A foamed board imitating red sandalwood grain and EVA modified blend and preparation method thereof

Abstract

The invention discloses an EVA modified blended foam board with imitation red sandalwood wood grain, comprising the following components in parts by weight: a colorant one and a colorant two, wherein the colorant one comprises the following components in parts by weight: the colorant two comprises the following components in parts by weight: the wood grain of the EVA foam board is realistic, and a better simulation effect can be achieved; and the comprehensive performance of the EVA foam board with imitation red sandalwood wood grain is good (toughness, drop resistance, shock resistance, and pressure resistance).

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a red sandalwood-like EVA modified blended foam board and a preparation method thereof. Background Art

[0002] 201210537054.2 discloses an EVA foam board. Compared with the prior art, the EVA foam board and its preparation method of the invention mix cork chips with EVA and form the EVA foam board with the characteristics of environmental protection, light weight, breathability, moisture absorption, antibacterial, deodorizing, cushioning and shock absorption through molding and foaming. On the one hand, it improves the traditional EVA foaming technology and expands the selection range of raw materials in plastic foaming materials; on the other hand, compared with commonly used inorganic fillers, cork chips have the advantages of low density, abundant resources, biodegradability, and little wear on processing equipment, and the obtained foamed material has a good wood feel.

[0003] 202110828612.X The present invention discloses a colored anti-static EVA foam board and a preparation method thereof, comprising the following steps: formulation, taking a certain amount of raw materials of EVA, polyethylene, foaming agent, diisopropylbenzene oxide, zinc oxide, stearic acid, silicon dioxide, and masterbatch; internal mixing, putting a certain amount of raw materials into an internal mixer for mixing; open mixing, putting the mixture mixed in the internal mixer into an open mixer for mixing again; discharging, introducing the mixture mixed in the open mixer into a corresponding mold; foaming, placing the mold in a corresponding environment for foaming; cooling, cooling the mold after foaming is completed; molding, guiding the mixture out of the mold after cooling, and molding the foam board. By designing the preparation method of the EVA foam board, the problem that the EVA foam board is prone to static electricity and discoloration, which causes side effects on the transportation of electronic products, is solved, the anti-static effect of the EVA foam board is optimized, the color fastness of the EVA foam board is effectively improved, and the quality of the EVA foam board is guaranteed.

[0004] However, the wood grain of EVA foam board made by traditional formula and process is poor in realism. Specifically, the traditional wood grain is similar only on two sides but with regular proportions, which cannot achieve the simulation effect at all (such as Figure 1 As shown), the EVA foam board obtained by the prior art is only used for mid- and low-end toys.

[0005] In summary, how to prepare an EVA foam board, the wood grain of the EVA foam board is realistic, can achieve a better simulation effect, and the comprehensive performance of the imitation rosewood wood grain EVA foam board is good (toughness, drop resistance, shock resistance, and compression resistance). Summary of the invention

[0006] The technical problems to be solved by the present invention are:

[0007] A red sandalwood-like EVA modified blended foam board and a preparation method thereof are developed. Compared with traditional wood grain, the red sandalwood-like EVA modified blended foam board has only two sides that are similar but relatively regular and cannot achieve shockproof effect. The red sandalwood-like EVA modified blended foam board has realistic wood grain and can achieve better simulation effect. In addition, the red sandalwood-like EVA foam board has good comprehensive performance (toughness, drop resistance, shock resistance, and compression resistance).

[0008] A red sandalwood-like EVA modified blended foam board comprises the following components in parts by weight:

[0009] Colorant 1 and Colorant 2,

[0010] in,

[0011] Colorant 1, comprising the following components in parts by weight:

[0012] Resin 20-80 parts;

[0013] 10-20 parts of filler;

[0014] 0.8 to 4 parts of stabilizing accelerator;

[0015] 1.5 to 6 parts of foaming agent;

[0016] Colorant 2, comprising the following components in parts by weight:

[0017] Resin 20-80 parts;

[0018] 10-20 parts of filler;

[0019] 0.8 to 4 parts of stabilizing accelerator;

[0020] 1.5 to 6 parts of foaming agent.

