A high-strength glass fiber modified polypropylene material building template and a preparation method thereof

Abstract

The application relates to the field of novel template materials, and particularly discloses a high-strength glass fiber modified polypropylene material building template and a preparation method thereof. The high-strength glass fiber modified polypropylene material building template is formed by injection molding of modified polypropylene master batches, the modified polypropylene master batches comprise the following raw materials in parts by weight: polypropylene master batches 50-80 parts, reinforcing agent 10-20 parts, composite flow improver 3-6 parts, and compatilizer 4-8 parts, wherein the reinforcing agent is glass fiber; and the preparation method comprises the following steps: firstly, mixing the raw materials, and then obtaining master batches through extrusion granulation; and then injection molding the master batches into the building template. The high-strength glass fiber modified polypropylene material building template has the advantages of high building template size stability.

Description

Technical Field

[0001] This application relates to the field of novel template materials, and more specifically, it relates to a high-strength glass fiber modified polypropylene building template and its preparation method. Background Technology

[0002] Plastic formwork has undergone decades of development since its inception, with an increasing variety of types and specifications available on the market. It has been widely used in the construction industry of industrialized countries with good results. Currently, plastic formwork is extensively used in building and bridge engineering projects in my country.

[0003] Commonly used plastic formwork in China includes ribbed plastic formwork and hollow plastic formwork.

[0004] Ribbed formwork is a type of modular formwork composed of plastic panels and longitudinal, transverse, and diagonal ribs. Also known as "prefabricated formwork," it is typically designed and manufactured using a modular system. During construction, this type of formwork is interconnected via connectors, eliminating the need for on-site cutting and generating no construction waste.

[0005] Another type of hollow plastic formwork was the earliest star product in the "plastic replacing wood" trend. Unlike solid plastic formwork, which is easily bent by heat, hollow formwork allows air to flow through the hollow layers, preventing heat transfer from one side of the board to the other. This effectively reduces deformation caused by the heat of concrete hydration or changes in ambient temperature.

[0006] Currently, common plastic formwork on the market is mainly made from various resins such as polyvinyl chloride, polypropylene, and polycarbonate. Among them, products made from pure polypropylene resin have a large molding shrinkage rate and low rigidity, which does not meet the rigidity requirements of building formwork. Summary of the Invention

[0007] To improve the strength of building formwork, this application provides a high-strength glass fiber modified polypropylene building formwork and its preparation method.

[0008] In a first aspect, this application provides a high-strength glass fiber modified polypropylene material building formwork, which adopts the following technical solution:

[0009] A high-strength glass fiber modified polypropylene building template includes 50-80 parts of polypropylene masterbatch, 10-20 parts of reinforcing agent, 3-6 parts of composite flow promoter, and 4-8 parts of compatibilizer, wherein the reinforcing agent is glass fiber.

[0010] By adopting the above technical solution, glass fiber is first used as a reinforcing agent to strengthen polypropylene, thereby improving the tensile strength and impact strength of polypropylene. At the same time, a compatibilizer is used to improve the interfacial shear strength between polypropylene and glass fiber, thereby improving the dimensional stability of the template. Furthermore, a composite flow promoter improves the fluidity of the polypropylene and glass fiber mixture, enabling the polypropylene and glass fiber mixture to be processed stably and improving dimensional stability.

[0011] Preferably, the glass fiber has a length of 3 to 6 mm.

[0012] By adopting the above technical solution, using glass fiber as a reinforcing agent and limiting the length of the glass fiber, the glass fiber can be dispersed in polypropylene. Under the action of the compatibilizer, a large amount of polypropylene resin is attached to the glass fiber. The good compatibility between the glass fiber and polypropylene can better transfer the external impact stress, thereby improving the tensile strength and impact resistance of polypropylene.

[0013] Preferably, the composite flow promoter comprises a peroxide, a binder, and a dilution stabilizer, wherein the weight ratio of the peroxide, binder, and dilution stabilizer is 4:7:4.

