CN111794017A - High-stiffness pulp molding buffer material and preparation method thereof - Google Patents
High-stiffness pulp molding buffer material and preparation method thereof Download PDFInfo
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- CN111794017A CN111794017A CN202010601932.7A CN202010601932A CN111794017A CN 111794017 A CN111794017 A CN 111794017A CN 202010601932 A CN202010601932 A CN 202010601932A CN 111794017 A CN111794017 A CN 111794017A
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- pulp
- parts
- pulp molding
- cushioning material
- molding
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
Abstract
The invention discloses a pulp molding buffer material and a preparation method thereof. The preparation method comprises the following steps: putting 66-84 parts of wood pulp, 6-20 parts of bamboo pulp, 0-28 parts of cane pulp and 3000 parts of water in a stirrer and uniformly stirring; adding 0.2-3 parts of sizing agent and 7000 parts of water into the mixture in sequence, and stirring uniformly; adding 0.5-5 parts of expandable microspheres into the mixture, and uniformly stirring to prepare slurry; and (3) sequentially carrying out vacuum filtration molding and hot pressing and shaping on the slurry to prepare the paper pulp molding buffer material product. The expandable microspheres are introduced as the foaming agent and added in the preparation process of the paper pulp, the traditional preparation process of paper pulp molding is not required to be changed, the foam hole control can be realized by adjusting the temperature and time, the weight of the product can be reduced while the thickness of the product is effectively increased, and the product has a full and smooth surface and strong stereoscopic impression.
Description
Technical Field
The invention relates to the technical field of paper pulp processes, in particular to a preparation method of a high-stiffness paper pulp molding.
Background
The pulp molding is a packaging material obtained by using primary fibers or secondary fibers as main raw materials, dehydrating and molding the fibers by using a special mold, and then drying and shaping the fibers. The paper pulp molding product can be recycled and degraded, has no pollution in the production process, has good shock resistance, buffering property, air permeability and antistatic property, has good waterproof and oil-proof properties after being added with a special process, can completely replace a plastic foaming product, can effectively eliminate white pollution, is a green and environment-friendly packaging material, and has wide application prospect in the packaging fields of electronic products, daily chemical products, fresh foods and the like.
In the prior art, when the foam plastic is subjected to impact load, gas at the center of a pore in the material is compressed, the foam plastic rebounds after external force disappears, and the energy of the impact load is consumed through compression and rebounding, so that the product is protected. The common pulp molding product absorbs external energy by utilizing structural deformation and reduces the impact and vibration on the product, namely the buffering effect of pulp molding is mainly realized by a structural unit, and the buffering performance is very limited. When a large-plane buffer packaging material is required, the pulp molding product is difficult to replace foamed plastic.
The fatal weaknesses of the existing paper pulp molding products are that the quality is relatively heavy, the bearing capacity is insufficient, and the structural strength and the buffering performance are not as good as those of foamed plastics.
The stiffness of the paper product is generally improved by increasing the thickness of the product, so that the bearing capacity of the paper product is enhanced, the minimum thickness of the paper-plastic product is 0.6mm, the maximum thickness of the paper-plastic product can reach 1.5-2.0mm, and the thickness of the product is usually about 0.8-1.0 mm. In order to increase the thickness of the product, paper and plastic enterprises mainly increase the amount of the slurry, which increases the cost of the product and increases the manufacturing difficulty. Due to the fact that the pulp weight is increased, the pulp suction time, the drying time and the structure of a die are influenced, and the manufacturing difficulty of a product is increased.
The plant fiber foaming material is the most commonly used buffering fiber material at present, and chemical foaming agents such as azodicarbonamide, azodiisobutyronitrile, ammonium carbonate, sodium bicarbonate and the like are adopted to decompose at high temperature to generate a large amount of gas to form foam holes to achieve the buffering effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to reduce the quality of the product under the condition of increasing the thickness of the pulp molding product.
