Raw material pretreatment method for straw-based seedling raising pot, product and production method of seedling raising pot

Abstract

The invention discloses a raw material pretreatment method for a straw-based seedling raising pot, a product and a production method of the seedling raising pot. The raw material pretreatment method comprises the following steps: straw materials are dried, subjected to impurity removal and crushed; water accounting for 1.5-6 times by mass of the straw materials is added for wetting; cooking or steam explosion or combined treatment of cooking and steam explosion is performed; cooling is performed; drying and crushing are performed. With adoption of the method, the usability of the straw-based seedling raising pot can be improved, the dosage of an adhesive can be used, and the production cost can be reduced.

Description

technical field

[0001] The invention relates to the utilization of agricultural and forestry biomass and degradable bio-based materials, in particular to a method for preparing straw-based seedling pots and a method for pretreatment of raw materials. Background technique

[0002] my country's grain output has exceeded one trillion catties for three consecutive years, the flower production area has reached 147,500 hectares, 810 million potted plants, and 1.8 billion ornamental seedlings. There is a huge demand for seedling pots. At present, most of the seedlings are planted in plastic seedling pots. When the seedlings grow to the point where they need to be transplanted, they must be taken out and then planted in the soil. This process causes damage to the root system of potted plants, which is not conducive to the growth of potted plants. Pots are not actually recyclable. Bio-based materials refer to a new class of materials manufactured by biological, chemical and physical...

Examples

Embodiment 11

[0071] Chop 10kg of dried corn stalks to ≤5cm; add 60L of aqueous solution (6 times the weight of water as the straw), stir evenly, and soak for 2 hours; cook at 130°C for 60 minutes, cool to 15°C and adjust the pH value to 8 The straw is taken out, squeezed and dehydrated, dried, crushed, and sieved to obtain straw powder with a moisture content of 6% and a mesh size of ≤40.

[0072] Crush each material to under 40 mesh; mix evenly according to the ratio of straw powder:wheat bran powder:adhesive agent:release agent=65:30:5:1 and set aside. The specifications of the seedling bowl are: thickness 0.7mm, inner diameter of the mouth of the bowl Ф70mm, inner diameter of the bottom of the bowl Ф60mm, height 72mm; weigh 20g±0.5g of the stirred powder, put it into the mold cavity, and perform dry hot pressing. Molding process parameters: upper mold temperature 185°C±5°C, lower mold temperature 165°C±5°C, molding pressure 1400kN, pressure holding time 10s.

[0073] The results show t...

Embodiment 12

[0075] Chop 10 kg of dried corn stalks to ≤ 5 cm; add 30 L of aqueous solution (water is 3 times the mass of the straw), which contains 1% hydrochloric acid and 1% hypochlorous acid, stir well, soak for 2 hours; cook at 220 ° C for 1 min , cooled to 80° C. and adjusted to a pH value of 4.5, then the straw was taken out, squeezed and dehydrated, dried, crushed, and sieved to obtain straw powder with a moisture content of 15% and a mesh size of ≤40.

[0076] Crush each material to under 40 mesh; mix evenly according to the ratio of straw powder:wheat bran powder:adhesive agent:release agent=57:40:3:1 and set aside. The specifications of the seedling bowl are: thickness 0.7mm, inner diameter of the mouth of the bowl Ф70mm, inner diameter of the bottom of the bowl Ф60mm, height 72mm; weigh 20g±0.5g of the stirred powder, put it into the mold cavity, and perform dry hot pressing. Molding process parameters: upper mold temperature 185°C±5°C, lower mold temperature 165°C±5°C, molding...

