WO2014169448A1

WO2014169448A1 - Environmentally friendly stone paper and preparation method therefor

Info

Publication number: WO2014169448A1
Application number: PCT/CN2013/074311
Authority: WO
Inventors: 王德成; 姚丹; 刘俊豪; 夏开邦
Original assignee: 香港格林天使科技有限公司
Priority date: 2013-04-17
Filing date: 2013-04-17
Publication date: 2014-10-23

Abstract

Disclosed are environmentally friendly stone paper and a preparation method therefor. Components of the environmentally friendly stone paper comprise a resin and a short fiber. The short fiber is a fiber product with a fiber length ranging from 10 mm to 15 mm. Because the short fiber replaces calcium carbonate, a main component in the conventional stone paper, the proportion of the stone paper is reduced, and physical mechanical performances are improved, thereby providing wide application values.

Description

Environmentally friendly stone paper and preparation method thereof

The invention relates to the field of papermaking, in particular to environmentally friendly stone paper and a preparation method thereof.

Background technique

Paper is one of the four major inventions in China. The main raw material of traditional paper is wood. Its production is largely divided into two basic processes: pulping and papermaking. Pulping is the disintegration of raw materials into natural pulp or bleached pulp. In papermaking, pulp fibers suspended in water are processed into various papers to meet the requirements. At present, with the introduction of national forest protection policies, papermaking materials are mainly maintained by imported wood pulp. At the same time, due to the large amount of wastewater generated in the traditional paper production process, the environment is seriously polluted, the treatment is extremely difficult, and the traditional paper is not resistant to moisture, corrosion, dimensional stability and various physical and mechanical energy, which cannot meet the special requirements of many paper fields. Requirements, therefore, the development of paper production requires innovation.

In the 1950s, environmentally friendly synthetic papers were produced using plastics, calcium carbonate and various additives as raw materials by blown film casting and casting. The environmentally-friendly synthetic paper is characterized in that its physical and mechanical properties are superior to those of conventional paper, and it has the characteristics of moisture resistance, water resistance, dimensional stability, etc., thus meeting various requirements in different fields, and replacing traditional paper in some fields. A reform of the paper industry. The new environmentally friendly synthetic paper, stone paper, has appeared in this revolution.

The existing stone paper is characterized in that it is mainly composed of a resin and calcium carbonate. In order to reduce the cost of stone paper, it is necessary to increase the proportion of calcium carbonate in the stone paper, thereby reducing the amount of the resin, thereby reducing the cost. However, the problem that comes with it is that as the proportion of calcium carbonate increases, its functional function gradually decreases, and the physical and mechanical energy of the prepared stone paper decreases, resulting in a decrease in the quality of the stone paper. On the other hand, although the proportion of calcium carbonate is increased to reduce the proportion of the resin, the specific gravity of the prepared stone paper is increased, which in turn causes a reduction in the amount of paper actually produced, thereby compressing the actual space for cost reduction.

Summary of the invention

According to an aspect of the present invention, an environmentally friendly stone paper comprising a resin and a short fiber, wherein the short fiber is a fiber product having a fiber length of 10 to 15 mm is provided. The environmentally friendly stone paper may or may not contain calcium carbonate depending on the demand for rigidity or the like in actual use of the paper.

In the present invention, the short fibers may be cotton staple fibers, and the resin may be polyethylene or polypropylene.

Further, the short fibers are preferably short cotton linters, and the resin is preferably polyethylene.

Among them, the weight percentage of the short fibers is preferably 30 to 50%, and preferably the weight percentage of the resin is 47 to 67%.

The above environmentally friendly stone paper further includes an auxiliary agent having a weight percentage of 2.2 to 4.5%, and the auxiliary agent includes a composite coupling agent, a flame retardant, a compatibilizer or a slip agent.

Further preferably, the composite coupling agent accounts for 0.2-0.5%, the flame retardant accounts for 0.5-1%, the compatibilizer accounts for 0.5-1%, and the slip agent accounts for 0.5-2%. According to another aspect of the present invention, there is also provided a three-layer co-extruded environmentally friendly stone paper comprising a skin layer and a base layer, the components of the base layer comprising short fibers, a resin and an auxiliary agent; and the surface layer component comprising titanium dioxide, resin and auxiliary Agent.

