Biodegradable foaming master batch composition as well as preparation method and application thereof

Abstract

The invention discloses a biodegradable foaming master batch composition and a preparation method and application thereof.The biodegradable foaming master batch composition at least comprises first-stage foaming master batch and second-stage foaming master batch, the particle size range of the first-stage foaming master batch is 0.18-0.35 mm, and the particle size range of the second-stage foaming master batch is 0.7-0.9 mm; in the biodegradable foaming master batch composition, the ratio of the mass M1 of the primary foaming master batch to the mass M2 of the secondary foaming master batch is M1: M2 = (2.1-2.6): (3.2-4.8); wherein the first-stage foaming master batch and the second-stage foaming master batch are foaming master batches made of the same material. The foaming master batch composition is formed by using the foaming master batches with different particle sizes, so that the difference in foaming time is formed, and the condition of insufficient foaming can be avoided while core burning is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of foaming materials, in particular to a biodegradable foaming masterbatch composition and a preparation method and application thereof. Background Art

[0002] Since the objects made of foam materials are light in weight, people use foam materials to make some object models or toys. For some objects with regular shapes, the use of foam materials will not cause uneven foaming or heartburn. However, for objects with special structures, if existing foam materials are used for foaming, uneven foaming or heartburn often occurs. The reason is that in order to make the foaming masterbatch foam as fully as possible, the foaming time will be extended. However, the foaming material is a poor heat conductor. The extension of the foaming time will cause a large amount of heat accumulation inside the larger part, which will cause heartburn. If the foaming time is shortened to avoid heartburn, it will cause partial inadequate foaming, resulting in the collapse of the foamed particles after foaming, affecting the appearance of the product. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to provide a biodegradable foaming masterbatch composition and a preparation method and application thereof, wherein the foaming masterbatch composition is composed of foaming masterbatches of different particle sizes to form a difference in foaming time, thereby avoiding heartburn and insufficient foaming.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A biodegradable foaming masterbatch composition comprises at least a primary foaming masterbatch and a secondary foaming masterbatch, wherein the particle size of the primary foaming masterbatch is in the range of 0.18 to 0.35 mm, and the particle size of the secondary foaming masterbatch is in the range of 0.7 to 0.9 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch to the mass M2 of the secondary foaming masterbatch is M1:M2=(2.1 to 2.6):(3.2 to 4.8); wherein the primary foaming masterbatch and the secondary foaming masterbatch are made of the same material.

[0006] The above-mentioned biodegradable foaming masterbatch composition also includes a tertiary foaming masterbatch which is made of the same material as the primary foaming masterbatch and has a particle size range of 1.6 to 2.1 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch, the mass M2 of the secondary foaming masterbatch and the mass M3 of the tertiary foaming masterbatch is M1:M2:M3=(2.1 to 2.6):(3.2 to 4.8):(1.3 to 1.8).

[0007] In the above-mentioned biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch, the mass M2 of the secondary foaming masterbatch and the mass M3 of the tertiary foaming masterbatch is M1:M2:M3=(2.25-2.45):(3.6-4.5):(1.3-1.6).

[0008] The above-mentioned biodegradable foaming masterbatch composition also includes rod-shaped foaming masterbatch with the same material as the primary foaming masterbatch and a diameter of 0.1-0.13 mm and a length of 0.3-0.7 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch to the mass M4 of the rod-shaped foaming masterbatch is M1:M4=(2.25-2.45):(0.8-1).

[0009] In the above-mentioned biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch to the mass M4 of the rod-shaped foaming masterbatch is M1:M4=(2.3-2.4):(0.92-0.97).

[0010] The above-mentioned biodegradable foaming masterbatch composition, the rod-shaped foaming masterbatch includes short rod-shaped foaming masterbatch with a diameter of 0.1-0.13 mm and a length of 0.3-0.45 mm and long rod-shaped foaming masterbatch with a diameter of 0.1-0.13 mm and a length of 0.6-0.7 mm.

[0011] In the above-mentioned biodegradable foaming masterbatch composition, the ratio of the mass M5 of the short rod-shaped foaming masterbatch to the mass M6 of the long rod-shaped foaming masterbatch is M5:M6=(1-3):(2-5).

