Liquid crystal composition with negative dielectric anisotropy and its application

Abstract

The present invention discloses a liquid crystal composition with negative dielectric anisotropy and its application, wherein the liquid crystal composition with negative dielectric anisotropy comprises at least one compound represented by general formula I, at least one compound represented by general formula M, and at least one compound represented by general formula C. The present invention has the following beneficial effects: the liquid crystal composition containing a tetracyclic terminal olefin compound has a lower rotational viscosity, can achieve a fast response, and has a larger elastic constant, good low-temperature mutual solubility and moderate optical anisotropy, can adapt to different cell thickness designs, and obtain a good display effect.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a liquid crystal composition with negative dielectric anisotropy and applications thereof. Background Art

[0002] Liquid crystal materials, as environmental materials, have great research value and bright application prospects in the fields of information display materials, organic optoelectronic materials, etc. Liquid crystal materials have many advantages as new display materials, such as extremely low power consumption and low driving voltage. At the same time, compared with other materials, they also have the advantages of small size, light weight, long life, large display information volume, no electromagnetic radiation, etc., which can meet almost all information display requirements, especially in TFT-LCD (thin film transistor technology) products.

[0003] In the TFT active matrix system, there are mainly TN (Twisted Nematic) mode, IPS (In-Plane Switching) mode, FFS (Fringe Field Switching) mode and VA (Vertical Alignment) mode.

[0004] At present, TFT-LCD product technology has matured and successfully solved technical problems such as viewing angle, resolution, color saturation and brightness. Large-size and small- and medium-size TFT-LCD displays have gradually occupied the mainstream position of flat panel displays in their respective fields. However, the requirements for display technology have been constantly increasing, requiring liquid crystal displays to achieve faster response, reduce driving voltage to reduce power consumption, etc. The liquid crystal material itself plays an important role in improving the performance of liquid crystal displays, especially reducing the rotational viscosity of liquid crystal materials and improving the dielectric anisotropy △ε of liquid crystal materials. In order to improve the performance of materials and adapt them to new requirements, the synthesis of new structural liquid crystal compounds and the study of structure-performance relationship have become an important task in the field of liquid crystals.

[0005] The display of images, especially moving images, is one of the important properties of modern liquid crystal displays. If the response speed of the liquid crystal composition used is too slow, undesirable afterimages will occur when displaying moving images. The physical parameters of the response time of the liquid crystal mixture are determined by the rotational viscosity γ1 and the elastic constant. On the other hand, the elastic constant is also particularly important for ensuring a good black state of the liquid crystal display. However, in general, the clearing point and rotational viscosity of the liquid crystal mixture also increase with the increase of the elastic constant, which means that an improvement in the response time is impossible. Especially in the case of liquid crystal displays for television and video applications (such as LCD TVs, monitors, PDAs, notebooks, game consoles), it is expected that the response time will be significantly reduced.

[0006] For commercial displays such as outdoor displays, a wider display temperature range is required, which means that the liquid crystal is required to have high-definition bright spots and low operating temperature. However, usually, mixtures with high-definition bright spots have high viscosity, which leads to a delay in response time. Therefore, it is necessary to develop liquid crystal compositions with a wide range of use, lower viscosity and faster response time. Summary of the invention

[0007] The main purpose of the present application is to provide a liquid crystal composition with negative dielectric anisotropy, which has low rotational viscosity, can achieve rapid response, and has a large elastic constant, good low-temperature miscibility, and moderate optical anisotropy.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A liquid crystal composition with negative dielectric anisotropy, comprising at least one compound represented by general formula I, at least one compound represented by general formula M, and at least one compound represented by general formula C:

[0010] The structure of the compound shown in general formula I is:

[0011]

[0012] In the general formula I, R1 and R2 each independently represent H, halogen, alkyl, alkoxy or haloalkyl having 1 to 12 carbon atoms, wherein one or more -CH2- groups can each independently be replaced by -O-, -CH=CH-, -C≡C-, -CO-O- or -O-CO- in a manner that the oxygen atom is not directly connected, and the hydrogen on the -CH2- group can be replaced by halogen;

[0013] At least one of R1 and R2 contains a C=C double bond;

[0014] At most one of X1, X2, X3, and X4 is F, and the rest are H;

[0015] The structure of the compound shown in the general formula M is:

[0016]

[0017] In the general formula M, R M1 , R M2 Each independently represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms;

[0018] The rings M1, M2, and M3 are represented independently of each other:

[0019]

[0020] Z M1 , Z M2 Each independently represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-;

[0021] r, s, t represent 0, 1, or 2;

[0022] The structure of the compound shown in general formula C is:

[0023]

[0024] R C1 , R C2 Each independently of one another represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 12 carbon atoms.

