Environment-friendly high-gloss low-floating-fiber continuous reinforced long glass fiber polypropylene composite material

Abstract

The invention discloses an environment-friendly high-gloss low-floating-fiber continuous reinforced long glass fiber polypropylene composite material, and belongs to the field of preparation of polypropylene composite materials, the composite material is prepared from the following components by mass: 20-30 parts of polypropylene particles; 40 to 60 parts of continuous long glass fiber; 20 to 30 parts of copolymerized PP (polypropylene); 5 to 10 parts of maleic anhydride grafted PP (polypropylene); 5 to 10 parts of a silicone lubricant; 0.5 to 0.7 part of a nucleating agent; 0.5 to 1 part of a lubricant; and 1-2 parts of a solubilizer. Through the synergistic effect of the polypropylene, the continuous long glass fiber and the PP-PE copolymer, the copolymerized PP contains an ethylene chain segment, so that the toughness is better, and the surface glossiness of the material is favorably improved; and on the premise that the mechanical property of the composite material is guaranteed, the fluidity and infiltration effect of the composite material are greatly improved, floating fibers of the material are reduced, and the glossiness of the material is improved.

Description

Technical Field

[0001] The invention belongs to the field of preparation of polypropylene composite materials, in particular to an environmentally friendly high-gloss low-floating fiber continuously reinforced long glass fiber polypropylene composite material. Background Art

[0002] Long glass fiber reinforced polypropylene thermoplastic composites, combining low density with high strength, are widely used in various automotive components. More and more car models use this material to produce front-end modules, instrument panel frames, tailgates, door substrates, water channels, storage boxes, etc. However, due to strict requirements for the appearance of the parts, phenomena such as surface floating fibers and glass fiber agglomeration are not allowed. Therefore, how to improve the surface condition of the composite material while ensuring the mechanical properties of the continuous long glass fiber reinforced polypropylene material has become a pressing issue. Even if those skilled in the art have solved the problems of surface floating fibers and glass fiber agglomeration, the mechanical properties and the problems of surface floating fibers and glass fiber agglomeration cannot be solved simultaneously. Summary of the Invention

[0003] In order to overcome the defects of the prior art, the purpose of the present invention is to provide an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material. Through the innovative compounding of maleic anhydride grafted PP and silicone lubricant, as well as the synergistic effect of polypropylene, continuous long glass fiber, and PP-PE copolymer, the composite material of the present invention greatly increases the fluidity and wetting effect of the composite material while ensuring mechanical properties, reduces the floating fiber of the material, and improves the gloss of the material.

[0004] The present invention is achieved in that:

[0005] An environmentally friendly high-gloss, low-floating fiber continuously reinforced long glass fiber polypropylene composite material, characterized in that, in parts by mass, the composite material is prepared from the following components:

[0006] Polypropylene granules: 20-30 parts;

[0007] Continuous long glass fiber: 40-60 parts;

[0008] Copolymer PP: 20-30 parts;

[0009] Maleic anhydride grafted PP: 5-10 parts;

[0010] Silicone lubricant: 5-10 parts;

[0011] Nucleating agent: 0.5-0.7 parts;

[0012] Lubricant: 0.5-1 part;

[0013] Solubilizer: 1 to 2 parts.

[0014] Furthermore, the silicone lubricant is polydimethylsiloxane.

[0015] Furthermore, the copolymerized PP is a PP-PE copolymer.

[0016] Furthermore, the diameter of the continuous glass fiber is 15-20 μm, and the continuous glass fiber needs to be treated with a coupling agent (silane) before use to improve the interfacial compatibility with the PP matrix, reduce floating fibers, and enhance mechanical properties.

[0017] Furthermore, the nucleating agent is a mixture of talc and nano-calcium carbonate. The inorganic nucleating agent of talc and nano-calcium carbonate can promote the crystallization refinement of the PP matrix, improve the crystallinity and uniformity, make the material surface smoother, and improve the glossiness (60° glossiness) by 10%-30%.