The composition of the environmentally friendly stone paper base layer preferably comprises 30-50% of short fibers, 47-67% of resin, and 2.2% to 4.5% of auxiliary agent, based on the mass percentage of the base layer.

The composition of the eco-friendly stone paper surface layer preferably comprises 32-64% titanium dioxide, 33-65% resin and 2.2%-4.5% auxiliary agent in terms of surface layer percentage.

Further, among the components of the surface layer and the base layer, the short fibers are preferably short cotton linters, and the resin is preferably polyethylene. Among the polyethylenes, high density polyethylene accounts for 55-65%, and low density polyethylene accounts for 25-35%, linear. Low density polyethylene accounts for 5-15%.

The above auxiliary agents include a composite coupling agent, a flame retardant, a compatibilizer or a slip agent. Further preferably, the composite coupling agent accounts for 0.2-0.5%, the flame retardant accounts for 0.5-1%, the compatibilizer accounts for 0.5-1%, and the slip agent accounts for 0.5-2%, which are respectively calculated as the percentage of the base layer or the surface layer mass. .

The components of the above base layer may further include calcium carbonate.

The three-layer co-extruded green stone paper structure is a surface layer-base layer-surface layer, and the base layer is sandwiched between two surface layers, and the paper thickness thereof may be 0.08-0.15 mm, and the thickness of the base layer and the surface layer may be adjusted according to actual needs, preferably the base layer. The thickness accounts for 70%-90% of the total thickness of the environmentally friendly stone paper, and the thickness of each surface layer accounts for 5%-15% of the total thickness of the environmentally friendly stone paper.

According to still another aspect of the present invention, a method for preparing a three-layer co-extruded environmentally friendly stone paper is provided, the method comprising:

A. The components are dried to a water content of less than 2%, and the components and ratios can be referred to the above description;

B. Mixing the components of the base layer and the components of the surface layer at 100-110 ° C, respectively, in the order of mixing,

Base layer: Adding an auxiliary agent to the short fiber, adding the resin after mixing;

Surface layer: Adding an auxiliary agent to the titanium dioxide, mixing and adding the resin;

C. The components of the mixed base layer and the components of the surface layer are respectively granulated by vacuum kneading to obtain surface layer particles and base layer particles;

D. The three layers of the surface layer and the base layer are co-extruded to prepare an environmentally friendly stone paper having a surface layer-base layer-surface layer three-layer structure.

In the above step B, when the auxiliary agent is added, the order of adding the auxiliary agent is to sequentially add a composite coupling agent, a flame retardant, a compatibilizer, a slip agent, and after each component is added, the mixture is thoroughly mixed and then added to another Kind.

In the above step D, a three-layer co-extrusion five-roll calender is used, which comprises an extruder part and a calender part, and the extrusion temperature of each section in the extruder is set to 90-110 ° C, 220-240 ° C, 100-120 °C, calender temperature setting is less than 150 °C.

Since the above technical solutions are used, the beneficial effects of the present invention are: 1. By introducing short fibers into environmentally friendly stone paper, the proportion of environmentally friendly stone paper can be reduced, physical and mechanical properties such as rigidity, stiffness, flexibility, etc. are improved, tear strength is greatly enhanced, and dimensional stability of environmentally friendly stone paper is also more stable. good.

2. The partial or complete replacement of calcium carbonate by short fibers in environmentally friendly stone paper can greatly reduce the proportion of environmentally friendly stone paper, thereby reducing the amount of resin and reducing the cost of the product. Therefore, the new environmentally friendly stone paper has higher economic benefits.

3. Use the surface layer - the base layer - the three-layer structure of the surface layer, the base layer and the surface layer components are different, each playing a different role. The base layer plays a supporting role and plays a decisive role in the improvement of various physical and mechanical properties of environmentally friendly stone paper; the surface layer is smooth, has a certain hardness, and has high wetting tension, good coloring performance, and is favorable for printing, the environmentally friendly stone paper of the invention It is especially suitable for applications requiring high physical and mechanical properties and small dimensional deformation, such as maps, charts, petroleum, geology, earthquake disaster maps, and national land mapping.