In order to solve the technical problem, the invention provides a preparation method of a pulp molding cushioning material, which is characterized by comprising the following steps of:
step 1): putting 66-84 parts of wood pulp, 6-20 parts of bamboo pulp, 0-28 parts of cane pulp and 3000 parts of water in a stirrer and uniformly stirring;
step 2): adding 0.2-3 parts of sizing agent and 7000 parts of water into the mixture obtained in the step 1) in sequence, and stirring uniformly;
step 3): adding 0.5-5 parts of expandable microspheres into the mixture obtained in the step 2), and uniformly stirring to prepare slurry;
step 4): and 3) sequentially carrying out vacuum suction filtration molding and hot pressing shaping on the slurry obtained in the step 3) to prepare a paper pulp molding buffer material product.
Preferably, the stirring time in the step 1) is 10-30min, and the rotation speed is 600-1500 r/min.
Preferably, the stirring time in the step 2) is 10-30min, and the rotation speed is 300-600 r/min.
Preferably, the sizing agent in step 2) is an Alkyl Ketene Dimer (AKD) sizing agent.
Preferably, 0.02-0.1 part of retention aid and 0.3-1.8 part of reinforcing agent are also added into the mixture in the step 2).
More preferably, the retention aid is any one or more of Cationic Polyacrylamide (CPAM), amphoteric polyacrylamide (AMPAM), Polyethyleneimine (PEI), cationic starch, bentonite, and colloidal silica. The retention aid is used for improving the retention rate of the microspheres so that the microspheres cannot flow away with water.
More preferably, the reinforcing agent is any one or more of cationic starch, amphoteric starch, cationic polyacrylamide, styrene-butadiene latex and polyacrylate emulsion. The structure of the fiber in the pulp molding is loose due to the foaming of the microspheres, and the strength of the strength material can be supplemented by adding the reinforcing agent. After the microspheres are foamed, a series of closed-cell cavity structures are formed in the paper and supported among the fibers, the distance between the fibers is increased, the mutual bonding capability is weakened, and the reinforcing agent is added for compounding and using to supplement the strength of the material.
Preferably, the stirring time in the step 3) is 10-40min, and the rotation speed is 300-600 r/min.
Preferably, the process parameters of vacuum suction filtration molding in the step 4) are as follows: the vacuum pressure is 0.05-1MPa, and the pulp suction time is 4-60 s; the technological parameters of hot pressing and shaping are as follows: the hot pressing temperature is 115 ℃ and 165 ℃, and the hot pressing time is 50-140 s.
The invention also provides the pulp molding buffer material prepared by the preparation method of the pulp molding buffer material.
The expandable microspheres are introduced as the foaming agent and added in the preparation process of the paper pulp, the traditional preparation process of paper pulp molding is not required to be changed, the foam hole control can be realized by adjusting the temperature and time, the weight of the product can be reduced while the thickness of the product is effectively increased, and the product has a full and smooth surface and strong stereoscopic impression.
The invention utilizes the foaming technology to enable countless micro-cells to be formed in the material, and the pulp molding product can play a good buffering role like foamed plastic. The paper pulp molding material prepared by the invention is a paper pulp molding buffer product with high thickness, high stiffness, high strength and full three-dimensional structure, and the preparation method has simple process and wide application.
Compared with the prior art, the invention has the beneficial effects that:
1. expandable microspheres are used as a physical foaming agent, and the thickness of a product can be effectively increased by a small amount of microspheres, so that the stiffness of the product is improved, the quality of the product can be reduced, and the bearing capacity of the product is improved;
2. expandable microspheres are used as a physical foaming agent to form foam holes which are uniform in sealing and controllable in size, so that the product has good buffering performance, and meanwhile, the surface is full and smooth, and the stereoscopic impression is strong;
3. the foaming agent is introduced in the pulping process, the traditional process is not changed, the process is simple, and the production is facilitated.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below.
The formulations in examples 1 to 3 and comparative examples 1 to 3 were prepared by mass parts, all of which were commercially available raw materials, and expandable microspheres obtained from kurari technologies (shanghai) ltd.
Example 1
A preparation method of a pulp molding buffer material comprises the following steps:
1. placing 66 parts of wood pulp, 20 parts of bamboo pulp, 14 parts of cane pulp and 3000 parts of water in a stirrer, and stirring for 20min at the rotating speed of 1000 r/min;
2. adding 0.02 part of retention aid cationic polyacrylamide, 0.3 part of reinforcing agent cationic starch, 0.2 part of sizing agent AKD and 7000 parts of water into a stirrer in sequence, and stirring for 10min at the rotating speed of 300 r/min;
3. and adding 0.5 part of expandable microspheres DU120 into the stirrer, and stirring for 10min at the rotating speed of 300 r/min.
