Lightweight automobile spare tire cover plate processing technology based on pu honeycomb board

Abstract

The application discloses a kind of based on PU honeycomb plate light-weight vehicle spare tire cover processing technology, comprising the following steps: S1, the preparation of PU paint, S2, modified glass fiber felt preparation, S3, PU honeycomb plate preparation, S4, edge and accessory assembly;The automobile spare tire cover produced by the application uses honeycomb plate to support, uses two layers of modified glass fiber felt to enhance strength and toughness, uses face blanket to increase appearance, only uses two layers of glass fiber felt, honeycomb plate and face blanket, reduces the amount of support plate, reduces the weight of spare tire cover, glass fiber felt is treated by twice coating PU paint, has good strength, toughness and aging resistance, the light-weight spare tire cover prepared by the above method makes the prepared spare tire cover have softness, high strength, aging resistance and light-weight property.

Description

Technical Field

[0001] This invention relates to the field of spare tire cover processing technology, specifically a lightweight automotive spare tire cover processing technology based on PU honeycomb panels. Background Technology

[0002] Every car carries a spare tire for immediate replacement in case of tire damage. Cars are typically designed and manufactured with a spare tire compartment for this purpose. For common passenger vehicles like sedans, this compartment is usually hidden in the lower part of the trunk, with a spare tire cover on top. This cover can be used to store miscellaneous items. The spare tire cover serves as a decorative and soundproofing component, covering and isolating the spare tire compartment to maintain a flat and consistent layout of the trunk. Addressing functional requirements such as tire compartment isolation, luggage compartment support, and vehicle noise reduction, the spare tire cover functions as a decoration, supports heavy objects, and provides sound insulation. Currently, the most commonly used material for spare tire covers is paper honeycomb, which, compared to traditional materials like wood powder board, GMT board, and wood, offers higher strength, lighter weight, and easier molding.

[0003] Due to increasingly stringent requirements for energy conservation and overall vehicle emissions in the automotive industry, existing spare tire covers are bulky and heavy, making them difficult to move and place. Furthermore, existing spare tire covers are typically thin and have significant flexibility, making them prone to deformation when moving or placing items. Therefore, this paper proposes a lightweight automotive spare tire cover manufacturing process based on PU honeycomb panels. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a lightweight automotive spare tire cover processing technology based on PU honeycomb panels.

[0005] The technical solution of this invention is: a processing technology for a lightweight automotive spare tire cover based on PU honeycomb panels, comprising the following steps:

[0006] Preparation of S1 and PU coatings:

[0007] The PU coating is composed of type A PU and type B PU, with a weight ratio of type A PU: type B PU = 1:2;

[0008] S2. Preparation of modified glass fiber mat:

[0009] Two glass fiber mats are coated with 65-80% type B PU and baked at 85-95℃ for 8-16 minutes to obtain two pre-modified glass fiber mats. Then, the remaining 20-35% type B PU is mixed evenly with type A PU and heated to 70-80℃. This mixture is then coated onto the two pre-modified glass fiber mats with residual heat and baked at 105-115℃ until completely dry. After natural cooling, the modified glass fiber mat is obtained.

[0010] S3, PU honeycomb panel preparation:

[0011] The adhesive side of the blanket is placed in the heating mold, and then the modified glass fiber felt is laid on both sides of the honeycomb board and sent into the heating mold. Then, it is hot-pressed to form a PU honeycomb board.

[0012] S4. Assembly of edging and accessories:

[0013] After spraying adhesive onto the area where the edge needs to be covered, wrap it around the upper layer of fiberglass felt, and then install the accessories EPP pad and PU mixed-color cotton to obtain the required spare tire cover.

[0014] Explanation: Using honeycomb panels for support, two layers of modified fiberglass mat for enhanced strength and toughness, and a facing blanket for improved appearance, this method reduces the amount of supporting material used and lowers the weight of the spare tire cover by using only two layers of fiberglass mat, honeycomb panels, and a facing blanket. The fiberglass mat is treated with two coats of PU coating to achieve good strength, toughness, and aging resistance. The lightweight spare tire cover prepared by the above method combines flexibility, high strength, aging resistance, and lightweight properties.

