35 W / (m·℃). This shows that the preferred ambient humidity and film-forming temperature during film formation of the coating mixture can improve the thermal insulation performance of the non-woven fabric for sunshade curtains. This may be because the ambient humidity and film-forming temperature during film formation of the coating mixture affect the microporous structure of the polyurethane coating, thereby affecting the thermal insulation performance of the polyurethane coating.

[0136] The thermal conductivity of the non-woven fabric for sunshade curtains prepared in Examples 1 and 12-19 is 0.12-0.21 W / (m·℃), which is better than the thermal conductivity of the non-woven fabric for sunshade curtains prepared in Example 21 of 0.27 W / (m·℃). This shows that the addition of anti-UV additives to the polyurethane coating can reflect or absorb light waves, thereby improving the thermal insulation performance of the non-woven fabric for sunshade curtains. The combination of castor oil and anti-UV additives can improve the compatibility of the added anti-UV additives with the polyurethane coating, maintain the continuity of the polyurethane coating, and not block the pore structure that may exist in the polyurethane coating, thereby improving the thermal insulation performance of the non-woven fabric for sunshade curtains.

[0137] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A process for preparing non-woven fabric for sunshade curtains, characterized in that: The method comprises the following preparation steps: Mixed fiber carding and web shaping to produce non-woven fabric for sunshade curtains; The mixed fibers in the mixed fiber combing step include 70-80 parts by weight of PET fibers and 20-30 parts by weight of LPET fibers; the melting point of the PET fibers is 250-255° C., and the melting point of the LPET fibers is 140-200° C.; the length of adjacent nipples of the hot rollers in the web shaping process is 0.8-2.0 mm; the hot pressing temperature for the web shaping process is 210-220° C.; the coating mixture is sprayed on the sunshade curtain nonwoven fabric to form a polyurethane coating on the sunshade curtain nonwoven fabric; The coating mixture includes diisocyanate, diol, tetrahydrofuran, phenol and dibutyltin dilaurate, wherein the molar ratio of the diisocyanate to the diol is (1-2):1, and the mass ratio of the tetrahydrofuran, phenol and dibutyltin dilaurate to the diol is (0.9-3.2):(0.1-0.4):(0.004-0.008):1; the coating mixture also includes castor oil and an anti-ultraviolet additive; the anti-ultraviolet additive is composed of kaolin and hexamethylphosphoric triamide in a mass ratio of 1:(1-3); The mixed fiber further comprises 4-8 parts of long fibers, the length of the long fibers being greater than 50 cm, and the long fibers being arranged along the length direction of the non-woven fabric for sunshade curtains; The long fiber has a skin-core structure, the skin layer is PET with a melting point of 140-180°C, the core layer is PET with a melting point of 250-255°C, and the mass ratio of the skin layer to the core layer is (0.4-0.6):

1.

2. The process for preparing a non-woven fabric for sunshade curtains according to claim 1, wherein: The mass ratio of the castor oil to the diol is (0.25-0.35):

1.

3. The process for preparing a non-woven fabric for sunshade curtains according to claim 1, wherein: The mass ratio of the anti-ultraviolet additive to the diol is (0.09-0.28):

1.

4. The process for preparing a non-woven fabric for sunshade curtains according to claim 1, wherein: The preparation process of the polyurethane coating comprises the following preparation steps: Preparation of coating mixture: Mixing diol, dibutyltin dilaurate, tetrahydrofuran, castor oil and an anti-ultraviolet additive at a temperature of 70° C. and a rotation speed of 300 r / min for 30 minutes, then mixing with diisocyanate and tetrahydrofuran, and reacting at 70-80° C. for 2-4 hours to obtain a coating prepolymer mixture; cooling the coating prepolymer mixture to 25° C., adding dibutyltin dilaurate and phenol for end-capping, and obtaining a coating mixture; Spraying: Cool the non-woven fabric after the web is shaped to 35°C, and then spray the coating mixture on the non-woven fabric after the web is shaped; Film formation: The non-woven fabric sprayed with the coating mixture is placed at a temperature of 60-80°C and an ambient humidity of 45%-65% for 3-5 hours to obtain a non-woven fabric for curtains with a polyurethane coating.

5. The process for preparing a non-woven fabric for sunshade curtains according to claim 1, characterized in that: Before the mixed fiber combing step, the PET fiber and the LPET fiber are surface pretreated with a surface treatment liquid, wherein the surface treatment liquid is a mixture of sulfuric acid, ferric chloride and water, and the sulfuric acid concentration in the surface treatment liquid is 14-20%.

6. A non-woven fabric for sunshade curtains, characterized in that: The non-woven fabric for sunshade curtains is prepared by the preparation process of any one of claims 1 to 5.

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