A low water absorption, toughened nylon sheet

Abstract

The application discloses a low-water-absorption and toughened nylon sheet, which is formed into a sheet with an A-B-C-B-A structure through co-extrusion; wherein the A layer structure comprises nylon material, PVB / lithium silicate composite material and POE modified particles; the B layer structure comprises nylon material, PVB / lithium silicate composite material and mixed glass fiber; and the C layer structure comprises nylon material and POE modified particles. The nylon sheet is designed into an A-B-C-B-A structure, and the compounded components are optimized and improved in the A layer, the B layer and the C layer, so that the prepared nylon sheet not only has an extremely low water absorption (water absorption < 0.5%), a water bubble hardness change < 3, but also has excellent toughness and wear resistance, and the initial hardness is 80-85 HD. Based on the nylon sheet, a plastic scraper is prepared, and the service life of the plastic scraper is increased by 4-5 times compared with that of the existing commercially available plastic scraper.

Description

Technical Field

[0001] This invention belongs to the field of nylon material technology, and particularly relates to a toughened nylon sheet with low water absorption. Background Technology

[0002] Nylon is currently the most widely used engineering plastic, with single-6 and double-6 being the most common types. Nylon possesses excellent impact resistance, abrasion resistance, fatigue resistance, corrosion resistance, low coefficient of friction, high strength, and high toughness, making it widely used in the automotive, textile, medical, and sporting industries. However, nylon's tendency to absorb water leads to instability in its mechanical and rigid properties, limiting its lifespan and hindering its further application in many scenarios. To reduce the water absorption rate of nylon, manufacturers employ methods such as adding water-blocking additives (e.g., montmorillonite, nano-titanium dioxide); blending with low-absorbency polymers (e.g., with polyolefins, polystyrene); and surface coating modification (e.g., applying hydrophobic coatings to the nylon surface, surface modification grafting with hydrophobic materials), enabling nylon materials to achieve further development in various industries.

[0003] However, nylon materials used in the printing industry require both a certain degree of toughness and abrasion resistance, as well as extremely low water absorption (less than 0.5%), and traditional modification methods (blending, surface modification) can no longer meet these requirements.

[0004] Based on this, we are now studying a new type of nylon sheet with low water absorption and simultaneously increased toughness. Summary of the Invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a nylon sheet with extremely low water absorption and excellent toughness.

[0006] Technical solution: The present invention relates to a low-water-absorption toughened nylon sheet, wherein the nylon sheet has been formed into an ABCBA structure through co-extrusion; wherein,

[0007] The A-layer structure includes nylon material with a mass ratio of 100:(10-15):(3-8), PVB / lithium silicate composite material, and POE modified particles;

[0008] The B-layer structure comprises nylon material with a mass ratio of 100:(5-10):(1-3), PVB / lithium silicate composite material, and mixed glass fiber;

[0009] The C-layer structure comprises nylon material with a mass ratio of 100:(5-10) and POE modified particles;

[0010] The PVB / lithium silicate composite material comprises lithium silicate and PVB in a mass ratio of 1:(0.3-0.8).

[0011] This invention employs a co-extrusion process to construct nylon sheets with an ABCBA structure. In both the A and B layers, a PVB / lithium silicate composite material is incorporated into the nylon material. This PVB / lithium silicate composite material utilizes the properties of PVB and lithium silicate; during preparation, PVB is grafted onto lithium silicate. Based on the self-film-forming properties of lithium silicate, the water-resistant properties of the prepared A and B layer nylon materials are improved. This allows the formation of inorganic sheet-like barriers within the material to prevent water molecules in the air from penetrating through the surface, thereby reducing the material's water absorption rate. Furthermore, the hydroxyl groups of PVB... In addition, lithium silicate can react with the amide bonds of nylon materials in the extruder to form hydrogen bonds (i.e., the hydroxyl groups of PVB react with the amide bonds of nylon materials in the extruder to form hydrogen bonds) or covalent bonds (i.e., the silicon-oxygen bonds in lithium silicate may react with the carbonyl or amino groups in the amide bonds during the co-extrusion reaction to form silicon-oxygen-carbon bonds (Si-OC) or silicon-nitrogen bonds (Si-N) covalent bonds). This occupies most of the amide bonds in the nylon material, inhibiting the reaction between the hydroxyl groups of water molecules in the air and the amide bonds in the nylon material, thereby greatly reducing the water absorption rate of the nylon material and improving the service life of the material.