[0025] The above-mentioned liquid crystal composition with negative dielectric anisotropy is, as a preferred embodiment, wherein the mass parts of the compound represented by general formula I in the liquid crystal composition are 1-15 parts, the mass parts of the compound represented by general formula M are 1-60 parts, and the mass parts of the compound represented by general formula C are 1-60 parts.

[0026] In the above-mentioned liquid crystal composition with negative dielectric anisotropy, as a preferred embodiment, the compound of general formula I is selected from the following compound group:

[0027]

[0028] In the above-mentioned liquid crystal composition with negative dielectric anisotropy, as a preferred embodiment, the compound of general formula M is selected from the group consisting of the following compounds:

[0029]

[0030] Among them, R M1 , R M2 Each independently represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms;

[0031] Rings A1, B1, B2, C1, D1, D2 are independent of each other

[0032]

[0033] Z M1 It represents -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-, -O-, -C2F4- or -CF=CF-.

[0034] Preferably, the compound of general formula M is selected from at least one of formula M-A1 to formula M-E3:

[0035]

[0036]

[0037] In the above-mentioned liquid crystal composition with negative dielectric anisotropy, as a preferred embodiment, the compound of general formula C is selected from at least one of formulas C-A1 to C-B5:

[0038]

[0039] As a preferred embodiment, the above-mentioned liquid crystal composition with negative dielectric anisotropy further comprises at least one compound represented by general formula E:

[0040] The structure of the compound shown in general formula E is:

[0041]

[0042] R E1 , R E2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms;

[0043] Ring E1 represents

[0044] e represents 1 or 2.

[0045] As a preferred embodiment of the above-mentioned liquid crystal composition with negative dielectric anisotropy, the mass parts of the compound represented by general formula E contained in the liquid crystal composition is 1-59 parts.

[0046] In the above-mentioned liquid crystal composition with negative dielectric anisotropy, as a preferred embodiment, the compound of general formula E is selected from the group consisting of the following compounds:

[0047]

[0048] Among them, R E1 , R E2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms;

[0049] Rings E1, E2, and E3 are represented.

[0050] Preferably, the compound of general formula E is selected from at least one of formula E-A1 to formula E-B10:

[0051]

[0052]

[0053] As a preferred embodiment, the above-mentioned liquid crystal composition with negative dielectric anisotropy further comprises at least one compound represented by the general formula P:

[0054] The structure of the compound shown in general formula P is:

[0055]

[0056] Rings B1, B2, and B3 are independent of each other. express

[0057] in One or more H on the molecule can be replaced by -F, -Cl, or -OCH3;

[0058] Z4 and Z5 each independently represent a CC single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, OCH2-, -CO-O-, -C2F4- or -CF=CF-;

[0059] P1 and P2 each independently represent an acrylate group, a methacrylate group, a crotonate group or a C2-C8 straight-chain alkenyl group;

[0060] S p1 and S p2 Each independently represents a CC single bond, -CH2CH2- or -CO-O-

[0061] r and s each independently represent 0, 1, 2, 3, or 4.

[0062] As a preferred embodiment of the above-mentioned liquid crystal composition with negative dielectric anisotropy, the mass fraction of the compound represented by the general formula P contained in the liquid crystal composition is 0.1-5 parts.

[0063] Preferably, the compound of general formula P is selected from at least one of formula PA to formula PC:

[0064]

[0065]

[0066] As a preferred embodiment, the liquid crystal composition with negative dielectric anisotropy further comprises a stabilizer, and the mass fraction of the stabilizer is 0-5 parts.

[0067] The preparation method of the liquid crystal composition provided by the present invention is to inject the liquid crystal composition containing a polymerizable compound into a liquid crystal screen, and then polymerize it by UV light irradiation, and continuously apply voltage during the irradiation process. The polymerizable compound in the liquid crystal composition polymerizes under UV light irradiation to produce a network structure.

[0068] In addition to the above compounds, the liquid crystal composition of the present invention may also contain conventional nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers or light stabilizers, etc.

[0069] Possible dopants that can be preferably added to the liquid crystal composition of the present invention are shown below:

[0070]

[0071] Wherein, n represents 1-18;

[0072] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be combined with each other to obtain the preferred embodiments of the present invention.

[0073] A second aspect of the present application provides an application of a liquid crystal composition with negative dielectric anisotropy in preparing a liquid crystal display device.

[0074] The use of the above-mentioned liquid crystal composition with negative dielectric anisotropy in the preparation of a liquid crystal display device is, as a preferred embodiment, the liquid crystal display device is a VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display device.

