Polypropylene material with wood performance and its preparation process

Abstract

A polypropylene material with wooden property is prepared from polypropene, talc powder and zin stearate through proportional mixing, drying and injection moulding. Its advantages are proper toughness, impact resistance and rigidity, and high machinability.

Description

technical field

[0001] The invention relates to polymer materials, in particular to a polypropylene material with wood properties and a preparation method thereof. Background technique

[0002] In some devices, such as the inner frame of the armrest on the massage chair, it must be processed by plastic injection molding. The formed frame is required to have good kneadability, impact resistance and rigidity, and also requires certain wood characteristics. Because the outside of the skeleton is wrapped with leather, the combination of the leather and the skeleton is fastened with steam-robbed nails. After the handrail is wrapped, the nails cannot fall off (except for special tools), and the skeleton must not have cracks or deformation. As far as the current polymer materials are concerned, it is really impossible to meet the above requirements. After material research, we choose to modify the existing polypropylene material. For the existing polypropylene material with flexib...

Examples

Embodiment 1

[0018] Example 1 Preparation of polypropylene material with wood properties

[0019] Weigh polypropylene (molecular weight 1×10 5 ) 100 kg, 30 kg of talcum powder and 0.5 kg of zinc stearate are uniformly mixed into a mixture. Dehumidification drying was performed in a dehumidification drying oven (Heraeus D-72336 manufactured in Germany), the drying temperature was 110° C., and the drying time was 3 hours. The dried polypropylene mixture was used for injection molding. Ningbo HT300 injection molding machine is used for injection molding. The conventional process is: heating→premolding→injection→clamping→pressure holding→cooling→opening→ejection→packing. The specific operating conditions are: feeding amount 130mm, heating temperature 160°C, injection time 10 seconds, injection speed (three levels) 35 m / s → 55 m / s → 25 m / s, injection pressure 60kg / cm 2 , clamping force 100kg / cm 2 , holding pressure 15kg / cm 2 , the holding time is 2 seconds, and the cooling time is 30 second...

Embodiment 2

[0020] Example 2 Preparation of polypropylene material with wood properties

[0021] Weigh polypropylene (molecular weight 8×10 4 ) 100 kg, 40 kg of talcum powder and 10 kg of zinc stearate are uniformly mixed into a mixture. Dehumidification drying was carried out in a dehumidification drying oven (Heraeus D-72336 manufactured in Germany), the drying temperature was 100° C., and the drying time was 4 hours. The dried polypropylene mixture was used for injection molding. Ningbo HT300 injection molding machine is used for injection molding. The conventional process is: heating→premolding→injection→clamping→pressure holding→cooling→opening→ejection→packing. The specific operating conditions are: feeding amount 135mm, heating temperature 170°C, injection time 12 seconds, injection speed (three levels) 35 m / s→55 m / s→25 m / s, injection pressure 65kg / cm 2 , clamping force 90kg / cm 2 , holding pressure 20kg / cm 2 , the holding time is 3 seconds, and the cooling time is 40 seconds.

technical field

[0001] The invention relates to polymer materials, in particular to a polypropylene material with wood properties and a preparation method thereof. Background technique

[0002] In some devices, such as the inner frame of the armrest on the massage chair, it must be processed by plastic injection molding. The formed frame is required to have good kneadability, impact resistance and rigidity, and also requires certain wood characteristics. Because the outside of the skeleton is wrapped with leather, the combination of the leather and the skeleton is fastened with steam-robbed nails. After the handrail is wrapped, the nails cannot fall off (except for special tools), and the skeleton must not have cracks or deformation. As far as the current polymer materials are concerned, it is really impossible to meet the above requirements. After material research, we choose to modify the existing polypropylene material. For the existing polypropylene material with flexib...

Examples

Embodiment 1

[0018] Example 1 Preparation of polypropylene material with wood properties

[0019] Weigh polypropylene (molecular weight 1×10 5 ) 100 kg, 30 kg of talcum powder and 0.5 kg of zinc stearate are uniformly mixed into a mixture. Dehumidification drying was performed in a dehumidification drying oven (Heraeus D-72336 manufactured in Germany), the drying temperature was 110° C., and the drying time was 3 hours. The dried polypropylene mixture was used for injection molding. Ningbo HT300 injection molding machine is used for injection molding. The conventional process is: heating→premolding→injection→clamping→pressure holding→cooling→opening→ejection→packing. The specific operating conditions are: feeding amount 130mm, heating temperature 160°C, injection time 10 seconds, injection speed (three levels) 35 m / s → 55 m / s → 25 m / s, injection pressure 60kg / cm 2 , clamping force 100kg / cm 2 , holding pressure 15kg / cm 2 , the holding time is 2 seconds, and the cooling time is 30 second...

Embodiment 2

[0020] Example 2 Preparation of polypropylene material with wood properties

[0021] Weigh polypropylene (molecular weight 8×10 4 ) 100 kg, 40 kg of talcum powder and 10 kg of zinc stearate are uniformly mixed into a mixture. Dehumidification drying was carried out in a dehumidification drying oven (Heraeus D-72336 manufactured in Germany), the drying temperature was 100° C., and the drying time was 4 hours. The dried polypropylene mixture was used for injection molding. Ningbo HT300 injection molding machine is used for injection molding. The conventional process is: heating→premolding→injection→clamping→pressure holding→cooling→opening→ejection→packing. The specific operating conditions are: feeding amount 135mm, heating temperature 170°C, injection time 12 seconds, injection speed (three levels) 35 m / s→55 m / s→25 m / s, injection pressure 65kg / cm 2 , clamping force 90kg / cm 2 , holding pressure 20kg / cm 2 , the holding time is 3 seconds, and the cooling time is 40 seconds.