Foaming low-dielectric low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material

Abstract

The invention discloses a foamed low-dielectric low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material, and relates to the field of long glass fiber reinforced polypropylene composite materials and preparation thereof, the material is prepared from the following components by mass: 20-60 parts of polypropylene resin; 20 to 60 parts of continuous glass fiber; 15 to 20 parts of homopolymerized PP (polypropylene); 5 to 12 parts of hollow glass beads; 3 to 7 parts of azodicarbonamide; 6 to 12 parts of mesoporous silica; 3 to 6 parts of graphene aerogel; 0.5 to 1 part of fluoride; 0.1 to 1.5 parts of a compatilizer; 0.1 to 2 parts of an antioxidant; and 1-2 parts of a lubricant. According to the invention, through combination of multiple components, introduction of gas micropores to reduce the effective dielectric constant of the material and introduction of the low-dielectric filler, the urgent demands of the fields of high-frequency communication, millimeter wave radar and the like on low-dielectric-constant and low-dielectric-loss materials are met.

Description

Technical Field

[0001] The present invention relates to the field of long glass fiber reinforced polypropylene composite materials and preparation thereof, and in particular to a foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material and a preparation method thereof. Background Art

[0002] Polypropylene (PP) is a common thermoplastic material with advantages such as abundant raw material sources, low price, easy processing and molding, and excellent comprehensive product performance, such as low density, good mechanical properties, environmental protection and recyclability, and high cost performance. Therefore, it is widely used in many fields such as automobiles, home appliances, construction, medical care, packaging, aerospace and defense, electrical and electronics, etc.

[0003] However, as the application areas expand, performance requirements are increasing: the performance requirements of polypropylene in different application areas are gradually increasing. Modification research has become a hot topic, and common modification methods include chemical modification, blending modification, and filling modification. For example, glass fiber modification can improve the creep properties of polypropylene; the addition of specific additives can be used to improve its aging resistance; organically modified sepiolite is combined with polypropylene to make the composite material combine the characteristics of both, expanding its application areas and functions; and research is being conducted on the combination of non-halogen flame retardants, such as intumescent flame retardants, with polypropylene to improve the flame retardancy of polypropylene composites while also taking into account mechanical properties.

[0004] Solving the urgent demand for low dielectric constant and low dielectric loss materials in fields such as high-frequency communications and millimeter-wave radar has become one of the technical challenges in this field. Summary of the Invention

[0005] In response to the defects in the above-mentioned prior art, the present invention discloses a foamed low-dielectric, low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material. The present invention solves the urgent demand for low-dielectric-constant, low-dielectric-loss materials in fields such as high-frequency communications and millimeter-wave radar by combining multiple components, introducing gas micropores to reduce the equivalent dielectric constant of the material, and introducing low-dielectric fillers.

[0006] The present invention is achieved in that:

[0007] A foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material, characterized in that, in parts by mass, the material is prepared from the following components:

[0008] Polypropylene resin: 20-60 parts;

[0009] Continuous glass fiber: 20-60 parts;

[0010] Homopolymer PP: 15-20 parts;

[0011] Hollow glass microspheres: 5-12 parts;

[0012] Azodicarbonamide: 3-7 parts;

[0013] Mesoporous silica: 6-12 parts;

[0014] Graphene aerogel: 3-6 parts;

[0015] Fluoride: 0.5-1 part;

[0016] Compatibilizer: 0.1-1.5 parts;

[0017] Antioxidant: 0.1-2 parts;

[0018] Lubricant: 1 to 2 parts.

[0019] Furthermore, the fluoride is polytetrafluoroethylene.

[0020] Furthermore, the mesoporous silica and graphene aerogel are both nanoporous materials.

[0021] Furthermore, the mass ratio of the mesoporous silica and graphene aerogel is 2:1.

[0022] Furthermore, the mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0023] Furthermore, the fiber length of the continuous glass fiber is greater than 12 mm.

[0024] Furthermore, the continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent to improve the interface bonding between the glass fiber and the homopolymer PP and reduce the interface polarization loss.

[0025] Furthermore, the silane coupling agent is KH-550.

[0026] Furthermore, the compatibilizer is MAH-g-PP.

[0027] Furthermore, the lubricant is silicone powder.

[0028] The beneficial effects of the present invention compared with the prior art are:

[0029] The present invention adds azodicarbonamide as a thermally decomposable foaming agent to the composition. This decomposition at high temperature produces nitrogen and carbon dioxide, which introduces gas micropores to reduce the material's equivalent dielectric constant, thereby forming a foamed structure. Furthermore, the present invention introduces low-dielectric fillers, such as mesoporous silica and hollow glass microspheres, to form a foamed, low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material, addressing the urgent need for low-dielectric constant and low-dielectric-loss materials in fields such as high-frequency communications and millimeter-wave radar. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the following examples are given to further illustrate the present invention in detail. It should be noted that the specific implementation described here is only used to explain the present invention and is not intended to limit the present invention.

[0031] Example 1

[0032] In this embodiment, a foamed low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material is prepared from the following components, measured by weight: polypropylene resin: 20 parts; continuous glass fiber: 20 parts; homopolymer PP: 15 parts; hollow glass microspheres: 5 parts; azodicarbonamide: 3 parts; mesoporous silica: 6 parts; graphene aerogel: 3 parts; fluoride: 0.5 parts; compatibilizer (MAH-g-PP): 0.1 parts; antioxidant: 0.1 parts; and lubricant (silicone powder): 1 part. The fluoride is polytetrafluoroethylene. The mass ratio of the mesoporous silica to the graphene aerogel is 2:1. The mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0033] The fiber length of the continuous glass fiber is greater than 12 mm. The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent (the silane coupling agent is KH-550).