DRAWINGS

Figure 1 is a structural view of a novel environmentally-friendly stone paper of the present invention, wherein 1 represents a base layer and 2 represents a surface layer;

2 is a flow chart of preparation of a novel environmentally-friendly stone paper of the present invention;

Fig. 3 is a schematic view showing the calendering process in the preparation step of a novel environmentally-friendly stone paper of the present invention, wherein 3 denotes an extruder, 4 denotes a die, 5 denotes a calender, and 6 denotes a winder. detailed description

Different from the traditional stone paper, the invention replaces the main component of the conventional stone paper of the prior art with short fiber as the main component, and the prepared paper has the basic performance of the traditional stone paper compared with the traditional stone paper. The characteristics are also optimized to various degrees in various performances. Therefore, the present invention discloses a novel environmentally-friendly stone paper.

The short fibers in the present invention are fiber products having a fiber length of 10 to 15 mm, and cotton short fibers, short glass fibers, and the like can be used, and short cotton linters are preferably used. The short cotton linter used in the present invention refers to a short fiber remaining on the cotton seed after the cotton seed is rolled, and is a short cotton fiber which cannot be woven. After introducing it into environmentally-friendly stone paper, a series of changes have been made in the quality of environmentally friendly stone paper. The outstanding beneficial effect is to reduce the proportion of environmentally-friendly stone paper, and at the same time optimize the physical and mechanical properties of environmentally friendly stone paper, flexibility and Dimensional stability has also been enhanced, further enabling qualitative changes in the definition, characteristics, advantages and applications of traditional stone paper. Those skilled in the art can appropriately adjust the components of the environmentally-friendly stone paper according to the actual use requirements of the paper, so that the mechanical properties thereof meet the requirements, for example, calcium carbonate and the like can be further added according to actual needs.

The invention further provides a three-layer co-extruded environmental protection stone paper comprising a surface layer and a base layer, the structure of which is shown in FIG. 1 : a three-layer structure of a surface layer-base layer-surface layer. Among them, the components of the base layer mainly include short fibers, resins and auxiliary agents. In the present invention, it is preferred that the composition of the base layer comprises 30-50% of short fibers, 47-67% of resin, and 2.2% to 4.5% of auxiliary agent in terms of the mass percentage of the base layer. Table The components of the layer include titanium dioxide, a resin and an auxiliary agent, wherein the titanium dioxide has a light blocking effect and a whitening effect. Preferably, the surface layer component of the present invention comprises 32-64% titanium dioxide, 33-65% resin, and 2.2%-4.5% auxiliary agent in terms of surface layer percentage.

The three-layer co-extruded environmentally friendly stone paper of the present invention has different base layers and surface layers, and therefore has different effects. The base layer has a supporting effect, which plays a decisive role in the physical and mechanical properties of environmentally friendly stone paper; the surface layer is mainly used for printing. Those skilled in the art can appropriately adjust the components of the above-mentioned base layer and surface layer according to the actual use requirements of the paper, so that the mechanical properties thereof meet the requirements, and the base layer components are preferably short cotton linters, and can also be at the base layer according to actual needs. Further, components such as calcium carbonate are added. In addition, the thickness of the environmentally-friendly stone paper is 0.08-0.15 mm, and the thickness ratio of the surface layer and the base layer can be adjusted according to the printing conditions, the printing requirements, and the physical and mechanical properties of the sheet. In the present invention, the thickness of the base layer is preferably environmentally friendly. 70%-90% of the thickness of the stone paper, the thickness of each surface layer accounts for 5%-15% of the thickness of the environmentally-friendly stone paper, the thickness of the upper surface layer can be the same, or can be adjusted to different thicknesses as needed. In one embodiment in accordance with the invention, the base layer thickness of the paper is 90% and the upper and lower layers each account for 5%.

