A modifier, an unsaturated polyester resin cured product, a preparation method thereof, and an application thereof on the cover of an image capturing device

Abstract

The present invention discloses a modifier for toughening unsaturated polyester resin, characterized in that: the modifier is a polyether ester multi-block copolymer composed of an aliphatic polyether block and an aliphatic polyester block. The present invention also discloses an unsaturated polyester resin cured product using the above modifier, a preparation method of the unsaturated polyester resin cured product, and its application on the cover of an image capturing device. Compared with the prior art, the modifier of the present invention can improve the toughness, impact strength and tensile strength of the unsaturated polyester resin cured product.

Description

Technical Field

[0001] The present invention relates to the technical field of unsaturated resins, and specifically refers to a modifier for toughening unsaturated polyester resins, a cured product of unsaturated polyester resins, a preparation method thereof, and an application thereof on the cover of an image capturing device. Background Art

[0002] With the rapid development of digital technology and network technology, concepts such as the Internet of Everything, Smart City, and Safe City have been successively proposed and implemented. As the "eyes" of terminal image capturing devices - such as cameras and monitors - their importance has become increasingly prominent. Terminal image capturing devices are placed in various corners of cities, communities, gardens, factories, and rivers to collect real-time images of these areas, providing image data for various sectors of society. These data are used for monitoring natural disasters, factory operations, natural resources, etc., providing a reference basis for the safety of all aspects of society. It can be said that the clarity of the images it captures determines the safety level of a certain area to a certain extent.

[0003] For the cover of an image capturing device, the cover body is generally made of thermosetting resins such as unsaturated polyester resins. In order to improve the mechanical properties of the cover body and better protect the internal modules of the image capturing device, the thermosetting resin can be toughened.

[0004] Currently, the toughening of unsaturated polyester resins can generally be divided into the following categories: One is to synthesize new unsaturated polyester resins by changing the chemical composition, mainly by introducing flexible chain segments. However, the cost of toughening and modification by this method is relatively high, and it is also difficult to meet the diverse requirements in practical applications; the second is to carry out toughening modification by adding inorganic nanoparticles. However, due to their high surface energy and surface activity, it is difficult to uniformly disperse them in polymers, and it is difficult to achieve an ideal toughening effect; the third is to utilize thermoplastic resins and unsaturated polyesters to form an interpenetrating network or semi-interpenetrating network structure to produce a synergistic effect to improve the toughness of the material; the fourth is to introduce elastomers (such as rubber) to uniformly disperse them in the matrix of unsaturated polyester resins to form microphase separation to improve the toughness of unsaturated polyester resins. However, the above two methods may have problems such as poor compatibility, unstable particle size, poor transparency, and a decrease in properties such as strength.

[0005] Block copolymers can combine the excellent properties of multiple polymers to obtain functional polymer materials with superior properties. By designing the molecular structure of block copolymers, the compatibility with unsaturated polyester resins and the toughening and strengthening effects can be taken into account. In addition, by adjusting the composition and structure of block copolymers, the morphology of microphase separation can be regulated, which plays an important role in the toughening modification of unsaturated polyester resins.

[0006] As disclosed in CN101072828A, a kind of epoxy vinyl ester and unsaturated polyester resin toughened by an amphiphilic block copolymer is provided. The ester resin toughening agent used is an amphiphilic block copolymer containing at least one ester resin miscible block and at least one ester resin immiscible block, and the toughness of the cured product of the unsaturated polyester resin toughened thereby is improved. However, this invention mainly focuses on the toughening effect of the all-polyether block copolymer in the unsaturated polyester resin, and mainly includes diblock and triblock copolymers. Compared with diblock and triblock copolymers, multiblock copolymers usually have better mechanical properties and a more abundant microphase separation structure. Therefore, adding them into the unsaturated polyester resin will produce a better toughening and strengthening effect.

[0007] Based on the above analysis, it is urgent to develop a multiblock copolymer as a toughening modifier for unsaturated polyester resin to be applied to the toughening of unsaturated polyester resin and realize the improvement of its toughness, tensile strength and impact strength. Summary of the Invention

[0008] The first technical problem to be solved by the present invention is, in view of the current situation of the prior art, to provide a modifier for toughening unsaturated polyester resin that can improve the toughness, impact strength and tensile strength of the cured product of unsaturated polyester resin.

[0009] The second technical problem to be solved by the present invention is to provide a cured product of unsaturated polyester resin with enhanced toughness, impact strength and tensile strength.

