Modified composite material type laminated wood for LNG (Liquefied Natural Gas) ship

Abstract

The utility model provides modified composite material type laminated wood for an LNG (liquefied natural gas) ship, the laminated wood comprises a polyurethane foaming layer, a glass fiber felt / glass fiber cloth and a microsphere filling material, n foaming holes are formed in the polyurethane foaming layer, the microsphere filling material is uniformly distributed in a polyurethane composite material, the number of the microsphere filling material is a, and n is a. The microsphere filling material and the polyurethane foaming layer are mixed to form a modified polyurethane composite layer, m layers of glass fiber felts / glass fiber fabrics are arranged, and the modified polyurethane composite layer is uniformly impregnated on the glass fiber felts / glass fiber fabrics to form the required polyurethane type composite material laminated wood; according to the modified composite material type laminated wood for the LNG ship, the laminated wood can keep high strength and high thermal insulation performance in an ultralow-temperature environment, the mechanical property of the laminated wood is improved, the preparation efficiency of the laminated wood can be improved by simplifying the preparation process, the supply cycle of the laminated wood is shortened, and the use requirements of users are met.

Description

Technical Field

[0001] The utility model relates to the technical field of thermosetting composite materials, in particular to a modified composite material type laminated wood for LNG ships. Background Art

[0002] Composite materials are made of two or more materials with different properties through special design and process combination. They not only maintain the advantages of each component material, but also complement the properties of each material through the composite process to obtain the optimal performance of the combined material. Among them, polyurethane composites are widely used in various fields such as shipbuilding and offshore engineering, aerospace, wind power, transportation, etc. due to their excellent mechanical properties, corrosion resistance, thermal insulation, etc.

[0003] For some special fields, such as LNG ships, LPG ships, and ultra-low temperature liquid cargo tank laminated wood, high requirements are placed on the thermal insulation / insulation properties and mechanical properties of laminated wood materials; at present, traditional ultra-low temperature liquid cargo tankers are generally made of beech wood, but due to limited forest resources, long-term felling will cause serious environmental problems, and the molding process of this type of laminated wood is relatively complicated, the production cycle is often long, and the supply cycle is relatively long. In addition, wooden materials are in harsh environments for a long time. If the products are not protected, they will cause moisture cracking; there will also be microbial erosion during use, resulting in mold and rot and other phenomena; at present, with the increasingly severe environmental protection situation, the supply cycle of high-quality wood is difficult to guarantee, and the shortage of laminated wood materials has restricted the development of domestic LNG ship technology. Therefore, it is of great significance to study how to improve the efficiency of preparing laminated wood and improve the quality of laminated wood.

[0004] Patent CN116604911A discloses a glass bead modified polyurethane composite profile, in which continuous glass fiber and continuous glass fiber mat are added to polyurethane, and the lightweight of the material is achieved by adding glass beads; however, the product prepared by the utility model is mainly used as a load-bearing material for subways and light rail lines, and the preparation process is relatively complicated. The continuous glass fiber mat and continuous glass fiber used have poor mechanical properties, which limits their application as high-strength pressure-bearing laminated wood; Patent CN116410617A discloses a method for preparing a surface-modified glass bead composite filler, in which the surface of the glass beads is modified to improve the interface bonding force between the polyurethane elastomer and the glass beads, thereby improving the performance of the thermoplastic polyurethane elastomer composite material, but the product prepared by the utility model has no fiber reinforcement, the product has poor mechanical properties, and it is difficult to meet the application needs of large-size products in special fields. Utility Model Content

[0005] In view of this, the utility model aims to propose a modified LNG ship composite material laminated wood to solve the problems of traditional laminated wood used in special fields in the prior art, which is prone to mildew and rot during use and has poor mechanical properties. Even if laminated wood imported from abroad is used, it still faces the problems of long laminated wood supply cycle and shortage of material sources; thereby achieving the goal of enabling laminated wood to maintain high strength and high thermal insulation performance in ultra-low temperature environment, improving the mechanical properties of laminated wood, avoiding the occurrence of mildew and rot during use, and improving the preparation efficiency of laminated wood.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] The utility model relates to a modified LNG ship composite material laminated wood, which comprises a polyurethane foam layer, a glass fiber felt / glass fiber cloth and a microsphere filling material. The polyurethane foam layer comprises n foaming holes, the microsphere filling material is evenly distributed in the polyurethane foam layer, the number of the microsphere filling material is a, n and a are both positive numbers, the microsphere filling material is mixed with the polyurethane foam layer to form a modified polyurethane composite layer, the glass fiber felt / glass fiber cloth is provided with m layers, m is a positive integer, the modified polyurethane composite layer is evenly impregnated on the glass fiber felt / glass fiber cloth to form the desired polyurethane composite laminated wood.

