High-performance smooth master batch based on TPU powder as carrier and with neutral PH and preparation method of high-performance smooth master batch

Abstract

The invention discloses a high-performance smooth master batch based on TPU (thermoplastic polyurethane) powder as a carrier and with a slightly neutral PH (potential of hydrogen) and a preparation method of the high-performance smooth master batch. The master batch is prepared from components in parts by mass as follows: 40-60 parts of thermoplastic polyurethane powder, 30-50 parts of inorganic powder, 2-10 parts of aluminum hypophosphite, 5-10 parts of a slipping agent and 0.5-1 part of an antioxidant. In the forming process of the master batch, the initial pH value of a system is adjusted by aluminum hypophosphite, a stable pH value environment is continuously provided in the subsequent hot working process, a neutral pH processing environment is constructed, the phenomena of master batch agglomeration, uneven dispersion and the like are reduced, and the yellowing resistance, aging resistance and other properties of a film layer can be improved when the master batch participates in processing other materials (such as the film layer) subsequently.

Description

Technical Field

[0001] This invention relates to the field of materials technology, specifically to a high-performance slip masterbatch based on TPU powder as a carrier and with a slightly neutral pH, and its preparation method. Background Technology

[0002] In the extrusion, blown film, and injection molding processes of plastics and elastomers, adding slip masterbatch can effectively reduce the coefficient of friction between materials, improve the surface smoothness, release properties, and gloss of the product, and prevent film adhesion. Typically, slip agents need to be melt-blended with a resin carrier (TPU) to form a high-concentration masterbatch to ensure uniform dispersion in the final product. Traditional TPU granules have poor compatibility with inorganic powders, easily leading to uneven masterbatch dispersion and affecting product properties such as resistance to yellowing and aging.

[0003] Meanwhile, many slip masterbatches contain a large amount of inorganic powder, which is alkaline, resulting in a high pH value in the system. This accelerates the hydrolysis and aging of the slip masterbatch, leading to yellowing and performance degradation of the finished film products. Summary of the Invention

[0004] To address at least one of the aforementioned technical deficiencies, the present invention provides the following technical solution:

[0005] This application discloses a high-performance slip masterbatch based on TPU powder as a carrier and with a slightly neutral pH. By weight, it comprises the following components: 40-60 parts of thermoplastic polyurethane powder, 30-50 parts of inorganic powder, 2-10 parts of aluminum hypophosphite, 5-10 parts of slip agent, and 0.5-1 part of antioxidant.

[0006] In this scheme, aluminum hypophosphite is used to adjust the pH value. During the masterbatch forming process, the initial pH value of the system is adjusted with aluminum hypophosphite, and a stable pH environment is continuously provided during the subsequent thermal processing. This creates a near-neutral pH processing environment, reducing phenomena such as masterbatch agglomeration and uneven dispersion. When used in the subsequent processing of other materials (such as film layers), it can improve the yellowing resistance and aging resistance of the film layer.

[0007] Furthermore, the inorganic powder is silica powder, the slip agent is oleic acid amide, and the antioxidant is type 1010 antioxidant.

[0008] Furthermore, the particle size of the thermoplastic polyurethane powder is 50-80 μm.

[0009] This application discloses a method for preparing the above-mentioned masterbatch, including the following steps: First, mix thermoplastic polyurethane powder, inorganic powder, aluminum hypophosphite, slip agent, and antioxidant evenly in a certain proportion; Second, the materials mixed in the first step are extruded and granulated to obtain smooth masterbatch.

[0010] Furthermore, the thermoplastic polyurethane powder is pre-dried and then mixed with inorganic powder, aluminum hypophosphite, slip agent, and antioxidant after cooling to room temperature.

[0011] Furthermore, the screw extruder parameters for the second extrusion step are: temperature 180-200℃, screw speed 180-250r / min. This scheme is based on thermoplastic polyurethane powder molding, and the extrusion temperature is about 10℃ lower than that of thermoplastic polyurethane granules.

[0012] Furthermore, the strips extruded in the second step are cooled and then cut into granules, which are called smooth masterbatches.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses aluminum hypophosphite, a traditional flame retardant, to adjust the pH value and create a near-neutral processing environment. The resulting masterbatch has advantages such as being less prone to agglomeration, having uniform component dispersion, and exhibiting excellent performance. When used in the processing of materials such as films, it helps to improve the film's resistance to yellowing, aging, low irritation, and high safety. Detailed Implementation

[0014] The present invention will be further described below with reference to specific embodiments.

[0015] Thermoplastic polyurethane powder, particle size 50-80μm, density 1.22g / cm³ 3 The active ingredient content is 100%, and the hardness is 70A. The thermoplastic polyurethane powder is dried at 100℃ for 4 hours beforehand and then cooled to room temperature for later use.

