Ultralight water material and preparation method thereof

Abstract

The present invention discloses an ultralight water material, which is a foamed plate or sheet comprising at least 0.1-5wt% of a solid particle additive. The ultralight water material provided by the present invention not only has a suitable low density, but also can maintain good mechanical properties, and can greatly reduce the water absorption rate of the material, thereby achieving an ultra-long service life of the water material, and can further prevent corrosion and softening of the water material during use.

Description

Technical Field

[0001] The invention relates to the field of waterborne materials, and in particular to an ultralight waterborne material and a preparation method thereof. Background Art

[0002] Foaming material is a new type of material. With the continuous development of science and technology, foaming is becoming more and more perfect. Foaming materials are widely used in aerospace, transportation, building materials, plastic products, daily necessities and other fields due to their excellent low density and mechanical properties. Waterborne materials match the low density and mechanical properties of foaming materials, so they have become the key application areas of low-density foaming materials in recent years. However, in this field, waterproof and water-resistant properties have always been a problem for foaming materials.

[0003] The prior art (CN107234840A) provides a waterproof and corrosion-resistant polyurethane foam material, which effectively improves the corrosion resistance and waterproofness of the polyurethane foam material itself by adding a corrosion-resistant layer. However, under the premise that the base material still has pores, the above solution still cannot effectively form complete waterproof performance.

[0004] Therefore, in order to solve the above problems, the present application provides an ultra-light water material and a preparation method thereof, which can achieve complete waterproof and anti-hygroscopic properties while maintaining excellent strength. Summary of the invention

[0005] In order to solve the above problems, the first aspect of the present invention provides an ultralight water material, wherein the ultralight water material is a foamed board or sheet comprising at least 0.1 to 5 wt % of a solid particle additive.

[0006] As a preferred solution, the addition amount of the solid particle additive is 0.5-1 wt%.

[0007] As a preferred solution, the average particle size of the solid particle additive is 3000-3500 mesh.

[0008] As a preferred solution, the average particle size of the solid particle additive is 3200 mesh.

[0009] In the present application, montmorillonite of a specific particle size is used as a solid additive material, which effectively improves the overall mechanical properties while also enabling the closed-pore effect of multiple aperture sites to be online, thereby greatly reducing the water absorption rate of the material. The applicant believes that the presence of montmorillonite can not only be used as a solid particle connection system inside, and as a supporting site for supporting under external force, but can also be used as a plugging agent for pores in the present application, filling in the pores, and the pore size after filling can still maintain a good stress dispersion effect, but due to the presence of montmorillonite and its own waterproof effect, the pores can completely form a super-hydrophobic surface when in use, while preventing the slow penetration of water through the pores on the surface of the material, thereby having a strong moisture absorption resistance effect.

[0010] As a preferred solution, the solid particle additive is at least one of zinc oxide, montmorillonite, bentonite, titanium dioxide, calcium carbonate, white carbon black, and talc.

[0011] As a preferred solution, the solid particle additive is montmorillonite and / or bentonite.

[0012] As a preferred solution, the solid particle additive is montmorillonite.

[0013] As a preferred solution, the ultra-light water material also includes at least a polymer resin as a foaming substrate, and the polymer resin is at least one of PP, PE, POE, OBC, PC, and TPU.

[0014] As a preferred solution, the density of the foamed board or foamed sheet is 15 to 60 kg / m 3 .

[0015] As a preferred solution, the density of the foamed board or foamed sheet is 20 to 50 kg / m 3 .

[0016] As a preferred solution, the polymer resin is PE, and the PE is a mixture of LDPE and LLDPE.

[0017] As a preferred solution, the mass ratio of LDPE to LLDPE is 1-3:1-3.

[0018] As a preferred solution, the mass ratio of the LDPE to the LLDPE is 1:1.

[0019] In the present application, by adopting a mixed polymer matrix of LDPE and LLDPE, not only the low-density performance of the overall foaming material is ensured, but also the overall hardness and other mechanical properties of the foaming material can be improved in coordination with the solid particle additive of the composition. The applicant believes that: when the mass ratio of LDPE and LLDPE is 1:1, the mixture of LDPE and LLDPE can coordinate the system matrix to a stable and appropriate density, and can also form a smaller system pore size in the matrix material system compared to when each is used alone, and produce more pore sites. The generation of these large number of pore sites can effectively help the system disperse stress to all directions when the system is subjected to external force, and convert it into a silver streak state, so as to ensure that the system can still improve the upper limit of the system's tolerance to external stress at low density.