[0008] Furthermore, a≤n.

[0009] Furthermore, the matrix of the polyurethane foam layer is a polyurethane resin.

[0010] Furthermore, the glass fiber felt / glass fiber cloth is glass fiber mesh cloth / glass fiber biaxial composite felt.

[0011] Furthermore, the microsphere filling material is vacuum thin-walled hollow microspheres.

[0012] Further, the density of laminated wood is 900 kg / m3-1500 kg / m3.

[0013] Furthermore, the polyurethane foaming layer is composed of polyurethane resin polymer polyol, surfactant, foaming agent, catalyst and polymerized MDI.

[0014] Furthermore, the weight proportions of the components in the laminated wood are: 100 parts of polyurethane resin polymer polyol, 0.5-3 parts of surfactant, 0.1-0.5 parts of foaming agent, 0.1-2 parts of catalyst, 90-130 parts of polymerized MDI, 50-250 parts of glass fiber felt / glass fiber cloth, and 20-100 parts of microsphere filling material.

[0015] Furthermore, the density of the microsphere filling material is 0.1-0.5 g / cm3.

[0016] Furthermore, the surface density of the glass fiber mat / glass fiber cloth is 200-1200g / m2.

[0017] Compared with the prior art, the modified composite material laminated wood for LNG ships described in the utility model has the following beneficial effects:

[0018] The laminated wood can maintain high strength and high thermal insulation performance in an ultra-low temperature environment, i.e., -163°C, and can also improve the mechanical properties of the laminated wood to avoid the occurrence of mold and rot during use. In addition, the preparation process can be simplified to improve the preparation efficiency of the laminated wood, shorten the supply cycle of the laminated wood, meet the use needs of users, and also meet the use needs of LNG liquid cargo tanks. The thermal conductivity of the laminated wood can be reduced according to the needs of the liquid cargo tank, and the insulation performance of the laminated wood can be improved to achieve product lightweighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 The present invention is a schematic diagram of the process of preparing laminated wood;

[0021] Figure 2 Schematic diagram of the cross section of a laminated timber structure.

[0022] Explanation of the accompanying drawings: 1. polyurethane foam layer; 2. glass fiber felt / glass fiber cloth; 3. microsphere filling material; 4. modified polyurethane composite layer. DETAILED DESCRIPTION

[0023] The following will use the terms commonly used by those skilled in the art to convey the essence of their work to other technical personnel in the art to describe the utility model concepts of the present disclosure. However, these utility model concepts can be embodied in many different forms and should not be considered as limited to the embodiments described herein.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] In the prior art, for some special fields, such as LNG ships, LPG ships, and ultra-low temperature liquid cargo tank laminated wood, traditional laminated wood is made of beech wood. The large-scale use of beech wood is likely to cause a waste of forest resources, and its processing and preparation process is relatively complicated, which makes the production cycle and supply cycle of laminated wood longer. In addition, during long-term use, this type of laminated wood is prone to mildew and rot, which in turn affects the service life of the laminated wood on liquid cargo tankers in special fields. Due to the low mechanical properties of existing polyurethane composite materials, they cannot meet the application requirements of large-size products in special fields.

[0027] In order to solve the problems that traditional laminated wood is prone to mildew and rot during use and has poor mechanical properties, and that laminated wood imported from abroad faces long supply cycles and shortages of material sources; this embodiment proposes a modified LNG ship composite laminated wood, specifically a filler-modified polyurethane composite laminated wood and a preparation process thereof, wherein the modified LNG ship composite laminated wood comprises a polyurethane foam layer 1, glass fiber felt / glass fiber cloth 2 and a microsphere filling material 3, wherein the polyurethane foam layer 1 comprises n foaming holes, and the microsphere filling material 3 is uniformly distributed in the polyurethane foam layer 1, and the number of the microsphere filling material 3 is a, a≤n, and n and a are both positive. The microsphere filling material 3 is mixed with the polyurethane foam layer 1 to form a modified polyurethane composite layer 4, the glass fiber felt / glass fiber cloth 2 is provided with m layers, m is a positive integer, and the modified polyurethane composite layer 4 is evenly impregnated on the glass fiber felt / glass fiber cloth 2 to form the desired polyurethane composite laminated wood. The process greatly improves the mechanical properties of the laminated wood and reduces the thermal conductivity of the laminated wood. Among them, the matrix of the polyurethane foam layer 1 is polyurethane resin, the glass fiber felt / glass fiber cloth 2 and the microsphere filling material 3 are both reinforcing materials, and the prepared polyurethane composite laminated wood is a composite laminated wood with high load capacity and high thermal insulation; the density of the polyurethane composite laminated wood is 900kg / m3-1500 kg / m3, the fiber content of the polyurethane composite laminated wood is 30%-70%, the width of the product polyurethane composite laminated wood is 200-1000mm, the thickness of the product polyurethane composite laminated wood is 20-250mm, and the length of the product polyurethane composite laminated wood can be cut at will according to needs. In this embodiment, the glass fiber felt / glass fiber cloth 2 is glass fiber mesh cloth / glass fiber biaxial composite felt; the microsphere filling material 3 is a vacuum thin-walled hollow microsphere, which is used to reduce the thermal conductivity of the laminated wood.