[0014] By adopting the above technical solution, the peroxide is diluted and protected by the diluent stabilizer using a binder as an intermediate substance, making the resulting mixture less prone to decomposition. This prevents the peroxide from decomposing and losing its function in the early stages of material melting. During the melt flow process, the peroxide causes the polypropylene molecular chains to break, reducing the relative molecular mass of the polypropylene molecules and thus improving fluidity. This facilitates the flow of polypropylene melt mixed with glass fiber and its injection molding into the corresponding mold. The improved melt fluidity of polypropylene resin allows it to better adhere to the glass fiber, further enhancing their compatibility and improving the impact resistance and other properties of the modified polypropylene.

[0015] Preferably, the peroxide is di-tert-butyl peroxide.

[0016] By adopting the above technical solution, when polypropylene forms a melt, the peroxide is simultaneously decomposed to generate free radicals that attack the polypropylene chains, thereby reducing the relative molecular mass of the polypropylene molecules. This promotes the flow of the mixed melt, making it easier to flow and effectively reducing the occurrence of fiber floating, thus resulting in better performance of the formed template.

[0017] Preferably, the binder is ethylene glycol.

[0018] By adopting the above technical solution, using ethylene glycol as a binder, the diluent stabilizer is first dissolved and then mixed with di-tert-butyl peroxide, thereby achieving dilution and protection of di-tert-butyl peroxide. Both ethylene glycol and the diluent stabilizer play a protective role for di-tert-butyl peroxide, reducing the loss of di-tert-butyl peroxide during the initial melting process of polypropylene.

[0019] Preferably, the diluent stabilizer is pentaerythritol distearate.

[0020] By adopting the above technical solution, pentaerythritol distearate and di-tert-butyl peroxide are connected by a linker, combining the liquid form of di-tert-butyl peroxide and the powder form of pentaerythritol distearate. This allows pentaerythritol distearate to protect the di-tert-butyl peroxide, thereby reducing the decomposition of di-tert-butyl peroxide in the early stage of melting, which is beneficial to the molecular chain decomposition of polypropylene melt and improves melt fluidity.

[0021] Preferably, the composite flow promoter is prepared by the following steps: first, the binder and the diluent stabilizer are mixed and stirred evenly, and after the diluent stabilizer is dissolved in the binder, the peroxide is added and stirred evenly to obtain the composite flow promoter.

[0022] By adopting the above technical solution, the diluent stabilizer and the peroxide are connected by a linker, thereby enabling the diluent stabilizer to protect the peroxide, reducing the decomposition of the peroxide in the early stage of melting, which is beneficial to the molecular chain decomposition of polypropylene melt and improves melt fluidity.

[0023] Secondly, this application provides a method for preparing high-strength glass fiber modified polypropylene building templates, employing the following technical solution:

[0024] A method for preparing a high-strength glass fiber modified polypropylene building template includes the following steps: first, mixing the raw materials, extruding and granulating them to obtain masterbatch, and then injection molding the masterbatch into a building template.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. Because this application uses glass fiber as a reinforcing agent to strengthen polypropylene, the tensile strength and impact strength of polypropylene are improved. At the same time, the compatibilizer is used to improve the interfacial shear strength between polypropylene and glass fiber, thereby improving the dimensional stability of the template.

[0027] 2. In this application, when polypropylene forms a melt, the peroxide is simultaneously decomposed to generate free radicals that attack the polypropylene chains, thereby reducing the relative molecular mass of the polypropylene molecules. This promotes the flow of the mixed melt, making it easier to flow and effectively reducing the occurrence of fiber floating, thus resulting in better performance of the formed template.