[0021] As a further improvement of this solution, the resin is any one or more of OBC, LDPE, and EVA.

[0022] As a further improvement of the present solution, the filler is any one or more of white carbon black, talcum powder, and EVA high-elastic white scraps.

[0023] As a further improvement of this solution, the stabilizing promoter is any one or more of ZNO, ZNST, BIBP, AS, OBSH, and ADC.

[0024] As a further improvement of this solution, the foaming agent is any one or more of OBSH and ADC.

[0025] As a further improvement of the present solution, the pigment one and pigment two also include 3 to 4 parts of abrasion resistant agent and 1 to 4 parts of colorant.

[0026] As a further improvement of this solution, the wear-resistant agent is a high molecular weight organosilicon polymer;

[0027] As a further improvement of this solution, the colorant is any one or more of red iron oxide, 83 yellow, carbon black, 176 red, and permanent violet RL.

[0028] A method for preparing a red sandalwood-like EVA modified blended foam board,

[0029] The method comprises the following preparation steps:

[0030] Step 1) Raw material preparation

[0031] Prepare materials according to the components of color material 1 and color material 2 for mixing in internal mixer;

[0032] Step 2) Mixing

[0033] Put color material 1 and color material 2 into two internal mixers respectively, mix and knead them evenly, and then carry out mixing processing;

[0034] Step 3) Open refining process:

[0035] The dough obtained by mixing is prepared by a two-step process, and is divided into two groups for simultaneous refining, thinned and passed through 3 times for preparation, and then put into the third group for mixing the raw materials of color material 1 and color material 2 to form a thin sheet, and the thickness is controlled to be 0.9mm-1mm;

[0036] The refining process is carried out by the open refining process:

[0037] in,

[0038] 1) The temperature range of the front axle of the mixing mill is 95-98°C, and the temperature range of the rear axle is 92-95°C;

[0039] 2) The material poured out of the internal mixing is thickened and pressed three times to a thickness of 8-10 mm to dissipate heat; the two open mills are closed synchronously to a thickness of 0.9-1 mm; triangular thin packages are cross-made for refining; thin passes are made three times;

[0040] 3) Cold water sheet dispensing machine temperature: roller temperature is 20-25°C;

[0041] Step 4) Making the material box:

[0042] Take 3kg of raw material of colorant 1 and colorant 2 respectively to make 6 mold filling boxes;

[0043] The production method is:

[0044] According to the required mold size, the length and width are 2cm less; first make a stainless steel flat table, cover the opened raw material sheet with the smelted pad facing down, and you will get the required raw material sheet box;

[0045] Step 5) Striping:

[0046] The mixed raw material flakes are cut into strips using a custom-made slitting machine, and the required mold thickness is 1.8 times the width ratio;

[0047] Step 6) Preparation before vulcanization:

[0048] Put the divided raw material strips into the prepared raw material box, and measure the specific gravity of the raw material slices according to the capacity of a certain mold size;

[0049] Step 7) Vulcanization foaming process:

[0050] Load the measured raw material into the inner cavity of the vulcanizer mold, increase the pressure to 20MPa, control the vulcanization temperature at 182℃, and the vulcanization time at 30min;

[0051] Step 8) Discharging and shaping process:

[0052] After vulcanization is completed, take out the foamed board and dissipate heat separately for 1 hour, then stack it and cool it naturally for 72 hours before it can be processed into the required products.

[0053] As a further improvement of this solution, the process flow of step 2) mixing is specifically as follows:

[0054] Process flow:

[0055]

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] 1) High cost performance and easy to process.

[0058] 2) The product is beautiful, with advantages such as cushioning, shock resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc. It is non-toxic and does not absorb water. It is designed to be easy to process and form. Its shockproof performance is better than traditional packaging materials such as polystyrene (foam), and it meets environmental protection requirements. It is the preferred choice for export products. Compared with shockproof packaging, it can be cut and formed; due to the large difference in density, it can also have a wider range of uses.