[0028] By setting the laminated wood structural components, the tightness of the connection between the polyurethane foam layer 1 and the glass fiber felt / glass fiber cloth 2 can be improved, and the setting of the vacuum thin-walled microspheres can reduce the thermal conductivity of the laminated wood, so that the laminated wood can be applied to a larger temperature range of -163°C-50°C, that is, it has higher mechanical properties and thermal insulation properties.

[0029] The polyurethane foam layer 1 is composed of polyurethane resin polymer polyol, surfactant, foaming agent, catalyst and polymerized MDI. The weight proportions of the components in the laminated wood are as follows: 100 parts of polyurethane resin polymer polyol, 0.5-3 parts of surfactant, 0.1-0.5 parts of foaming agent, 0.1-2 parts of catalyst, 90-130 parts of polymerized MDI, 50-250 parts of glass fiber felt / glass fiber cloth 2, i.e. glass fiber mesh cloth / glass fiber biaxial composite felt, and 20-100 parts of microsphere filling material 3, i.e. vacuum thin-walled hollow microsphere; wherein the density of the microsphere filling material 3, i.e. vacuum thin-walled hollow microsphere, is 0.1-0.5 g / cm3, and the surface density of the glass fiber felt / glass fiber cloth 2 is 200-1200 g / m2; specifically, the glass fiber felt / glass fiber cloth 2, i.e. glass fiber mesh cloth / glass fiber biaxial composite felt, is a glass fiber mesh cloth or felt with a surface density of 200-1200 g / m2.

[0030] By setting the distribution ratio of each group in the laminated wood, the stability of the quality of the laminated wood can be achieved, the mechanical stability of the prepared laminated wood can be guaranteed, the mechanical properties of the laminated wood can be enhanced, the high thermal insulation performance of the laminated wood can be improved, and the thermal conductivity and insulation performance of the laminated wood can be changed according to the amount of microsphere filling material 3 added, thereby improving the flexibility of the thermal conductivity of the laminated wood and achieving lightweight products.

[0031] A method for preparing a modified composite material laminated wood for LNG ships, the method being used to prepare the modified composite material laminated wood for LNG ships, comprising the following steps:

[0032] Step 1: Calculate the number of layers of the glass fiber felt / glass fiber cloth 2 and the amount of the microsphere filling material 3 according to the required density of the laminated wood and the content of the glass fiber felt / glass fiber cloth 2;

[0033] Step 2, pretreatment: the number of layers of glass fiber felt / glass fiber cloth 2 is layered, and the required microsphere filling material 3 is uniformly mixed with the polyurethane foaming layer 1 to form a modified polyurethane composite layer 4. Specifically, the required microsphere filling material 3 is uniformly filled into the polyol combination material, wherein the polyol combination material is a white material, and the components of the white material are polyurethane resin polymer polyol, surfactant, foaming agent, catalyst, and polymerized MDI is a black material. The microsphere filling material 3 is first added to the white material and mixed evenly, and then the black material is added to foam to form a modified polyurethane composite layer 4;

[0034] Step S21: stratifying the number of layers of the glass fiber mat / glass fiber cloth 2 according to the calculation results;

[0035] Step S22: using a polyurethane injection machine to inject the polyol composite material with the microsphere filler 3 mixed with polymerized MDI into a heated mold at a preset flow rate, so that the polyurethane composite material is foamed in the heated mold to form a modified polyurethane composite layer 4;

[0036] Step 3: Mixing treatment: dipping the layered glass fiber felt / glass fiber cloth 2 into a heated mold filled with a modified polyurethane composite layer 4;

[0037] Step 4, heating and curing: by controlling the temperature of the heating mold, the composite layer 4 impregnated with the modified polyurethane and the glass fiber felt / glass fiber cloth 2 are heated and cured, that is, the glass fiber felt / glass fiber cloth 2 impregnated with the polyurethane resin is heated and cured to form the desired polyurethane composite laminated wood;

[0038] Step 5, demoulding and cutting: After the laminated wood is formed, the formed polyurethane composite laminated wood is cut and segmented according to the required size requirements at a sawing machine to obtain laminated wood of the required specifications.