The resin in the surface layer and the base layer component of the present invention may be polyethylene or polypropylene or the like, and those skilled in the art may select a suitable resin type according to the actual requirements of paper manufacture. Polyethylene is preferred in the present invention, wherein the high density polyethylene accounts for 55-65%, the low density polyethylene accounts for 25-35%, and the linear low density polyethylene accounts for 5-15%, in accordance with the present invention. Further preferably, in the embodiment, in the polyethylene, the high density polyethylene accounts for 60%, the low density polyethylene accounts for 30%, and the linear low density polyethylene accounts for 10%.

The auxiliaries in the surface layer and the base layer component of the present invention mainly include a composite coupling agent, a flame retardant, a compatibilizer (also referred to as a compatibilizer), and a slip agent (also referred to as a dispersant). Wherein, the composite coupling agent used in the base layer is the name thereof, and does not mean that it is composed of a mixture of a plurality of coupling agents, and the function thereof is to achieve a good linkage between the components such as short cotton linters and the resin, and those skilled in the art can The resin, short cotton linter and other components used, and a suitable composite coupling agent, such as OL-AT series aluminum-titanium composite coupling agent, may be selected. In some embodiments, the composite coupling agent may also be shared with the silane coupling agent. To increase the link strength. During the preparation process, the extrusion pressure is delayed, and the components used for preparing the base layer and the surface layer are in a molten state in a fluid form, and should have internal lubrication and external lubrication properties, that is, there should be good lubrication between the inside of the melt, between the melt and the metal. Guaranteed, therefore, it is necessary to choose a good slip agent as an auxiliary agent to ensure good lubrication. For example, RH type lubricant can be used as a slip agent, or WP type polypropylene wax or WE type polyethylene wax can be selected. The function of the flame retardant is to make the paper have the function of fire prevention. For example, the flame retardant PP (this name) can be selected, which is effective and environmentally friendly, and the FZY series composite flame retardant and smoke suppressant can also be used as the flame retardant. In addition, the auxiliary agent may be selected according to the selected resin. For example, the slip agent may be selected from polyethylene wax or polypropylene wax according to the resin selected (for example, the resin is polyethylene, and the smoothing agent is polyethylene wax; If the resin is polypropylene, the smoothing agent is made of polypropylene wax. The compatibilizer can be selected from POE8100 type compatibilizer or POE8210 type compatibilizer. In the present invention, the composite coupling agent is preferably 0.2-0.5%, which is resistant. The flammable agent accounts for 0.5-1%, the compatibilizer accounts for 0.5-1%, and the slip agent accounts for 0.5-2%, which are calculated as the percentage of the base layer or the surface layer respectively.

A method for preparing a three-layer co-extruded environmentally friendly stone paper according to an embodiment of the present invention, as shown in FIG. 2, includes: Step A, drying all components to a water content of less than 2% to ensure smooth process flow get on. Step B, the components of the base layer and the components of the surface layer are respectively added to a high-speed mixer and mixed and stirred at 100-110 ° C, the mixing sequence is, the base layer: firstly stir the short fibers for 3-5 minutes, then add the auxiliary stirring. After mixing for 3-5 minutes, add the resin and stir for 3-5 minutes. Surface layer: Stir the titanium dioxide for 3-5 minutes, then add the auxiliary agent for 3-5 minutes. Mix the mixture and add the resin for 3-5 minutes. In step C, the components of the mixed base layer and the components of the surface layer are respectively subjected to vacuum kneading and then granulated to obtain surface layer particles and base layer particles, respectively. Step D, the surface layer particles and the base layer particles are sent to an extruder, as shown in FIG. 3, heated in an extruder, flowed out through the die, and then calendered to a desired thickness by a calender, and appropriately processed and then passed through a winder. The paper was prepared to obtain an environmentally friendly stone paper having a surface layer-base layer-surface three-layer structure.

Take short cotton lining as an example, and further details are as follows.