[0012] The preparation method of the above-mentioned biodegradable foaming masterbatch composition comprises the following steps:

[0013] S1) preparing materials: placing the foaming masterbatch in a storage environment at a temperature of -12°C to -5°C for cold storage for 2 to 6 hours, wherein the foaming masterbatch includes a primary foaming masterbatch and a secondary foaming masterbatch;

[0014] S2) pre-mixing: placing the foaming masterbatch after cold storage in a heat-insulating container and stirring and mixing for at least 30 minutes;

[0015] S3) Filling and mixing: injecting the foaming masterbatch pre-mixed in step S2) into the mold, and mixing the foaming masterbatch in the mold by vibration during the injection process.

[0016] In the above preparation method, in step S2), before placing the cold-stored foaming masterbatch into the heat-insulating container, the cold-stored foaming masterbatch is first dispersed and sieved in an environment of -12°C to -5°C; while stirring and mixing, cold air is circulated and blown into the heat-insulating container from the bottom of the heat-insulating container, and the cold air temperature is 0°C to 5°C.

[0017] The biodegradable foaming masterbatch composition is used to prepare a foamed body with a special structure.

[0018] The technical solution of the present invention achieves the following beneficial technical effects:

[0019] 1. Use smaller foaming masterbatch to fill the gap between larger foaming masterbatch. In the foaming process, the smaller foaming masterbatch can be used to quickly reach the same temperature inside and outside, so that the foam particles formed by the foaming of the smaller foaming masterbatch can quickly fill the gap between the larger foaming masterbatch. However, since the foaming masterbatch is a poor thermal conductor, the contact area between the smaller foaming masterbatch and the larger foaming masterbatch is smaller, and the heat transfer is slower, while the contact area between the larger foaming masterbatch is larger, and the heat transfer is relatively faster, which will cause the larger foaming masterbatch to foam earlier and the smaller foaming masterbatch to foam later. Using the smaller foaming masterbatch to fill the gap between the larger foaming masterbatch can shorten the foaming time while ensuring the foaming effect, avoid the occurrence of heartburn, and also avoid the collapse of the foam particles.

[0020] 2. Use smaller foaming masterbatch to fill the gaps between larger foaming masterbatch to reduce the gaps between the foaming masterbatch, which is beneficial to the heat transfer rate between the foaming masterbatch and helps to accelerate the heat dissipation inside the foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an electron microscope photograph of the foamed material made from the biodegradable foaming masterbatch composition of Example 2. DETAILED DESCRIPTION

[0022] Example 1

[0023] In this embodiment, the biodegradable foaming masterbatch composition includes a primary foaming masterbatch and a secondary foaming masterbatch, the particle size range of the primary foaming masterbatch is 0.18-0.35 mm, and the particle size range of the secondary foaming masterbatch is 0.7-0.9 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch to the mass M2 of the secondary foaming masterbatch is M1:M2=(2.1-2.6):(3.2-4.8), preferably, M1:M2=(2.35-2.45):(3.7-4.2); wherein the primary foaming masterbatch and the secondary foaming masterbatch are foaming masterbatch made of the same material.

[0024] Example 2

[0025] In this embodiment, the biodegradable foaming masterbatch composition includes a primary foaming masterbatch, a secondary foaming masterbatch and a tertiary foaming masterbatch, and the primary foaming masterbatch, the secondary foaming masterbatch and the tertiary foaming masterbatch are foaming masterbatch made of the same material. Among them, the relevant parameters of the primary foaming masterbatch and the secondary foaming masterbatch are the same as those of the primary foaming masterbatch and the secondary foaming masterbatch in Example 1, and the particle size range of the tertiary foaming masterbatch is 1.6 to 2.1 mm. In the biodegradable foaming masterbatch composition of the present embodiment, the ratio of the mass M1 of the primary foaming masterbatch, the mass M2 of the secondary foaming masterbatch and the mass M3 of the tertiary foaming masterbatch is M1:M2:M3=(2.1-2.6):(3.2-4.8):(1.3-1.8), preferably, M1:M2:M3=(2.25-2.45):(3.6-4.5):(1.3-1.6), more preferably, M1:M2:M3=(2.3-2.36):(3.9-4.2):(1.35-1.53).