4. The pulp is made into a pulp molding product through vacuum filtration molding and hot pressing shaping; the vacuum pressure is 1MPa, the pulp sucking time is 20s, the hot pressing temperature is 115 ℃, and the hot pressing time is 140 s.
Comparative example 1
A preparation method of a pulp molding buffer material comprises the following steps:
1. placing 66 parts of wood pulp, 20 parts of bamboo pulp, 14 parts of cane pulp and 3000 parts of water in a stirrer, and stirring for 20min at the rotating speed of 1000 r/min;
2. sequentially adding 0.2 part of sizing agent AKD and 7000 parts of water into a stirrer, and stirring for 10min at the rotating speed of 300 r/min;
3. the pulp is made into a pulp molding product through vacuum filtration molding and hot pressing shaping; the vacuum pressure is 1MPa, the pulp sucking time is 20s, the hot pressing temperature is 115 ℃, and the hot pressing time is 140 s.
Compared with the pulp molded product obtained in the comparative example 1, the thickness of the pulp molded product obtained in the example 1 is improved by 8.88 percent, the stiffness is improved by 11.99 percent, and the surface is fuller and smoother.
Example 2
A preparation method of a pulp molding buffer material comprises the following steps:
1. placing 84 parts of wood pulp, 16 parts of bamboo pulp and 3000 parts of water in a stirrer, and stirring for 10min at the rotating speed of 600 r/min;
2. sequentially adding 0.05 part of retention aid amphoteric polyacrylamide, 0.8 part of reinforcing agent cationic polyacrylamide, 1 part of sizing agent AKD and 7000 parts of water into a stirrer, and stirring for 20min at the rotating speed of 400 r/min;
3. adding 2 parts of expandable microspheres DU120 into a stirrer, and stirring for 20min at the rotating speed of 400 r/min;
4. the pulp is made into a pulp molding product through vacuum filtration molding and hot pressing shaping; the vacuum pressure is 0.05MPa, the pulp sucking time is 60s, the hot pressing temperature is 130 ℃, and the hot pressing time is 100 s.
Comparative example 2
A preparation method of a pulp molding buffer material comprises the following steps:
1. placing 84 parts of wood pulp, 16 parts of bamboo pulp and 3000 parts of water in a stirrer, and stirring for 10min at the rotating speed of 600 r/min;
2. sequentially adding 1 part of sizing agent AKD and 7000 parts of water into a stirrer, and stirring for 20min at the rotating speed of 400 r/min;
3. the pulp is made into a pulp molding product through vacuum filtration molding and hot pressing shaping; the vacuum pressure is 0.05MPa, the pulp sucking time is 60s, the hot pressing temperature is 130 ℃, and the hot pressing time is 100 s.
Compared with the pulp molded product obtained in the comparative example 2, the thickness of the pulp molded product obtained in the example 2 is improved by 18.86 percent, the stiffness is improved by 23.16 percent, and the surface is fuller and smoother.
Example 3
A preparation method of a pulp molding buffer material comprises the following steps:
1. placing 66 parts of wood pulp, 6 parts of bamboo pulp, 28 parts of cane pulp and 3000 parts of water in a stirrer, and stirring for 30min at the rotating speed of 1500 r/min;
2. sequentially adding 0.1 part of retention aid polyethyleneimine, 1.8 parts of reinforcing agent cationic starch, 3 parts of sizing agent AKD and 7000 parts of water into a stirrer, and stirring for 30min at the rotating speed of 600 r/min;
3. adding 5 parts of expandable microspheres DU1501 into a stirrer, and stirring for 40min at the rotating speed of 600 r/min;
4. the pulp is made into a pulp molding product through vacuum filtration molding and hot pressing shaping; the vacuum pressure is 0.5MPa, the pulp sucking time is 4s, the hot pressing temperature is 165 ℃, and the hot pressing time is 50 s.