[0075] The beneficial effects of the present invention are as follows: the liquid crystal composition containing a tetracyclic terminal olefin compound described in the present invention has a low rotational viscosity, can achieve a fast response, and at the same time has a large elastic constant, good low-temperature miscibility and moderate optical anisotropy, can adapt to different box thickness designs, and obtain a good display effect. DETAILED DESCRIPTION

[0076] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with examples. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0077] Unless otherwise specified, the temperature unit in the present invention is degrees Celsius; △n represents optical anisotropy (25°C); △ε represents dielectric anisotropy (25°C, 1000Hz); V10 represents threshold voltage, which is the characteristic voltage when the relative transmittance changes by 10% (V, 25°C); γ1 represents rotational viscosity (mPa.s, 25°C); Cp represents the clearing point of the liquid crystal composition (°C); K11, K22, K33 represent flexure, twist and bend elastic constants (pN, 25°C), respectively, and LTS represents the low-temperature stability of the liquid crystal, that is, the liquid crystal is placed in a bottle and stored at low temperature.

[0078] In the following embodiments, the group structures in the liquid crystal compounds are represented by the codes shown in Table 1:

[0079] Table 1 Group structure code of liquid crystal composition

[0080]

[0081] Take the structure of the following compound as an example:

[0082]

[0083] Represented as: VCPGC3

[0084]

[0085] Expressed as: 2CC1OWO2

[0086] In the following embodiments, the preparation of the liquid crystal composition adopts a thermal dissolution method, which includes the following steps: weighing the liquid crystal compound by weight using a balance, wherein there is no specific requirement for the order of weighing and adding, and the liquid crystal compounds are usually weighed and mixed in descending order of melting point, heating and stirring at 60-100°C to make the components melt evenly, then filtering, rotary evaporating, and finally packaging to obtain the target sample.

[0087] In the following embodiments, the weight of each component in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following table.

[0088] Example 1

[0089] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 1 are shown in Table 2:

[0090] Table 2

[0091] category Compound Code Weight Performance parameters Parameter Value I VCPGC3 1.5 Δn 0.1132 C 3CC2 20 Δε -2.66 E 5PP1 14.5 Cp 82.93 M 2C1OWO2 5 γ1 74.8 M 3C1OWO2 11 K11 14.9 M 3CCWO2 3 K22 7.4 M 2CC1OWO2 8 K33 13.6 M 3CC1OWO2 11 LTS -40℃ for 10 days without crystallization M 3CPWO2 5 E 3CPP1 8 E 3CPP2 13

[0092] In the liquid crystal composition of Example 1, 300 ppm of additives are added, and the structure of the additives is as follows:

[0093]

[0094] Example 2

[0095] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 2 are shown in Table 3:

[0096] Table 3

[0097] category Compound Code Weight Performance parameters Parameter Value I VCPGC5 1 Δn 0.1105 C 3CC2 22 Δε -2.65 E 5PP1 14.5 Cp 76.21 M 2C1OWO2 5 γ1 73.3 M 3C1OWO2 11 K11 15.3 M 3CCWO2 3 K22 7.6 M 2CC1OWO2 8.5 K33 13.8 M 3CC1OWO2 11 LTS -40℃ for 10 days without crystallization M 3CPWO2 5 E 3CPP1 7 E 3CPP2 12

[0098] In the liquid crystal composition of Example 2, 300 ppm of additives are added, and the structure of the additives is as follows:

[0099]

[0100] Example 3

[0101] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 3 are shown in Table 4:

[0102] Table 4

[0103] category Compound Code Weight Performance parameters Parameter Value I VCPPC3 5 Δn 0.1114 C 3CC2 20 Δε -2.64 E 5PP1 14.5 Cp 85.27 M 2C1OWO2 5 γ1 72.7 M 3C1OWO2 10 K11 13.8 M 3CCWO2 2 K22 6.9 M 2CC1OWO2 8.5 K33 13.1 M 3CC1OWO2 9 LTS -40℃ for 10 days without crystallization M 3CPWO2 5 E 2CPP2 8 E 3CPP2 13

[0104] In the liquid crystal composition of Example 3, 300 ppm of additives are added, and the structure of the additives is as follows:

[0105]

[0106] Example 4

[0107] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 4 are shown in Table 5:

[0108] Table 5

[0109]

[0110]

[0111] In the liquid crystal composition of Example 4, 300 ppm of additives are added, and the structure of the additives is as follows:

[0112]

[0113] Example 5

[0114] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 5 are shown in Table 6:

[0115] Table 6

[0116]

[0117]