[0059] 3) The present invention, through the directional selection of the formula and the mutual coordination of the preparation process, is compared with the prior art. If solid wood materials are used, the solid wood materials need to be further added with shockproof materials for protection. The imitation red sandalwood wood grain EVA modified blended foam board prepared by the present invention can be directly used, and has a stronger three-dimensional sense, a realistic imitation red sandalwood wood grain effect, and a stronger market practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 Schematic diagram of the process flow of the prior art;

[0061] Figure 2 Process flow of the present invention Figure 1 ;

[0062] Figure 3 Process flow of the present invention Figure 2 ;

[0063] Figure 4 Schematic diagram of the texture of the existing imitation rosewood foam board Figure 1 ;

[0064] Figure 5 Schematic diagram of the texture of the existing imitation rosewood foam board Figure 2 ;

[0065] Figure 6 Schematic diagram of the texture of the existing imitation rosewood foam board Figure 3 ;

[0066] Figure 7 Schematic diagram of the cross-section of the imitation rosewood grain foam board of the present invention Figure 1 ;

[0067] Figure 8 Schematic diagram of the cross-section of the imitation rosewood grain foam board of the present invention Figure 1 . DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described below in conjunction with embodiments:

[0069] In a specific embodiment of the present invention, the specific preparation process steps are as follows:

[0070] A method for preparing a red sandalwood-like EVA modified blended foam board,

[0071] The method comprises the following preparation steps:

[0072] Step 1) Raw material preparation

[0073] Prepare materials according to the components of color material 1 and color material 2 for mixing in internal mixer;

[0074] Step 2) Mixing

[0075] Two internal mixers are used to respectively put color material 1 and color material 2 into the mixers for mixing and kneading evenly, and then the mixing process is carried out;

[0076] Step 3) Open refining process:

[0077] The dough obtained by mixing is prepared by a two-step process, and is divided into two groups for simultaneous refining, thinned and passed through 3 times for preparation, and then put into the third group for mixing the raw materials of color material 1 and color material 2 to form a thin sheet, and the thickness is controlled to be 0.9mm-1mm;

[0078] The refining process is carried out by the open refining process:

[0079] in,

[0080] 1) The temperature range of the front axle of the mixing mill is 95-98°C, and the temperature range of the rear axle is 92-95°C;

[0081] 2) The material poured out of the internal mixing is thickened and pressed three times to a thickness of 8-10 mm to dissipate heat; the two open mills are closed synchronously to a thickness of 0.9-1 mm; triangular thin packages are cross-made for refining; thin passes are made three times;

[0082] 3) Cold water sheet dispensing machine temperature: roller temperature is 20-25°C;

[0083] Step 4) Making the material box:

[0084] Take 3kg of raw material of colorant 1 and colorant 2 respectively to make 6 mold filling boxes;

[0085] The production method is:

[0086] According to the required mold size, the length and width are 2cm less; first make a stainless steel flat table, cover the opened raw material sheet with the smelted pad facing down, and you will get the required raw material sheet box;

[0087] Step 5) Striping:

[0088] The mixed raw material flakes are cut into strips using a custom-made slitting machine, and the required mold thickness is 1.8 times the width ratio;

[0089] Step 6) Preparation before vulcanization:

[0090] Put the divided raw material strips into the prepared raw material box, and measure the specific gravity of the raw material slices according to the capacity of a certain mold size;

[0091] Step 7) Vulcanization foaming process:

[0092] Load the measured raw material into the inner cavity of the vulcanizer mold, increase the pressure to 20MPa, control the vulcanization temperature at 182℃, and the vulcanization time at 30min;

[0093] Step 8) Discharging and shaping process:

[0094] After vulcanization is completed, take out the foamed board and dissipate heat separately for 1 hour, then stack it and cool it naturally for 72 hours before it can be processed into the required products.

