Preparation method of yellowing-resistant nylon particle composite material

Abstract

The preparation method of the yellowing-resistant nylon particle composite material comprises the following steps: S1, weighing 100 parts by weight of nylon, and adding the nylon into a reaction kettle; s2, adding 2, 2, 2-trifluoroethanol as a solvent into the reaction kettle, and stirring to form a uniform nylon dissolving solution; s3, conveying the nylon dissolving solution into a spray dryer through a peristaltic pump, and performing atomization, drying and powder collection under the protection of nitrogen; s4, placing the powder in a vacuum drying oven, and drying at 25 DEG C for 3 hours to obtain nylon powder; s5, mixing the nylon powder with the following raw materials in parts by weight: 1-2 parts of an ultraviolet light absorber, 1-2 parts of a hindered phenol antioxidant, 2-4 parts of adipic acid, 0.5-1.5 parts of sebacic acid, 0.1-0.5 part of dicumyl peroxide and 8-10 parts of silane coupling agent modified mica powder; and S6, carrying out melt blending on the mixture obtained in the step S5 in a twin-screw extruder to obtain the yellowing-resistant nylon particle composite material.

Description

A method for preparing a yellowing-resistant nylon particle composite material Technical Field

[0001] This invention relates to a method for preparing nylon particles. Background Technology

[0002] Traditional nylon particles face numerous challenges in the application of coated reflective films. First, nylon materials are sensitive to light and thermal oxidation, easily leading to yellowing and hindering their use in fields such as automotive displays. Second, nylon reflective films are easily scratched or lack sufficient mechanical strength when in contact with light guide plates, failing to meet the higher requirements of automotive displays for yellowing resistance and mechanical performance. Furthermore, while existing white plastic reflective films exhibit excellent reflectivity, they are prone to creases and scratches, making them unsuitable for practical applications. Summary of the Invention

[0003] To overcome the shortcomings of existing nylon materials, this invention provides a method for preparing a nylon particle composite material resistant to yellowing. The prepared nylon particle composite material is resistant to yellowing, not easily scratched, and has improved wear resistance and aging resistance.

[0004] The technical solution of this invention to solve its technical problem is: a method for preparing a nylon particle composite material resistant to yellowing, comprising the following steps: S1, weighing 100 parts of nylon by weight and adding it to a reaction vessel; S2, adding 2,2,2-trifluoroethanol as a solvent to the reaction vessel, controlling the solvent volume to be 1:1-1.5 (nylon mass to solvent volume ratio), and stirring to form a uniform nylon solution; S3, conveying the nylon solution to a spray dryer through a peristaltic pump, and performing atomization, drying, and powder collection under nitrogen protection; S4, [the following steps are described in the original text, but are not directly related to the technical solution: S1, weighing 100 parts of nylon by weight and adding it to a reaction vessel; S2, adding 2,2,2-trifluoroethanol as a solvent, controlling the solvent volume to be 1:1-1.5 (nylon mass to solvent volume ratio), and stirring to form a uniform nylon solution; S3, conveying the nylon solution to a spray dryer through a peristaltic pump, and performing atomization, drying, and powder collection under nitrogen protection; S4, [the following steps are described in the original text, but are not directly related to the technical solution: S1, adding 100 parts of nylon by weight and adding it to a reaction vessel; S2, adding 2,2,2-trifluoroethanol as a solvent, controlling the solvent volume to be 1:1-1.5 (nylon mass to solvent volume ratio); ... S3. The dried powder is placed in a vacuum drying oven and dried at 25°C for 3 hours to obtain nylon powder; S5. The nylon powder is mixed with the following raw materials in parts by weight: 1-2 parts of ultraviolet absorber, 1-2 parts of hindered phenolic antioxidant, 2-4 parts of adipic acid, 0.5-1.5 parts of sebacic acid, 0.1-0.5 parts of dicumyl peroxide, and 8-10 parts of mica powder modified with silane coupling agent; S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

[0005] Preferably, in step S3, the inlet temperature of the spray dryer is controlled at 115-135℃, the outlet temperature is controlled at 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0006] Preferably, in step S5, the ultraviolet absorber is ultraviolet absorber UV-328.

[0007] Preferably, in step S5, the hindered phenolic antioxidant is antioxidant 1010.