[0028] 3. In this application, pentaerythritol distearate and di-tert-butyl peroxide are linked by a binder, which combines the liquid form of di-tert-butyl peroxide and the powder form of pentaerythritol distearate. This allows pentaerythritol distearate to protect the di-tert-butyl peroxide, thereby reducing the decomposition of di-tert-butyl peroxide in the early stage of melting, which is beneficial to the molecular chain decomposition of polypropylene melt and improves melt fluidity. Attached Figure Description

[0029] Figure 1 This is a partial structural diagram of Example 1, mainly used to display the modules;

[0030] Figure 2 This is a partial structural diagram of Embodiment 1, mainly showing the support plate from another angle;

[0031] Figure 3 This is a partial structural diagram of Embodiment 1, mainly used to demonstrate the movable handle;

[0032] Figure 4 This is a partial structural diagram of Embodiment 1, mainly showing the movable handle from another angle.

[0033] Explanation of reference numerals in the attached diagram: 1. Plate; 2. Movable handle; 3. Through hole. Detailed Implementation

[0034] The compatibilizer used in this application is maleic anhydride-grafted POE, which is commercially available. The glass fiber diameter in this application is 20 μm. All raw materials used in this application are commercially available.

[0035] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example

[0037] Example 1

[0038] This embodiment discloses a building template, combined with Figure 1-4 It includes a plate 1 and a movable handle 2. The plate 1 is a cuboid plate. The side of the plate 1 has a through hole 3. When two adjacent plates 1 come into contact, the through holes 3 on the two adjacent plates 1 are aligned. The movable handle 2 passes through the through hole 3 to connect the two adjacent plates 1.

[0039] Example 2

[0040] This embodiment discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0041] S1. Dissolve 4 kg of pentaerythritol distearate in 7 kg of ethylene glycol by stirring and mixing, and then add 4 kg of di-tert-butyl peroxide by stirring and mixing to obtain a composite flow promoter.

[0042] S2. Place 50 kg of polypropylene masterbatch, 4 kg of compatibilizer, 10 kg of glass fiber and 3 kg of composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300 r / min for 30 minutes. The length of the glass fiber is 3 mm.

[0043] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0044] Example 3

[0045] This embodiment discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0046] S1. Dissolve 4 kg of pentaerythritol distearate in 7 kg of ethylene glycol by stirring and mixing, and then add 4 kg of di-tert-butyl peroxide by stirring and mixing to obtain a composite flow promoter.

[0047] S2. Place 65kg of polypropylene masterbatch, 6kg of compatibilizer, 15kg of glass fiber and 4.5kg of the composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300r / min for 30 minutes. The length of the glass fiber is 3mm.

[0048] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0049] Example 4

[0050] This embodiment discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0051] S1. Dissolve 4 kg of pentaerythritol distearate in 7 kg of ethylene glycol by stirring and mixing, and then add 4 kg of di-tert-butyl peroxide by stirring and mixing to obtain a composite flow promoter.

[0052] S2. Place 80 kg of polypropylene masterbatch, 8 kg of compatibilizer, 20 kg of glass fiber and 6 kg of composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300 r / min for 30 minutes. The length of the glass fiber is 3 mm.

[0053] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0054] Example 5

[0055] This embodiment discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0056] S1. Dissolve 4 kg of pentaerythritol distearate in 7 kg of ethylene glycol by stirring and mixing, and then add 4 kg of di-tert-butyl peroxide by stirring and mixing to obtain a composite flow promoter.

[0057] S2. Place 65 kg of polypropylene masterbatch, 6 kg of compatibilizer, 15 kg of glass fiber and 4.5 kg of the composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300 r / min for 30 minutes. The glass fiber length is 4.5 mm.

[0058] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0059] Example 6

[0060] This embodiment discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0061] S1. Dissolve 4 kg of pentaerythritol distearate in 7 kg of ethylene glycol by stirring and mixing, and then add 4 kg of di-tert-butyl peroxide by stirring and mixing to obtain a composite flow promoter.

[0062] S2. Place 65kg of polypropylene masterbatch, 6kg of compatibilizer, 15kg of glass fiber and 4.5kg of the composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300r / min for 30 minutes. The length of the glass fiber is 6mm.

