Compression-resistant low-dielectric rigid polyurethane foam plastic and preparation method thereof

Abstract

The invention discloses a kind of compression-resistant low-dielectric rigid polyurethane foam and preparation method thereof, the compression-resistant low-dielectric rigid polyurethane foam, it is prepared by weight by the following components:1000 parts of polytetrahydrofuran diols, 1400 1800 parts of aromatic polyisocyanates, 20 50 parts of catalysts, 400 1000 parts of acicular wollastonites, 50 100 parts of foaming agents, 15 30 parts of foaming stabilizers.The present invention is by adding polytetrahydrofuran diol and aromatic polyisocyanates in polyurethane foam, compared with common diols such as polyethylene glycol, polypropylene glycol, its compressive strength, dielectric constant are more excellent.In addition, the present invention is by selecting N, N bis (2 hydroxypropyl) anilines as catalyst and adding acicular wollastonites, also further improves the compressive strength and dielectric constant of material.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and particularly relates to a compression-resistant low-dielectric rigid polyurethane foam plastic and a preparation method thereof. Background Art

[0002] Polyurethane (PU), whose full name is polyurethane, is a polymer compound. It was first developed by Otto Bayer and others in 1937. Polyurethanes are classified into two main types: polyester and polyether. They can be made into polyurethane plastics (primarily foamed plastics), polyurethane fibers (known as spandex in China), polyurethane rubber, and elastomers. Among all types of polyurethane products, polyurethane foam is the most important. Its main characteristic is its porosity, resulting in a relatively low relative density and high specific strength. Depending on the raw materials used and the formulation, polyurethane foams can be made into soft, semi-rigid, and rigid types. Classified by the type of polyol used, they can be divided into polyester, polyether, and castor oil-based polyurethane foams. Classified by the foaming method, they can be classified into block, molded, and spray-on polyurethane foams.

[0003] Polyurethane rigid foams have excellent mechanical properties and are suitable for use in molded parts. However, conventional polyurethane rigid foams have a high dielectric constant and poor strength and impact resistance, limiting their application in emerging technology fields such as microelectronics. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a compression-resistant low-medium rigid polyurethane foam plastic and a preparation method thereof.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A compression-resistant low-dielectric rigid polyurethane foam plastic is prepared from the following components in parts by weight:

[0007]

[0008] As a preferred technical solution, wherein:

[0009] The molecular weight of the polytetrahydrofuran diol is 1000±50, and the hydroxyl number is 106.9-118.1 mgKOH / g.

[0010] The aromatic polyisocyanate is toluene diisocyanate.

[0011] The catalyst is N, N-bis (2-hydroxypropyl) aniline.

[0012] The aspect ratio of the needle-shaped wollastonite is 22-26.

[0013] The foaming agent is trichlorotrifluoroethane.

[0014] The foaming stabilizer is polysiloxane.

[0015] The present invention also provides a method for preparing the above-mentioned compression-resistant low-dielectric rigid polyurethane foam plastic, comprising the following steps:

[0016] 50-100 parts of a foaming agent, 15-30 parts of a foaming stabilizer, and 400-1000 parts of needle-shaped wollastonite are added to 1000 parts of polytetrahydrofuran diol by weight, and the mixture is uniformly mixed to obtain a mixture; 1400-1800 parts of a polyisocyanate compound and 20-50 parts of a catalyst are then added to the mixture, uniformly mixed, and poured into a mold at 70-90° C., and demolded after curing to obtain the target product.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The rigid polyurethane foam composition of the present invention contains polytetramethylene glycol and aromatic polyisocyanate, and has better compressive strength and dielectric constant than ordinary glycols such as polyethylene glycol and polypropylene glycol.

[0019] (2) The rigid polyurethane foam composition of the present invention contains a special catalyst N,N-bis(2-hydroxypropyl)aniline, which has better compressive strength and dielectric constant than the common catalysts triethylenediamine and triethanolamine.

[0020] (3) The rigid polyurethane foam composition of the present invention contains needle-shaped wollastonite, which has better compressive strength and dielectric constant than talc, calcium carbonate, and ordinary wollastonite. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the following embodiments. It should be understood that the embodiments described are only a portion of the present invention, not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0022] The material grades and suppliers in each embodiment and comparative example are as follows:

[0023] The molecular weight of polytetramethylene glycol is 1000±50, and the hydroxyl number (mgKOH / g) is 106.9-118.1. It is purchased from Jining Tangyi Chemical Co., Ltd.

[0024] The molecular weight of polypropylene glycol and polyethylene glycol were both 1000±50, and they were purchased from Jining Tangyi Chemical Co., Ltd.

[0025] Toluene diisocyanate, Jining Tangyi Chemical Co., Ltd.