[0012] Furthermore, by compounding mixed glass fibers in the B-layer structural material, the present invention enhances the hardness and improves the mechanical properties of the prepared nylon material by using glass fibers of different lengths. On the other hand, the hydroxyl groups of silica, the main component of the glass fibers, can also react with the amide bonds of the nylon material in the extruder to form hydrogen bonds, thereby further inhibiting the reaction between the hydroxyl groups of water molecules in the air and the amide bonds in the nylon material.

[0013] Furthermore, the PVB / lithium silicate composite material used in this invention is prepared by the following steps: dissolving lithium silicate in distilled water, adding PVB powder, silane coupling agent, cationic surfactant and citric acid, then adding 3-5 times the mass of ethanol to the PVB powder, mixing in a sealed container at 80-90°C for 30-45 minutes, and drying in a vacuum oven to remove moisture, thus obtaining the lithium silicate / PVB composite material.

[0014] Preferably, the silane coupling agent may include γ-aminopropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, or γ-methacryloyloxypropyltrimethoxysilane, added in an amount of 1-3% of the total mass of PVB and lithium silicate. The cationic surfactant may be hexadecyltrimethylammonium bromide or hexadecyltrimethylammonium chloride, added in an amount of 0.5-1% of the total mass of PVB and lithium silicate. Citric acid is added in an amount of 0.1-0.3% of the total mass of PVB and lithium silicate.

[0015] Furthermore, the POE modified particles used in this invention include POE-g-MAH modified resin, phenolic materials, and initiators in a mass ratio of 90:(14-18):(0.5-1).

[0016] This invention improves POE-g-MAH modified resin, which has toughening properties, using phenolic materials. The macromolecular free radicals on POE can be grafted onto the phenolic hydroxyl groups of the phenolic material. Furthermore, the anhydride of MAH can undergo esterification with the phenolic hydroxyl groups, resulting in a mixture of ions with strong bonding. Furthermore, the introduction of phenolic materials further enhances the toughness of the nylon material. The hydroxyl groups of the phenolic materials react with the amide bonds in the material, occupying most of the amide bonds and inhibiting the reaction between the hydroxyl groups of water molecules in the air and the amide bonds in the nylon material. This significantly reduces the water absorption rate of the nylon material and extends its service life.

[0017] Furthermore, the POE modified particles used in this invention include at least two of the following phenolic materials: phenol, nonylphenol, arylalkylphenol, cashew phenol, octylphenol, or bisphenol A. The initiators include dicumyl peroxide, benzoyl peroxide, lauroyl peroxide, potassium persulfate, or sodium persulfate.

[0018] Furthermore, the mixed glass fiber used in this invention comprises 500nm, 10um, and 3um glass fibers in a mass ratio of (2-3):(2-3):1.

[0019] Furthermore, the POE modified particles used in this invention are prepared by the following steps: POE-g-MAH modified resin, phenolic materials and initiator are mixed, drawn into fibers and washed under the conditions of 230-250℃ and 150-200rpm extruder speed, and then pelletized to obtain particles.

[0020] Furthermore, the A, B, and C layers of the nylon sheet of the present invention each contain 0.3-0.5% antioxidant by weight, which includes 2,6-tributyl-4-methylphenol, bis(3,5-tributyl-4-hydroxyphenyl) sulfide, or pentaerythritol tetrakis[β-(3,5-tributyl-4-hydroxyphenyl)propionate].

[0021] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are: the nylon sheet is designed with an ABCBA structure, and the compound components in layers A, B and C are optimized and improved to form a layer-by-layer protection. As a result, the nylon sheet prepared not only has an extremely low water absorption rate (water absorption rate <0.5%) and a water hardness change of <3, but also has excellent toughness with an initial hardness of 80-85HD. The plastic scraper prepared based on this nylon sheet has a machine test life that is 4-5 times longer than that of commercially available plastic scrapers. Attached Figure Description

[0022] Figure 1 This is a product image of the nylon sheet prepared in Example 1 of the present invention. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the embodiments.

[0024] It should be noted that all raw materials used in this invention are commercially available. Among them, POE-g-MAH modified resin is a well-known raw material in the art and can be directly purchased from commercial sources, such as Jia Yi Rong Polymer (Shanghai) Co., Ltd.