[0015] Furthermore, the coating thickness of the glass fiber mat is 1-3 mm, and the coating thickness of the pre-modified glass fiber mat is 2-5 mm.

[0016] Instructions: Coating 1-3mm of Type B PU onto glass fiber, taking advantage of its low permeability, creates a pre-modified glass fiber felt with good strength and toughness. Then, applying a 2-5mm thick PU coating results in a modified glass fiber felt with wear resistance, scratch resistance, and fatigue resistance.

[0017] Furthermore, the temperature during hot pressing is 115-125℃, the pressure is 16-19MPa, and the time is 75-85s.

[0018] Note: PU honeycomb panels formed under this temperature and pressure have excellent physical properties.

[0019] Furthermore, the adhesive is an environmentally friendly PUR adhesive.

[0020] Note: PUR hot melt adhesive has a low melting temperature and good resistance to extreme cold and heat. Because it undergoes a bridging reaction with moisture in the air after melting, it cannot be melted again. The spare tire cover made from it has little odor and low VOC.

[0021] Furthermore, the basis weight of the glass fiber mat is 400-700 g / m². 2 .

[0022] Note: This weight of glass fiber is selected for modification to enhance its physical properties. Modified glass fiber is used to reinforce the upper and lower layers of the honeycomb panel.

[0023] Furthermore, the preparation method of the type A PU is as follows:

[0024] Place 3.5-6.5 parts of heavy calcium carbonate powder, 5.5-8.5 parts of silica powder, and 4.5-9.5 parts of glass fiber powder in a mixer and mix at high speed for 10-40 minutes to obtain a mixed solid. Then, add 105-115 parts of two-component polyurethane resin to 30-41 parts of dimethylacetamide and mix evenly. When the mixture is heated to 65°C, add 0.06-0.2 parts of ethylene bisoleamide at an addition rate of 0.004-0.008 parts / °C. When the temperature reaches 80°C, add the remaining ethylene bisoleamide and 0.05-0.12 parts of trimethylamine. Continue stirring until evenly mixed, then add the mixed solid and continue heating and stirring until evenly mixed to obtain type A PU.

[0025] Note: The type A PU prepared above has anti-aging properties and increases the service life of the spare tire cover. By adding ethylene bisoleamide and trimethylamine to the two-component polyurethane resin and dimethylacetamide mixture according to the above method, the adhesiveness, thermal stability and aging resistance of type A PU are increased, thereby making the spare tire cover wear-resistant and scratch-resistant.

[0026] Furthermore, the preparation method of the type B PU is as follows:

[0027] 85-95 parts of epoxy resin, 1.5-2.5 parts of PEEK resin, 2.5-3.5 parts of chopped carbon fiber, 1.5-2.5 parts of additives, and 4.5-5.5 parts of montmorillonite are added to a mixer and stirred at 60-70°C for 50-70 minutes. Then, 24-45 parts of water-based PU resin are added and mixed to obtain type B PU.

[0028] Description: Water-based PU resin is used to modify epoxy resin. By adding PEEK resin and additives, the viscosity and mechanical properties of the epoxy resin are improved. Montmorillonite generates nanoparticles in the epoxy resin, which improves the toughness of the epoxy resin. Montmorillonite is uniformly dispersed in type B PU in a monolayer form. Finally, a modified glass fiber mat with good toughness, high fatigue resistance and high strength is prepared.

[0029] Furthermore, the heating temperature is 80-90℃, and the stirring time is 40-50 minutes.

[0030] Note: Maintaining the heating temperature at 80-90℃ and stirring for 40-50 minutes will result in better performance of the prepared type A PU.

[0031] Furthermore, the additive is adipic acid dihydrazide.

[0032] Note: Adipic acid dihydrazide is a high-melting-point powdered compound prepared by reacting organic acids with hydrazine. It serves as a latent curing agent for epoxy resins. The resulting Type B PU exhibits excellent flexibility, water resistance, weather resistance, corrosion resistance, and insulation properties.