[0063] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0064] Example 7

[0065] This embodiment discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0066] S1. Dissolve 4 kg of pentaerythritol distearate in 7 kg of ethanol by stirring and mixing, and then add 4 kg of di-tert-butyl peroxide by stirring and mixing to obtain a composite flow promoter.

[0067] S2. Place 65kg of polypropylene masterbatch, 6kg of compatibilizer, 15kg of glass fiber and 4.5kg of the composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300r / min for 30 minutes. The length of the glass fiber is 6mm.

[0068] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0069] Comparative Example

[0070] Comparative Example 1

[0071] This comparative example discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0072] S1. A composite flow promoter was prepared by mixing 11 kg of pentaerythritol distearate with 4 kg of di-tert-butyl peroxide.

[0073] S2. Place 65kg of polypropylene masterbatch, 6kg of compatibilizer, 15kg of glass fiber and 4.5kg of the composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300r / min for 30 minutes. The length of the glass fiber is 6mm.

[0074] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0075] Comparative Example 2

[0076] This comparative example discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0077] S1. A composite flow promoter was prepared by mixing 11 kg of ethylene glycol with 4 kg of di-tert-butyl peroxide.

[0078] S2. Place 65kg of polypropylene masterbatch, 6kg of compatibilizer, 15kg of glass fiber and 4.5kg of the composite flow promoter prepared in S1 into a high-speed mixer and mix at a high speed of 300r / min for 30 minutes. The length of the glass fiber is 6mm.

[0079] S3. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0080] Comparative Example 3

[0081] This comparative example discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0082] S1. Place 65kg of polypropylene masterbatch, 6kg of compatibilizer, 15kg of glass fiber and 4.5kg of di-tert-butyl peroxide in a high-speed mixer and mix at a high speed of 300r / min for 30 minutes. The glass fiber length is 6mm.

[0083] S2. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450r / min and the feed speed to 45r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0084] Comparative Example 4

[0085] This comparative example discloses a glass fiber modified polypropylene material, which is prepared by the following steps:

[0086] S1. Place 69.5 kg of polypropylene masterbatch, 6 kg of compatibilizer and 15 kg of glass fiber in a high-speed mixer and mix at a high speed of 300 r / min for 30 minutes. The glass fiber length is 6 mm.

[0087] S2. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450r / min and the feed speed to 45r / min as needed to obtain glass fiber modified polypropylene masterbatch.

[0088] Comparative Example 5

[0089] This comparative example discloses a modified polypropylene material, which is prepared by the following steps:

[0090] S1. Place 84.5 kg of polypropylene masterbatch and 6 kg of compatibilizer in a high-speed mixer and mix at a high speed of 300 r / min for 30 minutes. The glass fiber length is 6 mm.

[0091] S2. Then, the mixture is added to a twin-screw extruder for granulation. The temperatures of each section from the feed port to the die of the twin-screw extruder are 200℃, 215℃, 220℃, 230℃, 230℃, 230℃, 220℃, and 210℃, respectively. During the granulation process, the screw speed is adjusted to 450 r / min and the feed speed to 45 r / min as needed to obtain modified polypropylene masterbatch.

[0092] Performance testing

[0093] The modified polypropylene masterbatch obtained in the above embodiments can be used for injection molding of building templates.

[0094] The glass fiber modified polypropylene masterbatches obtained in the examples and comparative examples were injection molded into standard samples for performance testing. The specific test items are as follows.

[0095] Tensile strength: GB / T 1040.2-2022 Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics, specimen type 1A, tensile speed 50 mm / min.

[0096] Notched impact strength: GB / T1043.1-2008 Determination of impact properties of simply supported plastic beams - Part 1: Non-instrumental impact testing, tested according to type 1 specimen.

[0097] Each embodiment or comparative example was tested three times, and the average value was taken.

[0098] Table 1 Performance Test Data

[0099]

[0100]

[0101] As can be seen from Examples 3, 5, and 6 and Table 1, using glass fiber as a reinforcing agent and limiting the length of the glass fiber allows the glass fiber to be dispersed in polypropylene. Under the action of the compatibilizer, a large amount of polypropylene resin adheres to the glass fiber. The good compatibility between the glass fiber and polypropylene can effectively transfer external impact stress, thereby improving the tensile strength of polypropylene.