[0025] For the ABCBA structure sheet formed by the present invention, a five-layer co-extrusion die (ABCBA) structure composite sheet is constructed using a method known in the art. This involves melting and plasticizing different materials through three independent extruders, then combining them into a single die via a distribution block to form a five-layer film or sheet. The present invention can be used to prepare POE modified particles and the nylon sheet at 230-250°C and 150-200 rpm extruder speeds. The preparation process can be achieved within this range, and the specific process parameters can be flexibly adjusted during actual production.

[0026] Furthermore, the mixed glass fibers used in the B-layer structural material of this invention may include glass fibers of 500 nm, 10 μm, and 3 μm in a mass ratio of (2-3):(2-3):1. In the following embodiments, a combination of glass fibers of 500 nm, 10 μm, and 3 μm in a mass ratio of 2:2:1 is used.

[0027] In the embodiments of the present invention described below, the nylon material used in different layers A, B, and C is kept in the same amount. There is no limitation on the thickness of each layer; maintaining the overall thickness between 1.3 and 2.0 mm is sufficient. For example, the thickness of each layer can be kept the same, and the total amount of each layer can be determined by the overall thickness requirement.

[0028] Example 1

[0029] The PVB / lithium silicate composite material used in Example 1 was prepared by the following steps: Lithium silicate was dissolved in excess distilled water, PVB powder, γ-aminopropyltriethoxysilane, hexadecyltrimethylammonium bromide, and citric acid were added, followed by the addition of ethanol at a mass equivalent to 4 times that of the PVB powder. The mixture was stirred and mixed in a sealed container at 85°C for 40 minutes, and then dried in a vacuum oven to remove moisture, thus obtaining the lithium silicate / PVB composite material. The mass ratio of lithium silicate to PVB was 1:0.5; the amount of γ-aminopropyltriethoxysilane added accounted for 2% of the total mass of PVB and lithium silicate; the amount of hexadecyltrimethylammonium bromide added accounted for 0.8% of the total mass of PVB and lithium silicate; and the amount of citric acid added accounted for 0.2% of the total mass of PVB and lithium silicate.

[0030] The POE modified particles used in Example 1 were prepared by the following steps: POE-g-MAH modified resin was mixed with bisphenol A, phenol and initiator dicumyl peroxide in a ratio of 90:9:7:0.8, and the mixture was drawn into fibers and washed under the conditions of extruder speed of 150-200 rpm at 230-250℃, and then granulated to obtain particles.

[0031] The A-layer structure material of this embodiment 1 includes PA66, PVB / lithium silicate composite material and POE modified particles in a mass ratio of 100:12:5, and 2,6-tertiary butyl-4-methylphenol accounting for 0.4% of the total mass of PA66, PVB / lithium silicate composite material and POE modified particles.

[0032] The B-layer structural material of this embodiment 1 includes PA66, PVB / lithium silicate composite material and mixed glass fiber in a mass ratio of 100:8:2, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66, PVB / lithium silicate composite material and mixed glass fiber.

[0033] The C-layer structure material of this embodiment 1 includes PA66 and POE modified particles in a mass ratio of 100:8, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66 and POE modified particles.

[0034] In this embodiment 1, the nylon sheet is formed by melting and plasticizing the A-layer material, the B-layer material and the C-layer material through three independent extruders, and then combining them into a mold at an extrusion temperature of 260-285℃ and an extruder speed of 200-300rpm to form a five-layer sheet with a thickness of 1.3-2.0mm.

[0035] Example 2

[0036] The PVB / lithium silicate composite material used in Example 2 was prepared by the following steps: Lithium silicate was dissolved in excess water, PVB powder, γ-aminopropyltriethoxysilane, hexadecyltrimethylammonium bromide, and citric acid were added, followed by the addition of ethanol at a mass equivalent to 4 times the mass of the PVB powder. The mixture was stirred in a sealed container at 85°C for 40 minutes, and then dried in a vacuum oven to remove moisture, thus obtaining the lithium silicate / PVB composite material. The mass ratio of lithium silicate to PVB was 1:0.4; the amount of γ-aminopropyltriethoxysilane added accounted for 2% of the total mass of PVB and lithium silicate; the amount of hexadecyltrimethylammonium bromide added accounted for 0.8% of the total mass of PVB and lithium silicate; and the amount of citric acid added accounted for 0.2% of the total mass of PVB and lithium silicate.