[0010] The third technical problem to be solved by the present invention is to provide a preparation method of the above-mentioned cured product of unsaturated polyester resin.

[0011] The fourth technical problem to be solved by the present invention is to provide an application of the above-mentioned cured product of unsaturated polyester resin on the cover of an image capturing device.

[0012] The technical solution adopted by the present invention to solve the first technical problem is: a modifier for toughening unsaturated polyester resin, characterized in that: the modifier is a polyether ester multiblock copolymer composed of an aliphatic polyether block and an aliphatic polyester block, and the general formula of the polyether ester multiblock copolymer is:

[0013] ;

[0014] wherein, a is any integer from 2 to 6;

[0015] b is any integer from 2 to 11;

[0016] c is any integer from 2 to 4;

[0017] d is any integer from 13 to 68;

[0018] e and f are respectively determined by the contents of the aliphatic polyester block and the aliphatic polyether block;

[0019] The number-average molecular weight of the polyether ester multi-block copolymer is 8,000 to 50,000 grams per mole.

[0020] Preferably, the content of the aliphatic polyether block is 30 to 85 wt%, the content of the aliphatic polyester block is 15 to 70 wt%, and the sum of the contents of the aliphatic polyether block and the aliphatic polyester block is 100 wt%.

[0021] Preferably, the aliphatic polyester block is at least one of polyethylene glycol adipate, polybutylene succinate, and polyethylene glycol tridecanedioate.

[0022] Preferably, the value of c is 2 or 4. When c is 2, the aliphatic polyether block is polyethylene oxide, and when c is 4, the aliphatic polyether block is polytetrahydrofuran. The number-average molecular weight of the above polyethylene oxide or polytetrahydrofuran is 600 to 3,000 grams per mole.

[0023] The technical solution adopted by the present invention to solve the second technical problem is: an unsaturated polyester resin cured product using the above-mentioned modifier, which is characterized in that its raw materials include: unsaturated polyester resin, initiator, and modifier.

[0024] Preferably, the mass ratio of the unsaturated polyester resin to the modifier is 100:1 to 10:1.

[0025] Preferably, the mass ratio of the unsaturated polyester resin to the initiator is 200:1 to 40:1.

[0026] Preferably, the unsaturated polyester resin is an orthophthalic unsaturated polyester resin.

[0027] Preferably, the initiator is an organic peroxide.

[0028] Furthermore, the initiator is at least one of di-tert-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, benzoyl peroxide, and tert-butyl peroxybenzoate.

[0029] The technical solution adopted by the present invention to solve the third technical problem is: a preparation method of the above-mentioned unsaturated polyester resin cured product, which is characterized by including the following steps: mixing the unsaturated polyester resin and the modifier, heating to 70 to 110 °C, stirring for 10 minutes to 2 hours, mixing evenly, and standing to room temperature; adding the initiator to the mixture, and curing after mixing evenly to obtain the required unsaturated polyester resin cured product.

[0030] The technical solution adopted by the present invention to solve the fourth technical problem is as follows: an application of the above-mentioned unsaturated polyester resin cured product on the cover of an image capturing device.

[0031] Preferably, the cover of the image capturing device includes

[0032] a cover body, made of the above-mentioned unsaturated polyester resin cured product, hollow inside and having an opening at the rear side, and mounting holes on the front side wall of the cover body; and

[0033] a transparent panel, installed in the mounting holes of the cover body.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] (1) The modifier for toughening unsaturated polyester resin proposed by the present invention is a polyether ester multi-block copolymer composed of an aliphatic polyether block and an aliphatic polyester block. On the one hand, the aliphatic polyether block has good compatibility with the unsaturated polyester resin matrix, providing good flexibility and impact strength. Therefore, the modifier of the present invention can be well dissolved in the unsaturated polyester resin matrix and uniformly dispersed. On the other hand, during the curing process, the polyether ester multi-block copolymer can undergo microphase separation, and a small amount of the polyether ester multi-block copolymer can achieve the toughening effect.