[0095] As a further improvement of this solution, the process flow of step 2) mixing is specifically as follows:

[0096] Process flow:

[0097]

[0098] More specifically, the raw materials and addition amounts of Examples 1 to 4 are shown in Table 1:

[0099] Table 1. Raw materials and dosage of Examples 1-4 (unit: KG)

[0100]

[0101]

[0102] Product chemical testing and analysis results:

[0103] 1. European Commission Decision on the Implementation of the EU Material Directive 2009 / 48 / EC Harmonized Standards (EU) 2021 / 1992 - EN71-3: 2019 + A1: 2021 - Specific Elements Migration Test (for Category 3: Product Materials Can Be Scraped)

[0104]

[0105]

[0106] Detection method: Refer to EN71-3:2019+A1:2021 and use ICP-OES, IC-UV or LC-ICP-MS for analysis.

[0107] 2. EU Decision (EC) No 1907 / 2006 REACH Annex XVII and its amendment (EU) 2016 / 217 Article 23 - Cadmium and its compounds

[0108] Test method: Refer to EN 1122:2001 method B and use AAS or ICP-OES for analysis.

[0109]

[0110] 3. Polycyclic Aromatic Hydrocarbons (PAHs)

[0111] Detection method: Refer to AfPS GS 2019:01PAK method for detection and use GC-MS for analysis.

[0112]

[0113]

[0114] 4. European Commission Directive (EU) 2015 / 2115-Formamide content

[0115] Test method: Solvent extraction, analysis by GC-MS.

[0116]

[0117] Remark:

[0118] According to the requirements of EU (EU) 2015 / 2115, if the formamide content test value is less than 200mg / kg, then there is no need to conduct a release content test. However, if the content value exceeds 200mg / kg, then a release test is required to confirm whether the sample meets the release limit requirement of (EU) 2015 / 2115 of 20ug / m 3 .

[0119] The performance test of the EVA modified blended foam board imitating red sandalwood grain of the present invention is as follows:

[0120] Sample name: EVA modified blended foam material with imitation rosewood grain;

[0121] Material: Modified EVA:

[0122] 1. Sample description

[0123] Test items Sample size density 50*50*4mm Tensile samples 140*27*4mm Tearing samples 100*20*4mm hardness 100*100*25mm

[0124] 2. Test Standards

[0125] Density test standard: ASTM D3575

[0126] Tensile test standard: ASTM D3574-08

[0127] Tear test standard: JIS K67671999

[0128] Hardness test standard: Shore C

[0129] 3. Testing process

[0130] Take the EVA modified wood grain foam board, cut it into the specified size, and conduct relevant tests according to the above experimental standards. Note: All samples are tested at 23±1℃ in accordance with GB / T2918-2018.

[0131] The test was conducted after environmental conditioning at 50±5% RH for 24 hours.

[0132] 4. Test Results

[0133] Example 1 test results:

[0134]

[0135] Example 2 test results:

[0136]

[0137] Example 3 test results:

[0138]

[0139] Example 4 Test Results

[0140]

[0141]

[0142] From the comparison of Examples 1 to 4, it can be seen that:

[0143] The present invention is carried out synchronously by eight machines. Through the process steps of the present invention, the temperature, time and thickness are coordinated with each other, and finally the simulated wood grain foaming board is obtained. Otherwise, if the above-mentioned influencing conditions are not well controlled, it is easy to produce a product without wood grain lines, and the final product is directly scrapped;

[0144] Furthermore, according to the formula of the present invention, the expansion ratio point and the temperature and time control point of the colorant of the colorant 1 and the colorant 2 must be at the same limit, and the directional selection of the foaming agent and the stabilizing promoter and the control ratio range of the two must be accurate;

[0145] From the comparison between the test results and the accompanying drawings, it can be seen that the product of the present invention not only has a stronger three-dimensional sense and a realistic imitation of rosewood grain, but also has the advantages of buffering, shock resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and non-absorbent. It is designed to be easy to process and form, and its shockproof performance is better than traditional packaging materials such as polystyrene (foam), and it meets environmental protection requirements, and is a preferred choice for export products. Compared with shockproof packaging, it can be cut and formed; due to the large difference in density, it can also have a wider range of uses. Compared with the prior art, the solid wood needs to be protected by additional shockproof materials. This product can be used directly, has a stronger three-dimensional sense, and is more practical in the market.

[0146] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent changes made using the present invention are within the patent protection scope of the present invention.