[0037] The POE modified particles used in Example 2 were prepared by the following steps: POE-g-MAH modified resin was mixed with bisphenol A, phenol and initiator dicumyl peroxide in a ratio of 90:10:7:0.6, and the mixture was drawn into fibers at an extruder speed of 150-200 rpm and then granulated after being washed with water to obtain particles.

[0038] The A-layer structure material of this embodiment 2 includes PA66, PVB / lithium silicate composite material and POE modified particles in a mass ratio of 100:14:6, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66, PVB / lithium silicate composite material and POE modified particles.

[0039] The B-layer structural material of this embodiment 2 includes PA66, PVB / lithium silicate composite material and mixed glass fiber in a mass ratio of 100:6:2, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66, PVB / lithium silicate composite material and mixed glass fiber.

[0040] The C-layer structure material of this embodiment 2 includes PA66 and POE modified particles in a mass ratio of 100:6, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66 and POE modified particles.

[0041] In this embodiment 2, the nylon sheet is formed by melting and plasticizing the A-layer material, the B-layer material and the C-layer material through three independent extruders, and then combining them into a mold at an extrusion temperature of 260-285℃ and an extruder speed of 200-300rpm to form a five-layer structure sheet with a thickness of 1.3-2.0mm.

[0042] Example 3

[0043] The PVB / lithium silicate composite material used in Example 3 was prepared by the following steps: Lithium silicate was dissolved in excess water, PVB powder, γ-aminopropyltriethoxysilane, hexadecyltrimethylammonium bromide, and citric acid were added, followed by the addition of ethanol at a mass equivalent to 4 times the mass of the PVB powder. The mixture was stirred and mixed in a sealed container at 85°C for 40 minutes, and then dried in a vacuum oven to remove moisture, thus obtaining the lithium silicate / PVB composite material. The mass ratio of lithium silicate to PVB was 1:0.6; the amount of γ-aminopropyltriethoxysilane added accounted for 2% of the total mass of PVB and lithium silicate; the amount of hexadecyltrimethylammonium bromide added accounted for 0.8% of the total mass of PVB and lithium silicate; and the amount of citric acid added accounted for 0.2% of the total mass of PVB and lithium silicate.

[0044] The POE modified particles used in Example 3 were prepared by the following steps: POE-g-MAH modified resin was mixed with bisphenol A, phenol and initiator dicumyl peroxide in a ratio of 90:7:8:0.9, and the mixture was drawn into fibers and granulated by water under the conditions of extruder speed of 150-200 rpm at 230-250 ℃.

[0045] The A-layer structure material of this embodiment 3 includes PA66, PVB / lithium silicate composite material and POE modified particles in a mass ratio of 100:13:7, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66, PVB / lithium silicate composite material and POE modified particles.

[0046] The B-layer structure material of this embodiment 3 includes PA66, PVB / lithium silicate composite material and mixed glass fiber in a mass ratio of 100:7:2, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66, PVB / lithium silicate composite material and mixed glass fiber.

[0047] The C-layer structure material of this embodiment 3 includes PA66 and POE modified particles in a mass ratio of 100:7, and 2,6-tert-butyl-4-methylphenol accounting for 0.4% of the total mass of PA66 and POE modified particles.

[0048] In this embodiment 3, the nylon sheet is formed by melting and plasticizing the A-layer material, the B-layer material and the C-layer material through three independent extruders, and then combining them into a mold at an extrusion temperature of 260-285℃ and an extruder speed of 200-300rpm to form a five-layer sheet with a thickness of 1.3-2.0mm.

[0049] Example 4

[0050] The PVB / lithium silicate composite material used in Example 4 was prepared by the following steps: Lithium silicate was dissolved in excess water, PVB powder, γ-aminopropyltriethoxysilane, hexadecyltrimethylammonium bromide, and citric acid were added, followed by the addition of ethanol at a mass ratio of 3 times that of the PVB powder. The mixture was stirred and mixed in a sealed container at 80°C for 45 minutes, and then dried in a vacuum oven to remove moisture, thus obtaining the lithium silicate / PVB composite material. The mass ratio of lithium silicate to PVB was 1:0.3; the amount of γ-aminopropyltriethoxysilane added was 1% of the total mass of PVB and lithium silicate; the amount of hexadecyltrimethylammonium bromide added was 0.5% of the total mass of PVB and lithium silicate; and the amount of citric acid added was 0.1% of the total mass of PVB and lithium silicate.