[0036] (2) After the modifier of the present invention is added to the unsaturated polyester resin matrix, due to the microphase separation generated in the system, the energy dissipation path is improved, and the toughness, impact strength and tensile strength of the unsaturated polyester resin cured product are all significantly improved. Description of the Drawings

[0037] Figure 1 It is the stress-strain curve of the unsaturated polyester resin cured product obtained in Example 1 of the present invention;

[0038] Figure 2 It is the stress-strain curve of the unsaturated polyester resin cured product obtained in Example 7 of the present invention;

[0039] Figure 3 It is the stress-strain curve of the unsaturated polyester resin cured product obtained in Example 9 of the present invention;

[0040] Figure 4 It is the stress-strain curve of the unsaturated polyester resin cured product obtained in Example 10 of the present invention;

[0041] Figure 5 It is the stress-strain curve of the unsaturated polyester resin cured product obtained in Comparative Example 1 of the present invention;

[0042] Figure 6Schematic three-dimensional structure diagram of the cover in the embodiment of the image capturing device of the present invention;

[0043] Figure 7 is Figure 6 Schematic three-dimensional structure diagram in another direction in;

[0044] Figure 8 is Figure 6 Schematic three-dimensional structure diagram of the cover body in. Detailed implementation mode

[0045] The present invention will be further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0046] Unless otherwise specified, the experimental methods used in the following embodiments are all conventional methods, and the materials, reagents, etc. used, unless otherwise specified, can all be obtained from commercial channels.

[0047] In the following embodiments and comparative examples of the present invention, the unsaturated polyester resin is an orthophthalic unsaturated polyester resin (manufactured by Jinling Lilinsi Resin Co., Ltd., trade name Palapreg P17-902). Example 1:

[0048] The modifier used in this example is a polyether ester multi-block copolymer mBCP-1 composed of polyethylene glycol terephthalate (PEB) and polyethylene oxide (PEO, molecular weight 2000 g / mol); among them, the polyether ester multi-block copolymer mBCP-1 is prepared by mixing musk T (10.0 g), polyethylene glycol (20.0 g, molecular weight 2000 g / mol) and 15.0 μL tetrabutyl titanate, purging with nitrogen, and mechanically stirring at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-1, the polyester block is polyethylene glycol terephthalate (PEB), with a content of 22%; the polyether block is polyethylene oxide (PEO), with a content of 78%, and the molecular weight of mBCP-1 is 18.7 kg / mol;

[0049] 50.0 g of unsaturated polyester resin is mixed with 1.5 g of mBCP-1, heated to 100 °C, stirred for 40 minutes, mixed evenly, and left to stand at room temperature; 0.5 g of tert-butyl peroxybenzoate is mixed with it, and after mixing evenly, it is cured at 110 °C for 40 minutes, and cured at 120 °C and 140 °C for 20 minutes in turn to obtain an unsaturated polyester resin cured product UPR-1. Example 2:

[0050] This example uses the same modifier as in Example 1, with the only difference being that 50.0 g of unsaturated polyester resin is mixed with 0.5 g of mBCP-1, heated to 100 °C, stirred for 20 minutes until evenly mixed, and left to stand until room temperature; 0.5 g of tert-butyl peroxybenzoate is mixed with it, and after being evenly mixed, it is cured at 110 °C for 40 minutes, and then cured at 120 °C and 140 °C for 20 minutes in sequence to obtain an unsaturated polyester resin cured product UPR-2. Example 3:

[0051] This example uses the same modifier as in Example 1, with the only difference being that 50.0 g of unsaturated polyester resin is mixed with 2.5 g of mBCP-1, heated to 100 °C, stirred for 1 hour until evenly mixed, and left to stand until room temperature; 0.5 g of tert-butyl peroxybenzoate is mixed with it, and after being evenly mixed, it is cured at 110 °C for 40 minutes, and then cured at 120 °C and 140 °C for 20 minutes in sequence to obtain an unsaturated polyester resin cured product UPR-3. Example 4:

[0052] The modifier used in this example is a polyether ester multiblock copolymer mBCP-2 composed of polyethylene glycol terephthalate (PEB) and polyethylene oxide (PEO, with a molecular weight of 2000 g / mol); among them, the polyether ester multiblock copolymer mBCP-2 is prepared by mixing musk T (10.0 g), polyethylene glycol (20.0 g, with a molecular weight of 2000 g / mol) and 15.0 μL of tetrabutyl titanate, passing nitrogen, and mechanically stirring at 220 °C for 180 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-2, the polyester block is polyethylene glycol terephthalate (PEB) with a content of 23%; the polyether block is polyethylene oxide (PEO) with a content of 77%, and the molecular weight of mBCP-2 is 35.1 kg / mol;

[0053] 50.0 g of unsaturated polyester resin is mixed with 1.5 g of mBCP-2, heated to 110 °C, stirred for 40 minutes until evenly mixed, and left to stand until room temperature; 0.5 g of tert-butyl peroxybenzoate is mixed with it, and after being evenly mixed, it is cured at 110 °C for 40 minutes, and then cured at 120 °C and 140 °C for 20 minutes in sequence to obtain an unsaturated polyester resin cured product UPR-4. Example 5:

[0054] The modifier used in this example is a polyether ester multiblock copolymer mBCP-3 composed of polyethylene glycol terephthalate (PEB) and polyethylene oxide (PEO, with a molecular weight of 2000 grams per mole); among them, the polyether ester multiblock copolymer mBCP-3 is prepared by mixing musk T (15.0 g), polyethylene glycol (15.0 g, with a molecular weight of 2000 g / mol), and 15.0 μL of tetrabutyl titanate, purging with nitrogen, mechanically stirring, and reacting at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-3, the polyester block is polyethylene glycol terephthalate (PEB), with a content of 42%; the polyether block is polyethylene oxide (PEO), with a content of 58%, and the molecular weight of mBCP-3 is 11.7 kg / mol;

[0055] The preparation process of the unsaturated polyester resin cured product is the same as that in Example 1, the only difference is that the modifier mBCP-3 of equal mass is used to replace the modifier mBCP-1 to obtain the unsaturated polyester resin cured product UPR-5. Example 6:

[0056] The modifier used in this example is a polyether ester multiblock copolymer mBCP-4 composed of polyethylene adipate (PEA) and polyethylene oxide (PEO, with a molecular weight of 3000 grams per mole); among them, the polyether ester multiblock copolymer mBCP-4 is prepared by mixing cyclic oligomeric polyethylene adipate (10.0 g), polyethylene glycol (20.0 g, with a molecular weight of 3000 g / mol), and 15.0 μL of tetrabutyl titanate, purging with nitrogen, mechanically stirring, and reacting at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-4, the polyester block is polyethylene adipate (PEA), with a content of 21%; the polyether block is polyethylene oxide (PEO), with a content of 79%, and the molecular weight of mBCP-4 is 10.6 kg / mol;

[0057] The preparation process of the unsaturated polyester resin cured product is the same as that in Example 1, the only difference is that the modifier mBCP-4 of equal mass is used to replace the modifier mBCP-1 to obtain the unsaturated polyester resin cured product UPR-6. Example 7:

[0058] The modifier used in this example is a polyether ester multiblock copolymer mBCP-5 composed of polyethylene glycol terephthalate (PEB) and polyethylene oxide (PEO, with a molecular weight of 600 g / mol); among them, the polyether ester multiblock copolymer mBCP-5 is prepared by mixing musk T (15.0 g), polyethylene glycol (15.0 g, with a molecular weight of 600 g / mol) and 15.0 μL of tetrabutyl titanate, purging with nitrogen, and mechanically stirring at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-5, the polyester block is polyethylene glycol terephthalate (PEB) with a content of 58%; the polyether block is polyethylene oxide (PEO) with a content of 42%, and the molecular weight of mBCP-5 is 10.6 kg / mol;

[0059] The preparation process of the unsaturated polyester resin cured product is the same as that in Example 1, except that the modifier mBCP-5 of equal mass is used to replace the modifier mBCP-1, and the unsaturated polyester resin cured product UPR-7 is obtained. Example 8:

[0060] The modifier used in this example is a polyether ester multiblock copolymer mBCP-6 composed of polybutylene succinate (PBS) and polyethylene oxide (PEO, with a molecular weight of 2000 g / mol); among them, the polyether ester multiblock copolymer mBCP-6 is prepared by mixing cyclic oligomeric polybutylene succinate (10.0 g), polyethylene glycol (20.0 g, with a molecular weight of 2000 g / mol) and 15.0 μL of tetrabutyl titanate, purging with nitrogen, and mechanically stirring at 220 °C for 180 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-6, the polyester block is polybutylene succinate (PBS) with a content of 33%; the polyether block is polyethylene oxide (PEO) with a content of 67%, and the molecular weight of mBCP-6 is 40.7 kg / mol;

[0061] The preparation process of the unsaturated polyester resin cured product is the same as that in Example 1, except that the modifier mBCP-6 of equal mass is used to replace the modifier mBCP-1, and 1.0 g of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane is used to replace 0.5 g of tert-butyl peroxybenzoate, and the unsaturated polyester resin cured product UPR-8 is obtained. Example 9:

[0062] The modifier used in this example is a polyether ester multi-block copolymer mBCP-7 composed of poly(butylene succinate) (PBS) and poly(ethylene oxide) (PEO, with a molecular weight of 2000 g / mol); among them, the polyether ester multi-block copolymer mBCP-7 is prepared by mixing cyclic oligomeric butylene succinate (10.0 g), polyethylene glycol (30.0 g, with a molecular weight of 2000 g / mol) and 15.0 μL of tetrabutyl titanate, purging with nitrogen, mechanically stirring, and reacting at 220 °C for 180 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-7, the polyester block is poly(butylene succinate) (PBS) with a content of 25%; the polyether block is poly(ethylene oxide) (PEO) with a content of 75%, and the molecular weight of mBCP-7 is 45.7 kg / mol;

[0063] The preparation process of the unsaturated polyester resin cured product is the same as that in Example 1, the only difference is that the modifier mBCP-7 of equal mass is used to replace the modifier mBCP-1 to obtain the unsaturated polyester resin cured product UPR-9.

[0064] Example 10:

[0065] The modifier used in this example is a polyether ester multi-block copolymer mBCP-8 composed of poly(ethylene glycol tridecanedioate) (PEB) and poly(tetrahydrofuran) (PTMO, with a molecular weight of 1000 g / mol); among them, the polyether ester multi-block copolymer mBCP-8 is prepared by mixing musk T (15.0 g), polytetrahydrofuran diol (15.0 g, with a molecular weight of 1000 g / mol) and 15.0 μL of tetrabutyl titanate, purging with nitrogen, mechanically stirring, and reacting at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-8, the polyester block is poly(ethylene glycol tridecanedioate) (PEB) with a content of 44%; the polyether block is poly(tetrahydrofuran) (PTMO) with a content of 56%, and the molecular weight of mBCP-8 is 14.2 kg / mol;

[0066] The preparation process of the unsaturated polyester resin cured product is the same as that in Example 4, the only difference is that the modifier mBCP-8 of equal mass is used to replace the modifier mBCP-2 to obtain the unsaturated polyester resin cured product UPR-10.

[0067] Example 11:

[0068] The modifier used in this example is a polyether ester multi-block copolymer mBCP-9 composed of polyethylene glycol terephthalate (PEB) and polytetrahydrofuran (PTMO, with a molecular weight of 2900 grams per mole); among them, the polyether ester multi-block copolymer mBCP-9 is prepared by mixing musk T (10.0 g), polytetrahydrofuran diol (20.0 g, with a molecular weight of 2900 g / mol) and 15.0 μL of tetrabutyl titanate, purging with nitrogen, mechanically stirring, and reacting at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-9, the polyester block is polyethylene glycol terephthalate (PEB), with a content of 28%; the polyether block is polytetrahydrofuran (PTMO), with a content of 72%, and the molecular weight of mBCP-9 is 11.5 kg / mol;

[0069] Mix 50.0 grams of unsaturated polyester resin with 1.5 grams of mBCP-9, heat up to 110 °C, stir for 1 hour, mix evenly, and let it stand to room temperature; mix 0.5 gram of tert-butyl peroxybenzoate with it, after mixing evenly, cure at 110 °C for 40 minutes, and cure at 120 °C and 140 °C for 20 minutes in sequence to obtain an unsaturated polyester resin cured product UPR-11.

[0070] Comparative Example 1:

[0071] Mix 50.0 grams of unsaturated polyester resin with 0.5 gram of tert-butyl peroxybenzoate, after mixing evenly, cure at 110 °C for 40 minutes, and cure at 120 °C and 140 °C for 20 minutes in sequence to obtain an unsaturated polyester resin cured product UPR.

[0072] Comparative Example 2:

[0073] The modifier used in this comparative example is a polyether ester multi-block copolymer mBCP-10 composed of polyethylene glycol terephthalate (PET) and polytetrahydrofuran (PTMO, with a molecular weight of 2000 grams per mole); among them, the polyether ester multi-block copolymer mBCP-10 is prepared by mixing cyclic oligomeric polyethylene glycol terephthalate (10.0 g), polytetrahydrofuran diol (20.0 g, with a molecular weight of 2000 g / mol) and 15.0 μL of tetrabutyl titanate, purging with nitrogen, mechanically stirring, and reacting at 220 °C for 60 min; quantitative nuclear magnetic resonance hydrogen spectrum test is carried out on mBCP-10, the polyester block is polyethylene glycol terephthalate (PEB), with a content of 33%; the polyether block is polytetrahydrofuran (PTMO), with a content of 67%;

[0074] Mix 50.0 grams of unsaturated polyester resin with 1.5 grams of mBCP-10, heat up to 110 °C, stir for 2 hours, mBCP-10 is incompatible with the unsaturated polyester resin, so it is difficult to toughen and modify the unsaturated polyester resin.