[0008] The beneficial effects of this invention are as follows: 1. By introducing ultraviolet absorbers into the nylon main chain, the free radical chain reaction pathway initiated by ultraviolet light is effectively blocked, significantly improving the material's resistance to yellowing. In particular, the ultraviolet absorber UV-328 is used, which has a high absorption rate in the 290-400nm wavelength range and good compatibility with the nylon matrix, preventing precipitation and solving the problem of yellowing of traditional nylon particles under light or thermal oxidation environments. 2. Hindered phenolic antioxidants are incorporated into the nylon matrix to form a three-dimensional uniformly distributed antioxidant network, achieving multi-level barrier against thermal oxidation and effectively solving the problem of insufficient wear resistance and aging resistance of existing nylon composite materials. 3. By controlling the ratio of adipic acid to sebacic acid and adjusting the length of the flexible segment of the molecular chain, combined with dicumyl peroxide to initiate controllable cross-linking, a "sea-island structure" is formed where hard crystalline regions and elastic amorphous regions interpenetrate, maintaining the elastic modulus in the range of 2.8-3.2 GPa. This structural design not only improves the mechanical strength of the material but also effectively solves the problem of easy scratching of existing nylon composite materials. 4. The layered structure of mica powder is arranged in parallel on the film surface, which not only improves the surface smoothness, but also reduces the coefficient of friction through the slip mechanism, effectively solving the problem that existing white plastic reflective films are prone to creases and scratches. Detailed Implementation

[0009] The present invention will be further described in detail below with reference to specific embodiments.

[0010] Example 1: A method for preparing a yellowing-resistant nylon particle composite material, comprising the following steps: S1, weighing 100 parts of nylon 12 by weight and adding it to a reaction vessel.

[0011] S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, and control the amount of solvent to be 1:1 in mass ratio of nylon to volume ratio of solvent. After stirring, a uniform nylon solution is formed.

[0012] S3. The nylon solution is delivered to the spray dryer via a peristaltic pump, where it is atomized, dried, and powdered under nitrogen protection.

[0013] The inlet temperature of the spray dryer is controlled between 115-135℃, the outlet temperature is controlled between 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0014] S4. Place the dried powder from step S3 into a vacuum drying oven and dry it at 25°C for 3 hours to obtain nylon powder.

[0015] S5. Mix the nylon powder with the following raw materials in parts by weight: UV absorber UV-328: 1.5 parts, antioxidant 1010: 1.5 parts, adipic acid: 3 parts, sebacic acid: 1 part, dicumyl peroxide: 0.2 parts, and mica powder modified with silane coupling agent: 9 parts. The use of silane coupling agent-modified mica powder is existing technology and will not be described further here.

[0016] S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

[0017] Example 2: A method for preparing a yellowing-resistant nylon particle composite material, comprising the following steps: S1, weighing 100 parts of nylon 12 by weight and adding it to a reaction vessel.

[0018] S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, and control the amount of solvent to be 1:1.5 of nylon mass to solvent volume. After stirring, a uniform nylon solution is formed.

[0019] S3. The nylon solution is delivered to the spray dryer via a peristaltic pump, where it is atomized, dried, and powdered under nitrogen protection.

[0020] The inlet temperature of the spray dryer is controlled between 115-135℃, the outlet temperature is controlled between 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0021] S4. Place the dried powder from step S3 into a vacuum drying oven and dry it at 25°C for 3 hours to obtain nylon powder.

[0022] S5. Mix the nylon powder with the following raw materials in the following weight proportions: UV absorber UV-328: 1 part, antioxidant 1010: 2 parts, adipic acid: 2 parts, sebacic acid: 0.5 parts, dicumyl peroxide: 0.1 parts, and mica powder modified with silane coupling agent: 8 parts. The use of silane coupling agent-modified mica powder is existing technology and will not be described further here.

[0023] S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

[0024] Example 3: A method for preparing a yellowing-resistant nylon particle composite material, comprising the following steps: S1, weighing 100 parts of nylon 12 by weight and adding it to a reaction vessel.

[0025] S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, and control the amount of solvent to be 1:1.1 of nylon mass to solvent volume. After stirring, a uniform nylon solution is formed.

[0026] S3. The nylon solution is delivered to the spray dryer via a peristaltic pump, where it is atomized, dried, and powdered under nitrogen protection.

[0027] The inlet temperature of the spray dryer is controlled between 115-135℃, the outlet temperature is controlled between 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0028] S4. Place the dried powder from step S3 into a vacuum drying oven and dry it at 25°C for 3 hours to obtain nylon powder.

[0029] S5. Mix the nylon powder with the following raw materials in parts by weight: UV absorber UV-328: 2 parts, antioxidant 1010: 1 part, adipic acid: 3.2 parts, sebacic acid: 1.5 parts, dicumyl peroxide: 0.25 parts, and mica powder modified with silane coupling agent: 10 parts. The use of silane coupling agent-modified mica powder is existing technology and will not be described further here.

[0030] S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

[0031] Example 4: A method for preparing a yellowing-resistant nylon particle composite material, comprising the following steps: S1, weighing 100 parts of nylon 12 by weight and adding it to a reaction vessel.

[0032] S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, and control the amount of solvent to be 1:1.4 of nylon mass to solvent volume. After stirring, a uniform nylon solution is formed.

[0033] S3. The nylon solution is delivered to the spray dryer via a peristaltic pump, where it is atomized, dried, and powdered under nitrogen protection.