[0033] The beneficial effects of this invention are:

[0034] (1) The spare tire cover produced by this invention uses a honeycomb board as support, two layers of modified glass fiber felt to enhance strength and toughness, and a face blanket to increase appearance. It only uses two layers of glass fiber felt, honeycomb board and face blanket, which reduces the amount of support material and reduces the weight of the spare tire cover. The glass fiber felt is treated with PU coating twice to obtain good strength, toughness and aging resistance. The lightweight spare tire cover prepared by the above method has the advantages of softness, high strength, aging resistance and lightweight.

[0035] (2) The spare tire cover produced by this invention is environmentally friendly in its processing, which solves the problem of VOCs emitted during the production of existing spare tire covers and effectively reduces VOCs in the vehicle. At the same time, through two coatings, 1-3mm of type B PU is coated on the glass fiber and the low permeability is used as a base layer to obtain a pre-modified glass fiber felt with good strength and toughness. Then, a 2-5mm thick PU coating is applied to obtain a modified glass fiber felt with wear resistance, scratch resistance and fatigue resistance. Finally, a spare tire cover with high strength and good wear resistance is obtained. Detailed Implementation

[0036] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0037] Example 1

[0038] A lightweight automotive spare tire cover manufacturing process based on PU honeycomb panels includes the following steps:

[0039] Preparation of S1 and PU coatings:

[0040] The PU coating is composed of type A PU and type B PU, with a weight ratio of type A PU: type B PU = 1:2;

[0041] S2. Preparation of modified glass fiber mat:

[0042] Two glass fiber mats were coated with 75% type B PU and baked at 90°C for 12 minutes to obtain two pre-modified glass fiber mats. Then, the remaining 25% type B PU was mixed evenly with type A PU and heated to 75°C. The mixture was then coated onto the two pre-modified glass fiber mats with residual heat and baked at 110°C until completely dry. After natural cooling, the modified glass fiber mats were obtained.

[0043] S3, PU honeycomb panel preparation:

[0044] The adhesive side of the blanket is placed in the heating mold, and then the modified glass fiber felt is laid on both sides of the honeycomb board and sent into the heating mold. Then, it is hot-pressed to form a PU honeycomb board.

[0045] S4. Assembly of edging and accessories:

[0046] After spraying adhesive onto the area where the edge needs to be covered, wrap it around the upper layer of fiberglass felt, and install the accessories EPP pads and PU mixed-color cotton. Adjust according to product requirements to obtain the required spare tire cover.

[0047] The coating thickness of the glass fiber mat is 2 mm, and the coating thickness of the pre-modified glass fiber mat is 3 mm.

[0048] The hot pressing process is carried out at a temperature of 120°C, a pressure of 18 MPa, and a time of 80 seconds.

[0049] The adhesive is an environmentally friendly PUR adhesive;

[0050] The weight of the glass fiber mat is 550 g / m². 2 ;

[0051] The preparation method of the type A PU is as follows:

[0052] 4.5 parts of heavy calcium carbonate powder, 7 parts of silica powder, and 7.5 parts of glass fiber powder were placed in a mixer and mixed at high speed for 25 minutes to obtain a mixed solid. Then, 110 parts of two-component polyurethane resin were added to 36 parts of dimethylacetamide and mixed evenly. When the mixture was heated to 65°C, 0.15 parts of ethylene bisoleamide were added at an addition rate of 0.009 parts / °C. When the temperature reached 80°C, the remaining ethylene bisoleamide and 0.08 parts of trimethylamine were added. After stirring evenly, the mixed solid was added and the mixture was heated and stirred evenly to obtain type A PU.

[0053] The preparation method of the type B PU is as follows:

[0054] 90 parts of epoxy resin, 2 parts of PEEK resin, 3 parts of chopped carbon fiber, 2 parts of additives and 5 parts of montmorillonite were added to a mixer and stirred at 65°C for 60 minutes. Then 35 parts of waterborne PU resin were added and mixed to obtain type B PU.

[0055] The heating temperature is 85°C, and the stirring time is 45 minutes.