[0118] In the liquid crystal composition of Example 5, 300 ppm of additives are added, and the structure of the additives is as follows:

[0119]

[0120] Example 6

[0121] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 6 are shown in Table 7:

[0122] Table 7

[0123]

[0124]

[0125] In the liquid crystal composition of Example 6, 300 ppm of additives are added, and the structure of the additives is as follows:

[0126]

[0127] Example 7

[0128] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 7 are shown in Table 8:

[0129] Table 8

[0130] category Compound Code Weight Performance parameters Parameter Value I V2CPPC5 2.5 Δn 0.1143 C 3CC2 10 Δε -2.86 C 4CC3 10 Cp 86.01 E 5PP1 12.5 γ1 76.0 M 2C1OWO2 3 K11 14.5 M 3C1OWO2 10 K22 7.3 M 3CCWO2 7.5 K33 13.2 M 2CC1OWO2 10 LTS -40℃ for 10 days without crystallization M 3CC1OWO2 10.5 M 3CPWO2 5 E 2CPP2 8 E 3CPP2 9

[0131] In the liquid crystal composition of Example 7, 300 ppm of additives are added, and the structure of the additives is as follows:

[0132]

[0133] Example 8

[0134] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 8 are shown in Table 9:

[0135] Table 9

[0136] category Compound Code Weight Performance parameters Parameter Value I V2CPGC3 3 Δn 0.1140 C 5CC3 10 Δε -2.90 C 3CCV1 10 Cp 86.23 E 5PP1 12.5 γ1 76.2 M 2C1OWO2 3 K11 14.5 M 3C1OWO2 10 K22 7.3 M 3CCWO2 6 K33 13.3 M 2CC1OWO2 10.5 LTS -40℃ for 10 days without crystallization M 3CC1OWO2 11 M 3CPWO2 5 E 2CPP2 8 E 3CPP2 9

[0137] In the liquid crystal composition of Example 8, 300 ppm of additives are added, and the structure of the additives is as follows:

[0138]

[0139] Example 9

[0140] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 9 are shown in Table 10:

[0141] Table 10

[0142]

[0143]

[0144] In the liquid crystal composition of Example 9, 300 ppm of additives are added, and the structure of the additives is as follows:

[0145]

[0146] Example 10

[0147] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 10 are shown in Table 11:

[0148] Table 11

[0149]

[0150]

[0151] In the liquid crystal composition of Example 10, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0152]

[0153] Embodiment 11

[0154] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 11 are shown in Table 12:

[0155] Table 12

[0156] category Compound Code Weight Performance parameters Parameter Value I 1VCPGC3 4 Δn 0.1087 C 3CC2 15.5 Δε -3.09 C 4CC3 15 Cp 84.89 C 3CCV 12 γ1 75.5 M 2C1OWO2 7.5 K11 14.6 M 3C1OWO2 12 K22 7.3 M 3CCWO2 7 K33 13.3 M 2CC1OWO2 9 LTS -40℃ for 10 days without crystallization M 3CC1OWO2 10 M 5CPWO2 8

[0157] In the liquid crystal composition of Example 11, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0158]

[0159] Example 12

[0160] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 12 are shown in Table 13:

[0161] Table 13

[0162] category Compound Code Weight Performance parameters Parameter Value I VCPGC3 3 Δn 0.1125 I 1VCPGC5 8 Δε -2.99 C 3CC2 18.5 Cp 112.3 C 4CC3 15 γ1 83.5 C 3CCV 13 K11 14.4 M 2C1OWO2 8.5 K22 7.2 M 3C1OWO2 13 K33 13.1 M 3CCWO2 7 LTS -40℃ for 10 days without crystallization M 3PP2WO2 6 M 5PP2WO2 4 M 5CPWO2 5

[0163] In the liquid crystal composition of Example 12, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0164] Example 13

[0165] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 13 are shown in Table 14:

[0166] Table 14

[0167]

[0168] In the liquid crystal composition of Example 13, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0169]

[0170] Embodiment 14

[0171] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 14 are shown in Table 15:

[0172] Table 15

[0173]

[0174]

[0175] In the liquid crystal composition of Example 14, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0176]

[0177] Embodiment 15

[0178] The weight parts and performance parameters of the components of the liquid crystal composition described in Example 15 are shown in Table 16:

[0179] Table 16

[0180]

[0181]

[0182] In the liquid crystal composition of Example 15, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0183]

[0184] 0.5 parts by weight of polymerizable compound VB2 was added to the liquid crystal composition described in Example 15 to prepare a PSVA mixture of PB15.