[0102] As can be seen from Examples 6 and 7 and Table 1, compared with using ethanol as a binder, using ethylene glycol as an intermediate substance can play a better role. The main function of ethylene glycol is that it dilutes and protects di-tert-butyl peroxide by pentaerythritol distearate, making the resulting mixture less prone to decomposition. This prevents di-tert-butyl peroxide from decomposing and losing its function in the early stage of material melting. During the melt flow process, di-tert-butyl peroxide causes the polypropylene molecular chains to break, reducing the relative molecular mass of polypropylene molecules and thus improving fluidity. This facilitates the flow of polypropylene melt mixed with glass fiber and its injection molding into the corresponding mold. The improved melt fluidity of polypropylene resin allows it to adhere better to the glass fiber, further improving their compatibility and enhancing the impact resistance and other properties of the modified polypropylene.

[0103] As can be seen from Example 6 and Comparative Example 4, and Table 1, firstly, glass fiber is used as a reinforcing agent to strengthen polypropylene, thereby improving the tensile strength and impact strength of polypropylene. At the same time, a compatibilizer is used to improve the interfacial shear strength between polypropylene and glass fiber, thereby improving the dimensional stability of the template. Furthermore, a composite flow promoter improves the flowability of the polypropylene and glass fiber mixture, enabling the polypropylene and glass fiber mixture to be processed stably and improving dimensional stability.

[0104] Based on Comparative Examples 3 and 4 and Table 1, it can be seen that the composite flow promoter improves the flowability of the polypropylene and glass fiber mixture, enabling the polypropylene and glass fiber mixture to be processed stably and improving dimensional stability.

[0105] As can be seen from Example 6 and Comparative Examples 1-3, and Table 1, ethylene glycol as an intermediate substance can play a better role. Its main function is that ethylene glycol dilutes and protects di-tert-butyl peroxide by pentaerythritol distearate, making the resulting mixture less prone to decomposition. This prevents di-tert-butyl peroxide from decomposing and losing its function in the early stage of material melting. During the melt flow process, di-tert-butyl peroxide causes the polypropylene molecular chains to break, reducing the relative molecular mass of polypropylene molecules and thus improving fluidity. This facilitates the flow of polypropylene melt mixed with glass fiber and its injection molding into the corresponding mold. The improved melt fluidity of polypropylene resin allows it to adhere better to the glass fiber, further improving their compatibility and enhancing the impact resistance and other properties of the modified polypropylene.

[0106] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-strength glass fiber modified polypropylene building formwork, characterized in that, It is injection molded from modified polypropylene masterbatch, which includes the following raw materials in parts by weight: 50-80 parts polypropylene masterbatch, 10-20 parts reinforcing agent, 3-6 parts composite flow promoter, and 4-8 parts compatibilizer, wherein the reinforcing agent is glass fiber. The composite flow promoter comprises a peroxide, a binder, and a dilution stabilizer, wherein the weight ratio of the peroxide, binder, and dilution stabilizer is 4:7:4; the peroxide is di-tert-butyl peroxide; the binder is ethylene glycol; and the dilution stabilizer is pentaerythritol distearate. The composite flow promoter is prepared by the following steps: first, the binder and the diluent stabilizer are mixed and stirred evenly, and after the diluent stabilizer is dissolved in the binder, the peroxide is added and stirred evenly to obtain the composite flow promoter.

2. The high-strength glass fiber modified polypropylene building formwork according to claim 1, characterized in that, The glass fiber has a length of 3 to 6 mm.

3. The method for preparing high-strength glass fiber modified polypropylene building templates according to claim 1 or 2, characterized in that, Includes the following steps: First, the raw materials are mixed and then extruded and granulated to obtain masterbatch. Then, the masterbatch is injection molded into building templates.

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