In the preparation method according to an embodiment of the present invention, the short lint is added to the coupling agent and other auxiliary agents at about 110 ° C in a high-speed stirrer, stirred at a low speed for about 3-5 minutes, and then added with a resin, low-speed stirring 3 - 5 minutes, that is, a good link between the short cotton linters and the resin, and the two are integrated to ensure the consistency of the performance of the environmentally friendly stone paper. In order to ensure the mixing plasticization effect and improve the product quality, the order of adding the auxiliary agent of the base layer is preferably firstly added with a composite coupling agent, then adding a flame retardant, a compatibilizer, a slip agent, and sufficient after each auxiliary agent is added. Mix, such as mixing for one minute before adding another.

In the above preparation process, when the base layer and the surface layer particles are fed into the extruder of the three-layer co-extrusion five-roll calender, the resin of the base layer, the short lint system and the surface layer of the titanium dioxide and the resin system are required to ensure the rheology of the fluid. Good performance. At this time, the evaluation criteria for good melt flow properties of the base layer and the surface layer are that the melt flow rate should be > 1 to maintain the consistency of the flow properties. The melt flow rate is determined by the choice of resin, formulation, process, and those skilled in the art will be able to control the melt flow rate under appropriate conditions. The temperature of each section during extrusion is set to be about 90-110 °C ->220-240 °C ->100-120 °C, preferably 100 °C ->240 °C ->110 °C The temperature setting of the calender should be below the Vicat softening point of the component, that is, below 150 °C. Before the winding, the corona treatment, static elimination, and on-line thickness non-contact measurement can be further added.

The invention will now be further described in detail by way of specific examples. In the following examples, the polyethylene used was a commercially available Saudi HTA-001HD polyethylene, and the titanium dioxide used was R960 titanium dioxide of DuPont, USA. The composite coupling agent used was 27 of Shenzhen Superior Changhao Technology Co., Ltd. #复合式耦合剂, the slip agent used is 8丁-108# slip agent of Shanghai Songya Chemical Co., Ltd. The flame retardant used is the inorganic flame retardant of Guangzhou Jiazhuo Trading Co., Ltd. The compatibilizer used is the WP-11 increase of Shanghai Jinshan Star Plastic Co., Ltd. For the agent, the short cotton linters used are the short cotton linters of Henan Kaifeng Cotton Production Co., Ltd. The calcium carbonate used is Nanjing Omega calcium carbonate. Example 1

Prepare environmentally friendly stone paper according to the following formula.

The surface layer components (the weight percentage of each component is based on the surface layer mass): polyethylene 57.5%, titanium oxide 40%, composite coupling agent 0.5%, flame retardant 0.5%, compatibilizer 0.5%, slip agent 1%.

Base component (weight percent of each component based on base mass): 55% polyethylene, 42.5% short cotton, 0.5% composite coupling, 0.5% flame retardant, 0.5% compatibilizer, 1% slip agent . The specific preparation process is as follows:

1. Place the above components in a vacuum drying oven, dry to a moisture content of less than 2%, and remove for use.

2. Place the short cotton linters and titanium dioxide in a high-speed mixer separately, set the temperature to about 100-110 °C, and stir at low speed for 3-5 minutes.

3. Add the composite coupling agent, flame retardant, compatibilizer, and slip agent to the heated short lint and titanium dioxide, respectively, and add one minute between each additive, then mix the short lint mixture. The mixture with titanium dioxide was placed in a high-speed mixer separately, set at a temperature of 100-110 ° C, and stirred at a high speed for 3-5 minutes.

4. Mix the short lint auxiliary mixture with the resin separately, mix the titanium dioxide auxiliary mixture with the resin, stir well, then send it to the vacuum kneader for kneading, then send it to the granulator to granulate separately to obtain the surface particles. And base particles.

5. The surface particles and the base particles are sent to the extruder, and the temperature of each section during extrusion is set to about 100 ° C -> 240 ° C -> 110 ° C, the particles are melted into a molten state, through the die After flowing out, it is pressed to a desired thickness by a calender roll, and the temperature of the calender is set to 150 ° C or less, and then corona treatment, static elimination, on-line thickness non-contact measurement, and the like are completed, and the product is wound up to obtain a product. 1. Example 2

Base layer components (weight percent of each component based on the mass of the base layer): polyethylene 67%, short cotton linter 30.8%, composite coupling agent 0.2%, flame retardant 0.5%, compatibilizer 0.5%, slip agent 1% .