[0016] Silica powder, 3000 mesh.

[0017] Example 1 A method for preparing a high-performance slip masterbatch based on TPU powder as a carrier and with a neutral pH includes the following steps: First, mix thermoplastic polyurethane powder, inorganic powder (silica powder), aluminum hypophosphite, slip agent (oleamide), and antioxidant (antioxidant 1010) evenly according to the proportions shown in Table 1.

[0018] Second, add the mixed materials from the first step into a twin-screw extruder and extrude them into strips. The temperature settings of the twin-screw extruder are as follows: 180℃, 185℃, 190℃, 195℃, and the screw speed is 200r / min.

[0019] The strips extruded by the screw are placed in a water tank for cooling, and then cut into granules by a pelletizer. The resulting granules are smooth masterbatches with virtually no agglomeration.

[0020] Example 2 The difference from Example 1 is that the composition of the masterbatch is different, see Table 1.

[0021] Example 3 The difference from Example 1 is that the composition of the masterbatch is different, see Table 1.

[0022] Comparative Example 1 The difference from Example 1 is that the composition of the masterbatch is different, as shown in Table 1. The formed masterbatch exhibits more agglomeration.

[0023] Comparative Example 2 The difference from Example 1 is that the composition of the masterbatch is different, as shown in Table 1. The formed masterbatch exhibits more agglomeration.

[0024] Table 1

[0025] The performance of the masterbatch prepared above was tested as follows: Table 2

[0026] It can be seen that the pH value of the masterbatch without aluminum hypophosphite is significantly higher than that of the masterbatch prepared in each example.

[0027] The masterbatch prepared above was added to the same TPU particles at an addition ratio of 10% (by weight), stirred in a mixer for 6 minutes, and then thoroughly dried in a dehumidifying dryer. The film was then processed into a film with a thickness of 0.02 mm and a width of 30 cm on a blown film machine at a plasticizing temperature of 200°C and a rotation speed of 150 r / min. The film was left to cure for 3 days, and the performance of the film was tested as follows.

[0028] Table 3

[0029] pH determination of masterbatch and film: Take 5g of masterbatch particles or 5g of film, grind them into fine powder, add 50ml of deionized water, boil for 10 minutes, cool to room temperature, and determine the pH value of the suspension.

[0030] Calculation of sum of squared deviations: Tensile strength and elongation at break determination: The tensile strength and elongation at break of the film were determined according to ASTM D412 standard.

[0031] Determination of dispersion on the thin film surface: Microscopic observation over 1m 2 The number of crystal points larger than 100μm on the thin film surface is as follows: less than 5 is excellent, 5-20 is good, and more than 20 is unacceptable.

[0032] Determination of yellow index: The yellow index of the film is tested according to ASTM E313-15 standard.

[0033] As can be seen from Table 3, the films prepared with the masterbatch of the present invention exhibit excellent surface dispersion and superior yellow index. The yellow index indicates that the films prepared with the masterbatch have good resistance to yellowing, anti-aging, and processing stability. At the same time, the films prepared with the masterbatch of the present invention also exhibit excellent performance in mechanical properties such as tensile strength and elongation at break.

[0034] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-performance slip masterbatch based on TPU powder as a carrier and with a slightly neutral pH, characterized in that, By weight, it comprises the following components: 40-60 parts thermoplastic polyurethane powder, 30-50 parts inorganic powder, 2-10 parts aluminum hypophosphite, 5-10 parts slip agent, and 0.5-1 part antioxidant.

2. The high-performance slip masterbatch based on TPU powder as a carrier and with a slightly neutral pH as described in claim 1, characterized in that: The inorganic powder is silica powder, the slip agent is oleic acid amide, and the antioxidant is type 1010 antioxidant.

3. The high-performance slip masterbatch based on TPU powder as a carrier and with a slightly neutral pH as described in claim 1, characterized in that: The particle size of the thermoplastic polyurethane powder is 50-80 μm.

4. The method for preparing the masterbatch according to any one of claims 1-3, characterized in that: Includes the following steps: First, mix thermoplastic polyurethane powder, inorganic powder, aluminum hypophosphite, slip agent, and antioxidant evenly in a certain proportion; Second, the materials mixed in the first step are extruded and granulated to obtain smooth masterbatch.

5. The preparation method according to claim 4, characterized in that: Thermoplastic polyurethane powder is pre-dried and then mixed with inorganic powder, aluminum hypophosphite, slip agent, and antioxidant after cooling to room temperature.

6. The preparation method according to claim 4, characterized in that: The screw extruder parameters for the second extrusion step are: temperature 180-200℃, screw speed 180-250r / min.

7. The preparation method according to claim 4, characterized in that: The extruded strips from the second step are cooled and then cut into granules, which are called smooth masterbatches.

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