[0020] In the present application, when the mass ratio of LDPE to LLDPE is 1:1, montmorillonite with an average particle size of 3000-3500 mesh can be added to form an excellent blocking structure, thereby forming an overall closed pore to prevent water penetration. Otherwise, the excessively large montmorillonite particle size cannot cooperate with the pores formed by the system, but instead causes the formation of larger pores or a decrease in the closed porosity.

[0021] The second aspect of the present invention provides a method for preparing the above-mentioned ultra-light water material, which comprises the following steps: (1) heating the polymer resin and the solid particle additive to melt, mix and stir, and then extrude through a sheet extruder; (2) placing the extruded material into an autoclave, introducing a foaming fluid medium, controlling the pressure and temperature for infiltration, and after infiltration for a certain period of time, releasing the pressure and taking out the product.

[0022] As a preferred solution, the foaming fluid medium is N2 and CO2; the pressure is 15-60 MPa.

[0023] As a preferred solution, the foaming fluid medium is N2; and the pressure is 35-45 MPa.

[0024] As a preferred solution, the temperature is 120-160°C.

[0025] As a preferred solution, the temperature is 130-140°C.

[0026] As a preferred solution, the infiltration time is 2 to 8 hours.

[0027] As a preferred solution, the infiltration time is 5 to 6 hours.

[0028] As a preferred solution, the infiltration time is 6 hours and the pressure release time is 30 seconds.

[0029] In this application, the foaming effect of the foaming material is effectively improved by controlling the parameters and fluid medium in the foaming preparation method, and further expansion of the pores is avoided, thereby reducing the moisture absorption resistance. When the foaming fluid medium is selected as N2 and CO2, the liquid state can better infiltrate the foaming collection in the kettle, and can form a better foaming effect in the foaming stage under the blocking of montmorillonite, avoiding the leakage of the fluid medium during the foaming process, thereby performing uniform foaming and obtaining a foamed sheet with uniform foaming and small foaming pores.

[0030] Beneficial effects:

[0031] 1. The present application provides an ultra-low-density and ultra-lightweight water material, which not only has a suitable low density, but also can maintain good mechanical properties, and can greatly reduce the water absorption rate of the material, thereby achieving an ultra-long service life of the water material, and can further prevent corrosion and softening of the water material during use.

[0032] 2. The present application provides an ultra-light water material, which uses PE as a foaming base material. When the mass ratio of LDPE and LLDPE is 1:1, the mixture of LDPE and LLDPE can coordinate the system matrix to a stable and appropriate density, and can also form a smaller system pore size in the matrix material system compared to when each of them is used alone, thereby generating more pore sites and effectively maintaining the overall mechanical properties of the material.

[0033] 3. The present application provides an ultra-light water material, which uses montmorillonite of a specific particle size as a solid additive material, effectively improving the overall mechanical properties while also achieving a closed-pore effect at multiple pore sites, thereby greatly reducing the water absorption rate of the material. The presence of montmorillonite can not only serve as a solid particle connection system inside, but also as a supporting site for support under external force. In the present application, it can also act as a pore plugging agent and fill the pores. The filled pores can still maintain a good stress dispersion effect. However, due to the presence of montmorillonite and its own waterproof effect, the pores can completely form a super-hydrophobic surface during use, while preventing water from slowly penetrating through the pores on the material surface.

[0034] 4. The present application provides an ultra-light water material. When the mass ratio of LDPE to LLDPE is 1:1, montmorillonite with an average particle size of 3000-3500 mesh can be added to form an excellent plugging structure, thereby forming an overall closed pore to prevent water penetration. Otherwise, the excessively large montmorillonite particle size cannot cooperate with the pores formed by the system, but instead causes the formation of larger pores or a decrease in the closed porosity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A physical picture of the ultralight water material prepared for this application.

[0036] Figure 2 This is a picture of the finished product of water sports equipment made using the ultra-light water sports material prepared by this application. DETAILED DESCRIPTION

[0037] Example 1

[0038] Embodiment 1 The first aspect provides an ultralight water material, the ingredients of which include 0.5wt% of a solid particle additive and 99.5wt% of a polymer resin.

[0039] The solid particle additive is montmorillonite, and the average particle size is 3200 meshes.