The preparation procedure was the same as in Example 1 to obtain the product 2. Example 3 Prepare environmentally friendly stone paper according to the following formula.

Base layer components (weight percent of each component based on the mass of the base layer): 45.5% polyethylene, 50% short cotton, 0.5% composite coupling, 1% flame retardant, 1% compatibilizer, 2% slip agent .

The preparation procedure was the same as in Example 1, and the product 3 was obtained. Example 4

Base layer components (weight percent of each component based on the mass of the base layer): 47% polyethylene, 48.5% short cotton, 0.5% composite coupling, 1% flame retardant, 1% compatibilizer, 2% slip agent .

The preparation procedure was the same as in Example 1, and the product 4 was obtained. Example 5

Base layer components (weight percent of each component in terms of base layer mass): 66.7% polyethylene, 30% short cotton, 0.3% composite coupling, 0.75% flame retardant, 0.75% compatibilizer, 1.5% slip agent .

The preparation procedure was the same as in Example 1, and the product 5 was obtained. Example 6

The surface layer components (the weight percentage of each component is based on the surface layer mass): polyethylene 63.5%, titanium dioxide 32%, composite coupling agent 0.5%, flame retardant 1%, compatibilizer 1%, slip agent 2%.

Base component (weight percent of each component based on base mass): 55% polyethylene, 42.5% short cotton, 0.5% composite coupling, 0.5% flame retardant, 0.5% compatibilizer, 1% slip agent .

The preparation procedure was the same as in Example 1, and the product 6 was obtained. Example 7

The surface layer components (the weight percentage of each component is based on the surface layer): polyethylene 33.8%, titanium dioxide 64%, composite coupling agent 0.2%, flame retardant 0.5%, compatibilizer 0.5%, slip agent 1%.

Base component (weight percent of each component based on base mass): 55% polyethylene, 42.5% short cotton, 0.5% composite coupling, 0.5% flame retardant, 0.5% compatibilizer, 1% slip agent . The preparation procedure was the same as in Example 1 to obtain the product 7. Example 8

Surface composition (the weight percentage of each component is based on the surface quality): polyethylene 65%, titanium dioxide 32.7%, composite coupling agent 0.3%, flame retardant 0.5%, compatibilizer 0.5%, slip agent 1%.

The preparation procedure was the same as in Example 1, and the product 8 was obtained. Example 9

Surface composition (the weight percentage of each component is based on the surface quality): polyethylene 33%, titanium dioxide 63.7%, composite coupling agent 0.3%, flame retardant 0.75%, compatibilizer 0.75%, slip agent 1.5%.

The preparation procedure was the same as in Example 1, and the product 9 was obtained. Example 10

Base layer components (weight percent of each component based on the mass of the base layer): 50% polyethylene, 35% short cotton, 12.5% calcium carbonate, 0.5% composite coupling agent, 0.5% flame retardant, 0.5% compatibilizer, Slip agent 1%.

The preparation procedure is the same as in Example 1 (in step 2, calcium carbonate is added together with short cotton linter) to obtain product 10.

The above-mentioned products 1-10 have a paper thickness of 0.12 ± 0.03 mm, a base layer thickness of 90% of the paper thickness, and an upper surface layer thickness of 5% of the paper thickness. Comparative example

The above-mentioned products 1-10 and the conventional PP (polypropylene) single-layer stone paper were compared with the relevant indexes as follows, and the results are shown in Table 1.

Table 1 Fracture yield size fracture

Specific cost

Elongation tensile strength deformability tensile strength

(g/cm ³ ) (; 10,000 yuan / ton)

(%) (N/mm ² ) (%) (N/mm ² )

Product 1 1.0 410 26 <2 30 0.58 Product 2 1.0 410 27 <2 29 0.59 Product 3 1.0 400 28 <2 31 0.60 Product 4 1.0 390 28 <2 31 0.61 Product 5 0.9 400 27 <2 30 0.60 Product 6 0.9 380 28 <2 30 0.60 Product 7 1.0 390 26 <2 31 0.59 Product 8 1.0 400 28.2 <2 31 0.58 Product 9 1.0 410 26 <2 31 0.59 Product 10 1.1 400 26 <2 30 0.60

Control 1.2 330 20 <3 20 0.60

Note: The control is PP single-layer stone paper, the formula is (by mass percentage): PP (polypropylene homopolymer) 47.2%, calcium carbonate 50%, coupling agent 0.8%, flame retardant 0.5%, compatibilization 0.5% agent, 1% slip agent.