[0026] N,N-Bis(2-hydroxypropyl)aniline, Hubei Shixing Chemical Co., Ltd.

[0027] Triethylenediamine and triethanolamine, Jinan Jibin Chemical Co., Ltd.

[0028] Trichlorotrifluoroethane, Shanghai Qi'an Chemical Co., Ltd.

[0029] The aspect ratio of needle-shaped wollastonite is 25, the mesh number is 1250 mesh, Weifang Kangzhuang Building Materials Co., Ltd.

[0030] Wollastonite has an aspect ratio of 15 and a mesh size of 800, from Weifang Kangzhuang Building Materials Co., Ltd.

[0031] The mesh size of talcum powder and calcium carbonate is 2000 mesh, Changxing Huayang Plastic Material Co., Ltd.

[0032] The above reagents are only used to illustrate the sources and components of the reagents used in the experiments of the present invention so as to fully disclose the information, and do not mean that the present invention cannot be achieved by using other similar reagents or reagents provided by other suppliers.

[0033] Example 1

[0034] A method for preparing compression-resistant low-dielectric rigid polyurethane foam plastics comprises the following steps:

[0035] 50 parts of trichlorotrifluoroethane, 15 parts of polysiloxane, and 400 parts of needle-shaped wollastonite are added to 1000 parts of polytetrahydrofuran diol by weight, and the mixture is mixed uniformly at 40° C. Then, 1400 parts of toluene diisocyanate and 20 parts of N,N-bis(2-hydroxypropyl)aniline are added to the mixture, mixed uniformly, and poured into a mold at 70° C. After aging, the product is demoulded to obtain the product.

[0036] Example 2

[0037] A method for preparing compression-resistant low-dielectric rigid polyurethane foam plastics comprises the following steps:

[0038] 60 parts of trifluorotrichloroethane, 20 parts of polysiloxane, and 600 parts of needle-shaped wollastonite are added to 1000 parts of polytetrahydrofuran diol by weight, and the mixture is mixed uniformly at 40°C to obtain a mixture; then 1500 parts of toluene diisocyanate and 30 parts of N,N-bis(2-hydroxypropyl)aniline are added to the above mixture, mixed uniformly, and poured into a mold at 80°C. After aging, the product is demoulded to obtain the product.

[0039] Example 3

[0040] A method for preparing compression-resistant low-dielectric rigid polyurethane foam plastics comprises the following steps:

[0041] 80 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 1000 parts of needle-shaped wollastonite are added to 1000 parts of polytetrahydrofuran diol by weight, and the mixture is mixed uniformly at 40° C. Then, 1600 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are added to the mixture, mixed uniformly, and poured into a mold at 90° C. After aging, the product is demoulded to obtain the product.

[0042] Example 4

[0043] A method for preparing compression-resistant low-dielectric rigid polyurethane foam plastics comprises the following steps:

[0044] 100 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 800 parts of needle-shaped wollastonite are added to 1000 parts of polytetrahydrofuran diol by weight, and the mixture is mixed uniformly at 40° C. Then, 1800 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are added to the mixture, mixed uniformly, and poured into a mold at 90° C. After aging, the product is demoulded to obtain the product.

[0045] Comparative Example 1

[0046] A method for preparing polyurethane foam plastics comprises the following steps:

[0047] 100 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 800 parts of needle-shaped wollastonite are added to 1000 parts of polypropylene glycol by weight, and the mixture is mixed uniformly at 40°C to obtain a mixture; then 1800 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are added to the above mixture, mixed uniformly, and poured into a mold at 90°C. After aging, the product is demolded to obtain the product.

[0048] Comparative Example 2

[0049] A method for preparing polyurethane foam plastics comprises the following steps:

[0050] 100 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 800 parts of needle-shaped wollastonite are added to 1000 parts of polyethylene glycol by weight, and the mixture is mixed uniformly at 40°C to obtain a mixture; then 1800 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are added to the above mixture, mixed uniformly, and poured into a mold at 90°C. After aging, the product is demolded to obtain the product.

[0051] Comparative Example 3

[0052] A method for preparing polyurethane foam plastics comprises the following steps:

[0053] 100 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 800 parts of needle-shaped wollastonite are added to 1000 parts of polytetramethylene glycol by weight, and the mixture is mixed uniformly at 40°C to obtain a mixture; then 1800 parts of toluene diisocyanate and 50 parts of triethylenediamine are added to the above mixture, mixed uniformly, and poured into a mold at 90°C. After aging, the product is demoulded to obtain the product.

