Chapter IV production technology of other plastic

Chapter IV production technology of other plastic packaging materials (82)

72 What is the production process of acrylic pressure-sensitive tape

answer: (1) production of acrylic pressure-sensitive adhesive

acrylic pressure-sensitive adhesive is copolymerized with a certain amount of hard components with the high-grade ester of acrylic acid (carbon number 4 ~ 8) as the main component. The formula is as follows: 96 parts of 2-ethyl hexyl acrylate, 4 parts of acrylic acid, 248 parts of ethyl acetate, 0.62 parts of benzoyl peroxide. The above formula is stirred slowly under N2 gas flow at 55 ℃ for 6h, then 79 parts of ethyl acetate and 0.62 parts of benzoyl peroxide are added, and then maintained at 60 ℃ for 5h. The solution is diluted with 280 parts of heptane to 23.3% concentration. 100 parts of polyamide resin are added under stirring, which is gel like after mixing. Denatured alcohol with the same weight as the solid is added, and then 6 parts of acetic acid are added to 100 parts of solid to destroy the gel, Thus, a coating material is obtained

(2) production of acrylic pressure-sensitive tape

can be coated on the corona treated surface of BOPP and PVC, and then dried, rolled and cut into various tape products. It can also be coated into cloth glue and paper tape on the non coated cloth surface of paper and cloth. In order to prevent anti sticking, LDPE should be coated on the non coated surface of cloth and paper, and silicone release agent should be coated on LDPE to prevent the adhesive from anti sticking on the back

73. How about the performance and application of various adhesive tapes

answer: the characteristics of electrical and mechanical tapes are shown in Table 4. The growth rate of industrial added value of raw materials in 2014 was 8.3%-102, and the performance of new kraft paper tapes is shown in Table 4

table characteristics of electrical and mechanical tapes

such a large load range achieved with the help of interchangeable loading components. Substrate heat resistance range thickness/mm adhesion/(n/10mm) breakdown voltage/kv tensile strength/(n/10mm) Elongation/% paper

cotton

polyvinyl acetate

PVC

Pet

silicone rubber

polyimide

polytetrafluoroethylene y ~ a

y ~ a

y ~ a

y ~ a

b

H

H 0.15

0.22

0.22

0.2

0.05

0.3

0.05

0.08 3.5 ~ 5

2 ~ 3.5

4 ~ 5

4 ~ 5

1.5

2.5

2.8 1 ~ 1.5

1 ~ 2.5

3 ~ 3.5

10

5.5 ~ 6

12

but with a strong and continuous fire source, it can still burn rapidly and cause a fire 6 ~ 7

10 60 ~ 65

60 ~ 100

60 ~ 65

3.5 ~ 5

45 ~ 50

35 ~ 40

20 ~ 30

30 ~ 35 3

7

20

200

80

400

40

150 note: heat resistance range: Y-90 ℃, a-105 ℃, B-130 ℃, h-180 ℃

table performance of new kraft paper tape

project new kraft paper tape * * * adhesion of original kraft paper tape/(g/10mm)

overlapping adhesion

peel strength after overlapping bonding*/（ × N/25mm)

non smoothness: sliding start angle

ink writing

expandability: back peel strength**/（ × N/20mm)

aging resistance

cold resistance 500

very good

610

22 degrees

good

500

good

350

bad

20

9 degrees

bad

80

bad

bad note: * determination method of peel strength after overlapping bonding: 3.2kg roller, one-time reciprocating pressing, 34h later, the peel speed is 0.5m/min, 180 ° peel strength, 20 ℃ temperature** Back peel strength measurement method: 180 ° peel, peel speed 10m/min, except for specific requirements for control mode, temperature 20 ℃*** New kraft paper tape is a new type of back coating stripper without silicone stripper developed by yamayo guoce pulp Co., Ltd. and Chuangyan Chemical Co., Ltd. in Japan. It is cheap, high strength and excellent waterproof

kraft paper tape is the most used in packaging, accounting for 40% of the total tape output. Japan produced 400million M2 kraft paper tape in 1987, while the total tape production was 900million m2. It is easy to unfold, easy to paste, can be torn by hand, and has appropriate strength. It is used for sealing corrugated boxes and calcium plastic corrugated boxes. Its structure is (external) stripping agent silicone/primer LDPE/kraft paper/pressure-sensitive adhesive (natural rubber or SIS pressure-sensitive adhesive). In the United States, due to strict environmental protection control, hot-melt pressure-sensitive adhesives have greatly replaced various solvent-based pressure-sensitive adhesives. The most commonly used are sis and SBS hot-melt pressure-sensitive adhesives, which are solvent-free and can be sprayed on the substrate after melting to form adhesive tapes. The equipment used is simple, the investment is small, and there is no environmental pollution problem. SIS is styrene isoprene styrene hot melt adhesive, and SBS is styrene butadiene styrene hot melt pressure sensitive adhesive

table performance and type of domestic tape

type width/mm length/m peel strength/

(n/25mm) thickness/mm application of BOPP tape 50

25 45, 50, 60

45, 50, 60 ≥ 7

≥ 7 0.04 ~ 0.055

0.04 ~ 0.055 kraft paper for general carton packaging 50

25 45, 50

45, 50 ≥ 7

≥ 7 0.04 ~ 0.05 0.055

0.04 ~ 0.055 versatility, low impact strength, for large and small carton packaging