[0018] Furthermore, the lubricant is paraffin wax. In the present invention, paraffin wax, polypropylene particles, continuous glass fibers, and copolymerized PP are mixed to reduce melt viscosity, improve processing fluidity, reduce friction damage to the glass fibers in the mold, and help form a smooth layer on the material surface to enhance gloss.

[0019] Furthermore, the solubilizing agent is nano-silicon dioxide.

[0020] Furthermore, in terms of parts by mass, the mass ratio of the polypropylene particles, the continuous long glass fibers, and the copolymerized PP is 1:2:1.

[0021] The beneficial effects of the present invention compared with the prior art are:

[0022] When the maleic anhydride-grafted PP used in this invention is compounded with a silicone lubricant, the maleic anhydride-grafted PP improves interfacial bonding, while the silicone lubricant reduces friction between the melt and the mold. The combined effect of these two makes it easier to form a smooth layer on the material surface. Experimental data shows that when the silicone lubricant is used alone, the glossiness is improved by 10%; when the maleic anhydride-grafted PP and silicone lubricant are added simultaneously, the glossiness can be increased by more than 20%. The present invention also utilizes the synergistic effect of polypropylene, continuous glass fiber, and PP-PE copolymer. The copolymerized PP contains ethylene segments, which have greater toughness and contribute to improving the material's surface gloss. This also significantly increases the fluidity and wetting effect of the composite material while maintaining mechanical properties, reducing fiber floating and improving the material's gloss. DETAILED DESCRIPTION

[0023] 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.

[0024] Example 1

[0025] In this embodiment, an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material is prepared from the following components, calculated by weight: polypropylene particles: 30 parts; continuous long glass fiber: 60 parts; PP-PE copolymer: 30 parts; maleic anhydride grafted PP: 10 parts; silicone lubricant (polydimethylsiloxane): 10 parts; nucleating agent: 0.7 parts; lubricant: 1 part; solubilizer: 2 parts.

[0026] The continuous glass fiber has a diameter of 15-20 μm. It must be treated with a coupling agent (silane) before use. The nucleating agent is a mixture of talc and nano-calcium carbonate. The lubricant is paraffin wax. The solubilizer is nano-silicon dioxide. The weight ratio of the polypropylene particles, continuous glass fiber, and copolymerized PP is 1:2:1.

[0027] Example 2

[0028] In this embodiment, an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material is prepared from the following components, calculated by weight: polypropylene particles: 20 parts; continuous long glass fiber: 40 parts; PP-PE copolymer: 20 parts; maleic anhydride grafted PP: 5 parts; silicone lubricant (polydimethylsiloxane): 5 parts; nucleating agent: 0.5 parts; lubricant: 0.5 parts; solubilizer: 1 part.

[0029] The continuous glass fiber has a diameter of 15-20 μm. It must be treated with a coupling agent (silane) before use. The nucleating agent is a mixture of talc and nano-calcium carbonate. The lubricant is paraffin wax. The solubilizer is nano-silicon dioxide. The weight ratio of the polypropylene particles, continuous glass fiber, and copolymerized PP is 1:2:1.

[0030] Example 3

[0031] In this embodiment, an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material is prepared from the following components, calculated by weight: polypropylene particles: 25 parts; continuous long glass fiber: 50 parts; PP-PE copolymer: 25 parts; maleic anhydride grafted PP: 8 parts; silicone lubricant (polydimethylsiloxane): 7 parts; nucleating agent: 0.6 parts; lubricant: 0.8 parts; solubilizer: 1 part.

[0032] The continuous glass fiber has a diameter of 15-20 μm. It must be treated with a coupling agent (silane) before use. The nucleating agent is a mixture of talc and nano-calcium carbonate. The lubricant is paraffin wax. The solubilizer is nano-silicon dioxide. The weight ratio of the polypropylene particles, continuous glass fiber, and copolymerized PP is 1:2:1.