[0075] The performance test steps are as follows:

[0076] (1) Tensile property test: Use an Instron-3365 universal material testing machine to test the tensile properties of the unsaturated polyester resin cured product (tensile rate: 10 mm per minute, temperature: 20.0 °C, humidity: 70.0%);

[0077] (2) Impact resistance test: Use an FPP-01A impact testing machine to test the notched Izod impact properties of the unsaturated polyester resin cured product.

[0078] The impact toughness and tensile strength of the unsaturated polyester resin cured products obtained in all the above examples and Comparative Example 1 are shown in Table 1 (impact strength is used to characterize the toughness of the unsaturated polyester resin cured product). The stress-strain curves of the unsaturated polyester resin cured products obtained in Example 1, Example 7, Example 9, Example 10, and Comparative Example 1 are respectively as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0079] Table 1

[0080]

[0081] It can be seen from Table 1 and Figures 1 to 5 that: After adding the modifier of the present invention, the toughness and strength of the unsaturated polyester resin cured product are both significantly improved. The impact resistance strength can be increased by more than 90%, the strength can be increased by more than 30%, and the elongation at break is increased from less than 2% to about 4%.

[0082] The above unsaturated polyester resin cured product can be applied to the cover of an image capturing device.

[0083] As Figures 6 to 8 shown, it is a preferred embodiment of the image capturing device of the present invention. The image capturing device can be a camera, a monitor, etc. The cover of the above image capturing device includes a cover body 1 and a transparent panel 2.

[0084] Among them, the cover body 1 is made of the above unsaturated polyester resin cured product. The cover body 1 is generally in the shape of a cuboid, hollow inside and having an opening at the rear side. An installation hole 11 is provided on the front side wall of the cover body 1. The installation hole 11 is a stepped hole and has a stepped surface 111 facing the rear side.

[0085] The transparent panel 2 is installed in the installation hole 11 of the cover body 1, and the front edge of the transparent panel 2 is closely attached to the stepped surface 111 to prevent foreign impurities from entering.

Claims

1. An unsaturated polyester resin cured product, characterized in that: The raw materials include: unsaturated polyester resin, initiator and modifier for toughening unsaturated polyester resin, the modifier is a polyether ester multi-block copolymer composed of aliphatic polyether block and aliphatic polyester block, and the general formula of the polyether ester multi-block copolymer is: ； Wherein, a is any integer from 2 to 6; b is any integer between 2 and 11; c is any integer from 2 to 4; d is any integer between 13 and 68; e and f are determined by the contents of aliphatic polyester block and aliphatic polyether block, respectively; The number average molecular weight of the polyetherester multi-block copolymer is 8000-50000 grams per mole; The content of the aliphatic polyether block is 30-85 wt %, the content of the aliphatic polyester block is 15-70 wt %, and the sum of the contents of the aliphatic polyether block and the aliphatic polyester block is 100 wt %; The mass ratio of the unsaturated polyester resin to the modifier is 100:1 to 10:1; The mass ratio of the unsaturated polyester resin to the initiator is 200:1 to 40:

1.

2. The unsaturated polyester resin cured product according to claim 1, characterized in that: The aliphatic polyester block is at least one of polyethylene adipate, polybutylene succinate and polyethylene tridecanoate.

3. The unsaturated polyester resin cured product according to claim 1, characterized in that: The value of c is 2 or 4.

4. The unsaturated polyester resin cured product according to claim 1, characterized in that: The unsaturated polyester resin is an orthophthalic unsaturated polyester resin; The initiator is an organic peroxide.

5. A method for preparing the unsaturated polyester resin cured product according to any one of claims 1 to 4, characterized in that The method comprises the following steps: mixing unsaturated polyester resin and modifier, heating to 70-110°C, stirring for 10 minutes-2 hours, mixing evenly, and standing to room temperature; adding initiator to the mixture, mixing evenly, and curing to obtain the desired unsaturated polyester resin cured product.

6. Use of the cured unsaturated polyester resin according to any one of claims 1 to 4 on a cover of an image capturing device.

7. The use according to claim 6, characterized in that: The image capture device mask includes The cover body (1) is made of the unsaturated polyester resin solidified material, is hollow inside and has an opening at the rear, and has a mounting hole (11) on the front side wall of the cover body (1); and A transparent panel (2) is installed in the installation hole (11) of the cover body (1).

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