It can be seen from Table 1 that the environmentally friendly stone paper prepared according to the present invention has a lower specific gravity than the conventional stone paper in the comparison of the above indexes, and has various physical and mechanical properties, such as high elongation at break, high tensile strength at yield, tensile strength at break. high. Meanwhile, the stone paper according to the present invention has a lower percentage of the dimensional change rate in the stability test than the PP stone paper, that is, the dimensional stability is good. On the cost side, since the environmentally-friendly stone paper according to the present invention has a low specific gravity, the actual number of sheets produced is larger than that of PP stone paper, thereby reducing the cost per unit paper. The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the above specific embodiments may be modified according to the idea of the present invention.

Claims

Rights request

An environmentally friendly stone paper, the composition comprising a resin, characterized in that: the component further comprises short fibers, and the short fibers are fiber products having a fiber length of 10 to 15 mm.

The eco-friendly stone paper according to claim 1, wherein the short fibers are cotton short fibers, and the resin is polyethylene or polypropylene.

The eco-friendly stone paper according to claim 2, wherein the cotton staple fiber is short cotton wool, and the resin is polyethylene.

The environmentally friendly stone paper according to any one of claims 1 to 3, wherein the weight percentage of the short fibers in the component is 30 to 50%, and the weight percentage of the resin is 47 to 67%.

5. The environmentally friendly stone paper according to claim 4, wherein: the component further comprises an auxiliary agent in a weight percentage of 2.2 to 4.5%, the auxiliary agent comprising a compounding agent selected from the group consisting of a composite coupling agent, a flame retardant, and a compatibilizing agent. One or more of a lotion and a slip agent.

6. The environmentally friendly stone paper according to claim 1, wherein: the component does not include calcium carbonate.

An environmentally friendly stone paper comprising a surface layer and a base layer, wherein: the composition of the base layer is the same as the composition of the environmentally friendly stone paper according to any one of claims 1 to 6, and the composition of the surface layer is The percentage by mass of the surface layer includes 32-64% of titanium dioxide, 33-65% of resin, and 2.2 to 4.5% of auxiliary agent.

8. The environmentally friendly stone paper according to claim 7, wherein: the resin in the surface layer and the base layer is polyethylene, wherein the high density polyethylene accounts for 55-65%, and the low density polyethylene accounts for 25-35%, linear. Low density polyethylene accounts for 5-15%.

The environmentally friendly stone paper according to claim 7 or 8, wherein: the surface layer is two, and the base layer is sandwiched between two surface layers, and the thickness of the base layer accounts for 70% of the total thickness of the environmentally friendly stone paper. 90%, the thickness of each of the surface layers accounts for 5%-15% of the total thickness of the environmentally friendly stone paper.

10. A method for preparing an environmentally friendly stone paper, comprising the steps of:

A. The components are dried to a moisture content of less than 2%, the components being as described in any one of claims 7-9;

D. The surface layer and the base layer particles are co-extruded through three layers to prepare an environmentally friendly stone paper having a surface layer-base layer-surface layer three-layer structure.

The preparation method according to claim 10, wherein in the step B, When the additive is added, the auxiliary agent is added in the order of adding a composite coupling agent, a flame retardant, a compatibilizer, a slip agent, and each of the additives is thoroughly mixed and then added to the other.

The preparation method according to claim 10 or 11, wherein in the step D, a three-layer co-extrusion five-roll calender is used, which comprises an extruder portion and a calender portion, the extrusion The extrusion temperature of each section of the machine is set to 90-110 °C, 220-240 °C, 100-120 °C, and the temperature of the calender is set to less than 150 °C.