Claims

1. A method for preparing a foamed board of EVA modified blend with imitation red sandalwood grain, characterized in that: The EVA modified blended foam board imitating red sandalwood grain comprises the following components in parts by weight: Colorant 1 and Colorant 2, in, Colorant 1, comprising the following components in parts by weight: Resin 20~80 parts; 10~20 portions of filler; 0.8~4 parts of stabilizing accelerator; 1.5~6 parts of foaming agent; Colorant 2, comprising the following components in parts by weight: Resin 20~80 parts; 10~20 portions of filler; 0.8~4 parts of stabilizing accelerator; 1.5~6 parts of foaming agent; The method for preparing the foamed board of EVA modified blending imitating red sandalwood grain The method comprises the following preparation steps: Step 1) Raw material preparation Prepare materials according to the components of color material 1 and color material 2 for mixing in internal mixer; Step 2) Mixing Put color material 1 and color material 2 into two internal mixers respectively, mix and knead them evenly, and then carry out mixing processing; Step 3) Open refining process: The dough obtained by mixing is prepared by a two-step process, and is divided into two groups for simultaneous refining, thinned and passed through 3 times for preparation, and then put into the third group for mixing the raw materials of color material 1 and color material 2 to form a thin sheet, and the thickness is controlled to be 0.9mm-1mm; The specific process of refining is as follows: in, 1) The temperature range of the front axle of the mixing mill is 95~98℃, and the temperature range of the rear axle is 92~95℃; 2) Press the material poured out of the mixer three times to a thickness of 8-10mm to dissipate heat; close the two open mills synchronously to a thickness of 0.9-1mm; cross-make triangular thin packages for refining; make thin passes three times; 3) Cold water film dispensing machine temperature: roller temperature is 20~25℃; Step 4) Prepare the raw material packing box: Take 3kg of raw material sheets of colorant 1 and colorant 2 respectively to prepare 6 raw material sheet filling boxes; The specific production method is: According to the required mold size, the length and width are 2cm less; first make a stainless steel flat table, cover the opened raw material sheet with the smelted pad facing down, and you will get the required raw material sheet loading box; Step 5) Striping: The mixed raw material flakes are cut into strips using a custom-made slitting machine, and the required mold thickness is 1.8 times the width ratio; Step 6) Preparation before vulcanization: Put the divided raw material strips into the prepared raw material sheet loading box, and measure the specific gravity of the raw material sheet according to the capacity of a certain mold size; Step 7) Vulcanization foaming process: Load the measured raw material into the inner cavity of the vulcanizer mold, increase the pressure to 20MPa, control the vulcanization temperature at 182℃, and the vulcanization time at 30min; Step 8) Discharging and shaping process: After vulcanization is completed, take out the foamed board and dissipate heat separately for 1 hour, then stack it and cool it naturally for 72 hours before it can be processed into the required products.

2. The method for preparing the EVA modified blended foamed board imitating red sandalwood grain according to claim 1, characterized in that: The resin is any one or more of OBC, LDPE and EVA.

3. The method for preparing the EVA modified blended foamed board imitating red sandalwood grain according to claim 1, characterized in that: The filler is any one or more of white carbon black, talcum powder, and EVA high-elastic white scraps.

4. The method for preparing the EVA modified blended foamed board imitating red sandalwood grain according to claim 1, characterized in that: The stabilizing promoter is any one or more of ZnO, ZnST and BIBP.

5. The method for preparing the EVA modified blended foamed board imitating red sandalwood grain according to claim 1, characterized in that: The foaming agent is any one or more of OBSH and ADC.

6. The method for preparing the EVA modified blended foamed board imitating red sandalwood grain according to claim 1, characterized in that: The pigment one and pigment two also include 3-4 parts of anti-wear agent and 1-4 parts of colorant.

7. The method for preparing the EVA modified blended foamed board imitating red sandalwood grain according to claim 6, characterized in that: The wear-resistant agent is a high molecular weight organosilicon polymer; The colorant is any one or more of iron oxide red, 83 yellow, carbon black, 176 red, and permanent violet RL.

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