[0056] The additive is adipic acid dihydrazide.

[0057] Example 2

[0058] This embodiment is basically the same as Embodiment 1, except that the coating thickness of the glass fiber felt is 1 mm, and the coating thickness of the pre-modified glass fiber felt is 2 mm.

[0059] Example 3

[0060] This embodiment is basically the same as Embodiment 1, except that the coating thickness of the glass fiber mat is 3mm and the coating thickness of the pre-modified glass fiber mat is 5mm.

[0061] Example 4

[0062] This embodiment is basically the same as Embodiment 1, except that the basis weight of the glass fiber mat is 400 g / m². 2 .

[0063] Example 5

[0064] This embodiment is basically the same as Embodiment 1, except that the basis weight of the glass fiber mat is 700 g / m². 2 .

[0065] Example 6

[0066] This embodiment is basically the same as Embodiment 1, except that the preparation method of the type A PU is as follows:

[0067] 3.5 parts of heavy calcium carbonate powder, 5.5 parts of silica powder, and 4.5 parts of glass fiber powder were placed in a mixer and mixed at high speed for 10 minutes to obtain a mixed solid. Then, 105 parts of two-component polyurethane resin were added to 30 parts of dimethylacetamide and mixed evenly. When the mixture was heated to 65°C, 0.06 parts of ethylene bisoleamide were added at an addition rate of 0.004 parts / °C. When the temperature reached 80°C, the remaining ethylene bisoleamide and 0.05 parts of trimethylamine were added. After stirring evenly, the mixed solid was added and the mixture was heated and stirred evenly to obtain type A PU.

[0068] Example 7

[0069] This embodiment is basically the same as Embodiment 1, except that the preparation method of the type A PU is as follows:

[0070] 6.5 parts of heavy calcium carbonate powder, 8.5 parts of silica powder, and 9.5 parts of glass fiber powder were placed in a mixer and mixed at high speed for 40 minutes to obtain a mixed solid. Then, 115 parts of two-component polyurethane resin were added to 41 parts of dimethylacetamide and mixed evenly. When the mixture was heated to 65°C, 0.2 parts of ethylene bisoleamide were added at a rate of 0.01 parts / °C. When the temperature reached 80°C, the remaining ethylene bisoleamide and 0.12 parts of trimethylamine were added. After stirring evenly, the mixed solid was added and the mixture was heated and stirred evenly to obtain type A PU.

[0071] Example 8

[0072] This embodiment is basically the same as Embodiment 1, except that the preparation method of the type A PU is as follows:

[0073] 4.5 parts of heavy calcium carbonate powder, 7 parts of silica powder, and 7.5 parts of glass fiber powder were placed in a mixer and mixed at high speed for 25 minutes to obtain a mixed solid. Then, 110 parts of two-component polyurethane resin were added to 36 parts of dimethylacetamide and mixed evenly. When the mixture was heated to 65°C, 0.06 parts of ethylene bisoleamide were added at a rate of 0.004 parts / °C. When the temperature reached 80°C, the remaining ethylene bisoleamide and 0.08 parts of trimethylamine were added. After stirring evenly, the mixed solid was added and the mixture was heated and stirred evenly to obtain type A PU.

[0074] Example 9

[0075] This embodiment is basically the same as Embodiment 1, except that the preparation method of the type A PU is as follows:

[0076] 4.5 parts of heavy calcium carbonate powder, 7 parts of silica powder, and 7.5 parts of glass fiber powder were placed in a mixer and mixed at high speed for 25 minutes to obtain a mixed solid. Then, 110 parts of two-component polyurethane resin were added to 36 parts of dimethylacetamide and mixed evenly. When the mixture was heated to 65°C, 0.2 parts of ethylene bisoleamide were added at a rate of 0.01 parts / °C. When the temperature reached 80°C, the remaining ethylene bisoleamide and 0.08 parts of trimethylamine were added. After stirring evenly, the mixed solid was added and the mixture was heated and stirred evenly to obtain type A PU.