[0026] Example 3

[0027] In this embodiment, the biodegradable foaming masterbatch composition includes a primary foaming masterbatch, a secondary foaming masterbatch and a rod-shaped foaming masterbatch, and the primary foaming masterbatch, the secondary foaming masterbatch and the rod-shaped foaming masterbatch are foaming masterbatch made of the same material. Among them, the relevant parameters of the primary foaming masterbatch and the secondary foaming masterbatch are the same as those of the primary foaming masterbatch and the secondary foaming masterbatch in Example 1, and the diameter of the rod-shaped foaming masterbatch is 0.1-0.13 mm and the length is 0.3-0.7 mm. In the biodegradable foaming masterbatch composition in this embodiment, the ratio of the mass M1 of the primary foaming masterbatch and the mass M4 of the rod-shaped foaming masterbatch is M1:M4=(2.25-2.45):(0.8-1), preferably, M1:M4=(2.3-2.4):(0.92-0.97).

[0028] In this embodiment, the rod-shaped foaming masterbatch includes short rod-shaped foaming masterbatch with a diameter of 0.1-0.13 mm and a length of 0.3-0.45 mm and long rod-shaped foaming masterbatch with a diameter of 0.1-0.13 mm and a length of 0.6-0.7 mm, wherein the ratio of the mass M5 of the short rod-shaped foaming masterbatch to the mass M6 of the long rod-shaped foaming masterbatch is M5:M6=(1-3):(2-5), and preferably, M5:M6=(1.5-2.6):(3.4-4.2).

[0029] The biodegradable foaming masterbatch compositions in Examples 1 to 3 are prepared by the following steps:

[0030] S1) preparing materials: placing the foaming masterbatch in a storage environment at a temperature of -12°C to -5°C for cold storage for 2 to 6 hours, preferably; wherein the primary foaming masterbatch, the secondary foaming masterbatch, the tertiary foaming masterbatch and the rod-shaped foaming masterbatch are all pre-made foaming masterbatch;

[0031] S2) premixing: placing the cold-stored foaming masterbatch into an insulated container for stirring and mixing, the stirring time is at least 30 minutes, the stirring time depends on the total amount of materials and the stirring speed, usually, the stirring speed is controlled at 30-120r / min; before placing the cold-stored foaming masterbatch into the insulated container, the cold-stored foaming masterbatch is first dispersed and sieved in an environment of -12°C to -5°C; during stirring and mixing, cold air is circulated into the insulated container from the bottom of the insulated container, and the temperature of the cold air is 0°C to 5°C;

[0032] S3) Filling and mixing: injecting the foaming masterbatch pre-mixed in step S2) into the mold, and mixing the foaming masterbatch in the mold by vibration during the injection process.

[0033] Freezing the foaming masterbatch by low-temperature storage is beneficial to improving the surface hardness of the foaming masterbatch and eliminating the static electricity on the foaming masterbatch due to friction. It can also reduce the possibility of static electricity generated by friction when mixing multiple foaming masterbatches, avoid the phenomenon of foaming masterbatches adhering to each other due to static electricity, and is beneficial to the full mixing of the foaming masterbatch, that is, it is beneficial for the foaming masterbatch with smaller particle size or smaller diameter to be filled into the gap between the foaming masterbatches with larger particle size.

[0034] When the pre-mixed foaming masterbatch is injected into the mold, the foaming masterbatch is mixed in the mold by vibration, so that the foaming masterbatch with a smaller particle size can be filled into the gap between the foaming masterbatch with a larger particle size as much as possible.

[0035] In the present invention, the foaming masterbatch is made of PBAT, a foaming agent, an antistatic agent, a flame retardant, a processing aid and other components, and the difference lies in the difference in shape and size.

[0036] Before foaming, the foaming masterbatch in the mold can be heated by passing hot air into the mold so that the temperature of the foaming masterbatch in the mold rises to room temperature. The temperature of the foaming masterbatch in the mold can also be slowly raised to room temperature by standing, and then heated to the foaming temperature for foaming and controlling the foaming time. When heating the foaming masterbatch in the mold, the mold can be vacuumed first and then hot air is passed through, and the operation is repeated 3 to 5 times, and the hot air flow directions of the two adjacent operations are opposite, and then heated by microwave heating and other methods. This method of vacuuming first and then passing hot air can not only heat the foaming masterbatch, but also make the temperature of the internal foaming masterbatch lower than that of the peripheral foaming masterbatch, which is conducive to the foaming rate of the internal foaming masterbatch being lower than that of the peripheral foaming masterbatch during foaming, so that the foaming masterbatch inside the foaming material that stops foaming by suspending heating or cooling will not foam for a long time due to heat accumulation, thereby avoiding heartburn.