[0039] A polyurethane composite material is prepared by using glass fiber felt / glass fiber cloth 2, i.e., glass fiber mesh cloth / biaxial glass fiber felt, with a certain surface density, and using vacuum thin-walled hollow microspheres as microsphere filling materials 3, which are fully mixed with the polyurethane composite material. Since the bulk density of the vacuum thin-walled hollow microspheres is less than the free bubble density of the polyurethane during foaming, under the same insulation conditions, the more vacuum thin-walled hollow microspheres are added, the greater the improvement in the thermal insulation performance of the product, and at the same time, the overall density of the material can be reduced, so that the laminated wood can be lightweight; but the added vacuum thin-walled hollow microspheres contain The more the amount, the higher the resin viscosity will be, thus causing the resin permeability to decrease. The more layers of glass fiber mesh cloth / biaxial glass fiber felt, the greater the mechanical properties will be, but the resin permeability will also decrease. By properly adjusting the mixing ratio of fiber, resin and thin-walled hollow microspheres, the uniform distribution of thin-walled hollow microspheres in the profile can be ensured. The polyurethane composite laminated wood prepared by the utility model has the characteristics of maintaining high mechanical strength and high thermal insulation performance at low temperatures, and has good punching, bonding and other processing properties similar to wood.

[0040] In addition, in actual application, according to the above-mentioned preparation method and the setting of the laminated wood structure, the following embodiment test is carried out, wherein the prepared laminated wood is a thin-walled hollow microsphere modified polyurethane rigid foam composite profile, including glass fiber felt / glass fiber cloth 2, namely glass fiber mesh cloth / biaxial glass fiber felt, polyurethane foaming layer 1, namely thermosetting polyurethane rigid foam material, microsphere filling material 3, namely thin-walled hollow microspheres, the thin-walled hollow microspheres are uniformly dispersed in the combination material of the thermosetting polyurethane rigid foam material, and the glass fiber mesh cloth / biaxial glass fiber felt is uniformly impregnated in the thermosetting polyurethane rigid foam material.

[0041] Embodiment 1:

[0042] The formula of component A of polyurethane resin: 100 parts of polyol resin, 10 parts of flame retardant, 2 parts of silicone oil, and 0.2 parts of composite catalyst, wherein silicone oil is used as a surfactant;

[0043] Polyurethane resin B component: 120 parts of polymerized MDI;

[0044] Reinforcement material: 70 layers of glass fiber mesh cloth with a surface density of 600g / m2, 40 parts of thin-walled hollow microspheres with a density of 0.2g / cm3, a total of about 200 parts;

[0045] The preparation process parameters of the thin-walled hollow microsphere modified polyurethane rigid foam composite profile are as follows: the size of the heated mold is set to 400×70mm, the molding speed is 0.4m / min, the glass fiber content is 55%, and the polyurethane injection machine can automatically calculate the resin flow of the polyurethane resin component A and the polyurethane resin component B; the heating mold temperature is set to 50-100℃, the curing time is 40-80min, and after curing, the mold is demolded and sawed to obtain a thin-walled hollow microsphere modified polyurethane rigid foam composite profile laminated wood with a density of 1540kg / m3.

[0046] Example 2

[0047] The formula of component A of polyurethane resin: 100 parts of polyol resin, 10 parts of flame retardant, 2 parts of silicone oil, and 0.2 parts of composite catalyst, wherein silicone oil is used as a surfactant;

[0048] Polyurethane resin B component: 120 parts of polymerized MDI;

[0049] Reinforcement material: 50 layers of glass fiber mesh cloth with a surface density of 600g / m2, 60 parts of thin-walled hollow microspheres with a density of 0.1g / cm3, a total of about 220 parts;

[0050] The preparation process parameters of the thin-walled hollow microsphere modified polyurethane rigid foam composite profile are as follows: the size of the heated mold is set to 400×70mm, the molding speed is 0.4m / min, the glass fiber content is 55%, and the polyurethane injection machine can automatically calculate the resin flow of the polyurethane resin component A and the polyurethane resin component B; the heating mold temperature is set to 50-100℃, the curing time is 40-80min, and after curing, the mold is demolded and sawed to obtain a thin-walled hollow microsphere modified polyurethane rigid foam composite profile laminated wood with a density of 1465kg / m3.

