AU2021101118A4 - Method for preparing foamed buffer material from waste paper recycling sludge - Google Patents
Method for preparing foamed buffer material from waste paper recycling sludge Download PDFInfo
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Abstract
The disclosure belongs to the technical field of packaging materials, and relates to a method
for preparing a foamed buffer material from waste paper sludge. Specifically, the method
includes the following steps: using waste paper sludge as a main fiber raw material and old
5 newspaper pulps, adding a dispersant to lower viscosity of materials, using cationic corn starch
with a high degree of substitution, polyvinyl acetate emulsion and vital wheat gluten as an
adhesive, mixing fully with a foaming agent, a crosslinking agent, a lubricant and a release agent
to form a slurry, pouring into a mold, foaming at 30 W/g for 2 min in a microwave oven,
maintaining at 20 W/g for 2 min after dryness of the slurry reached 60%, and drying at 10 W/g to
10 dryness of material of 93-95%. Demoulding is carried out after the drying is completed to obtain
a foamed buffer material. A foamed buffer material with a relatively low apparent density and a
relatively high compressive strength can be prepared in the disclosure while avoiding secondary
pollution of the waste paper sludge, thereby achieving relatively desired economic and social
benefits.
C3 /1
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Description
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The disclosure belongs to the technical field of packaging materials, and relates to a method for preparing a foamed buffer material from waste paper sludge.
Protection of resources and environment is of great importance to achieve sustainable development in the 21st century. With an increasing scale of international trade and continuous progress of science and technology, countries all over the world pay more attention to environmental issues. At present, most buffer packaging materials for household appliances and precision instruments are mainly expanded polystyrene (EPS) and other foamed plastics. Such packaging materials have desired buffering properties, low cost and simple production processes. However, during production of the foamed plastics, the chlorofluorocarbon (CFC) foaming agent freon can destroy protection by ozone. Moreover, waste thereof cannot be recycled or weathered naturally, and incineration thereof produces toxic gases such as bisphenols, which threatens human health. With increasing integration of the global trade and wider attention of various countries on environmental issues, these non-degradable and unrecyclable buffer packaging materials will be restricted and will eventually be eliminated. Development and application of buffer packaging materials with excellent environmental compatibility has become an inevitable trend in the 21st century.
Lignocellulosic materials are a cost effective and renewable resource, which can be degraded after use without pollution and can be recycled. It is necessary to develop new degradable and comprehensively utilizable green buffer packaging materials that meet environmental protection requirements. Lignocellulosic materials are a cost effective and renewable resource, which can be degraded after use without pollution and can be recycled. Use of the Lignocellulosic materials to prepare buffer materials will enable "green packaging".
During pulping, waste paper is broken into pulp by a pulper, where fibers are damaged, resulting in a large number of fines (about 0.2 mm or less). During thickening of the pulp, the fines are lost with white water. During biological treatment of the white water, wastewater is purified while sludge is produced. About 100-150 kg of sludge (bone dry) is produced for every bone dry metric ton of pulp produced from undeinked pulp. The sludge produced from deinked pulp is even larger in quantity. It can be seen that, paper sludge as a by-product of pulp and papermaking industry is huge in output. Waste paper sludge has about 75-80% of fiber, and inorganic matters as balance. In the sludge, the fibers have an average length of about 0.2 mm, which are actually fines, and the inorganic matters have a relatively high content, and thus the sludge cannot be reused as pulp for papermaking. At present, most papermaking enterprises treat paper sludge by landfilling, open-air storing or incinerating. However, such treatment methods also bring environmental pollution problems. Therefore, how to treat paper sludge in a recyclable, reducible and harmless way has become an urgent problem to be solved. A relatively desirable method to treat papermaking wastes and achieve a high value is producing a packaging foamed buffer material from the waste paper sludge if available.
Regarding researches and achievements of plant fiber-based foamed buffer materials, the patent CNl147978A uses plant fibers processed by an ammonium sulfite method for foaming. The ammonium sulfite method produces black liquor which is difficult to handle and is outdated. Moreover, there is no indicator of a foamed material therein. The patent CN884382A discloses pulverizing hemp stalks, sorghum stalks, and corn stalks and the like into particles by a pulverizer, adding a foaming agent and the like, and foaming through microwaves. This method pulverizes plant stalks into particles and powders, which cannot be form a single fiber, affecting material properties. The patent CN102408738B prepares a foamed buffer material with relatively low density and relatively desired compressive strength by using screened wheat straw pulp as a raw material and additives such as natural adhesive and inorganic foaming agent, kneading, drying by microwave or infrared and foaming. However, as about 5-20% of inorganic foaming agent is used, during foaming with materials, the foaming agent turns into NH3, C02 and H20 in the air, polluting the environment. The patent CN104592542B uses waste paper fibers, an inorganic foaming agent and other additives during preparation of a foamed material, and reuses a waste gas containing NH3, C02 and H20 generated by foaming to achieve clean production of the foamed material. It can reduce secondary pollution in the papermaking industry and achieve a high value while using paper sludge. The product of the patent is promising to replace foamed plastics as a buffer material, achieving better economic and social benefits.