[0034] The inlet temperature of the spray dryer is controlled between 115-135℃, the outlet temperature is controlled between 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0035] S4. Place the dried powder from step S3 into a vacuum drying oven and dry it at 25°C for 3 hours to obtain nylon powder.

[0036] S5. Mix the nylon powder with the following raw materials in parts by weight: UV absorber UV-328: 1.8 parts, antioxidant 1010: 1.3 parts, adipic acid: 4 parts, sebacic acid: 1.3 parts, dicumyl peroxide: 0.5 parts, and mica powder modified with silane coupling agent: 9.2 parts. The use of silane coupling agent-modified mica powder is existing technology and will not be described further here.

[0037] S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

[0038] Example 5: A method for preparing a yellowing-resistant nylon particle composite material, comprising the following steps: S1, weighing 100 parts of nylon 12 by weight and adding it to a reaction vessel.

[0039] S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, and control the amount of solvent to be 1:1.2 of nylon mass to solvent volume. After stirring, a uniform nylon solution is formed.

[0040] S3. The nylon solution is delivered to the spray dryer via a peristaltic pump, where it is atomized, dried, and powdered under nitrogen protection.

[0041] The inlet temperature of the spray dryer is controlled between 115-135℃, the outlet temperature is controlled between 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0042] S4. Place the dried powder from step S3 into a vacuum drying oven and dry it at 25°C for 3 hours to obtain nylon powder.

[0043] S5. Mix the nylon powder with the following raw materials in parts by weight: UV absorber UV-326: 1.6 parts, antioxidant 264: 1.7 parts, adipic acid: 3.5 parts, sebacic acid: 0.8 parts, dicumyl peroxide: 0.3 parts, and mica powder modified with a silane coupling agent: 9.5 parts. The use of silane coupling agent-modified mica powder is existing technology and will not be described further here.

[0044] S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

[0045] Example 6: A method for preparing a yellowing-resistant nylon particle composite material, comprising the following steps: S1, weighing 100 parts of nylon 12 by weight and adding it to a reaction vessel.

[0046] S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, and control the amount of solvent to be 1:1.3 of nylon mass to solvent volume. After stirring, a uniform nylon solution is formed.

[0047] S3. The nylon solution is delivered to the spray dryer via a peristaltic pump, where it is atomized, dried, and powdered under nitrogen protection.

[0048] The inlet temperature of the spray dryer is controlled between 115-135℃, the outlet temperature is controlled between 80-95℃, and the oxygen concentration is controlled below 1.2%.

[0049] S4. Place the dried powder from step S3 into a vacuum drying oven and dry it at 25°C for 3 hours to obtain nylon powder.

[0050] S5. Mix the nylon powder with the following raw materials in parts by weight: UV absorber UV-234: 1.2 parts, antioxidant 2246: 1.8 parts, adipic acid: 2.5 parts, sebacic acid: 1.2 parts, dicumyl peroxide: 0.4 parts, and mica powder modified with a silane coupling agent: 8.5 parts. The use of silane coupling agent-modified mica powder is existing technology and will not be described further here.

[0051] S6. The mixture obtained in step S5 is melt-blended in a twin-screw extruder at 230-250°C to obtain a yellowing-resistant nylon particle composite material.

Claims

1. A method for preparing a nylon particle composite material resistant to yellowing, characterized in that... The process includes the following steps: S1. Weigh 100 parts of nylon by weight and add them to a reaction vessel; S2. Add 2,2,2-trifluoroethanol as a solvent to the reaction vessel, controlling the solvent volume to be 1:1-1.5 (nylon mass to solvent volume ratio), and stir to form a homogeneous nylon solution; S3. Transfer the nylon solution to a spray dryer using a peristaltic pump, and perform atomization, drying, and powder collection under nitrogen protection; S4. Place the dried powder from step S3 in a vacuum drying oven... S5. Dry at 25℃ for 3 hours to obtain nylon powder; S6. Mix the nylon powder with the following raw materials in parts by weight: 1-2 parts of ultraviolet absorber, 1-2 parts of hindered phenolic antioxidant, 2-4 parts of adipic acid, 0.5-1.5 parts of sebacic acid, 0.1-0.5 parts of dicumyl peroxide, and 8-10 parts of mica powder modified with silane coupling agent; S7. Melt blend the mixture obtained in step S5 in a twin-screw extruder at 230-250℃ to obtain a yellowing-resistant nylon particle composite material.

2. The method for preparing the resistant nylon particle composite material as described in claim 1, characterized in that: In step S3, the inlet temperature of the spray dryer is controlled at 115-135℃, the outlet temperature is controlled at 80-95℃, and the oxygen concentration is controlled below 1.2%.

3. The method for preparing the resistant nylon particle composite material as described in claim 1, characterized in that: In step S5, the ultraviolet absorber is ultraviolet absorber UV-328.

4. The preparation method of the resistant nylon particle composite material as described in claim 1, characterized in that: In step S5, the hindered phenolic antioxidant is antioxidant 1010.