[0077] Example 10

[0078] This embodiment is basically the same as Embodiment 1, except that the preparation method of the B-type PU is as follows:

[0079] 85 parts of epoxy resin, 1.5 parts of PEEK resin, 2.5 parts of chopped carbon fiber, 1.5 parts of additives and 4.5 parts of montmorillonite were added to a mixer and stirred at 60°C for 50 minutes. Then, 24 parts of water-based PU resin were added and mixed to obtain type B PU.

[0080] Example 11

[0081] This embodiment is basically the same as Embodiment 1, except that the preparation method of the B-type PU is as follows:

[0082] 95 parts of epoxy resin, 2.5 parts of PEEK resin, 3.5 parts of chopped carbon fiber, 2.5 parts of additives and 5.5 parts of montmorillonite were added to a mixer and stirred at 70°C for 70 minutes. Then, 45 parts of water-based PU resin were added and mixed to obtain type B PU.

[0083] Example 12

[0084] This embodiment is basically the same as embodiment 1, except that the heating temperature is 80°C and the stirring time is 50 minutes.

[0085] Example 13

[0086] This embodiment is basically the same as embodiment 1, except that the temperature for continued heating is 90°C and the stirring time is 40 minutes.

[0087] Example 14

[0088] This embodiment is basically the same as Embodiment 1, except that, in step S2, the preparation of the modified glass fiber mat:

[0089] Two glass fiber mats were coated with 65% type B PU and baked at 90°C for 8-16 minutes to obtain two pre-modified glass fiber mats. Then, the remaining 35% type B PU was mixed evenly with type A PU and heated to 80°C. This mixture was then coated onto the two pre-modified glass fiber mats that were still heated. The mats were then baked at 110°C until completely dry and allowed to cool naturally to obtain modified glass fiber mats.

[0090] Example 15

[0091] This embodiment is basically the same as Embodiment 1, except that, in step S2, the preparation of the modified glass fiber mat:

[0092] Two glass fiber mats were coated with 80% type B PU and baked at 90°C for 16 minutes to obtain two pre-modified glass fiber mats. Then, the remaining 20% ​​type B PU was mixed evenly with type A PU and heated to 70°C. This mixture was then coated onto the two pre-modified glass fiber mats that were still heated. The mats were then baked at 110°C until completely dry and allowed to cool naturally to obtain modified glass fiber mats.

[0093] Experimental Example

[0094] The physical properties of the spare tire cover plates prepared in each embodiment were measured, and the specific investigation is as follows:

[0095] Examples 1-3, 6-11, and 14-15 were used as experimental examples for comparison; at the same time, Comparative Example 1 was set up: the glass fiber mat was not modified and all other conditions remained unchanged.

[0096] Comparative Example 2: In step S2, the fiberglass mat was coated with PU coating once, while other conditions remained unchanged;

[0097] Comparative Example 3: In the preparation of type A PU, when heated to 65°C, 0.15 parts of ethylene bisoleamide were added, and when the temperature reached 80°C, 0.08 parts of trimethylamine were added, with other conditions remaining unchanged;

[0098] Comparative Example 4: In the preparation of type A PU, ethylene bisoleamide was not added, and all other conditions remained unchanged;

[0099] Comparative Example 5: In the preparation of type A PU, trimethylamine was not added, and all other conditions remained unchanged;

[0100] The results are shown in Table 1:

[0101] Table 1 Physical properties of spare tire cover

[0102]

[0103]

[0104] The impact steel ball has a mass of (400±10)g and a diameter of (600±2)mm. Adjust the vertical distance between the lowest point of the steel ball and the center of the spare tire cover to (200±10)mm and let it fall freely.

[0105] As can be seen from the results in Table 1 above, different ratios of different raw materials have a certain impact on the bending strength, peel strength and impact resistance of the spare tire cover. Among them, the spare tire cover prepared in Example 1 and Example 3 has high bending strength, high peel strength and strong impact resistance. Considering the production cost and production time, the coating thickness of Example 1 is better.