[0185] The liquid crystal composition (N15) described in Example 15 and the mixture PB15 prepared by adding 0.5 parts of VB2 were respectively filled into a standard VA test box and exposed to UV (100 mw / cm 2) was irradiated for two minutes under an applied voltage of 10V, and the pretilt angle, threshold voltage and response time were tested respectively. The test results are shown in Table 17:

[0186] Table 17

[0187] project titl(°) V10(v) T(ms) N15 89.2 2.65 15.3 PB15 82.3 2.32 6.6

[0188] It can be seen from Table 17 that compared with the corresponding liquid crystal composition, the liquid crystal composition having a polymerizable compound has a lower threshold voltage and a faster response time after polymerization, which significantly improves the response time of the liquid crystal display.

[0189] Comparative Example 1

[0190] The weight parts and performance parameters of the components of the liquid crystal composition of Comparative Example 1 are shown in Table 18:

[0191] Table 18

[0192]

[0193]

[0194] Note: The structures of the compounds I contained in Comparative Example 1 and Example 13 are different.

[0195] In the liquid crystal composition of Comparative Example 1, 300 ppm of an additive is added, and the structure of the additive is as follows:

[0196]

[0197] The performance parameters of the liquid crystal composition described in Comparative Example 1 are compared with the performance parameters of the liquid crystal composition described in Example 13, as shown in Table 19:

[0198] Table 19

[0199]

[0200]

[0201] It can be seen from Table 18 that compared with Comparative Example 1, the liquid crystal composition provided by Example 13 has a higher clearing point and better low-temperature stability, that is, a wider display temperature range; at the same time, it has a lower rotational viscosity, that is, a faster response time.

[0202] The negative dielectric anisotropy liquid crystal composition provided by the present invention has low rotational viscosity, a wide display temperature range, and excellent light stability and thermal stability, and is suitable for VA, MVA, PVA, PSVA and other VA type liquid crystal displays or IPS and FFS type liquid crystal displays, and can effectively improve the response time of the liquid crystal display.

[0203] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A liquid crystal composition with negative dielectric anisotropy, characterized in that: It is composed of at least one compound represented by the general formula I, at least one compound represented by the general formula M, at least one compound represented by the general formula C, at least one compound represented by the general formula E, and at least one compound represented by the general formula P; The structure of the compound shown in general formula I is: In the general formula I, R1 and R2 each independently represent H, halogen, alkyl, alkoxy or haloalkyl having 1 to 12 carbon atoms, wherein one or more -CH2- groups can each independently be replaced by -O-, -CH=CH-, -C≡C-, -CO-O- or -O-CO- in a manner that the oxygen atom is not directly connected, and the hydrogen on the -CH2- group can be replaced by halogen; At least one of R1 and R2 contains a C=C double bond; At most one of X1, X2, X3, and X4 is F, and the rest are H; The structure of the compound shown in the general formula M is: In the general formula M, R M1 , R M2 Each independently represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms; The rings M1, M2, and M3 are represented independently of each other: Z M1 , Z M2 Each independently represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-; r, s, t represent 0, 1, or 2; The structure of the compound shown in general formula C is: R C1 , R C2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or an alkenyloxy group having 2 to 12 carbon atoms; The structure of the compound shown in general formula E is: R E1 , R E2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms; Ring E1 represents e means 1 or 2; The structure of the compound shown in general formula P is: Rings B1, B2, and B3 are independent of each other. in One or more H on the molecule can be replaced by -F, -Cl, or -OCH3; Z4 and Z5 each independently represent a CC single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, OCH2-, -CO-O-, -C2F4- or -CF=CF-; P1 and P2 each independently represent an acrylate group, a methacrylate group, a crotonate group or a C2-C8 straight-chain alkenyl group; S p1 and S p2 Each independently represents a CC single bond, -CH2CH2- or -CO-O-; r and s independently represent 0, 1, 2, 3, and 4; The mass parts of the compound represented by general formula I in the liquid crystal composition are 1-15 parts, the mass parts of the compound represented by general formula M are 1-60 parts, and the mass parts of the compound represented by general formula C are 1-60 parts; The mass parts of the compound represented by general formula E contained in the liquid crystal composition are 1-59 parts; The mass fraction of the compound represented by the general formula P contained in the liquid crystal composition is 0.1-5 parts.

2. A liquid crystal composition with negative dielectric anisotropy according to claim 1, characterized in that: The liquid crystal composition further includes a stabilizer, and the weight percentage of the stabilizer is 0-5 parts.

3. Use of a liquid crystal composition with negative dielectric anisotropy according to any one of claims 1 to 2 in preparing a liquid crystal display device.

4. The use according to claim 3, characterized in that: The liquid crystal display device includes VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display devices.

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