[0033] Comparative Example 1

[0034] In this embodiment, an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material is prepared from the following components, calculated by weight: polypropylene particles: 30 parts; continuous long glass fiber: 60 parts; PP-PE copolymer: 30 parts; nucleating agent: 0.7 parts; lubricant: 1 part; solubilizer: 2 parts.

[0035] The continuous glass fiber has a diameter of 15-20 μm. It must be treated with a coupling agent (silane) before use. The nucleating agent is a mixture of talc and nano-calcium carbonate. The lubricant is paraffin wax. The solubilizer is nano-silicon dioxide. The weight ratio of the polypropylene particles, continuous glass fiber, and copolymerized PP is 1:2:1. The tested glossiness is 70 GU.

[0036] Comparative Example 2

[0037] In this embodiment, an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material is prepared from the following components, calculated by weight: polypropylene particles: 30 parts; continuous long glass fiber: 60 parts; PP-PE copolymer: 30 parts; silicone lubricant (polydimethylsiloxane): 10 parts; nucleating agent: 0.7 parts; lubricant: 1 part; solubilizer: 2 parts.

[0038] The continuous glass fiber has a diameter of 15-20 μm. It must be treated with a coupling agent (silane) before use. The nucleating agent is a mixture of talc and nano-calcium carbonate. The lubricant is paraffin wax. The solubilizer is nano-silicon dioxide. The weight ratio of the polypropylene particles, continuous glass fiber, and copolymerized PP is 1:2:1.

[0039] When silicone lubricant is used alone, the glossiness is increased by 10% (test glossiness 77GU).

[0040] Comparative Example 3

[0041] In this embodiment, an environmentally friendly high-gloss, low-floating fiber continuous reinforced long glass fiber polypropylene composite material is prepared from the following components, calculated by weight: polypropylene particles: 30 parts; continuous long glass fiber: 60 parts; PP-PE copolymer: 30 parts; maleic anhydride grafted PP: 10 parts; silicone lubricant (polydimethylsiloxane): 10 parts; nucleating agent: 0.7 parts; lubricant: 1 part; solubilizer: 2 parts.

[0042] The continuous glass fiber has a diameter of 15-20 μm. It must be treated with a coupling agent (silane) before use. The nucleating agent is a mixture of talc and nano-calcium carbonate. The lubricant is paraffin wax. The solubilizer is nano-silicon dioxide. The weight ratio of the polypropylene particles, continuous glass fiber, and copolymerized PP is 1:2:1.

[0043] When maleic anhydride grafted PP and silicone lubricant are added at the same time, the glossiness can be increased by more than 20% (test glossiness 84GU.)

[0044] 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. An environmentally friendly high-gloss low-floating fiber continuously reinforced long glass fiber polypropylene composite material, characterized in that: The composite material is prepared from the following components in parts by mass: Polypropylene granules: 20-30 parts; Continuous long glass fiber: 40-60 parts; Copolymer PP: 20-30 parts; Maleic anhydride grafted PP: 5-10 parts; Silicone lubricant: 5-10 parts; Nucleating agent: 0.5-0.7 parts; Lubricant: 0.5-1 part; Solubilizer: 1 to 2 parts.

2. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: The silicone lubricant is polydimethylsiloxane.

3. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: The copolymerized PP is a PP-PE copolymer.

4. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: The diameter of the continuous long glass fiber is 15-20 μm; the continuous long glass fiber needs to be treated with a coupling agent (silane) before use.

5. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: The nucleating agent is a mixture of talcum powder and nano calcium carbonate.

6. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: The lubricant is paraffin.

7. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: The solubilizing agent is nano silicon dioxide.

8. The environmentally friendly high-gloss low-floating fiber continuous reinforced long glass fiber polypropylene composite material according to claim 1, characterized in that: Calculated by mass, the mass ratio of the polypropylene particles, continuous long glass fibers, and copolymerized PP is 1:2:1.