The reference to prior art in the background is not and should not be taken as an acknowledgement or suggestion that the referenced prior art forms part of the common general knowledge in Australia or in any other country.
Waste paper sludge typically has a short length of fines and a high content of inorganic matters. The present disclosure is directed tor preparation of a foamed buffer material from waste paper sludge.
According to one aspect of the disclosure, a method for preparing a foamed buffer material from waste paper sludge includes the following steps:
step (1): thickening waste paper sludge to a solid content of 33-38% to obtain a component A;
step (2): thickening wastepaper pulp to a solid content of 30-36% to obtain a component B;
step (3): adding the component A, a dispersant, the component B, a lubricant, an adhesive, a foaming agent, a crosslinking agent, a catalyst and a release agent to a kneader, kneading fully to form a viscous uniform slurry with a solid content of 30-35%;
step (4): pouring the slurry into a mold, foaming and drying to dryness of 93-95%;
step (5): demoulding after the foaming is completed to obtain a foamed buffer material.
A ratio of the component A to the component B in step (2) is 80:20 to 60:40.
The adhesive is a mixture of cationic corn starch with a high degree of substitution, vital wheat gluten and polyvinyl acetate emulsion used in an amount of 18-24wt% of total mass, where the total mass is a sum of bone dry mass of the component A and the component B.
In the mixture of cationic corn starch with a high degree of substitution, vital wheat gluten and polyvinyl acetate emulsion, a mass ratio of the cationic corn starch with a high degree of substitution, the vital wheat gluten and the polyvinyl acetate emulsion is (60%-80%):(14% 36%):(4%-6%).
The cationic corn starch with high degree of substitution has a degree of substitution of 0.1 0.3.
The foaming agent is an inorganic foaming agent.
The foaming agent is (NH4)2CO3, NH4HCO3 and NaHCO3 in a ratio of 4:3:1. The foaming agent is used in an amount of 18-24% of total mass, where the total mass is a sum of bone dry mass of the component A and the component B.
The lubricant is stearic acid diester in an amount of 0.5-1 wt% of bone dry mass of the component A. The dispersant is sodium polyacrylate in an amount of 0.2-0.4 wt% of total mass and is prepared into a liquid with a solid content of 10% before use; and the release agent is a silicone emulsion in an amount of 0.05 wt% of the total mass; where the total mass is a sum of bone dry mass of the component A and the component B.
The crosslinking agent is urea in an amount of 1-3wt% of total mass; and the catalyst is copper chloride in an amount of 0.05-0.2% of the total mass; where the total mass is a sum of bone dry mass of the component A and the component B.
The foaming is carried out specifically as follows: putting in a microwave oven, foaming at 30 W/g for 2 min, maintaining at 20 W/g for 2 min, drying at 10 W/g to dryness of material of 93-95%.
The step (3) is carried out specifically as follows: adding the component A to the kneader, adding the dispersant, mixing for 20 min, adding the component B, kneading for 20 min, adding the lubricant, kneading, adding the adhesive, kneading, adding the foaming agent, kneading for 20 min, finally adding the crosslinking agent, the catalyst and the release agent and kneading for 20 min to form the viscous uniform slurry with a solid content of 30-36%.
During use of the adhesive, the cationic corn starch with a high degree of substitution and the vital wheat gluten are directly added to a slurry without dissolution, and the polyvinyl acetate is an emulsion.
According to the disclosure, waste paper sludge containing fines and a high content of inorganic matters is used as a main fiber material for foaming, some old newspaper fibers are added to increase compressive strength of the foamed material, and fiber raw materials are directly used without drying.
The adhesive adopts combination of the cationic corn starch with high degree of substitution, the vital wheat gluten and the polyvinyl acetate emulsion. Compared with native corn starch, the cationic corn starch with a high degree of substitution enables solubility in cold water due to the high degree of substitution. Especially, groups attached to a linear molecule increase viscosity stability of the adhesive at a relatively high temperature. When interacting with the vital wheat gluten and the polyvinyl acetate, the cationic corn starch with a high degree of substitution is easy to form a relatively desired viscous, elastic and stretchable film so that during foaming with fibers, a three-dimensional (3D) network structure can be easily formed and uniform foaming with the fibers can be achieved.