[0051] The POE modified particles used in Example 4 were prepared by the following steps: POE-g-MAH modified resin was mixed with bisphenol A, phenol and initiator dicumyl peroxide in a ratio of 90:7:7:0.5, and the mixture was drawn into fibers and granulated by water under the conditions of extruder speed of 150-200 rpm at 230-250 ℃.

[0052] The A-layer structure material of this embodiment 4 includes PA66, PVB / lithium silicate composite material and POE modified particles in a mass ratio of 100:10:3, and 2,6-tertiary butyl-4-methylphenol accounting for 0.3% of the total mass of PA66, PVB / lithium silicate composite material and POE modified particles.

[0053] The B-layer structural material of this embodiment 4 includes PA66, PVB / lithium silicate composite material and mixed glass fiber in a mass ratio of 100:5:1, and 2,6-tert-butyl-4-methylphenol accounting for 0.3% of the total mass of PA66, PVB / lithium silicate composite material and mixed glass fiber.

[0054] The C-layer structure material of this embodiment 4 includes PA66 and POE modified particles in a mass ratio of 100:5, and 2,6-tert-butyl-4-methylphenol accounting for 0.3% of the total mass of PA66 and POE modified particles.

[0055] In this embodiment 4, the nylon sheet is formed by melting and plasticizing the A-layer material, the B-layer material and the C-layer material through three independent extruders, and then combining them into a mold at an extrusion temperature of 260-285℃ and an extruder speed of 200-300rpm to form a five-layer structure sheet with a thickness of 1.3-2.0mm.

[0056] Example 5

[0057] The PVB / lithium silicate composite material used in Example 5 was prepared by the following steps: Lithium silicate was dissolved in excess distilled water, PVB powder, γ-aminopropyltriethoxysilane, hexadecyltrimethylammonium bromide, and citric acid were added, followed by the addition of ethanol at 5 times the mass of the PVB powder. The mixture was stirred and mixed in a sealed container at 90°C for 30 minutes, and then dried in a vacuum oven to remove moisture, thus obtaining the lithium silicate / PVB composite material. The mass ratio of lithium silicate to PVB was 1:0.8; the amount of γ-aminopropyltriethoxysilane added accounted for 3% of the total mass of PVB and lithium silicate; the amount of hexadecyltrimethylammonium bromide added accounted for 1% of the total mass of PVB and lithium silicate; and the amount of citric acid added accounted for 0.3% of the total mass of PVB and lithium silicate.

[0058] The POE modified particles used in Example 5 were prepared by the following steps: POE-g-MAH modified resin was mixed with bisphenol A, phenol and initiator dicumyl peroxide in a ratio of 90:9:9:1, and the mixture was drawn into fibers and granulated by water under the conditions of extruder speed of 150-200 rpm at 230-250 ℃.

[0059] The A-layer structure material of this embodiment 5 includes PA66, PVB / lithium silicate composite material and POE modified particles in a mass ratio of 100:15:8, and 2,6-tertiary butyl-4-methylphenol accounting for 0.5% of the total mass of PA66, PVB / lithium silicate composite material and POE modified particles.

[0060] The B-layer structural material of this embodiment 5 includes PA66, PVB / lithium silicate composite material and mixed glass fiber in a mass ratio of 100:10:3, and 2,6-tert-butyl-4-methylphenol accounting for 0.5% of the total mass of PA66, PVB / lithium silicate composite material and mixed glass fiber.

[0061] The C-layer structure material of this embodiment 5 includes PA66 and POE modified particles in a mass ratio of 100:10, and 2,6-tert-butyl-4-methylphenol accounting for 0.5% of the total mass of PA66 and POE modified particles.

[0062] In this embodiment 5, the nylon sheet is formed by melting and plasticizing the A-layer material, the B-layer material, and the C-layer material through three independent extruders, and then combining them into a mold at an extrusion temperature of 260-285℃ and an extruder speed of 200-300rpm to form a five-layer structure sheet with a thickness of 1.3-2.0mm.

[0063] Comparative Example 1

[0064] The basic steps are the same as in Example 1, except that only PVB is used to replace the PVB / lithium silicate composite material in the A-layer structural material, B-layer structural material and C-layer structure.

[0065] Comparative Example 2

[0066] The basic steps are the same as in Example 1, except that only POE-g-MAH modified resin is used to replace POE modified particles in the A-layer structural material, B-layer structural material and C-layer structure.