Embodiment 13

[0078] Chop 10kg of dried corncobs to ≤2cm and put them in the reaction kettle; add 40L (water is 4 times the mass of straw) of 0.1% hydrochloric acid solution; cook at 150°C for 30min, cool to 25°C, and adjust the pH After the value reaches 5.5, the corncob is taken out, squeezed and dehydrated, dried, pulverized, and sieved to obtain pretreated corncob powder with a moisture content of 10% and ≤20 mesh. The follow-up pressing method uses the method of CN101580641A "a degradable environmental protection material, container and manufacturing method thereof", plant straw powder 50%-70%, 20%-30% melamine, 2%-6% polypropylene hot melt adhesive, 5% %~8% polyvinyl alcohol, molded at 140~160°C. Specifically, 50% plant straw powder, 30% melamine, 6% polypropylene hot melt adhesive, 8% polyvinyl alcohol, molded at 160°C.

technical field

[0001] The invention relates to the utilization of agricultural and forestry biomass and degradable bio-based materials, in particular to a method for preparing straw-based seedling pots and a method for pretreatment of raw materials. Background technique

[0002] my country's grain output has exceeded one trillion catties for three consecutive years, the flower production area has reached 147,500 hectares, 810 million potted plants, and 1.8 billion ornamental seedlings. There is a huge demand for seedling pots. At present, most of the seedlings are planted in plastic seedling pots. When the seedlings grow to the point where they need to be transplanted, they must be taken out and then planted in the soil. This process causes damage to the root system of potted plants, which is not conducive to the growth of potted plants. Pots are not actually recyclable. Bio-based materials refer to a new class of materials manufactured by biological, chemical and physical...

Examples

Embodiment 11

[0071] Chop 10kg of dried corn stalks to ≤5cm; add 60L of aqueous solution (6 times the weight of water as the straw), stir evenly, and soak for 2 hours; cook at 130°C for 60 minutes, cool to 15°C and adjust the pH value to 8 The straw is taken out, squeezed and dehydrated, dried, crushed, and sieved to obtain straw powder with a moisture content of 6% and a mesh size of ≤40.

[0072] Crush each material to under 40 mesh; mix evenly according to the ratio of straw powder:wheat bran powder:adhesive agent:release agent=65:30:5:1 and set aside. The specifications of the seedling bowl are: thickness 0.7mm, inner diameter of the mouth of the bowl Ф70mm, inner diameter of the bottom of the bowl Ф60mm, height 72mm; weigh 20g±0.5g of the stirred powder, put it into the mold cavity, and perform dry hot pressing. Molding process parameters: upper mold temperature 185°C±5°C, lower mold temperature 165°C±5°C, molding pressure 1400kN, pressure holding time 10s.

[0073] The results show t...

Embodiment 12

[0075] Chop 10 kg of dried corn stalks to ≤ 5 cm; add 30 L of aqueous solution (water is 3 times the mass of the straw), which contains 1% hydrochloric acid and 1% hypochlorous acid, stir well, soak for 2 hours; cook at 220 ° C for 1 min , cooled to 80° C. and adjusted to a pH value of 4.5, then the straw was taken out, squeezed and dehydrated, dried, crushed, and sieved to obtain straw powder with a moisture content of 15% and a mesh size of ≤40.

[0076] Crush each material to under 40 mesh; mix evenly according to the ratio of straw powder:wheat bran powder:adhesive agent:release agent=57:40:3:1 and set aside. The specifications of the seedling bowl are: thickness 0.7mm, inner diameter of the mouth of the bowl Ф70mm, inner diameter of the bottom of the bowl Ф60mm, height 72mm; weigh 20g±0.5g of the stirred powder, put it into the mold cavity, and perform dry hot pressing. Molding process parameters: upper mold temperature 185°C±5°C, lower mold temperature 165°C±5°C, molding...

Embodiment 13

[0078] Chop 10kg of dried corncobs to ≤2cm and put them in the reaction kettle; add 40L (water is 4 times the mass of straw) of 0.1% hydrochloric acid solution; cook at 150°C for 30min, cool to 25°C, and adjust the pH After the value reaches 5.5, the corncob is taken out, squeezed and dehydrated, dried, pulverized, and sieved to obtain pretreated corncob powder with a moisture content of 10% and ≤20 mesh. The follow-up pressing method uses the method of CN101580641A "a degradable environmental protection material, container and manufacturing method thereof", plant straw powder 50%-70%, 20%-30% melamine, 2%-6% polypropylene hot melt adhesive, 5% %~8% polyvinyl alcohol, molded at 140~160°C. Specifically, 50% plant straw powder, 30% melamine, 6% polypropylene hot melt adhesive, 8% polyvinyl alcohol, molded at 160°C.