[0037] Utilize the electron microscope photograph of the foamed material obtained in Example 2 as Figure 1 As shown by Figure 1 It can be seen that the foam particles formed by foaming the foaming masterbatch with a larger particle size are filled with foam particles formed by foaming the foaming masterbatch with a smaller particle size.

[0038] The biodegradable foaming masterbatch composition of the present invention can be used to prepare foams with special structures (such as foamed fixing components for electronic products with larger fixing volumes), and can also be used to prepare foams with conventional shapes, such as foam boards.

[0039] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the claims of this patent application.

Claims

1. A biodegradable foaming masterbatch composition, characterized in that: The invention comprises at least a primary foaming masterbatch and a secondary foaming masterbatch, wherein the particle size range of the primary foaming masterbatch is 0.18-0.35 mm, and the particle size range of the secondary foaming masterbatch is 0.7-0.9 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch to the mass M2 of the secondary foaming masterbatch is M1:M2=(2.1-2.6):(3.2-4.8); wherein the primary foaming masterbatch and the secondary foaming masterbatch are made of the same material.

2. The biodegradable foaming masterbatch composition according to claim 1, characterized in that: It also includes a tertiary foaming masterbatch made of the same material as the primary foaming masterbatch and with a particle size range of 1.6 to 2.1 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch, the mass M2 of the secondary foaming masterbatch and the mass M3 of the tertiary foaming masterbatch is M1:M2:M3=(2.1 to 2.6):(3.2 to 4.8):(1.3 to 1.8).

3. The biodegradable foaming masterbatch composition according to claim 2, characterized in that: The ratio of the mass M1 of the primary foaming masterbatch, the mass M2 of the secondary foaming masterbatch and the mass M3 of the tertiary foaming masterbatch is M1:M2:M3=(2.25-2.45):(3.6-4.5):(1.3-1.6).

4. The biodegradable foaming masterbatch composition according to claim 1, characterized in that: It also includes rod-shaped foaming masterbatch with the same material as the primary foaming masterbatch and a diameter of 0.1-0.13 mm and a length of 0.3-0.7 mm; in the biodegradable foaming masterbatch composition, the ratio of the mass M1 of the primary foaming masterbatch to the mass M4 of the rod-shaped foaming masterbatch is M1:M4=(2.25-2.45):(0.8-1).

5. The biodegradable foaming masterbatch composition according to claim 4, characterized in that: The ratio of the mass M1 of the primary foaming masterbatch to the mass M4 of the rod-shaped foaming masterbatch is M1:M4=(2.3-2.4):(0.92-0.97).

6. The biodegradable foaming masterbatch composition according to claim 4, characterized in that: The rod-shaped foaming masterbatch includes short rod-shaped foaming masterbatch with a diameter of 0.1-0.13 mm and a length of 0.3-0.45 mm and long rod-shaped foaming masterbatch with a diameter of 0.1-0.13 mm and a length of 0.6-0.7 mm.

7. The biodegradable foaming masterbatch composition according to claim 6, characterized in that: The ratio of the mass M5 of the short rod-shaped foaming masterbatch to the mass M6 of the long rod-shaped foaming masterbatch is M5:M6=(1-3):(2-5).

8. The method for preparing the biodegradable foaming masterbatch composition according to claim 1, characterized in that: The steps include: S1) preparing materials: placing the foaming masterbatch in a storage environment at a temperature of -12°C to -5°C for cold storage for 2 to 6 hours, wherein the foaming masterbatch includes a primary foaming masterbatch and a secondary foaming masterbatch; S2) pre-mixing: placing the foaming masterbatch after cold storage in a heat-insulating container and stirring and mixing for at least 30 minutes; S3) Filling and mixing: injecting the foaming masterbatch premixed in step S2) into the mold, and mixing the foaming masterbatch in the mold by vibration during the injection process.

9. The preparation method according to claim 8, characterized in that: In step S2), before placing the cold-stored foaming masterbatch into the heat-insulating container, the cold-stored foaming masterbatch is first dispersed and sieved in an environment of -12°C to -5°C; during stirring and mixing, cold air is circulated and blown into the heat-insulating container from the bottom of the heat-insulating container, and the cold air temperature is 0°C to 5°C.

10. The use of the biodegradable foaming masterbatch composition according to claim 1, characterized in that: Used to prepare special-shaped structural foams.

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