[0051] Example 3

[0052] The formula of component A of polyurethane resin: 100 parts of polyol resin, 10 parts of flame retardant, 2 parts of silicone oil, and 0.2 parts of composite catalyst, wherein silicone oil is used as a surfactant;

[0053] Polyurethane resin B component: 120 parts of polymerized MDI;

[0054] Reinforcement material: 50 layers of glass fiber mesh cloth with a surface density of 900g / m2, 100 parts of thin-walled hollow microspheres with a density of 0.1g / cm3, a total of about 260 parts;

[0055] The preparation process parameters of thin-walled hollow microsphere modified polyurethane rigid foam composite profile are as follows: set the heating mold size to 400×70mm, the molding speed to 0.4m / min, the glass fiber content to 55%, and the polyurethane glue injection machine can automatically calculate the resin flow of polyurethane resin component A and polyurethane resin component B; set the heating mold temperature to 50-100℃, the curing time to 40-80min, demolding and sawing after curing to obtain a thin-walled hollow microsphere modified polyurethane rigid foam composite profile laminated wood with a density of 1220kg / m3.

[0056] The main properties of the composite material profiles in the above Examples 1-3 were tested according to the corresponding international standards or national standards, and the test data are shown in Table 1 below.

[0057] Table 1 is the test data of the composite material profiles in the above examples 1-3

[0058]

[0059] Among them, the test standards in Table 1 are specifically as follows: the density is determined in accordance with GB / T 1463-2005 "Test method for density and relative density of fiber reinforced plastics", the compressive strength is determined in accordance with GB / T 1448-2005 "Test method for compression properties of fiber reinforced plastics" at -163°C; the interlaminar shear strength is determined in accordance with GB / T 1450.1 "Test method for interlaminar shear strength of fiber reinforced plastics" at -163°C; the thermal conductivity is determined in accordance with ISO 22007-4 "Determination of thermal conductivity and thermal diffusivity" at -163°C.

[0060] It can be seen from the comparative examples that the thin-walled hollow microsphere modified polyurethane rigid foam composite profile and the preparation process described in the present application have the following advantages: the thin-walled hollow microsphere modified polyurethane rigid foam composite profile uses thin-walled hollow microspheres and glass fiber mesh cloth / bi-axial glass fiber felt as reinforcing materials and polyurethane resin as a matrix, and has good thermal insulation effect and high mechanical strength at low temperatures. It can be used in fields with high requirements for thermal insulation and mechanical strength, thereby expanding its scope of application.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A modified composite laminated wood for LNG ships, characterized in that: The invention comprises a polyurethane foam layer (1), a glass fiber felt / glass fiber cloth (2) and a microsphere filling material (3), wherein the polyurethane foam layer (1) comprises n foaming holes, the microsphere filling material (3) is evenly distributed in the polyurethane foam layer (1), the number of the microsphere filling material (3) is a, and n and a are both positive numbers. The microsphere filling material (3) is mixed with the polyurethane foam layer (1) to form a modified polyurethane composite layer (4), the glass fiber felt / glass fiber cloth (2) is provided with m layers, and m is a positive integer. The modified polyurethane composite layer (4) is evenly impregnated on the glass fiber felt / glass fiber cloth (2), so as to form the desired polyurethane composite material laminated wood.

2. The modified composite laminated wood for LNG ships according to claim 1, characterized in that: Said a≤n.

3. The modified composite laminated wood for LNG ships according to claim 2, characterized in that: The matrix of the polyurethane foam layer (1) is polyurethane resin.

4. The modified composite laminated wood for LNG ships according to claim 2, characterized in that: The glass fiber felt / glass fiber cloth (2) is a glass fiber mesh cloth / glass fiber biaxial composite felt.

5. The modified composite laminated wood for LNG ships according to claim 2, characterized in that: The microsphere filling material (3) is vacuum thin-walled hollow microspheres.

6. The modified composite laminated wood for LNG ships according to claim 1, characterized in that: The density of the laminated wood is 900 kg / m3-1500 kg / m3.

7. The modified composite laminated wood for LNG ships according to claim 1, characterized in that: The density of the microsphere filling material (3) is 0.1-0.5 g / cm3.

8. The modified composite laminated wood for LNG ships according to claim 1, characterized in that: The surface density of the glass fiber felt / glass fiber cloth (2) is 200-1200g / m2.

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