Comparative example 3
A preparation method of a pulp molding buffer material comprises the following steps:
1. placing 66 parts of wood pulp, 6 parts of bamboo pulp, 28 parts of cane pulp and 3000 parts of water in a stirrer, and stirring for 30min at the rotating speed of 1500 r/min;
2. sequentially adding 3 parts of sizing agent AKD and 7000 parts of water into a stirrer, and stirring for 30min at the rotating speed of 600 r/min;
3. the pulp is made into a pulp molding product through vacuum filtration molding and hot pressing shaping; the vacuum pressure is 0.5MPa, the pulp sucking time is 4s, the hot pressing temperature is 165 ℃, and the hot pressing time is 50 s.
Compared with the pulp molded product obtained in the comparative example 3, the thickness of the pulp molded product obtained in the example 3 is improved by 29.10 percent, the stiffness is improved by 33.59 percent, and the surface is fuller and smoother.
The thicknesses and stiffness of examples 1-3 and comparative examples 1-3 are shown in Table 1.
TABLE 1
Claims (10)
1. A preparation method of a pulp molding buffer material is characterized by comprising the following steps:
step 1): putting 66-84 parts of wood pulp, 6-20 parts of bamboo pulp, 0-28 parts of cane pulp and 3000 parts of water in a stirrer and uniformly stirring;
step 2): adding 0.2-3 parts of sizing agent and 7000 parts of water into the mixture obtained in the step 1) in sequence, and stirring uniformly;
step 3): adding 0.5-5 parts of expandable microspheres into the mixture obtained in the step 2), and uniformly stirring to prepare slurry;
step 4): and 3) sequentially carrying out vacuum suction filtration molding and hot pressing shaping on the slurry obtained in the step 3) to prepare a paper pulp molding buffer material product.
2. The method for preparing a pulp molding cushioning material as recited in claim 1, wherein the stirring time in step 1) is 10-30min, and the rotation speed is 600-1500 r/min.
3. The method for preparing a pulp molding cushioning material as recited in claim 1, wherein the stirring time in said step 2) is 10-30min, and the rotation speed is 300-600 r/min.
4. The method of claim 1, wherein the sizing agent of step 2) is an alkyl ketene dimer sizing agent.
5. The method for preparing a pulp molding cushioning material according to claim 1, wherein 0.02 to 0.1 part of a retention aid and 0.3 to 1.8 parts of a reinforcing agent are further added to the mixture in the step 2).
6. The method for preparing a pulp molding cushioning material according to claim 5, wherein said retention aid is any one or more of cationic polyacrylamide, amphoteric polyacrylamide, polyethyleneimine, cationic starch, bentonite, and colloidal silica.
7. The method for preparing a pulp molding cushioning material according to claim 5, wherein said reinforcing agent is any one or more of cationic starch, amphoteric starch, cationic polyacrylamide, styrene-butadiene latex, and polyacrylate emulsion.
8. The method for preparing a pulp molding cushioning material as recited in claim 1, wherein the stirring time in said step 3) is 10-40min, and the rotation speed is 300-600 r/min.
9. The method for preparing a pulp molding cushioning material according to claim 1, wherein the process parameters of the vacuum suction filtration molding in the step 4) are as follows: the vacuum pressure is 0.05-1MPa, and the pulp suction time is 4-60 s; the technological parameters of hot pressing and shaping are as follows: the hot pressing temperature is 115 ℃ and 165 ℃, and the hot pressing time is 50-140 s.
10. A pulp molding cushioning material produced by the method for producing a pulp molding cushioning material according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601932.7A CN111794017A (en) | 2020-06-29 | 2020-06-29 | High-stiffness pulp molding buffer material and preparation method thereof |
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| CN202010601932.7A CN111794017A (en) | 2020-06-29 | 2020-06-29 | High-stiffness pulp molding buffer material and preparation method thereof |
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| CN111794017A true CN111794017A (en) | 2020-10-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112761030A (en) * | 2020-12-16 | 2021-05-07 | 江西中竹生物质科技有限公司 | Bamboo pulp foaming material and preparation method thereof |
| CN112761020A (en) * | 2020-11-11 | 2021-05-07 | 运研材料科技（上海）有限公司 | Ultra-light paper pulp molding material and preparation method thereof |
| CN114837011A (en) * | 2021-02-02 | 2022-08-02 | 上海当纳利印刷有限公司 | Paper pulp moulded product and its preparation method |
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