Furthermore, crosslinking of the cationic corn starch with a high degree of substitution and the urea in the presence of a catalyst is beneficial to improve foam retention of the material during foaming, thereby obtaining better foaming outcome.
When the foaming agent is (NH4)2CO3, NH4HCO3 and NaHCO3 in a ratio of 4:3:1, the foaming is carried out at 30 W/g for 2 min, 20 W/g for 2 min, then 10 W/g to dryness of 93-95%. This can ensure full foaming of the material throughout an entire foaming process, avoiding collapse of the foamed material due to excessive foaming at an early stage and insufficient foaming at a late stage.
Beneficial effects of the disclosure
The disclosure provides a method for clean production of a foamed buffer material from waste paper fibers, which can obtain a foamed buffer material with a relatively low apparent density and a relatively high compressive strength. The disclosure can reduce secondary pollution of waste paper sludge and turn waste paper sludge into useful materials to achieve relatively desired economic and social benefits.
FIG. 1 shows a process flowchart of the disclosure.
To facilitate better understanding, the disclosure is further described below with reference to examples. The examples only provide a practical description of the content of the disclosure, and do not limit the protection scope of the disclosure. The replacement of conventional techniques by those skilled in the art is also within the protection scope of the disclosure.
Example 1
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After pulping, a pulp was screened by a <p 2.0-2.4 mm pressure screen. Passed components were thickened by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 4:1.
Adhesive: used in an amount of 18% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 20%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 % .
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics thereof were shown in Table 1.
Example 2
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a <p 2.0-2.4 mm pressure screen. Passed components were thickened by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 7:3.
Adhesive: used in an amount of 21% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 22%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 % .
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Example 3
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a <p 2.0-2.4 mm pressure screen. Passed components were concentrated by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 3:2.
Adhesive: used in an amount of 24% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 24%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1%.
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Indicators were shown in Table 1.
Characteristics were shown in Table 1.
Example 4
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a <p 2.0-2.4 mm pressure screen. Passed components were thickened by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 3:2.
Adhesive: used in an amount of 18% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 20%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 % .
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Example 5
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a <p 2.0-2.4 mm pressure screen. Passed components were concentrated by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 7:3.
Adhesive: used in an amount of 18% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 22%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 % .
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Example 6
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-380% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a <p 2.0-2.4 mm pressure screen. Passed components were thickened by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 4:1.
Adhesive: used in an amount of 24% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 24%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 % .
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Comparative Example 1
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a <p 2.0-2.4 mm pressure screen. Passed components were thickened by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 4:1.
Adhesive: used in an amount of 24% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 90%, 4% and 6% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 20%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 % .
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Comparative Example 2
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): the component A was added to a kneader. A dispersant was added, mixed for 20 min and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Adhesive: used in an amount of 24% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of20%.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: urea, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1 %
. Release agent: silicone emulsion, in an amount of 0.05%.
Step (3): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (4): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Comparative Example 3
Step (1): waste paper sludge containing a relatively large amount of water was thickened by a belt filter press to a solid content of 33-38% to obtain a component A.
Step (2): old newspaper was added into a pulper, and water was added. After breaking, a broken slurry was screened by a (p 2.0-2.4 mm pressure screen. Passed components were thickened by a filter press to obtain a slurry, i.e. component B, with a solid content of 30-36%.
Step (3): the component A was added to a kneader. A dispersant was added and mixed for 20 min. The component B was added and kneaded for 20 min. A lubricant was added and kneaded. A polyvinyl acetate emulsion was added. Granular starch was added and kneaded. A solid foaming agent was added and kneaded for 20 min. Then, a crosslinking agent, a catalyst and a release agent were added in sequence and kneaded for 20 min. A viscous uniform slurry with a solid content of 30-35% was formed.
Ratio of fibers: a ratio of the component A to the component B was 4:1.
Adhesive: used in an amount of 24% (based on bone dry fibers, the same below); in the adhesive (100%, the same below), cationic corn starch with a high degree of substitution, the polyvinyl acetate emulsion and vital wheat gluten accounted for 60%, 36% and 4% respectively.
Foaming agent: a ratio of (NH4)2CO3, NH4HCO3 and NaHCO3 was 4:3:1; used in an amount of 2 0 %.
Dispersant: sodium polyacrylate, in an amount of 0.2%.
Crosslinking agent: borax, in an amount of 1%.
Lubricant: stearic acid diester, in an amount of 0.5%.
Catalyst: copper chloride, in an amount of 0.1%.
Release agent: silicone emulsion, in an amount of 0.05%.