[0106] Meanwhile, a comparison between Comparative Example 1 and Example 1 shows that using conventional modified glass fiber mat in the preparation of the spare tire cover significantly reduces the flexural strength, peel strength, and impact resistance of the resulting spare tire cover. Therefore, the modified glass fiber mat of this application significantly improves the performance of the spare tire cover. A comparison between Comparative Example 2 and Example 1 shows that modifying the glass fiber mat using the method of Example 1 results in a spare tire cover with high flexural strength, high peel strength, and high impact resistance, exhibiting superior physical properties. A comparison between Comparative Example 3 and Example 1 shows that adding ethylene bisoleamide according to the addition method of Example 1 results in a spare tire cover with high flexural strength, high peel strength, and high impact resistance, exhibiting superior physical properties. Comparative Examples 4 and 5 with Example 1 show that the absence of ethylene bisoleamide or trimethylamine in the A-type PU raw material leads to low flexural strength, low peel strength, and poor impact resistance in the prepared spare tire cover. Therefore, the spare tire cover prepared according to Example 1 of this application has superior performance and lower cost.

Claims

1. A processing technology for lightweight automobile spare tire cover based on PU honeycomb panel, characterized in that, It comprises the following steps: S1, preparation of PU coating: The PU coating is composed of A-type PU and B-type PU, and the weight ratio of A-type PU to B-type PU is 1:2; S2, preparation of modified glass fiber felt: Coat 65-80% of B-type PU on two pieces of glass fiber felt respectively, and bake at 85-95℃ for 8-16min to obtain two pieces of pre-modified glass fiber felt; then mix the remaining 20-35% of B-type PU with A-type PU uniformly and heat to 70-80℃, coat on the two pieces of pre-modified glass fiber felt with residual heat, and mix bake at 105-115℃ until dry, and then naturally cool to obtain modified glass fiber felt; S3, preparation of PU honeycomb panel: Place the glass fiber felt with glue on the heated mold, and then place the modified glass fiber felt on the upper and lower surfaces of the honeycomb panel into the heated mold, and then hot press to obtain a PU honeycomb panel; S4, edge covering and accessory assembly: Spray glue on the surface blanket at the position where edge covering is needed, and then cover it on the upper glass fiber felt, and install accessories such as EPP cushion and PU miscellaneous cotton, and adjust according to product requirements to obtain the required spare tire cover plate; The coating thickness of the glass fiber felt is 1-3mm, and the coating thickness of the pre-modified glass fiber felt is 2-5mm; The temperature during hot pressing is 115-125℃, the pressure is 16-19MPa, and the time is 75-85s; The glue is environmentally friendly PUR glue; The glass fiber mat has a grammage of 400-700 g / m 2 ; The preparation method of A-type PU is as follows: Put 3.5-6.5 parts of heavy calcium carbonate powder, 5.5-8.5 parts of silicon dioxide powder and 4.5-9.5 parts of glass fiber powder into a mixer and mix at high speed for 10-40min to obtain a mixed solid; then mix 105-115 parts of two-component polyurethane resin into 30-41 parts of dimethylacetamide uniformly, heat to 65℃, add 0.06-0.2 parts of ethylene bisoleic acid amide at an addition rate of 0.004-0.01 parts / ℃, when the temperature reaches 80℃, add the remaining ethylene bisoleic acid amide and 0.05-0.12 parts of trimethylamine, continue to stir uniformly, then add the mixed solid, continue to heat and stir uniformly, and A-type PU is obtained; The preparation method of B-type PU is as follows: Put 85-95 parts of epoxy resin, 1.5-2.5 parts of PEEK resin, 2.5-3.5 parts of short carbon fiber, 1.5-2.5 parts of additive and 4.5-5.5 parts of montmorillonite into a mixer and stir and mix at a temperature of 60-70℃ for 50-70min, then add 24-45 parts of waterborne PU resin to the mixture to obtain B-type PU.

2. The processing technology of the PU honeycomb panel-based light-weight tire cover for vehicles according to claim 1, characterized in that, The temperature for continued heating is 80-90℃, and the stirring time is 40-50min.

3. The process for processing the PU honeycomb panel-based light-weight tire spare cover for vehicles according to claim 1, characterized in that, The additive is adipic acid dihydrazide.

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