[0040] The polymer resin is a mixture of LDPE and LLDPE, with a mass ratio of LDPE to LLDPE of 1:1; the average density of the ultralight water material is 48kg / m 3 , LDPE and LLDPE were purchased from the corresponding products sold by Sabic.

[0041] The second aspect of this embodiment provides a method for preparing the above-mentioned ultra-light water material, which comprises the following steps: (1) heating the polymer resin and the solid particle additive to 110°C, melting and mixing, and then extruding through a sheet extruder, wherein the thickness of the extruded sheet is 13 mm; placing the extruded material into an autoclave, introducing a foaming fluid medium, controlling the pressure and temperature for infiltration, and after infiltration for a certain period of time, releasing the pressure and taking out the product.

[0042] The foaming fluid medium is N2, the pressure is 40MPa, the temperature is 130°C, the infiltration time is 6 hours, and the pressure release time is 30 seconds.

[0043] Example 2

[0044] The specific implementation of this embodiment is the same as that of Embodiment 1, except that the foaming fluid medium is N2, the pressure is 35 MPa, the temperature is 135°C, the immersion time is 5.5 hours, and the pressure release time is 35 seconds.

[0045] Comparative Example 1

[0046] The specific implementation of this comparative example is the same as that of Example 1, except that the mass ratio of LDPE to LLDPE is 2:0.5.

[0047] Comparative Example 2

[0048] The specific implementation of this comparative example is the same as that of Example 1, except that the average particle size of the solid particle additive is 2000 mesh.

[0049] Comparative Example 3

[0050] The specific implementation of this comparative example is the same as that of Example 1, except that the foaming fluid medium is N2, the pressure is 40 MPa, the temperature is 135°C, the immersion time is 3 hours, and the pressure release time is 60 seconds.

[0051] Performance Evaluation

[0052] Density test: 10 samples were tested for each example and comparative example to measure the density of the materials obtained in the examples and comparative examples. A digital density tester was used as the testing instrument. The average value of the measured values ​​was recorded in Table 1.

[0053] Table 1

[0054] Example <![CDATA[Density kg / m 3 > Hardness C Water absorption % Example 1 48 50 0 Example 2 48 49 0.001 Comparative Example 1 55 48 0.01 Comparative Example 2 54 35 0.015 Comparative Example 3 57 32 0.011

[0055] It can be seen from Examples 1 to 2, Comparative Examples 1 to 3 and Table 1 that the ultra-light water material provided by the present invention not only has a suitable low density, but also can maintain good mechanical properties, and can greatly reduce the water absorption rate of the material, thereby achieving an ultra-long service life of the water material, and can further prevent corrosion and softening of the water material during use. The ultra-light water material is suitable for promotion in the field of water materials and has broad development prospects.

Claims

1. An ultralight water material, characterized in that: The ultralight water material is a foamed board or sheet containing at least 0.1 to 5 wt% of a solid particle additive; The solid particle additive is montmorillonite, and the average particle size of the solid particle additive is 3000-3500 mesh; The ultralight water material further comprises at least a polymer resin as a foaming substrate, wherein the polymer resin is PE, and the PE is a mixture of LDPE and LLDPE, and the mass ratio of the LDPE to the LLDPE is 1-3:1-3; the preparation method of the ultralight water material comprises the following steps: (1) heating the polymer resin and the solid particle additive to melt, mix and stir, and then extrude the polymer resin and the solid particle additive through a sheet extruder; (2) placing the extruded material into an autoclave, introducing a foaming fluid medium, controlling the pressure and temperature for infiltration, and after infiltration for a certain period of time, releasing the pressure to take out the product, thereby obtaining the ultralight water material; The foaming fluid medium is N2; the pressure is 35-45MPa; The temperature is 130-140°C; The infiltration time is 6 hours, and the pressure release time is 30 seconds.

2. The ultralight water material according to claim 1, characterized in that: The density of the foamed board or sheet is 15 to 60 kg / m 3 .

3. A method for preparing the ultralight waterborne material according to claim 1, characterized in that: The steps include: (1) heating the polymer resin and the solid particle additive to melt, mix and stir, and then extrude through a sheet extruder; (2) placing the extruded material into an autoclave, introducing a foaming fluid medium, controlling the pressure and temperature for infiltration, and after infiltration for a certain period of time, releasing the pressure and taking out the product.

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