[0054] Comparative Example 4

[0055] A method for preparing polyurethane foam plastics comprises the following steps:

[0056] 100 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 800 parts of needle-shaped wollastonite are added to 1000 parts of polytetramethylene glycol by weight, and the mixture is mixed uniformly at 40°C to obtain a mixture; then 1800 parts of toluene diisocyanate and 50 parts of triethanolamine are added to the above mixture, mixed uniformly, and poured into a mold at 90°C. After curing, the product is demoulded to obtain the product.

[0057] Comparative Example 5

[0058] A method for preparing polyurethane foam plastics comprises the following steps:

[0059] 100 parts of trichlorotrifluoroethane, 30 parts of polysiloxane, and 800 parts of talc are added to 1000 parts of polytetramethylene glycol by weight, and the mixture is mixed uniformly at 40° C.; 1800 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are then added to the mixture, mixed uniformly, and poured into a mold at 90° C., and the product is demoulded after aging to obtain the product.

[0060] Comparative Example 6

[0061] A method for preparing polyurethane foam plastics comprises the following steps:

[0062] 100 parts of trifluorotrichloroethane, 30 parts of polysiloxane, and 800 parts of calcium carbonate are added to 1000 parts of polytetramethylene glycol by weight, and the mixture is mixed uniformly at 40° C.; then 1800 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are added to the mixture, mixed uniformly, and poured into a mold at 90° C., and demolded after aging to obtain a product.

[0063] Comparative Example 7

[0064] A method for preparing polyurethane foam plastics comprises the following steps:

[0065] 100 parts of trichlorotrifluoroethane, 30 parts of polysiloxane, and 800 parts of wollastonite are added by weight to 1000 parts of polytetrahydrofuran diol, and the mixture is mixed uniformly at 40° C. Then, 1800 parts of toluene diisocyanate and 50 parts of N,N-bis(2-hydroxypropyl)aniline are added to the mixture, mixed uniformly, and poured into a mold at 90° C., and demolded after aging to obtain the product.

[0066] The performance of the products obtained in the above embodiments and comparative examples was tested using the following method:

[0067] The compressive strength test specimen size is 15mm×10.4mm×30mm and is tested according to ASTM D695.

[0068] The dielectric constant test specimen has a size of 8 mm × 3.2 mm × 1.6 mm. Silver electrodes are evenly coated on the surface of the test specimen before the dielectric constant test is performed. The test is performed in accordance with GB / T 1409-2006 at a test frequency of 1 MHz.

[0069] The test results are shown in Table 1:

[0070] Table 1 Performance test results of the products obtained in each embodiment and comparative example

[0071]

[0072]

[0073] As can be seen from the above table, the rigid polyurethane foam composition of the present invention, to which polytetramethylene glycol and aromatic polyisocyanate are added, has better compressive strength and dielectric constant than ordinary glycols such as polyethylene glycol and polypropylene glycol.

[0074] The rigid polyurethane foam composition of the present invention is added with a special catalyst N,N-bis(2-hydroxypropyl)aniline. Compared with common catalysts triethylenediamine and triethanolamine, the rigid polyurethane foam composition has better compression strength and dielectric constant.

[0075] The rigid polyurethane foam composition of the present invention is added with needle-shaped wollastonite, and compared with talc, calcium carbonate and common wollastonite, the rigid polyurethane foam composition has better compression strength and dielectric constant.

[0076] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the embodiments described herein. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A compression-resistant low-dielectric rigid polyurethane foam plastic, characterized by: It is prepared from the following components by weight: The catalyst is N, N-bis (2-hydroxypropyl) aniline; The aspect ratio of the needle-shaped wollastonite is 22-26.

2. The compression-resistant low-dielectric rigid polyurethane foam according to claim 1, characterized in that: The molecular weight of the polytetrahydrofuran diol is 1000±50, and the hydroxyl number is 106.9-118.1 mgKOH / g.

3. The compression-resistant low-dielectric rigid polyurethane foam according to claim 1, characterized in that: The aromatic polyisocyanate is toluene diisocyanate.

4. The compression-resistant low-dielectric rigid polyurethane foam according to claim 1, characterized in that: The foaming agent is trichlorotrifluoroethane.

5. The compression-resistant low-dielectric rigid polyurethane foam according to claim 1, characterized in that: The foaming stabilizer is polysiloxane.

6. The method for preparing the compression-resistant low-dielectric rigid polyurethane foam according to any one of claims 1 to 5, characterized in that: The following steps are involved: 50-100 parts of a foaming agent, 15-30 parts of a foaming stabilizer, and 400-1000 parts of needle-shaped wollastonite are added to 1000 parts of polytetrahydrofuran diol by weight, and the mixture is mixed evenly to obtain a mixture. 1400-1800 parts of a polyisocyanate compound and 20-50 parts of a catalyst are then added to the mixture, mixed evenly, and poured into a mold at 70-90° C. The mixture is matured and demolded to obtain the target product.

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