Step (4): the slurry was poured into a mold and put in a microwave oven. Foaming was carried out at 30 W/g for 2 min by raising microwave intensity, then at 20 W/g for 2 min, and then at 10 W/g until dryness of material was 93-95%.
Step (5): demoulding was carried out after the foaming was completed to obtain a foamed buffer material. Characteristics were shown in Table 1.
Table 1 Characteristics of foamed buffer material prepared from waste paper recycling sludge
Example Exampl Exampl Exampl Exampl Exampl Comparativ Comparativ Comparativ Item el e2 e3 e4 e5 e6 eExamplel eExample2 eExample3
Density, 60 65 56 56 64 62 60 80 66 2 kg/m
Compressiv
e strength, 80.2 90.1 90.2 85.6 86.2 86.3 70.5 78.1 90.0
kPa
It can be easily seen from the above table that, Example 3 had the best effects.
It can be seen that, the foamed buffer materials prepared from waste paper recycling sludge of the disclosure had a relatively low density and a relatively desired compressive strength, meeting requirements of foamed buffer materials for packaging. The foamed buffer materials of the disclosure can replace some types of foamed plastics. The disclosure can turn waste materials into useful materials and a promising broad market can be expected.
Claims (5)
1. A method for preparing a foamed buffer material from waste paper sludge, comprising the following steps:
step (1): thickening waste paper sludge to a solid content of 33-38% to obtain a component A;
step (2): thickening wastepaper pulp to a solid content of 30-36% to obtain a component B;
step (3): adding the component A, a dispersant, the component B, a lubricant, an adhesive, a foaming agent, a crosslinking agent, a catalyst and a release agent to a kneader, kneading fully to form a viscous uniform slurry with a solid content of 30-35%;
step (4): pouring the slurry into a mold, foaming and drying to dryness of 93-95%;
step (5): demoulding after the foaming is completed to obtain a foamed buffer material.
2. The method according to claim 1, wherein a ratio of the component A to the component B in step (2) is 80:20 to 60:40.
3. The method according to claim 1, wherein the adhesive is a mixture of cationic corn starch with a high degree of substitution, vital wheat gluten and polyvinyl acetate emulsion used in an amount of 18-24wt% of total mass, wherein the total mass is a sum of bone dry mass of the component A and the component B;
wherein in the mixture of cationic corn starch with a high degree of substitution, vital wheat gluten and polyvinyl acetate emulsion, a mass ratio of the cationic corn starch with a high degree of substitution, the vital wheat gluten and the polyvinyl acetate emulsion is (60%-80%):(14% 36%):(4%-6%);
wherein the cationic corn starch with high degree of substitution has a degree of substitution of 0.1-0.3.
4. The method according to claim 1, wherein the foaming agent is an inorganic foaming agent;
wherein the foaming agent is (NH4)2CO3, NH4HCO3 and NaHCO3 in a ratio of 4:3:1 used in an amount of 18-24% of total mass, wherein the total mass is a sum of bone dry mass of the component A and the component B.
5. The method according to claim 1, wherein the lubricant is stearic acid diester in an amount of 0.5-1 wt% of absolute dry mass of the component A; the dispersant is sodium polyacrylate in an amount of 0.2-0.4 wt% of total mass and is prepared into a liquid with a solid content of 10% before use; and the release agent is a silicone emulsion in an amount of 0.05 wt% of the total mass; wherein the total mass is a sum of bone dry mass of the component A and the component B; wherein the crosslinking agent is urea in an amount of 1-3 wt% of total mass; and the catalyst is copper chloride in an amount of 0.05-0.2% of the total mass; wherein the total mass is a sum of bone dry mass of the component A and the component B; wherein the foaming is carried out specifically as follows: putting in a microwave oven, foaming at 30 W/g for 2 min, maintaining at 20 W/g for 2 min, and drying at 10 W/g to dryness of material of 93-95%.
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| CN202010274033.0 | 2020-04-09 | ||
| CN202010274033.0A CN111423614B (en) | 2020-04-09 | 2020-04-09 | Method for preparing foaming buffer material by using waste paper recovered sludge |
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| JP4025444B2 (en) * | 1998-12-07 | 2007-12-19 | 王子製紙株式会社 | Low density foamed paper and method for producing the same |
| CN101993179A (en) * | 2009-08-15 | 2011-03-30 | 邱圣渊 | Processing method and product of papermaking sludge |
| CN104592542B (en) * | 2015-02-05 | 2017-10-27 | 齐鲁工业大学 | A kind of method of waste paper fibre clean manufacturing foamed damping material |
| CN106832988A (en) * | 2017-01-19 | 2017-06-13 | 江南大学 | A kind of preparation method of sludge base environment-friendly degradable transportation and packing material |
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