[0067] Performance testing

[0068] The nylon sheets prepared in Examples 1 to 5 of the present invention, as well as Comparative Examples 1 and 2, were subjected to water absorption tests, changes in hardness after soaking in water, and abrasion resistance tests. The results are shown in Table 1 below. For the water absorption test, the sheets were soaked in distilled water, and the weight and hardness before and after soaking were measured to calculate the moisture absorption rate.

[0069] Table 1 Performance testing of Examples 1 to 5, Comparative Example 1 and Comparative Example 2

[0070]

[0071] As shown in Table 1, the nylon sheet prepared by the present invention is designed with an ABCBA layer-by-layer protective structure, and the compound components in layers A, B and C are optimized and improved. As a result, the nylon sheet prepared by the present invention not only has an extremely low water absorption rate (water absorption rate <0.5%) and a water hardness change of <3, but also has excellent toughness and an initial hardness of 80-85HD.

[0072] In addition to the above embodiments, the technical effects claimed by the present invention can be achieved by using the components and contents defined in the present invention, as well as the specific substances of the components used. Therefore, no further experimental verification is required.

[0073] For example, silane coupling agents may also include γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, or γ-methacryloyloxypropyltrimethoxysilane. Cationic surfactants may also be hexadecyltrimethylammonium chloride. Phenolic materials may include at least two of phenol, nonylphenol, aralkylphenol, cashew phenol, octylphenol, or bisphenol A. Initiators may also include benzoyl peroxide, lauroyl peroxide, potassium persulfate, or sodium persulfate. Antioxidants may also include bis(3,5-tributyl-4-hydroxyphenyl) sulfide or pentaerythritol tetrakis[β-(3,5-tributyl-4-hydroxyphenyl)propionate].

Claims

1. A toughened nylon sheet with low water absorption, characterized in that, The nylon sheet is co-extruded to form an ABCBA structure; wherein... The A-layer structure includes nylon material with a mass ratio of 100:(10-15):(3-8), PVB / lithium silicate composite material, and POE modified particles; The B-layer structure includes nylon material with a mass ratio of 100:(5-10):(1-3), PVB / lithium silicate composite material, and mixed glass fibers of different lengths; The C-layer structure comprises nylon material with a mass ratio of 100:(5-10) and POE modified particles; The PVB / lithium silicate composite material comprises lithium silicate and PVB in a mass ratio of 1:(0.3-0.8); it is prepared by the following steps: dissolving lithium silicate in distilled water, adding PVB powder, silane coupling agent, cationic surfactant and citric acid, then adding 3-5 times the mass of ethanol to the PVB powder, mixing in a sealed container at 80-90℃ for 30-45 min, and drying in a vacuum oven to remove moisture, thus obtaining the PVB / lithium silicate composite material; The POE modified particles comprise POE-g-MAH modified resin, phenolic materials, and an initiator in a mass ratio of 90:(14-18):(0.5-1); the phenolic materials include phenol and bisphenol A; and the initiator is dicumyl peroxide.

2. The low water absorption toughened nylon sheet according to claim 1, characterized in that, The silane coupling agent includes γ-aminopropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, or γ-methacryloyloxypropyltrimethoxysilane, and is added in an amount of 1-3% of the total mass of PVB and lithium silicate.

3. The low-water-absorption toughened nylon sheet according to claim 1, characterized in that, The cationic surfactant is hexadecyltrimethylammonium bromide or hexadecyltrimethylammonium chloride, and its addition amount accounts for 0.5-1% of the total mass of PVB and lithium silicate.

4. The low-water-absorption toughened nylon sheet according to claim 1, characterized in that, The amount of citric acid added is 0.1-0.3% of the total mass of PVB and lithium silicate.

5. The low water absorption toughened nylon sheet according to claim 1, characterized in that, The POE modified particles are prepared by the following steps: POE-g-MAH modified resin, phenolic materials and initiator are mixed and drawn into fibers under the conditions of 230-250℃ and 150-200rpm extruder speed, then washed and pelletized to obtain particles.

6. The low water absorption toughened nylon sheet according to claim 1, characterized in that, The structural materials of layers A, B, and C also include antioxidants accounting for 0.3-0.5% of the total mass of each layer. These antioxidants include 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl) sulfide, or pentaerythritol tetrakis[β-(3,5-tert-butyl-4-hydroxyphenyl)propionate].

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