[0034] Example 2

[0035] In this embodiment, a foamed low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material is prepared from the following components, measured by weight: polypropylene resin: 60 parts; continuous glass fiber: 60 parts; homopolymer PP: 20 parts; hollow glass microspheres: 12 parts; azodicarbonamide: 7 parts; mesoporous silica: 12 parts; graphene aerogel: 6 parts; fluoride: 1 part; compatibilizer (MAH-g-PP): 1.5 parts; antioxidant: 2 parts; lubricant (silicone powder): 2 parts. The fluoride is polytetrafluoroethylene. The mass ratio of the mesoporous silica to the graphene aerogel is 2:1. The mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0036] The fiber length of the continuous glass fiber is greater than 12 mm. The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent (the silane coupling agent is KH-550).

[0037] Example 3

[0038] In this embodiment, a foamed low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material is prepared from the following components, measured in parts by mass: polypropylene resin: 30 parts; continuous glass fiber: 30 parts; homopolymer PP: 17 parts; hollow glass microspheres: 10 parts; azodicarbonamide: 6 parts; mesoporous silica: 10 parts; graphene aerogel: 5 parts; fluoride: 0.9 parts; compatibilizer (MAH-g-PP): 0.8 parts; antioxidant: 0.7 parts; and lubricant (silicone powder): 1 part. The fluoride is polytetrafluoroethylene. The mass ratio of the mesoporous silica to the graphene aerogel is 2:1. The mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0039] The fiber length of the continuous glass fiber is greater than 12 mm. The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent (the silane coupling agent is KH-550).

[0040] Example 4

[0041] In this embodiment, a foamed low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material is prepared from the following components, measured by weight: polypropylene resin: 50 parts; continuous glass fiber: 50 parts; homopolymer PP: 17 parts; hollow glass microspheres: 11 parts; azodicarbonamide: 5 parts; mesoporous silica: 8 parts; graphene aerogel: 4 parts; fluoride: 0.6 parts; compatibilizer (MAH-g-PP): 1.2 parts; antioxidant: 1.5 parts; lubricant (silicone powder): 1 part. The fluoride is polytetrafluoroethylene. The mass ratio of the mesoporous silica to the graphene aerogel is 2:1. The mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0042] The fiber length of the continuous glass fiber is greater than 12 mm. The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent (the silane coupling agent is KH-550).

[0043] Example 5

[0044] In this embodiment, a foamed low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material is prepared from the following components, measured by weight: polypropylene resin: 55 parts; continuous glass fiber: 55 parts; homopolymer PP: 19 parts; hollow glass microspheres: 11 parts; azodicarbonamide: 4 parts; mesoporous silica: 11 parts; graphene aerogel: 5.5 parts; fluoride: 0.6 parts; compatibilizer (MAH-g-PP): 1.3 parts; antioxidant: 1.5 parts; and lubricant (silicone powder): 2 parts. The fluoride is polytetrafluoroethylene. The mass ratio of the mesoporous silica to the graphene aerogel is 2:1. The mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0045] The fiber length of the continuous glass fiber is greater than 12 mm. The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent (the silane coupling agent is KH-550).

[0046] Example 6

[0047] In this embodiment, a foamed low-dielectric, low-dielectric-loss continuous long glass fiber-reinforced polypropylene composite material is prepared from the following components, measured by weight: polypropylene resin: 45 parts; continuous glass fiber: 45 parts; homopolymer PP: 18 parts; hollow glass microspheres: 10 parts; azodicarbonamide: 5 parts; mesoporous silica: 12 parts; graphene aerogel: 66 parts; fluoride: 0.8 parts; compatibilizer (MAH-g-PP): 0.4 parts; antioxidant: 1.6 parts; and lubricant (silicone powder): 1.5 parts. The fluoride is polytetrafluoroethylene. The mass ratio of the mesoporous silica to the graphene aerogel is 2:1. The mass ratio of the polypropylene resin to the continuous glass fiber is 1:1.

[0048] The fiber length of the continuous glass fiber is greater than 12 mm. The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent (the silane coupling agent is KH-550).

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A foamed low dielectric, low dielectric loss continuous long glass fiber reinforced polypropylene composite material, characterized in that: The material is prepared from the following components in parts by mass: Polypropylene resin: 20-60 parts; Continuous glass fiber: 20-60 parts; Homopolymer PP: 15-20 parts; Hollow glass microspheres: 5-12 parts; Azodicarbonamide: 3-7 parts; Mesoporous silica: 6-12 parts; Graphene aerogel: 3-6 parts; Fluoride: 0.5-1 part; Compatibilizer: 0.1-1.5 parts; Antioxidant: 0.1-2 parts; Lubricant: 1 to 2 parts.

2. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 1, characterized in that: The fluoride is polytetrafluoroethylene.

3. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 1, characterized in that: The mesoporous silica and graphene aerogel are both nanoporous materials.

4. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 3, characterized in that: The mass ratio of the mesoporous silica and graphene aerogel is 2:

1.

5. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 1, characterized in that: The mass ratio of the polypropylene resin and the continuous glass fiber is 1:

1.

6. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 1, characterized in that: The fiber length of the continuous glass fiber is greater than 12 mm.

7. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 6, characterized in that: The continuous glass fiber needs to be surface treated: the continuous glass fiber is surface treated with a silane coupling agent.

8. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 6, characterized in that: The silane coupling agent is KH-550.

9. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 1, characterized in that: The compatibilizer is MAH-g-PP.

10. The foamed low-dielectric and low-dielectric-loss continuous long glass fiber reinforced polypropylene composite material according to claim 1, characterized in that: The lubricant is silicone powder.